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.

http://www.ultimate-racing.com/sti/gt40r/GT40R-EngineBay.JPG

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.

http://www.ultimate-racing.com/sti/gt40r/sti-gt40r-dyno-sae.bmp

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

Looks nice... Cant wait to see some 20+ psi action

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? :eek: :eek: :eek:

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? :eek: :eek: :eek:

Correct. No changes in boost whatsoever. I'm pretty bored of it at 15psi to be honest. Can't wait for more boost.

Darryl
www.ultimate-racing.com

now I'm really anxious to get my 9500 rpm S372 set up done...

Any chance of changing to the GT4094R as it seems to have quite a bit better compressor map.

p.s. nice numbers for 15PSI. :)

Very nice, its gonna be a monster

I can't wait to see it at 40psi. ;)

Nice work guys.

Tray M
www.topspeedsales.com

Nice work!!!

Any pic's of the uppipe and 3.5" exhaust?

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.

Nice work!!!

Any pic's of the uppipe and 3.5" exhaust?

Same ones on our website:

http://www.ultimate-racing.com/Products2/STi/STi_GT40R_TurboKit.shtml

Darryl
www.ultimate-racing.com

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. :D
hmmm 35psi before 5500 and a flat hp plateau till 8k. :devil:

ULTAMITE RACING IS THE BEST!!! any questions?

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.

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 :eek:

Can you provide any details on that intake manifold setup that the car is running? Looks pretty nice :)

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

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 :eek:

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

thats a beast waiting to be awakened if you made those numbers on only 15 psi! nice work guys

weak sauce :lol: , throw in some race gas and turn up teh boooost!!! haha, congrats!

You know your making alot of hp if 4 x 1000cc injectors is not nearly enough fuel. lol

Awesome work! Makes me want to do head work extremely bad now. Thats key in subarus I am learning.

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

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.

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

^^^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.

bootyful, i love 40r's :) maybe one day i will get one

full torque at 5000 but not hp (full boost)

if its a turbo this big, dont even bother thinking of when its going to spool, lol.
This thing will spool like there in no tomorrow even after 8000 when 30+ psi or boost is pushing it.

full torque at 5000 but not hp (full boost)
what? :lol:

I wish this was my car. LOL
My guess is that by this summer there will be something bigger replacing that GT40R.

Good job UR

damn that looks good, can't wait to see it with the boost cranked up!

Great job guys... who made the cam gears you're using?

sweetness. That thing is going to be an animal at high boost.

What did y'all do with the brake proportioning valve?

impressive numbers on such low boost. cant wait to see what this monster can really do when the boost is turned up!

Whoa!!!!!!!!!!!!!! Unbelieveable.... Only 15psi and got to almost 450!!! How laggy is this huge turbo?

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

Full boost is actually had around 5000rpm. Not too shabby at all.

Here's a chart showing our progression during cam gear tuning (before revving out to 8000rpm). This run we logged boost:

http://www.ultimate-racing.com/sti/gt40r/sti-gt40r-dyno-gear-tuning.bmp

Darryl
www.ultimate-racing.com

Great job guys... who made the cam gears you're using?

These are JUN cam gears.

Darryl
www.ultimate-racing.com

You know your making alot of hp if 4 x 1000cc injectors is not nearly enough fuel. lol

I only said that these 1000's wouldn't be enough for 30psi. There's still room right now. We're at 73% duty cycle. Single Walbro 255lph.

Darryl
www.ultimate-racing.com

im in....niiiiice

wow 450 @ 15psi... sick

I only said that these 1000's wouldn't be enough for 30psi. There's still room right now. We're at 73% duty cycle. Single Walbro 255lph.

Darryl
www.ultimate-racing.com

How much bigger do you think you'll be able to go while still keeping an idle? Granted, it probably doesn't have a very low idle to begin with, but still... are you considering dual injectors?

:eek:

Subcribed for the ensuing madness once the boost is turned up!!

