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4 Speed BTR Gear Changes


DanStraffa
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Hello has anyone fiddled with the 4 speed BTR. 

Can you set when you want the gear changes in drive or performance mode?

I’ve changed the diff gears in my car over a year ago, from the 3.45 to 4.11 gears.

Before in Drive it use to change into 4th at 60 now I have to be doing 68-70 for it to change.

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I have changed my daily Ute from the 3.23 m78 open to the 3.73 m86 LSD diff.

In PCMTECH i adjusted (2 from memory) settings that had the diff ratio. However the change from 1-2 will hit redline before changing on full throttle. I understand the falcon does gear changes based on wheel speed not RPM. I also noticed while locked in 3rd towing it wont lock the converter anymore.

I have been pretty lazy with it, but i was going to find a ba turbo strat and compare the gearbox information, as they are standard with that diff.

Ill follow this thread and see how you go with yours, keen to hear what works for you.

 

 

Edited by BeerTurbo
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16 hours ago, DanStraffa said:

Haven’t tried changing anything yet, I’m still new at this.

Short answer is yes you should be able to configure all of those items.

Long answer is there are lots of different parameters to change. I would start by comparing a late model Turbo BA to a stock auto NA BA and see what Ford did from the factory. Then start by changing one thing at a time, make notes of what you changed and what the results were and keep iterating until you get the result you want. Make sure you only change one thing at a time, otherwise you can go in circles.

Check the common strategy thread for a list of strategies you can try.

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  • 5 weeks later...
On 11/21/2018 at 7:59 PM, DanStraffa said:

Hello has anyone fiddled with the 4 speed BTR. 

Can you set when you want the gear changes in drive or performance mode?

I’ve changed the diff gears in my car over a year ago, from the 3.45 to 4.11 gears.

Before in Drive it use to change into 4th at 60 now I have to be doing 68-70 for it to change.

Yep, I'm tuning the BTR in my 2007 SY Territory which I've just installed a built FG turbo engine into. Diff ratio has been changed from 3.73 to 3.23.

You need to change the axle ratio in the axle table, however this won't automatically correct the gear changes. In the shift/lock schedule you also need to scale the transmission shift points. You'll need to reduce the table by ~ 0.85 and see test drive to see.

A word of advice. The performance shift table is not the performance shift table. Try adjusting either of the Shift Schedule Towing/Towing Cruise Mode tables to adjust the transmission when in SSS mode.

Did you know the PCM for the BTR can also allow the engine to make the 'farting' noise during gearshift?

Having reviewed a lot of A4 tunes from various places it's no wonder the BTR transmissions had such a high failure rate. Their programming was completely wrong.

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  • 1 month later...

Background, changed diff ratio from 3.23 to 3.73. I have already updated the axel ratio fields.

So ive spend some time today playing with the shift schedule table. i would love to know whats the axis mean, i assume the far left is throttle?

anyway, i banged in the shift schedule from the car that came out with the diff ratio i changed to, the numbers were slight higher (stock 5200 ba turbo 5600).... the car still hit redline on change.

I changed all the shift schedules to the same table and then went about playing. I found when my max values were something like 4700, the car would change gears around 5700 rpm and no longer bash redline.

image.png.7898f2e5014d77a04074bd38209b374e.png 

 

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Here goes;

Column 0 - Throttle %

Column 1; 1-2 shift

Column 2; 2-3 shift

Column 3; 3-4 shift

Column 4; 4-3 shift

Column 5; 3-2 shift

Column 6; 2-1 shift

Column 7; TCC unlock 3rd

Column 8; TCC lock 3rd

Column 9; TCC unlock 4th

Column 10; TCC lock 4th

 

Shift Schedule Towing is Performance Mode.

The values are a multiplication of gear ratio, not engine RPM. 3rd gear is 1:1 which matches engine RPM. Allow several hundred RPM for shift event to occur, especially in lower gears or an engine which revs quick. 

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On 2/8/2019 at 7:02 PM, Romulus said:

Here goes;

Column 0 - Throttle %

Column 1; 1-2 shift

Column 2; 2-3 shift

Column 3; 3-4 shift

Column 4; 4-3 shift

Column 5; 3-2 shift

Column 6; 2-1 shift

Column 7; TCC unlock 3rd

Column 8; TCC lock 3rd

Column 9; TCC unlock 4th

Column 10; TCC lock 4th

 

Shift Schedule Towing is Performance Mode.

