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Old 09-17-2007, 11:23 AM   #1
Ultimate Racing
Former Vendor
Member#: 101728
Join Date: Nov 2005
Location: Toronto Ontario
2002 Impreza WRX

Cool Ultimate Racing GT42R "low boost"

Hey guys,

This passed weekend we completed some "low boost" runs on our good friend and co-worker Sal's WRX. He is running our prototype GT42R turbo kit. Here are the specs on it:

- 2002 WRX
- 2.5L Built Bottom End
- WRX Heads w/ JUN 272 Cams, and Cam Gears (aggressively tuned)
- Ultimate Racing Prototype GT42R Turbo Kit
- Reversed Intake Manifold
- Ultimate Racing FMIC
- Ultimate Racing 1260cc Fuel Injectors and Rails
- Ultimate Racing Surge Tank Fuel System
- STI 6spd
- Sunoco 94 + Meth Injection

We had installed a 3psi spring into the wastegate to obtain a low boost load row so that we could easily apply boost compensation. Wastegate spring maxed out at 25psi and we could not get any more out of it. Far too difficult to change the spring out of the boiling hot wastegate on the dyno so we called it quits for the day. We'll be changing out the spring another time and hopefully throw some serious boost at the GT42R. With 25psi right now we're really only tickling the GT42R.

Notice it's pulling past 8500rpm and still carrying power? I believe that run I had actually spun it to 8700rpm but the dyno isn't showing that. With a 2000rpm power band that averages 600+whp it's a beast on the street.

**UPDATE (Engine Bay Pics)**

Sorry for the dirty engine bay, but I wanted to get some pics out, so you can have a look.

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Last edited by Ultimate Racing; 09-20-2007 at 09:40 PM.
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