HOWTO: Ghost Cam and VCT simplification

[Roland@pcmtec]

This is a guide to set up a ghost cam on a BF/FG. This involves understanding how the VCT system in the falcon works.

NOTE. This is NOT emissions compliant. This cannot be done on a road car, it must be for vehicles that are used on a racetrack or a powercruise event etc. This is the same as using aftermarket cam shafts. The unburnt fuel will not be cleaned up by the catalytic converter and you will be releasing high levels of carbon monoxide (NOx should be quite low as it is running rich, not lean). Do not leave your car idling in a shed with poor ventilation. E85 is much safer than Petrol however it is still not recommended to breath in the gasses.

Firstly the VCT works by the PCM calculating an intake camshaft position, it then adds the calculated overlap angle to this position to calculate the position of the exhaust cam.

Eg:

VCT_Intake_Cam = Calculated Intake position

VCT_Exhaust_Cam = VCT_Intake_Cam + Overlap_Angle.

Finally to confuse things the PCM then adds/subtracts from the intake and exhaust cam based on boost error. Note this in only in the FGs. This will not affect idle however it will affect your vehicles performance depending on how you have set up the boost control.

To achieve a ghost cam we need to understand how the overlap angle is calculated. 

There are 3 modes of VCT operation

cam source == 4 is Idle mode

cam source == 99 is VCT  Fault/Not Installed mode

Cam source == 3 is power/full throttle mode

cam source == 2 is part throttle mode.

Now in idle mode the camshaft overlap is capped by the same table that determines the intake camshaft position, so you cannot achieve any overlap, the best you can do is set both the intake and exhaust camshaft to 50 degrees which will give you some lump.

An easy solution to this problem is to force the PCM into cam source == 3 at all times. This means the main VCT tables are used at all times making tuning the vehicle much easier.

To force the camshaft to use the main maps at all times simply set these scalars out of range to -1000 rpm.

auF1079 (VCT Closed throttle disable RPM) set to -1000

auF1035 VCT Closed throttle enable RPM) set to -1000

Now to get a ghost cam the following tables need to be modified

auF0115 (BF/FG)

Maximum allowed overlap angle based on RPM and Oil Temp. Set the lower half of this table to 80 degrees

Now we can change the commanded overlap at idle via auF16492 (BF) auF0116 (FG)

Here you can see I have commanded 35 degrees of overlap at a TPS reading of 5, this means as soon as you touch the throttle the cam timing goes back to stock making car parks and low load no problem.

You also need to modify auF16503 (BF) auF0097 (FG) to have similar timing values in the low load/low tps cells. In this example I set 600 rpm to -30 deg to stop the vehicle from stalling, this will also increase the lope when the rpm drops low as the decreased overlap will kick the rpm back up again.

I changed auF0494 (BF) auF16487 (FG) (TPS) axis to 5 in the lowest cell, this means you keep the commanded overlap when hot/cold.

Finally I suggest increasing your idle rpm to 1000 rpm to avoid stalling. 

In the FG there is an overlap adder for speed density auF2260. You will need to put smaller values in the 30 and 60 degree overlap cells. This will clean up the idle fuel trims. BEWARE that some FGs command 30+ deg of overlap when coming onto boost, if you modify this table you may be modifying the WOT fueling as well. If you are using a multi-tune another way to clean up the idle AFRs is to simply add the slope of map table to the tune. auF2928 may be a more suitable table to use for the FGs as it also has an RPM component.

It is also recommended to disable LTFT when the ghost cam is active by adding this to your ghost cam tune. This will prevent closed loop fueling from maxing out adding fuel (auF0164)

Beware that if you command too much overlap you will foul your plugs and the car will misfire until they clean up. 35 degrees is quite a lot and I would only recommend this as gimmick not in a daily driven car.

Here is a video of what the above settings will sound like.

As you can see low speed reversing etc is not a problem.

Edit: This is possible to do on a BA if you use HAAT3VC or possibly HAAT2xx as these are the late model FPV BAs that had independent cam control.

Here is a procedure to upgrade a BA to use the F6 operating system

Edit 2: You can increase the lope quite dramatically by modifying this table (auF11706). This is the proportional gain of the idle spark feedback algorithm. By increasing it to 5000 it will toggle between min spark (-7) and max spark (MBT ~25 deg) causing even more lope. This table is only available in workshop edition. 

