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Old 03-19-2007, 01:44 PM   #1
Ultimate Racing
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Cool Ultimate Racing GT40R Dyno Results Part 1 *With Video*

Hey guys,

Over the past however many months, we've been working quietly on a pretty nifty setup. Many of you are familiar with our GT40R kits available. Both Twin Scroll, and our production-based Single Scroll. Unless you've been living in a cave for the past couple of years you're more than likely familiar with the performance our Twin Scroll GT4088R setup has given Big Valley's STi. But, what about the production-based Single Scroll kit? We've gotten countless emails asking about spool-up time, and dyno numbers. We've only been able to make assumptions up until now.

Here is an 04 STi that we have been working on for the past while.



It's taken a long time simply because we were working on it on, and off. Keep in mind, these results may not be what EVERYONE is looking for. The majority of the turbo kits we offer are usually first introduced with dyno charts (and/or videos) featuring a stock engine. This is not the case with this one. This STi features a built bottom end, with very impressive headwork. It's not that this setup won't work with a stock engine, we just didn't want to waste time with one as we want big power, and don't care to do things twice.

Here's a brief mod list:

04 STi

Engine
- 2.5L
- Forged Pistons (8.8:1)
- Forged Rods
- Ductile Iron Sleeves
- ARP Head Studs
- 272/272 Camshafts
- Adjustable Cam Gears (No more AVCS)
- Springs/Ti Retainers/ Valves
- Ported Heads
- Upgraded Oil Pump

Turbo, etc
- Ultimate Racing GT4088R Single Scroll Turbo Kit (0.81 A/R)
- Ultimate Racing Custom 3.5" Exhaust
- Ultimate Racing FMIC w/ TiAL BOV
- Ultimate Racing 1000cc Top Feed Injectors and Fuel Rail Setup
- Walbro 255lph Intank Pump
- GT Spec Ver 2 Headers
- Reversed Intake Manifold
- Larger Throttle Body with Throttle Cable and Pedal Assy (No more DBW)
- AEM EMS Standalone (Running Speed Density)

These are pretty much the essentials. There's probably more I'm missing, but these are what come to mind at the moment.

Now onto the results.



Boost was held @ 15psi. It will remain this way until we upgrade the fuel system. Please keep in mind that this setup was originally intended for drag racing.

We first dyno'd the car with cam gears zero'd. This gave us the good results. Power output, and spool were loosely similar to what we see with GT35R 1.06 setups that run about 19-20psi. So this is great news considering we're only running 15psi.

Then came the annoying part. Dialing in the cam gears. We began tuning the cam gears for an optimal drag racing setup. This took many dyno pulls but the results were fantastic. How about a Subaru powerband that carries to 8000rpm and ACTUALLY MAKES POWER? A rare sight to see. Of course, with the gain in top end, we lost a bit down low. This being a drag race setup, we really didn't care.

When we get some more spare time, we'll be upgrading the fuel system to one of our surge tank setups, and larger injectors. I expect to see big numbers. This turbo really hasn't even come close to waking up yet at only 15psi.

So that's all for Part 1.

Questions? Comments? Flames?

Darryl
www.ultimate-racing.com
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Last edited by Ultimate Racing; 03-20-2007 at 09:45 PM.
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Old 03-19-2007, 01:48 PM   #2
Gfunk720
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Looks nice... Cant wait to see some 20+ psi action
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Old 03-19-2007, 01:50 PM   #3
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450whp at 15psi.. that's nothing to sneeze at So- the only difference between those two graphs is adjusting the cam gears and re-tuning? No changes in boost?
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Old 03-19-2007, 01:51 PM   #4
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Quote:
Originally Posted by remowgn View Post
450whp at 15psi.. that's nothing to sneeze at So- the only difference between those two graphs is adjusting the cam gears and re-tuning? No changes in boost?
Correct. No changes in boost whatsoever. I'm pretty bored of it at 15psi to be honest. Can't wait for more boost.

Darryl
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Old 03-19-2007, 01:53 PM   #5
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now I'm really anxious to get my 9500 rpm S372 set up done...
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Old 03-19-2007, 01:55 PM   #6
SloRice
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Any chance of changing to the GT4094R as it seems to have quite a bit better compressor map.

p.s. nice numbers for 15PSI.
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Old 03-19-2007, 01:59 PM   #7
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Very nice, its gonna be a monster
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Old 03-19-2007, 01:59 PM   #8
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I can't wait to see it at 40psi.

Nice work guys.

