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Old 10-15-2010, 01:52 PM   #1
hot-j
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Default Help me get to 380-400 AWHP

Here is a list of mods on a current build in progress. USDM STi motor, looking for 380 to 400 whp, what else might I need? looking to run 18 psi but no more than 20psi.

Turbo still undecided ATP GT3071R or GT3076R?
Diverter valve still undecided, Tial QR maybe?
have the following;

Perrin cold air intake
Perrin 3' inlet pipe
Deachwerks 850cc injectors
Walboro 255 fuel pump
Invidia equal length headers wrapped
Cobb catted 3' turbo back exahust
Cosworth high flow 12mm oil pump
Moroso aluminum deep sump oil pan
Cosworth timing belt
Cosworth timing belt guide
Perrin boost solonoid
Okada project plasma direct coil packs
Okada project plasma direct boot sockets
perrin crank pulley
zero sports flywheel
carbonetic twin plate clutch

And thats all I have purchased so far.... What do you guys think my WHP will be? And what additional will get me to my goal? FMIC? Cams?
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Last edited by hot-j; 10-15-2010 at 09:59 PM.
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Old 10-15-2010, 02:22 PM   #2
wrxwhat
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Supra T / Stock G35

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You'll probably make 360 on 18psi with a 3076r
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Old 10-15-2010, 02:29 PM   #3
hot-j
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Hmmm... Do you know what the spoolup difference might be between the two?
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Old 10-15-2010, 02:32 PM   #4
wrxwhat
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Supra T / Stock G35

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between a 3071r and a 3076r ?? Probably negligible.. You should go rotated.
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Old 10-15-2010, 02:38 PM   #5
hot-j
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I would have to repurchase some of the current mods if I did...
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Old 10-15-2010, 09:55 PM   #6
hot-j
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Nobody on here has any other suggestions? Come on guys......
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Old 10-16-2010, 03:53 AM   #7
NSFW
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05 Stage Free LGT
ATP 3076, 6MT, AVO FMIC

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The 3076 might just touch 400 on a dynojet on pump gas. The 3071, more like 350.
...with a catless exhaust. Since you're catted, they'll be a little lower.

I have a 3076 and a catted exhaust and I'm very happy with it. I don't have dyno numbers yet though.
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Old 10-16-2010, 09:24 AM   #8
fourseasonsandles
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Quote:
Originally Posted by hot-j View Post
Nobody on here has any other suggestions? Come on guys......
No on has suggestions because this has been done hundreds of times. A simple search will yield results. My setup will be near 400whp on a 3076 when my wastegate is repaired and I was running 21.5psi. For the record I was making 388whp on EFI logics dyno with a malfunctioning IWG. Going to EWG and my torque should be back as well as a few more HP. I am also running cams though. Just the 3076 wont get you there unless you are on meth, E85 or race gas.

If you dont want to run a high psi, you are going to need a bigger turbo. Go to ATPs GT35
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Old 10-16-2010, 11:49 AM   #9
hot-j
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Both of you guys have the 76.... whats your spool like? And which cams are you running? I was going to go with the Cosworth s2 setup, but feel they are a little much for my setup. They used to make something smaller, but don't anymore.
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Old 10-17-2010, 03:53 AM   #10
NSFW
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ATP 3076, 6MT, AVO FMIC

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Stock cams, hits 22psi by 4000 RPM in 3rd gear.
It's pretty mellow below 3500, but above 4000 it's a lot of fun.

