JMSMotorsport

Is it possible to have a quick limiter. So pull the cruise get it into boosts and it just bounces off a limiter at say 4000rpm. I’ve got it to do it but it’s very slow to rev back up.

Lower Comp? Forged Pistons? What have you pushed a stock bottom end to?

Cheers, well that makes that my next tuning purchase.

Oh awesome. Wasn’t sure how many I could set to high priority. Learning something every time I post on here. I’m guessing this is just a lag in data?

I think I just answered my own question looking at this again as the MAP decreases as does my TP, but Fuel still says driver demand and the TP count is high enough to be in the .86 range? or is it in a transition between Decel and Normal?

The pictures tell the story, but RPM limiter is at 6000rpm and Fuel Cut is 6200rpm. If you look at the screen shots at this point on the dyno i was asking .86 across the top but as the rpm gets towards the limiter desired starts going lean .9 - 1.10, but the actual is fine. Why does the desired start going away from what's in the fuel base table?

Puffwagon - If you don't mind sharing when your running that sort of timing on 98 what Lambda are you targeting? Also how do you like the tunernerd knock monitor been looking at this to add to my Knock Box ears..

Desired boost shows 10 as wanted but don’t get any DC, copied the DC table to Tune1 Base and it worked, swapped back to Tune2 and it also worked. Very odd.

Bit of an update, swapped the factory solenoid for a 3 port MAC after doing the wd40 service and powering it up I noticed some leakage and what looked like air bubbles where the plastic port meets the body. Looks like it has a hairline crack at this point. Boost control now works with much less DC. Have found a funny issue thou when I go to Tune2 via CC the desired boost is shown on the log but I don’t get any DC? Swap to Tune3 and DC shows on logger.

Not sure if you seen my initial problem but the wastegate DC control is all over the shop, inconsistent. Roland believes this is because I’m asking to much of the solenoid at the high DC required to achieve the higher boost levels from a 10psi gate pressure. Wouldn’t adding pre-load increase my base wastegate pressure allowing less DC therefore giving me back some more control?

Yep understand how they work, but on a single port internal gate there isn’t another option to a 3 port? Can I add some pre-load to the wastegate to increase my base boost pressure?

Ok so would need to go to an external gate and a 4 port. Simply swapping from the factory solenoid to a 3 port MAC valve won’t give me any benefits? I’m guessing not as they are basically the same thing.

So moving to a 3/4 Port MAC Valve like what’s Independent Motorsports sells? Customer was looking at this so will get him to pull the trigger on one.

Makes 10psi on gate. With duty set to 0

Modified turbo and flapper.

Am I on the right track with my thinking. Set PID gains to Zero - alter the Wastgate DC table until I get desired boost then turn the PID control on and set my Desired Table? As I’m having an issue trying to dial the DC table in aiming for 18-20psi with a 3584R Turbo. One moment if I commanded .88 at 3500 it would shoot over the target so reduced to .75 and was well under so crept it up trying to meet target ended up past the initial .88 and up to .93 where it over shot again. I’m leaning towards a sticky solenoid? Or am I doing something wrong.

I’ve also noticed the knock events seem to move around in the rpm, so I’m starting to think it may be false knock as I can’t hear anything through my knock ears but I’m only just getting used to using them and distinguishing the knock noise from the background noise.

Knock Retard Logging - Am I right in thinking that logging SPKAD_IND_AVG is the amount of spark retard the PCM is Pulling? - So at RPM2400 - LOAD .93 SPKAD is -1.18 using Borderline Spark Table (As Seen in Screenshot) So to correct this knock event I would take 1-1.5 degrees from this part of the Borderline Spark Table?

Any update on the the Logger Stage 2?

I’m curious, in the BA pcm it only has the slope tables for IMRC Open and on the BF it has these plus another BF specific one. At what point is the IMRC open table used on the BF? This is the same between Turbo and Non Turbo?

Factory 4 bar Reg - Brand New, 044 Style Pump- Haven’t checked actual fuel pressure at idle. Would expect a brand new Reg to give me 4 bar.

Replied before I seen this. You mean NB sensor. The car does have a large dump pipe, I will confirm it’s forced OL

yes so trimming to stoich wouldn’t be .7-.8 Lambda as I’m getting - Idle commanded is 1 once warm so stoich. Two different widebands - one on the dyno and another AEM Standalone unit that’s plugged into the laptop. I will check data merged correctly and check again. I gather there isn’t any idle tables that control fueling VE other then the Slope Table?

I shall confirm tomorrow. 4 Bar Reg, copied all data from a Factory turbo tune. Will check again that everything copied over correctly.

Sure have, if I hadn’t wouldn’t it be trimming back to commanded?