How much bigger do you think you'll be able to go while still keeping an idle? Granted, it probably doesn't have a very low idle to begin with, but still... are you considering dual injectors?

We've tuned 1600cc's and have idled them well. Gas mileage usually suffers heavily (even with stoich AFR's). More than likely we'll go with 1200's or 1600's.

Darryl
www.ultimate-racing.com

That would be really cool if you guys put up a video. :D :)

That would be really cool if you guys put up a video. :D :)

Customer of ours has one. I'm sure he'll post it when he has time. Mind you, we had nothing to do with the editing :o

Darryl
www.ultimate-racing.com

Customer of ours has one. I'm sure he'll post it when he has time. Mind you, we had nothing to do with the editing :o

Darryl
www.ultimate-racing.com

As long as it's not a street race against a veyron you'll be just fine. ;) :lol:

As long as it's not a street race against a veyron you'll be just fine. ;) :lol:

that just made my day

Hmmmmm i wonder what that would do on a H6 motor. I think Jeff Perrin already knows. Now i wish i knew.

How much would your twin scroll version improve the onset of full boost?

working on the link

working on the link

Pretty good video, dude. I just didn't understand why you were zooming into crap that was nothing...? :) Unless I was not seeing what you saw. :(

It worked. Why'd you take it down?

Darryl,

Thanks for showing that map......im so so impressed with your results....good luck with the set up...please post whenever!!!!!

Full boost is actually had around 5000rpm. Not too shabby at all.

Here's a chart showing our progression during cam gear tuning (before revving out to 8000rpm). This run we logged boost:

http://www.ultimate-racing.com/sti/gt40r/sti-gt40r-dyno-gear-tuning.bmp

Darryl
www.ultimate-racing.com

Here it is, my first video editing ever:

http://videos.streetfire.net/video/4dae3c10-3805-4dc5-8753-98f7016d9526.htm

Next one will be more exciting.


Rui

not badd at all lol

looks good soo far, but need to crank up that boost and unleash some power

great dyno vid.....jesus that turbo is loud only at 15psi

Wow, I love the EWG shooting out flames on the ground!! That's badass, hahaha :devil:

did you guys do the motor and heads or was that contracted out ?

I would love to try a 40R... but on a 2 liter, the lag would probably be unbearable... but, a twinscroll version... hmmm... :devil:

Congrats! 450 on pump is sweet... I HOPE I can get that much with a 35R on my 2 liter... Obviously I'll have to run more boost... but thats fine, me love boost ;)

def

did you guys do the motor and heads or was that contracted out ?

It was contracted locally.

Darryl
www.ultimate-racing.com

I am impressed with there products. Can't wait to have my car tuned next month. I will post up the results and hopefully a video as well.

Good job UR!!

what camera and program didu use for editing? the res came out pretty good.... and that car is amazing.... the sound wasnt that goood it sounded staticky idk if it was just me but sick car.

whens part 2?

what camera and program didu use for editing? the res came out pretty good.... and that car is amazing.... the sound wasnt that goood it sounded staticky idk if it was just me but sick car.

Camera - Sony HDRUX7 High Definition DVD Camcorder
Software - Pinnacle Studio Plus 9 HD
I can get much better picture out of it during the editing but files will be too big.

Thanks

Camera - Sony HDRUX7 High Definition DVD Camcorder
Software - Pinnacle Studio Plus 9 HD
I can get much better picture out of it during the editing but files will be too big.

Thanks
Have UR host it as a WMV file. :devil:

I am the proad owener of this beast. This is over a year project in the making. I have only driven the car for a couple weeks putting in 2 K kilometers with 2 pounds of boost. We only dyno'd the car last week. I will be driving for another 2 weeks with 15 psi before it goes back to the dyno so that we can wake up the turbo. Originally the car belonged to UR and the deal was that I'd purchase the car if they can use it for their projects. I do not mind because this is my fun car and I only drive it on the weekends. It can be frustrating, but sometimes being patient and waiting you can see and learn what others are doing. You can also see the kind of mistakes they fall into, so that you can correct them and not make the same ones plus improve in a lot of areas. A lot of frustration, patience and money does pay back at the end.
Special thanks to Ultimate Racing and my beautiful wife for being so patient.

