So Bryan was able to fix the issues with the boost in gears 2-6 by working his magic, and the car runs MUCH better now. The car runs perfectly in gears 2-6.

We ran into an interesting problem with 1st gear though. When he datalogged the car, it turns out that the ECU was cutting my throttle body position to 40% even though the pedal was floored. The cut in throttle position coincided with the boost drop. I didn't have this issue with the stock solenoid, so the current thought is the turbo is spooling too fast and making too much power and the TCU is going into a 'protection mode'. We tried turning off the traction control, but it didn't make a difference.

Anybody else have this issue? Anybody know how to solve it? I may just HAVE to get a bigger turbo with more lag so this won't happen in 1st gear. ;-)

Joe

 

probably boost correction might help to solve the issue or lower boost settings for the low gears.

just my 2 cents. glad to hear prob solved.

 

it's not boost correction. We tried turning it off completely and it still acted the same. Something (TCU?) is preventing early spool and full boost in 1st gear by cutting back throttle body position. This is ONLY in 1st gear.

 

yeh I just sent Bryan some more maps to test out regarding this

*hopefully* it fixes the issue

 

I remember ECUTek had a map for the 09/10 EvoX SST models specific for 1st gear load or power control. It said something like it needs to be adjusted to raise the power limit on 1st gear or something like that.

 

yeh the ECU has the capability (and in fact some stock ROM's have lower boost in 1st)

but this isnt that problem.

you can actually see the Throttle being reduced, even though the Accelerator Pedal is @WOT...

so hopefully the maps I found/sent to Bryan will help here...

 

good to know. I'll wait to hear from Bryan. Thanks tephra! What do you think the solution/issue is?

 

I do not get it, why are people having such problems holding boost on MR's? The MR's I have tuned I have been able to work out the boost fall off no problem.

I just did a MR with 400+ HP with no boost fade or RPM draw back.

I think it would be more helpfull to everyone if someone would step up and say what they did you fix this, instead of just.

Its fixed.


Soooooooooo what was done?

 

You are talking about something completely different

- Bryan

 

I am talking about this Bryan

 

The problem is 1st gear, since nobody really dynos/logs a vehicle in 1st gear not too many people notice the problem.

I believe Bryan tuned 2nd thru 6th by the normal method of adjusting wgdc and engine target load tables.

 

Thank you, thats what I was looking for. I do not get much of that when tuning, but have seen and heard about it. So I was trying to figure out the solution to the cause to compare to my tuning method.

Thanks again.

 

Grab a MR that is tuned making decent power on the stock turbo with a boost solenoid that uses less then 100% WGDC and go WOT from 2k or lower in 1st gear.

Won't do it at higher RPM in 1st and it won't do it in any other gears.

- Bryan

 

Log:



- Bryan

 

did those maps help Bryan? or are you waiting for the car to come back?