In the 5.0 Coyote v8s we have found the figures below tend to give quite a good result without even touching the cam timing. There can be a hesitation when transitioning from idle to throttle, so you may need to add timing to the low load main spark map to help the transition. In the 6 cylinders the numbers don't seem to affect drivability much so you can put silly figures like above without issue.

If you are using the multi tune to do ghost cam you can add the following table to the ghost cam tune to increase your idle rpm, this means the non ghost cam tunes can retain a completely stock idle rpm.

Here is an example of the required tables in a BF to add ghost cam to to tune 4 only if utilising the multi tune functionality.

Value files now available for FG and BF

 

[fordsrule]

i'm keen to try this but is there a possibility of doing damage?

thx, steve

[Roland@pcmtec]

If you have stock cams providing you don't you don't touch the tables such as "Expected position of cam hardstop" you will be fine. If you change these tables you run the risk of hitting the physical interlocks to stop the cams from causing valve piston interference.

If you run aftermarket cams and extend the overlap even further again (no one would do this) via the VCT system there is a possibility of valves making love to the pistons depending on the cam design.

The only other risk is fouling your plugs if you leave it idling lumpy for a long time without your air fuel/spark being correct. However that is no different to running actual cams

[fordsrule]

ok, i understand.

i drive in traffic quite a lot to and from work, do you think that fouling the plugs would be an issue with the ghost cam tune?

i have the FG mkii XR6 na.

cheers, Steve

 

[Roland@pcmtec]

Depends how much overlap you command and how much idling you do. Just tweak it until it drives how you want. Take your laptop with you, you can always adjust it.

[DarkHorse]

You can clean up your fueling by adjusting auF16657, Exhaust cam adder. Under speed density.

[fordsrule]

good info, thanks very much

[Roland@pcmtec]

Yes if you do this your trims will max out at idle. Fixing the various sd maps will be required as suggested above. 

[Carl]

Mate and I giving it a go 

[fordsrule]

wow!!! Lol

[fordsrule]

hi i must be missing something, probably knowledge lol

i can't locate any auf**** scalars.

i have searched for them but it doesn't find any of the ones mentioned

what should i be doing?

thx, steve

[Roland@pcmtec]

Send us an email with your file and the specific scalars you can't find, or if you are happy to share publicly you can post it here as an attachment.

[fordsrule]

1 hour ago, Roland@pcmtec said:

Send us an email with your file and the specific scalars you can't find, or if you are happy to share publicly you can post it here as an attachment.

actually it's the tables mentioned above that i can't find. Does it matter that the tune is a Herrod/Sct tune?

cheers

[Roland@pcmtec]

19 minutes ago, fordsrule said:

actually it's the tables mentioned above that i can't find. Does it matter that the tune is a Herrod/Sct tune?

cheers

Are you using the Pro version of the software?

[fordsrule]

1 minute ago, Roland@pcmtec said:

Are you using the Pro version of the software?

i'm using the workshop version sir

 

[Roland@pcmtec]

Is it a BF/FG XR6 Turbo? Do you have all the view levels enabled via View -> PCM -> Workshop etc?

[fordsrule]

1 hour ago, Roland@pcmtec said:

Is it a BF/FG XR6 Turbo? Do you have all the view levels enabled via View -> PCM -> Workshop etc?

it's an FG na

i'll look into the Views

thanks for your help

[Roland@pcmtec]

What strategy? it may have different parameter numbers in the NA.

[fordsrule]

23 minutes ago, Roland@pcmtec said:

What strategy? it may have different parameter numbers in the NA.

this is a shot of the screen, the strategy name isn't right?

 

[fordsrule]

3 minutes ago, fordsrule said:

this is a shot of the screen, the strategy name isn't right?

 

ok, it looks like there might have been a setting in the Views list that was stopping it, i can find the tables now

thankyou so much

[richardpalinkas]

On 8/3/2018 at 10:14 AM, Carl said:

Mate and I giving it a go 

what overlap did you have on the top video? sounds so good

[Carl]

We where playing around. I think it was about 30 to 35. 