Tray M
www.topspeedsales.com
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Old 03-19-2007, 02:29 PM   #9
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Nice work!!!

Any pic's of the uppipe and 3.5" exhaust?
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Old 03-19-2007, 02:41 PM   #10
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nice numbers can't wait to see what it can really do. also it is interesting to see the results of the cam gears since no one really uses them on subys.
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Old 03-19-2007, 03:08 PM   #11
Ultimate Racing
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Quote:
Originally Posted by nxttruck2002 View Post
Nice work!!!

Any pic's of the uppipe and 3.5" exhaust?
Same ones on our website:

http://www.ultimate-racing.com/Produ...TurboKit.shtml

Darryl
www.ultimate-racing.com
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Old 03-19-2007, 03:20 PM   #12
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looks like you guys are really on to something with the cam gears and headwork... i can only imagine with some boost! i think you're going to need a bigger graph.
hmmm 35psi before 5500 and a flat hp plateau till 8k.
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Old 03-19-2007, 03:20 PM   #13
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ULTAMITE RACING IS THE BEST!!! any questions?
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Old 03-19-2007, 04:33 PM   #14
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WHat size injectors do you think are required to run this setup at 30psi? I am looking to go with a 4088r or PT67R soon and was planning to only run rc1000cc injectors with a surge tank and a1000 pump.
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Old 03-19-2007, 04:36 PM   #15
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lol... when I first saw the power in the mid 400 range, I was thinking that something was off!

Then i saw the boost you were running for that power, and thought

Can you provide any details on that intake manifold setup that the car is running? Looks pretty nice
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Old 03-19-2007, 04:41 PM   #16
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Quote:
Originally Posted by dan avoN7 View Post
WHat size injectors do you think are required to run this setup at 30psi? I am looking to go with a 4088r or PT67R soon and was planning to only run rc1000cc injectors with a surge tank and a1000 pump.
BIG. These 1000cc's won't cut it.

Darryl
www.ultimate-racing.com
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Old 03-19-2007, 04:42 PM   #17
Ultimate Racing
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Quote:
Originally Posted by jigga View Post
lol... when I first saw the power in the mid 400 range, I was thinking that something was off!

Then i saw the boost you were running for that power, and thought

Can you provide any details on that intake manifold setup that the car is running? Looks pretty nice
Nothing special. Aside from it being reversed, we made a the plenum a touch larger, but that was really just to accept the larger throttle body flange.

Darryl
www.ultimate-racing.com
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Old 03-19-2007, 05:00 PM   #18
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thats a beast waiting to be awakened if you made those numbers on only 15 psi! nice work guys
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Old 03-19-2007, 05:23 PM   #19
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weak sauce , throw in some race gas and turn up teh boooost!!! haha, congrats!
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Old 03-19-2007, 05:59 PM   #20
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You know your making alot of hp if 4 x 1000cc injectors is not nearly enough fuel. lol
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Old 03-19-2007, 06:01 PM   #21
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Awesome work! Makes me want to do head work extremely bad now. Thats key in subarus I am learning.
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Old 03-19-2007, 06:38 PM   #22
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Impressive as always. You guys have the best turbo kits out there. No other company has proven their products time and time again like you guys. Keep up the good work!! Hope to see some track times soon.

-Matt
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Old 03-19-2007, 06:56 PM   #23
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Quote:
Originally Posted by Ultimate Racing View Post
BIG. These 1000cc's won't cut it.

Darryl
www.ultimate-racing.com
What is your fuel pressure set at? What i'm trying to gather is if it was mainly out of fuel because you are running just one single 255 pump or if it was mostly the injector just couldn't flow enough. just seeing if i can get away with 1,000cc injectors if i have enough pump (aeromotive a1000) and up the pressure a tad. going to 1,200cc+ from 1,000cc injectors nearly doubles the cost on them.
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Old 03-19-2007, 07:00 PM   #24
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my question Darryl,

that sheet shows full boost around 6300rpm.....im planning on getting to 40r turbo kit in the next two weeks.....before i saw your post i thought it was fully spooled at 5500rpm?....or am i just dreaming in hitting full boost that early....my set up is very similar to this one except for the sleeves and i have dual walbro set up with the 1000cc...its going in the the shop the first week of may, so i just want to make sure im getting the right turbo for my needs
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Old 03-19-2007, 10:08 PM   #25
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^^^i think you're reading the chart incorrectly... looks to me like he's got full boost (of 15psi) right before 5krpms. 30+psi is a different story, maybe 5500, but that's a guess.
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