Z Car Garage and my APS ST Dyno Graph

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Sep 2, 2006 | 10:30 PM

#21

Bullitproof

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From: Wilmington De

Yeah, some young guy came in to their shop with the aps st already installed. they had the aps exhaust chopped up by a nj muffler shop. the welds looked really nice.

Sep 2, 2006 | 11:07 PM

#22

JoeDirtPharmD

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From: Phoenix

Quote:

Originally Posted by tig488

Joe, I can make mine hit 15 right now, you probably can too, but even 12 is useless with my 19s with KDWs. i doubt youre gonna be able to get more out of this turbo. a friend of mine that builds turbos doesnt feel the turbos exhaust housing is big enough for this motor, he claims its too small and the exhaust gases are causing too much pressure to flow well. he actually hates it. hes got my spare turbo and is looking at either changing the hot side all together, or putting on a different compressor wheel. he also does some custom stuff with the exhaust turbine vanes to make it perform better. we'll see.

Without any limitation from the EBC, I hit 16.4 - 16.6 psi, which ends up dropping to 8.5psi on a load-based dyno/10 psi on the road (top end of 4th gear). I was hoping someone already had a workaround to be at ~12psi at redline - at least my turbo is 'in the norm'. Dunno why I care, anyways; car runs exceptionally well, so I suppose I should be happy with where she's currently at...

Sep 3, 2006 | 05:00 AM

#23

USED

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From: NorCal

Quote:

Originally Posted by tig488

good, since you did it on a dynapack, you should have some boost logs, post em up.

im confused on the exhaust you used, do you mean you chopped up the APS 3" to make it fit the reverse Y?

I'll post up the dyno log tuesday (monday=holiday=no where near the shop

)

The car has the APS dual 3" exhaust with a custom 3.5" to 3" reverse y-pipe fabbed out of the 3.5" outlet pipe and the piping of the 3" dual before the first set of flanges. We thought it was overkill, but seems to do the trick.

We've always prefered 3" singe exhaust on the ST setup. Maybe it's just not enough flow.

Last edited by USED; Sep 3, 2006 at 05:04 AM.

Sep 3, 2006 | 08:20 AM

#24

tig488

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From: bama

Joe, i agree, it seems that no matter how high you turn up the ebc, it still drops to the same number. its gotta be an exhaust housing restriction. since it does it without an exhaust.

Sep 3, 2006 | 08:49 AM

#25

leeboyNY

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From: Korea & SF

I have a custom 3" dual exhaust and my boost drop is very small like 0.5psi. I usually get 11psi to 10.5psi. In fact, when I go WOT on 6th gear I peak at 13psi... I have zeitronix. I'll datalog this soon and post it.