[richardpalinkas]

Was mucking around with these settings, seems to give some lump but then it smoothes out, then comes back, then smoothes out etc. Is there other tables that should be fine tuned also?

[fordsrule]

On ‎8‎/‎6‎/‎2018 at 5:19 PM, fordsrule said:

ok, it looks like there might have been a setting in the Views list that was stopping it, i can find the tables now

thankyou so much

Hi, the image below is from my tune, as you can see it differs from the example you posted in your guide. My query is which line do I change to match your example as I have more lines?

Thanks, Steve

[Roland@pcmtec]

On 8/6/2018 at 4:49 PM, fordsrule said:

this is a shot of the screen, the strategy name isn't right?

That is because your car has been previously tuned with SCT. 

[fordsrule]

6 minutes ago, Roland@pcmtec said:

That is because your car has been previously tuned with SCT. 

That would be right, but can you help me with which lines do I change?

Your example says the last two, but mine are different

thanks

[Roland@pcmtec]

You can do whatever you want there. Experiment and see what works best. 

[fordsrule]

9 minutes ago, Roland@pcmtec said:

You can do whatever you want there. Experiment and see what works best. 

Oh, ok lol.

I'll give it a go then

[Loki]

On 8/25/2018 at 5:49 PM, Roland@pcmtec said:

You can do whatever you want there. Experiment and see what works best. 

I have no idea what to do with that table as mine had been tuned with SCT. It has more rows than what you showed from your BF table. Can you give me a little more details please?

Just want a little "tiny" rattle from ghost cam ? Very tiny bit

[Roland@pcmtec]

It is the TPS vs cam angle. So it depends what TPS angle you are seeing at idle as to what you need.

Eg if you set the low TPS cells to a high overlap but when you flick he AC on it the TPS increases it will drop you out of that cell. So you need to experiment and see.

[richardpalinkas]

Just touching base on this, has anyone fine tuned their ghost cam settings and willing to show what they have found works best for drivability too? Mine tends to want to drop idle rpm too much coming back into the overlap cells, even with idle speed set higher

[Roland@pcmtec]

What fuel trims are you getting at idle? 

[richardpalinkas]

I will double check in the morning.

 

Even with 35deg overlap, i barely get much lump, would running e85 have an effect on this? The effects were a lot more noticable on 98, on e85, same settings seems to just "stumble" rather than have a lump. Maybe the fuel trims are off

[richardpalinkas]

So i checked stft and they were at 1% with the stock overlap adder for fuel. 

Changed to the settings in the 1st post and its still at 1% but sounds better. 

[Roland@pcmtec]

What about LTFT they are the ones you care about. 

[richardpalinkas]

With stock cam adder values, around -10. Lowering the numbers for 35 and 60 degree overlap brings it down to about 8, but cant lower it further, and thats lowering them from 1 to 0.5

Edited November 6, 2018 by richardpalinkas

[richardpalinkas]

So adjusting auf16657 in the 30 degree, 550rpm to 1000rpm, should these values be increased or decreased to make it leaner?

[Roland@pcmtec]

Decreased.

[richardpalinkas]

On 7/31/2018 at 2:23 PM, Roland@pcmtec said:

 

Now in idle mode the camshaft overlap is capped by the same table that determines the intake camshaft position, so you cannot achieve any overlap, the best you can do is set both the intake and exhaust camshaft to 50 degrees which will give you some lump.

 

What tables/ scalers need to be changed to achieve this method?

[fordsrule]

Well finally got around to flashing the ghost tune, didn't blow anything up so that"s good lol

[richardpalinkas]

Got all the fueling sorted. Sounds good in park/ neutral but driving still has the issue of overshooting below idle rpm, sometimes stalling. Ive tried gradually reducing the cam angle so its not as sudden, which doesnt make too much difference. Is there more parameters that nees to be adjusted such as idle airflow or spark timing at idle to help it not overshoot? 

[Roland@pcmtec]

13 minutes ago, richardpalinkas said:

Got all the fueling sorted. Sounds good in park/ neutral but driving still has the issue of overshooting below idle rpm, sometimes stalling. Ive tried gradually reducing the cam angle so its not as sudden, which doesnt make too much difference. Is there more parameters that nees to be adjusted such as idle airflow or spark timing at idle to help it not overshoot? 

