TD Boost Error help 2.0DIT - Subaru WRX Forum
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post #1 of 4 Old 11-25-2016, 08:11 PM Thread Starter
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TD Boost Error help 2.0DIT

2015 wrx and accessport
I installed a Cobb intake and box. Reflashed ECU with appropriate stage 1+ BigSF 91 oct.

After reading COBB website it says at wide open throttle, TD Boost Error should be within -1/+1 over or under target at WOT.

I seem to hit this properly at wot.

Is TD Boost error gauge accurate at partial throttle??

My high/low readings can hit -17.0 to 11.....at half throttle, under different rpms, which would indicate 17 psi over Boost and 10psi under Boost at around 75% throttle, spirited driving.

Air Fuel ratio guage is happy 14.7 to a safe rich 11.

Knock never exceeds -1.4 on the high/low parameter save spot of the gauge...and always reads 0.00

Looking at stock Boost graphs. I know the wrx has an eradic Boost line on a graph..I know I eventually want a EBCS and tune to smooth it out...

Am I in danger? Are my readings normal? Low wastegate map maybe?

Thanks so much
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post #2 of 4 Old 11-25-2016, 09:43 PM
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Boost error during part throttle can be pretty wild, because it's the difference between target boost and manifold pressure... which means if you just started spooling up it can be high. I'm sure the reverse (positive boost error) can happen pretty easily to when you rapidly change how you're driving at part throttle.

I wouldn't worry about it.
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post #3 of 4 Old 11-25-2016, 09:59 PM Thread Starter
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Quote:
Originally Posted by Ruso View Post
Boost error during part throttle can be pretty wild, because it's the difference between target boost and manifold pressure... which means if you just started spooling up it can be high. I'm sure the reverse (positive boost error) can happen pretty easily to when you rapidly change how you're driving at part throttle.

I wouldn't worry about it.


That's what I kinda thought. And when looking at a stock Boost map, the beginning is nuts....hence why a Grimmspeed EBCS or like..can help smoooth out Boost curvature on the graph..

Dang tho, thanks man that's a bit of a relief. I had flash backs of high school of anything I modified broke pretty quick lol




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post #4 of 4 Old 11-25-2016, 10:46 PM
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Keep an eye out for underboost and overboost or boost spikes (but after the turbo has a chance to spool up) during WOT, the rest will be ok .
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