HELP - Datalog Stage2+ shows throttle closure and LPFP under 50...

[nje82]

Looking for feedback on my first 3rd gear datalog on my 2009 135i manual, Stage2+ full bolt on 93 octane. Running JBR/MHD BEF. slot 5 (autotune), still in learning mode as its a new flash.
i am new to this platform but a few things jump out..

AFRs.. down to 11.7.. seems tad rich no?
Target boost vs. actual boost. big discrepancy here.. Target 16.5 actual 21.5..
Lpfp dropped to 49psi
Getting throttle closure

https://datazap.me/u/yarink1980/135i...8&zoom=368-465
Any feedback would be super helpful! My plan is to go custom tune, but first want to make sure there arent any mechanical issues i need to sort out. I ordered a Fuel-It stage 2 bucketed kit as well, to future proof fueling needs. My target is under 525rwhp.

[drwillb]

Is this the same car that blows smoke out the tailpipes after warming up?

Why are you doing WOT pulls and talking about tuning?

Fix it before you run it hard.

[nje82]

Originally Posted by drwillb

Is this the same car that blows smoke out the tailpipes after warming up?

Why are you doing WOT pulls and talking about tuning?

Fix it before you run it hard.

I confirmed the issue is extremely infrequent. After replacing the valve cover, gasket and PCV there was zero smoke for a week after multiple heat cycles. Car doesn't smoke under boost, only in one extremely specific scenario and twice since I purchased it a few weeks ago. I'm going to assume its the turbo seals and i plan on replacing the turbos in the next few months. In the interim i'd like to run a stable/conservative tune on the car and make sure there are no other issues. thanks

[drwillb]

Originally Posted by nje82

I confirmed the issue is extremely infrequent. After replacing the valve cover, gasket and PCV there was zero smoke for a week after multiple heat cycles. Car doesn't smoke under boost, only in one extremely specific scenario and twice since I purchased it a few weeks ago. I'm going to assume its the turbo seals and i plan on replacing the turbos in the next few months. In the interim i'd like to run a stable/conservative tune on the car and make sure there are no other issues. thanks

Good to hear.

BTW, where are you located? I work in Ridgewood and live in Wanque.

[nje82]

Originally Posted by drwillb

Good to hear.

BTW, where are you located? I work in Ridgewood and live in Wanque.

Livingston. have you autocrossed at metlife? check out www.motorsportsne.com hopefully ill be at the next few events..

[drwillb]

Originally Posted by nje82

Livingston. have you autocrossed at metlife? check out www.motorsportsne.com hopefully ill be at the next few events..

I used to track a fair amount with my e30 M3. Never done autox but it does look fun. Would definitely be easier on the budget.

Let me know if you need help with your car. I've got the ISTA software and plenty of tools. Just did the VVT eccentric shaft a couple of months ago.

[iminhell1]

Well, you have ZERO boost control. Get a handle on that before you do anything. As it sits now you don't know what kind of boost it's making. 21.5 is sensor max. So when you see that number, it's probably above it.
To hit that, odds are a wastegate is stuck closed. And yes, one stuck closed and one working will overboost.
Vacuum gun and verify that both gates move. Also make sure they hold vacuum. Should be no bleed down at all.

You could have one dead solenoid. I've not seen that the DME knows if one is dead or not, which I find odd. Good rule of thumb is to just start with new ones IMO.

[nje82]

Originally Posted by iminhell1

Well, you have ZERO boost control. Get a handle on that before you do anything. As it sits now you don't know what kind of boost it's making. 21.5 is sensor max. So when you see that number, it's probably above it.
To hit that, odds are a wastegate is stuck closed. And yes, one stuck closed and one working will overboost.
Vacuum gun and verify that both gates move. Also make sure they hold vacuum. Should be no bleed down at all.

You could have one dead solenoid. I've not seen that the DME knows if one is dead or not, which I find odd. Good rule of thumb is to just start with new ones IMO.

PROBLEM SOLVED!
so to close the loop on this issue.. I put up my old valve cover for sale. The guy who came builds N54 cars and has also had bad experiences with JB4. To make matters worse all of a sudden I was getting bogus oil temp and boost values no doubt from the JB4 which was causing bucking and loss of power. I followed his advice and ripped out the JB4 and went with MHD only (stage 2+ wedge OTS tune). my overboosting and throttle closure issues were solved instantly. regarding LPFP i ordered the bucketed stage 2 fuel it pump to take care of that.. latest datalog: https://datazap.me/u/yarink1980/135i...5iSCb2K3zEQze4