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Old 09-17-2007, 11:23 AM   #1
Ultimate Racing
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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
- AEM EMS
- 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.





Darryl
www.ultimate-racing.com
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Last edited by Ultimate Racing; 09-20-2007 at 09:40 PM.
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Old 09-17-2007, 11:26 AM   #2
wcbjr
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Wow.

"3" psi spring?
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Old 09-17-2007, 11:29 AM   #3
Ultimate Racing
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Quote:
Originally Posted by wcbjr View Post
Wow.

"3" psi spring?
That's right, but we were using AEM's boost control solenoid. At 70% duty, it wouldn't give us any more than 25psi. So we'll be changing that out in the near future.

Darryl
www.ultimate-racing.com
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Old 09-17-2007, 11:54 AM   #4
carnz-pj-410
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thats awesome for "low-boost" cant wait to see the high boost results!
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Old 09-17-2007, 12:08 PM   #5
wcbjr
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Quote:
Originally Posted by Ultimate Racing View Post
That's right, but we were using AEM's boost control solenoid.

That makes a bit more sense, nice project. I'm somewhat suprised to see the disparity between the HP and TQ numbers.
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Old 09-17-2007, 12:09 PM   #6
Mooneyes13
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lovely.
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Old 09-17-2007, 12:12 PM   #7
MrSmith
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Must be nice daily driving it making 620 wheel and filling up with pump gas at any ole Sunoco
Hows traction?
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Old 09-17-2007, 12:13 PM   #8
InfamousDX
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wow... 2 step and BAM... 10 second car [on frikkin 25psi on a 42R]. great job guys.
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Old 09-17-2007, 12:30 PM   #9
Token-Negro
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Single or divided inlet?
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Old 09-17-2007, 12:51 PM   #10
kcook
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um wow... 600whp+ on low boost and 8.5k+ rpm redline....

id love to drive that thing

-u guys need videos asap on the street
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Old 09-17-2007, 12:56 PM   #11
Ultimate Racing
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Thanks for the positive comments guys. We appreciate it. I'll do my best to get some videos.

The car is insane fast..I cant imagine what 40 psi would feel like :|


Cheers,

Sal and Team @ UR
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Old 09-17-2007, 01:07 PM   #12
kevinh211
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do you have any engine pics with that huge turbo?
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Old 09-17-2007, 01:25 PM   #13
djosrs
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Good numbers .... must be a wicked street car
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Old 09-17-2007, 01:28 PM   #14
p8baller07
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5.5k rpm is when it starts pulling thought huh, what will the car be used for? drag?
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Old 09-17-2007, 01:31 PM   #15
Ultimate Racing
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Quote:
Originally Posted by Token-Negro View Post
Single or divided inlet?
Undivided.

Darryl
www.ultimate-racing.com
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Old 09-17-2007, 01:31 PM   #16
Ultimate Racing
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Quote:
Originally Posted by kevinh211 View Post
do you have any engine pics with that huge turbo?
I personally don't. Sal may have some. I'll see what I can do about some pictures for you guys.

Darryl
ww.ultimate-racing.com
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Old 09-17-2007, 01:36 PM   #17
Ultimate Racing
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Quote:
Originally Posted by p8baller07 View Post
5.5k rpm is when it starts pulling thought huh, what will the car be used for? drag?
5.5k is when you start hearing Bill Paxton

Prior to cam gear tuning, we had quite a bit of power down low, but a sloping top end. Sal isn't what we call a "lag baby", and demanded all top end power so that's what we gave him.

Darryl
www.ultimate-racing.com

Last edited by Ultimate Racing; 09-17-2007 at 01:44 PM.
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Old 09-17-2007, 02:37 PM   #18
AZScoobie
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Sick guys.. Just sick..

CLark
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Old 09-17-2007, 02:40 PM   #19
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Quote:
Originally Posted by Ultimate Racing View Post
Sal isn't what we call a "lag baby"
Yup, Sal ran a GT35R on a EJ205 for quite awhile.....
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Old 09-17-2007, 02:53 PM   #20
Ultimate Racing
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Quote:
Originally Posted by AZScoobie View Post
Sick guys.. Just sick..

CLark
Thanks Clark!



Sal
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Old 09-17-2007, 03:02 PM   #21
SloRice
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Quote:
Originally Posted by Ultimate Racing View Post
5.5k is when you start hearing Bill Paxton
Great movie and very fitting sound bite!!
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Old 09-17-2007, 03:38 PM   #22
benya29
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are you guys going to dyno it with c16 when you fix the problems?
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Old 09-17-2007, 04:12 PM   #23
Subaloo
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Quote:
Originally Posted by Ultimate Racing View Post
5.5k is when you start hearing Bill Paxton


I want a ride! Would LOVE to see a suby pulling to 9k
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Old 09-17-2007, 04:52 PM   #24
XS_WRX
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engine bay pics + videos... or this thread is teh died....
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Old 09-17-2007, 05:58 PM   #25
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so what do you mean by the cam gears were "aggressively tuned"?
for aggressive top end or spool up?
-Micah
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