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 Old 06-13-2018, 04:30 PM   #1
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Default Stage 2 OTS Tune, Not Hitting Boost Target?

Hey all, my first post I think.

First off here is a mod list:

Stock upper downpipe
3" test pipe
3" straight pipe
Corksport HPFP Internals
Corksport Stage 2 SRI

I know this gets a lot of questions already, but mine seems a bit different. I'm not dropping to like 13 PSI or anything. Just hear me out.

Previously I had just the straight pipe and test pipe with a Stage 1 OTS tune. It would peak at about 18.4 PSI when FFS, car hauled ass. This past weekend I installed the Corksport intake and HPFP internals, and I proceeded to flash a Stage 2 OTS tune, all I edited in the map was the MAF calibration (yes I used the Corksport SRI tables), and re-setup my LC and FFS RPMs. Flashed it, car runs great, doesn't seem to be any issues, EXCEPT now the highest boost I've seen is 17.6 PSI, only momentarily hitting that pressure when FFS. Otherwise at WOT at around 4K RPM it sits at 15.5-16 PSI.

Cobb states that the peak boost target is about 18 PSI tapering down to 17 PSI at 6K RPM, with the OTS Stage 2 tune. I'm not hitting that, and I don't know why. My AFRs look good, HPFP actual pressure is great (hits just over 2000 PSI, not sure if that is a problem), etc.

I'm just not sure what it is, can't be a boost leak considering I haven't touched anything on the charge side, only thing I did was an intake and HPFP.

Let me know if you want data logs, I'll have to go get some but I'm interested to see what people think it might be first.


Also, I have a Stratified tune coming in a couple days or so, as soon as I flash that onto the ECU I'll also have a look if it does the same thing or not.

Last edited by achulz; 06-13-2018 at 04:30 PM. Reason: MSF Database - Automerged Doublepost
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