The values are a multiplication of gear ratio, not engine RPM. 3rd gear is 1:1 which matches engine RPM. Allow several hundred RPM for shift event to occur, especially in lower gears or an engine which revs quick. 

Hi Mate, cheers for that, if you were local to me id buy you a beer.

Been having some fun with the shift points today and im verry happy with the results.

your not wrong about the shift taking some time. my first gear shifts are now triggered at 4850 RPM and will tip the RPM gauge at 5800/5900 rpm. when i had them triggerd at 5k the would just touch the limiter....now they are smooth and the car accelerates perfectly..this is only a stock Na with 2.5inch exhaust and 3.7 rear gears.

my biggest complaint about the falcon was how quickly it loved to change into second, and given how long first gear is it really needed to stay in it more... ive left the bottom end of the shift points and moved the middle up and the top to a point where we dont hit redline and bloody hell the car feels so much better to drive now. its not sluggish or trying to do everything in second, it will hold 1st so you can do a start on a corner then accelerate out without going 1st-2nd then back to first.

verry happy with how its all going.

 

 

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  • 2 years later...
On 2/8/2019 at 10:02 PM, Romulus said:

The values are a multiplication of gear ratio, not engine RPM. 3rd gear is 1:1 which matches engine RPM. Allow several hundred RPM for shift event to occur, especially in lower gears or an engine which revs quick. 

hey mate sorry to bring up an old post, but how is the multiplication worked out? what is it multiplied by and with what?
Thanks in advance ☺️

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17 hours ago, JayJay said:

hey mate sorry to bring up an old post, but how is the multiplication worked out? what is it multiplied by and with what?
Thanks in advance ☺️

The multiplier is the transmission gear ratio. 3rd gear is 1:1 so the table = engine rpm.

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22 minutes ago, JayJay said:

stupid question, say if first gear is 2.743 to one, how do i calculate it out? 

is it 2.743 times xRPM ?

 

Looking at the table from BeerTurbo, column 1 @ 100% throttle, you would multiply 2170 x 1st gear ratio which gives you the calculated engine RPM for the gearshift.

 

2170 x 2.39 = 5186rpm. Hope that helps.

Gear ratios are:

1st - 2.39:1
2nd - 1.45:1
3rd - 1.00:1
4th - 0.68:1

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1 minute ago, Romulus said:

Looking at the table from BeerTurbo, column 1 @ 100% throttle, you would multiply 2170 x 1st gear ratio which gives you the calculated engine RPM for the gearshift.

 

2170 x 2.39 = 5186rpm. Hope that helps.

Gear ratios are:

1st - 2.39:1
2nd - 1.45:1
3rd - 1.00:1
4th - 0.68:1

it does, thank you very much 

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12 minutes ago, JayJay said:

it does, thank you very much 

its been forever since ive done BTR stuff, however with the ZF you can just use the unit converter in pcmtec to see the shift points, i presume will work for BTR files.

click utility, unit converter, go to speed up top, click load values from file. 

change the rpm around and it will show you the oss.

remembering a BTR will take a solid forever to change gears, so altho it may say 5k is your shift point it may change at 5800. The zf is similar, however from expense its more like 150 rpm or so of, zf changes much quicker. 

Edited by BeerTurbo
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  • 10 months later...
  • 1 month later...
On 8/1/2021 at 7:18 PM, JayJay said:

stupid question, say if first gear is 2.743 to one, how do i calculate it out? 

is it 2.743 times xRPM ?

 

So i did some research and found someone from HPtuners and found the user hiddeous had compiled a excel sheet for the ZF transmissions, i have edited it to suit the BTR gearboxes, Full credit goes to Hiddeous for making the file.

instructions are to fill in the yellow sections with the desired data, i suggest filling out desired shift speeds in KM/H then look at the engine RPM its shifting at then lower it to suit so your not redlining it then copy the final OSS table

Sorry if this isnt aloud admin, i was hoping it would be able to help others out

BTR Shift Tables v1.0.xlsx

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is there a horror story behind that one is there?

i've checked the data to an online speed calculator and they all seemed to line up if anyone finds any errors let me know and i'll try to correct them, but as mentioned in previous posts they dont shift at exact RPM's

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1 hour ago, dat111 said:

anybody know how to add more pressure into reverse?

 

Why do you want to add pressure in reverse? If the box is ok, it shouldn't be necessary.

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