Definitely recommend setting the idle rpm higher and also more airflow at idle. If you raise the airflow to get the idle timing lower (eg 5 degrees ish) then you have more timing reserve to catch the fall. If you are already idling at 20 degrees the PCM can't respond quick enough to catch it. Timing cause the idle to jump almost immediately, more idle air has a small lag delay and can oscillate.

I also recommend leaving the oil temp table fairly standard, that way when the car is cold it won't have the lumpy idle.

[Roland@pcmtec]

On 11/25/2018 at 7:44 AM, fordsrule said:

Well finally got around to flashing the ghost tune, didn't blow anything up so that"s good lol

Sounds like it is misfiring. How much overlap is that?

[richardpalinkas]

Best to adjust auf0032 for idle airflow? As a ballpark, how much should these values be increased by?

[Roland@pcmtec]

It is dependent on too many things. Start small and experiment. 

[fordsrule]

1 hour ago, Roland@pcmtec said:

Sounds like it is misfiring. How much overlap is that?

As per auF2260, but i have read it again and you say to reduce the values there so there is no misfire, i will have to make that adjustment.

But the idle did change to more of a lump just after the end of that video

Cheers

 

[richardpalinkas]

Some testing for some ear candy. 45deg overlap sounds mint, but still cannot get the revs to drop nicely when coming to a stop in drive

[ebbarra]

Mine worked 

[abs351]

Hi Team,

New member to PCMTECH & tuning of such ECU's.

I took the time to read through the ghost cam scenrio, got to work, great..after the 1st run got over it, sounds good though..lol...one thing i didnt find as a scalar is auF2260 i dont seem to find this. Car is a 2013 FG XR6 MK2 turbo following strategy  HAEK4MF.HEX / BBMF

Is this missing on such stargey?

running PCMtech version 0.74.

regards

Abs

FG-MK2-XR6-TRBO-GhostCam&Overboost-16-12-18.tec

[Roland@pcmtec]

You need professional or workshop to see the cam overlap adders (auF2260). You can upgrade to professional for the difference in price (there is a product you can purchase online for the upgrade).

[abs351]

Perfect, thanks Roland That would now make sense why i cant locate it. I will shortly upgrade to pro or workshop. 

[Barra.AU]

auf2260 is available in bf na and turbo aswell, not just fg. im using the pro version.

[Avh1993]

Got these resurts on my ba xr6t auto 

[richardpalinkas]

Sounds good. What kind of settings did you use?

[Avh1993]

32 degrees 

[ebbarra]

Are you using a ba f6 tune for vct control in your turbo?

[Avh1993]

Yes with bf f6 tables for vct etc 

[Barra.AU]

Having trouble getting my ghost cam tune to work. I have a turbo barra 6spd manual au. Using a bf turbo ecu, HACCHJ5 strategy code, ASU-224 ecu. I have followed the how to guide to each step and it still wont do it. Attached are the scalars i have changed.

I also need to lean it out at idle. What tables do i adjust to achieve this?? My wideband is reading 10.8 to 11.5 at idle and low loads off boost, and the back pocket is feeling it a bit.

[richardpalinkas]

Auf0115 set the whole table to 80

[Roland@pcmtec]

You also need to modify these tables as they limit overlap as well.

auF16503 Angle to Overlap exhaust cam

auF16492 Maximum overlap allowed

auF0115 Maximum allowed Overlap Angle based on  RPM and Oil Temp

[Barra.AU]

What do i set auf16503 to??

[richardpalinkas]

Same as your max overlap, so 35 deg

 

[Barra.AU]

Just in the top row of cells??

[richardpalinkas]

Yea the same as your other table

[Barra.AU]

Same result. Still wont do It.

[richardpalinkas]

Auf16492 maybe try 35

[Roland@pcmtec]

Use some intuition. If you are just guessing and blindly plugging numbers in you won't ever get results. If it isn't working datalog why it isn't working.

[Roland@pcmtec]

Update

You can increase the lope quite dramatically by modifying this table. This is the proportional gain of the idle spark feedback algorithm. By increasing it to 5000 it will toggle between min spark (-7) and max spark (MBT ~25 deg) causing even more lope. 