Nice job there Saposat...car sounds insane! Looks like its going to be an absolute monster! Enjoy the car! Hopefully some day I can check it out!

And yes...

Ultimate Racing are the truth :)

I am the proad owener of this beast. This is over a year project in the making. I have only driven the car for a couple weeks putting in 2 K kilometers with 2 pounds of boost. We only dyno'd the car last week. I will be driving for another 2 weeks with 15 psi before it goes back to the dyno so that we can wake up the turbo. Originally the car belonged to UR and the deal was that I'd purchase the car if they can use it for their projects. I do not mind because this is my fun car and I only drive it on the weekends. It can be frustrating, but sometimes being patient and waiting you can see and learn what others are doing. You can also see the kind of mistakes they fall into, so that you can correct them and not make the same ones plus improve in a lot of areas. A lot of frustration, patience and money does pay back at the end.
Special thanks to Ultimate Racing and my beautiful wife for being so patient.

I didn't know that you had to break in the gt40r turbo, i would have thought the initial 1,000miles would have broken it in enough....im guess thats what UR told you to do?

I didn't know that you had to break in the gt40r turbo, i would have thought the initial 1,000miles would have broken it in enough....im guess thats what UR told you to do?

i think it was more the engine that he was breaking in and not so much the turbo :)

i think it was more the engine that he was breaking in and not so much the turbo :)


That is correct.

Thanks

Glad you're beginning to see results.

That thing is devastatingly loud at such low boost, I'm afraid to think what it'll to do to my eardrums when you crank it up! :eek:

Have UR host it as a WMV file. :devil:


:) :banana:

I'm running the same turbo with .95 A/R on my RB26DETT 240SX. The car is still in the build stage, but I'm eager to see your numbers on race gas.

^^^ yes, that's where this turbo/motor combo is going to come alive!!

i think it was more the engine that he was breaking in and not so much the turbo :)

its just in what he wrote that it seemed like he was doing it more for the turbo than the engine.....which i totally understand



BTW what intake filter is that?, i looked today at advanced auto and didn't see any k&n filters with 4 inch inlets that i could use

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?

wouldnt that have more to do with the fact that this test is single scroll whereas the other test was twin scroll?

wouldnt that have more to do with the fact that this test is single scroll whereas the other test was twin scroll?

Actually, both runs are with the same single scroll kit. Neither run was making full boost @ 6300 rpm. The difference in runs was simply in the cam gear adjustments. There's no AVCS on this car.

Darryl
www.ultimate-racing.com

^^^ yeah at first i just looked at it too quickly....this is such a sick set up, im just waiting for the 30psi numbers

Glad you're beginning to see results.

That thing is devastatingly loud at such low boost, I'm afraid to think what it'll to do to my eardrums when you crank it up! :eek:

I think the more boost you run, the quieter it will be correct? At only 15psi this gate is dumping a ton!

wow. nice work Darryl and Johnson. I'll be back to play eventually.

Rui- looks like the car is going to be fun. Thanks again for that O2 sensor way back when ;)

Darryl,

JUN's website says they only make adjustable cam gears for the EJ20K and EJ207 heads. What heads are on this car and can I use the cam gears on an EJ255?

wow. nice work Darryl and Johnson. I'll be back to play eventually.

Rui- looks like the car is going to be fun. Thanks again for that O2 sensor way back when ;)

N/P Eric you are very welcome.
Went out last night for some fun and all I can say is wow. The Higher you go on the RPM the more the car pulls( can wait for 30 PSI), sounds very loud just the way I like it, I was also impressed with the new Dog box.