You can also set 600 rpm to -30 deg overlap, this will stop the vehicle from stalling and cause even more lope when the rpm dip as the decreased overlap will kick the rpm back up again.

If you are using the multi tune to do ghost cam you can add the following table to the ghost cam tune to increase your idle rpm, this means the non ghost cam tunes can retain a completely stock idle rpm.

[Roland@pcmtec]

Here is a video showing how the spark oscillation sounds. 

[Turboidiot]

On 7/31/2018 at 2:23 PM, Roland@pcmtec said:

You also need to modify auF16503 and auF0115 to have similar timing values in the low load/low tps cells. In this example I set 600 rpm to -30 deg to stop the vehicle from stalling, this will also increase the lope when the rpm drops low as the decreased overlap will kick the rpm back up again.

Cant find these tables in HAEDLJ5. Are these workshop version only?

[Roland@pcmtec]

11 hours ago, Turboidiot said:

Cant find these tables in HAEDLJ5. Are these workshop version only?

They have different resolution tables in the FG so they have different IDs. It is described above.

[ECPT]

i can not find auF0115 for my FG MK1 ? using pro, please help 😂

[nat]

7 hours ago, ECPT said:

i can not find auF0115 for my FG MK1 ? using pro, please help 😂

I've got a MK1 and using Pro too and can see it; if you click View up the top and under PCM see if Professional is ticked there?

[ECPT]

i put the wrong one down 😅😅 i cant fine auF16503

[nat]

10 minutes ago, ECPT said:

i put the wrong one down 😅😅 i cant fine auF16503

Oh okay - for that one the FG has changed the ID of it: you're looking for auF0097 (VCT Exhaust Cam Overlap Angle)

[ECPT]

ok i got mine set up nice, but is there a was to have the zf6 auto not do anything in gear until after 1000 rpm? as the driveability is pretty crap now lol 

[nat]

I don’t know of any way for the ZF to do that, but personally I’ve never worked with those (as I’ve got the TR6060). Roland will have a better idea if anything, or if anyone else in the thread has worked with the FG autos and wishes to share their setup may help you.

My car has a bit of a drivability issue itself in the throttle hanging a lot on decel even though I only touched 3 tables (overlap tables) 😂 Might need to datalog load and commanded overlap etc

Edited September 27, 2019 by nat

[Roland@pcmtec]

What do you mean not do anything in gear? As in stop the ghost cam?

Just set 1000rpm to be normal cam timing and set 900rpm to be ghost cam. 

[Avh1993]

This is a video of mine in my ba xr6t 4 speed it cuts out sometimes but I played with it abit

[yoda598]

what file did you use for the ba btr? i was looking at ghost cams but i havent found a bf xr6t btr file to use.

[ECPT]

is this possible to do on an 04 BA xr6t ? 

[Avh1993]

I'll have a look when I get back from work what file I used off memory it was the bf file and mine is a 03 xr6t so won't see why it won't work on newer mate

[Roland@pcmtec]

2 hours ago, ECPT said:

is this possible to do on an 04 BA xr6t ? 

They are all the same so no problem if you use the late model strategy.

[ECPT]

ok im new to this haha im gonna be asking so stupid questions, but how do i use the late model strategy ? 😂 

 

[Roland@pcmtec]

If you have to ask I wouldn't recommend attempting it.

[TehNewbie]

Anyone got decent ghost cam results on E85 ? 

[Roland@pcmtec]

On 10/7/2019 at 7:10 PM, TehNewbie said:

Anyone got decent ghost cam results on E85 ? 

Fuel shouldn't make any difference.

[MuffinButton]

i know this is highly likely the wrong forum, but im learning to tune and been playing with my car, in fact I've been playing with cars for years, i have a Haltech barra pro plug in and im looking to do a ghost cam idle, can anyone help? would i be able to apply what I've learnt here to the haltech? 

[Roland@pcmtec]

17 minutes ago, MuffinButton said:

i know this is highly likely the wrong forum, but im learning to tune and been playing with my car, in fact I've been playing with cars for years, i have a Haltech barra pro plug in and im looking to do a ghost cam idle, can anyone help? would i be able to apply what I've learnt here to the haltech? 

https://lmgtfy.com/?q=haltech+support+phone+number&s=g

[TehNewbie]

On 7/8/2019 at 8:18 AM, Roland@pcmtec said:

Update

You can increase the lope quite dramatically by modifying this table. This is the proportional gain of the idle spark feedback algorithm. By increasing it to 5000 it will toggle between min spark (-7) and max spark (MBT ~25 deg) causing even more lope. 

 

You can also set 600 rpm to -30 deg overlap, this will stop the vehicle from stalling and cause even more lope when the rpm dip as the decreased overlap will kick the rpm back up again.

 

If you are using the multi tune to do ghost cam you can add the following table to the ghost cam tune to increase your idle rpm, this means the non ghost cam tunes can retain a completely stock idle rpm.

Is there a way to alter proportional gain on stock OS for idle? Tried searching for spark gain etc but couldn’t find anything. It must be right there but I’m blind. 

[richardpalinkas]

On 7/31/2018 at 1:53 PM, Roland@pcmtec said:

 

Now in idle mode the camshaft overlap is capped by the same table that determines the intake camshaft position, so you cannot achieve any overlap, the best you can do is set both the intake and exhaust camshaft to 50 degrees which will give you some lump.

 

What tables are you referring to in this comment?

[Roland@pcmtec]

11 hours ago, TehNewbie said:

Is there a way to alter proportional gain on stock OS for idle? Tried searching for spark gain etc but couldn’t find anything. It must be right there but I’m blind. 

It is a workshop parameter.

[Roland@pcmtec]

8 hours ago, richardpalinkas said:

What tables are you referring to in this comment?

Not sure what your question is but by default you need to set the camshaft closed enable/disable scalars to allow use of the main cam timing maps at idle.

[richardpalinkas]

11 hours ago, Roland@pcmtec said:

Not sure what your question is but by default you need to set the camshaft closed enable/disable scalars to allow use of the main cam timing maps at idle.

In the very first post, you said you can get some lump without forcing the cam into wot mode, but by setting both inlet and exhaust overlap to 50deg. Are these tables you refered to just the idle inlet and exhaust overlap settings? Just trying something different that's all

[Roland@pcmtec]

12 hours ago, richardpalinkas said:

In the very first post, you said you can get some lump without forcing the cam into wot mode, but by setting both inlet and exhaust overlap to 50deg. Are these tables you refered to just the idle inlet and exhaust overlap settings? Just trying something different that's all

Yes but it was quite a bit of work as there are about 10 other tables you need to access. It is much simpler to just set the closed enabled/disable scalars to -1000 and then set the main cam maps.

Then you can just modify the intake camshaft only. This is the same way you can get a mild ghost cam on a 5.0 which doesn't have overlap control.

[Roland@pcmtec]

Updated the main post to add these numbers which work quite well for a coyote 5.0 to give it a "ghost" cam without actually changing the cam timing. Cam timing can be modified for more affect but this gives it a mild lope. auF11706

[Roland@pcmtec]

Value files now available for BF and FG

 

[Gonads]

On 11/19/2019 at 5:21 PM, Roland@pcmtec said:

Updated the main post to add these numbers which work quite well for a coyote 5.0 to give it a "ghost" cam without actually changing the cam timing. Cam timing can be modified for more affect but this gives it a mild lope. auF11706

Hi Roland. I’m having trouble finding the auF11706 table on my FPV GS FG MK1 with HAFFAE3.hex PCM strategy. The file template level is professional.

[Roland@pcmtec]

It is only in Workshop level at this stage as we spent a fair bit of time researching to find and test it.

[Gonads]

On 12/14/2019 at 3:47 PM, Roland@pcmtec said:

It is only in Workshop level at this stage as we spent a fair bit of time researching to find and test it.

Hey Roland. Thanks for the speedy response. I’ve had a bit of a crack myself-I’m OK with altering my GS tune to the equivalent of a GT335 and I’ve got a waaaaay better traction control than the factory ever gave me. However, I’m certain there’s a lot more power/torque on offer with E85 and a set of tunes from an experienced workshop than I’m willing to push with my limited resources.

I think I’m best to have a chat to one of the workshops who have runs on the board with your software.

Cheers,

Ben