Later bud

Went out last night for some fun and all I can say is wow. The Higher you go on the RPM the more the car pulls( can wait for 30 PSI), sounds very loud just the way I like it,

oooooohhh!!!..... all this info is makin me umm....envious and feeling rather slow.. :(

*sigh*

oooooohhh!!!..... all this info is makin me umm....envious and feeling rather slow.. :(

*sigh*
Tell me about it.....

I want more pictures and videos; even though the exterior is plain looking.

Is UR main customer base (the one's where they make all their money) Subaru owners? Just curious. :) :) :)

These are JUN cam gears.

Darryl
www.ultimate-racing.com

Expensive?

Expensive?
If I remember correctly, they used to be about $250 each

If I remember correctly, they used to be about $250 each

$220 each but they say on JUN's site that they're only made for EJ20K and EJ207s. Can anyone help me out here and let me know if they'd work on an EJ255?

Hey Darryl i sent you a pm about the set up on this car and possibly working ouot a deal, please pm me back when you get a chance

$220 each but they say on JUN's site that they're only made for EJ20K and EJ207s. Can anyone help me out here and let me know if they'd work on an EJ255?

The intake gears will work only if you are running non-AVCS cams - like this car. The exhaust cams will work on any DOHC EJ turbo motor (and maybe NA, not sure).

Any updates on this car?

Shockingly good m8

anything new with this/

I have been driving around a few times with 20 PSI. Car must be putting out more than 500 WHP. After having the taste of this UR GT40R there is now way that I am going back to other stuff.
Just too busy with life and other projects . There is a few changes to be done and I hope that we can pump a lot of boost before winter comes if not spring wil be around the corner

wowsers awesome job guys!

Wait im confused... You have a gt40r and a built engine and you didnt do any 20+ psi dyno pulls??? meh, use that gt40r power! Dyno that baby on c16!!! My bros civic hit 765whp with a gt40r (garrett) on c-16 race gas and running a 10.2 1/4mile

any updates??

What A/R are u using if u dont mind telling

UR has done it again... man that is a massive turbo for a 4 banger lol cant believe we are at this level with imports now! Cant wait to see what this thing can do when you really crank the boost up!

wish i had 40r sweat

Cool, I'd like to see this against my friends GT28RS Audi S4. He's also running low boost. Stock block, stock pistons, stock rods.

http://youtube.com/watch?v=3jWN_5emkhw
http://youtube.com/watch?v=x9dwRaF8kyE

Cool, I'd like to see this against my friends GT28RS Audi S4. He's also running low boost. Stock block, stock pistons, stock rods.

http://youtube.com/watch?v=3jWN_5emkhw
http://youtube.com/watch?v=x9dwRaF8kyE

:rolleyes:, this thread is about a GT40R STi, not stock STi's and SRT-4's.

^Yea! Stoner bashing time.

:rolleyes:, this thread is about a GT40R STi, not stock STi's and SRT-4's.

Okay? So I can't comment? Piss off.

Btw, that STI is putting down close to 400 awhp.

^okay? Point?

any race gas numbers yet??? Or even 20 psi pump gas numbers?

any race gas numbers yet??? Or even 20 psi pump gas numbers?


Soon once I have the time to take the car back to Ultimate Racing shop.

sounds good. Keep us posted.

:rolleyes:, this thread is about a GT40R STi, not stock STi's and SRT-4's.

Twin disco potato's are nothing to laugh at (unless you want your ass handed to you.) That combo has the potential to make well over 600whp at very low boost.

either way this discussion is about a built sti with a gt-40r and how it stacks up against similar setups with smaller turbo's, i.e. gt-35 or a fp-red or something similar.

I like the fact that this car makes some serious power all the way up to redline, however with only 15 psi running through this BUILT motor, there is room for waaaay more power, just take the skirt off and turn up the wick with some c-16!!!

This is the single scroll kit not the twin right?

yes, it is the single scroll kit with a 4088r.

Hmmm.....something doesn't add up. What turbo is this out of?

well.....i dont think it is stock on anything. It is a Garrett turbo. www.turbobygarrett.com will get you there.