It took some time to adjust to the powerband being up higher like that (keep the RPM up, downshift more, etc), but I am really happy with it. If I build another Subaru, I might trade spool for more power, but I wouldn't sacrifice power to get to full boost sooner.
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Old 10-17-2010, 04:40 PM   #11
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NSFW thanks for your imput. This will be my daily driver, so drivability is a concern. Now if I can find someone with a 71r.........
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Old 10-17-2010, 08:01 PM   #12
xsblack
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3076 all day
The 3071 will leave you wanting more, especially with a catted exhaust and >20psi
I had a 3076 rotated set up with a .63 and loved it!!
Spool was never an issue, and 400whp on pump is attainable(with more then 20psi)
Do you have forged pistons?? would do that wayyy before cams for a 380whp goal
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Old 10-17-2010, 10:40 PM   #13
hot-j
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No pistons..... trying to save the stockers before hand. My 380-400 whp goal is based on what I would like in a reliable daily driver/what the stock innards can handle. I know I should do pistons to make it 100% reliable, but if I have to do that, I'd just buy a built long block and call it done. I cant afford to do that and all these mods at once. so mods first, and when it blows, built motor. Hopefully I can get a year or two out of it before that happens though.
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Old 10-18-2010, 12:19 AM   #14
sleepersaurusrex
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I would go with the 3076 for sure. I have a few friends running that turbo still rocking a TMIC they just have a meth kit. I would ABSOLUTELY recommend running a meth kit with your car, If you can get someone to tune it right the meth will not only add more hp to help you obtain your 400whp goal but it will help keep detonation at bay. Once you go to FMIC you add a bunch of weight to the front of the car and you lose about 500-1000rpm of boost depending on the intercooler and turbo. Also I would do whatever you can to cool down your engine bay temps. That will help keep heat soak to a minimum will keeping your car looking like a sleeper but you have 400whp under the hood. I would get exhaust wraps for your header and up pipe, and also wrap the hotside of your turbo and a ways down the downpipe. By doing that will reduce the heat in the engine bay dramatically. Thus improving your efficiency and your engine is happy lol. That turbo with a meth kit and supporting mods and a good tune should get you to your goal and be safe to drive hard and not risk your internals. I have seen people get the US STI motor to 500whp and run like that for a long time because of the tune quality. That is VERY important.
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Old 10-18-2010, 12:36 AM   #15
hot-j
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I was wondering when someone would suggest a Meth kit. I dont want to do that because its consumable, and though effective, in my opinion a band-aid for detonation. I am wrapping or coating, (haven't decided which yet) headers/up pipe (indivia), and hot side of turbo. A little additional to the dp makes sense too. I don't think I will get a FMIC. looking at a better top mount, but only looking for now. I do also need to figure out a radiator. The car is a 00 RS coupe, and I think the stock STi radiator won't fit right. Haven't gotten to that point yet. But an oil cooler is looking more and more like a must have. The GT3076R is getting lots of love..... Oh and BTW I live close to DSG, and could drive to ECS also for the tune. Haven't decided where yet to that either.
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Old 10-18-2010, 03:12 AM   #16
JesseL
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Should get a car that don't run on gas, that's a consumable too.
That reasoning is pretty lame, meth is a very good addition to almost every setup
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Old 10-18-2010, 04:03 AM   #17
hot-j
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I suppose I should add nitrous to my car too then, because it COULD get me there reliably with proper tuning also? Then I could have ZERO turbo lag......
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Old 10-18-2010, 11:39 AM   #18
JesseL
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No, Jato rockets onry.

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Old 10-18-2010, 11:54 AM   #19
Spooky_UK
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FYI, i would very much be looking at an in-tank bosch 044 if not a swirlpot arrangement using a bosch 044 as a delivery pump

Allowing 22% transmission loss, aiming for 500bhp at the fly on a walbro 255 is pushing it! At minimum i'd be going for an in-tank systec 290ltr.

Fuel lab or SX adjust able FPR would be needed too.
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Old 10-18-2010, 01:18 PM   #20
sleepersaurusrex
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Quote:
Originally Posted by hot-j View Post
I suppose I should add nitrous to my car too then, because it COULD get me there reliably with proper tuning also? Then I could have ZERO turbo lag......
Man I have worked with N20 on quite a few different cars and tuning is very picky with that. If you screw it up you are going to blow your motor. N20 is just as consumable as meth and costs more. I would get a meth kit LONG before I got N20. Yeah you will reduce your lag but you won't have ZERO lag with a turbo that big. There is something you have to consider, BIG turbo = Lag but BIG hp numbers. Small turbo = low lag and low hp numbers. So if you want to go fast you have to be willing to accept some lag even with N20 you will have some lag. If you go with a meth kit I would get nothing other than an AEM or Aquamist meth kit they are by far the best and you have fail safes on the system so if it fails your car is safe from blowing up. Seriously dude just stick with the meth it's easier and WAY safer since a 50/50 mix won't blow up should something happen and you wreck the car or something. N20 isn't as friendly!
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Old 10-18-2010, 01:39 PM   #21
wrxwhat
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So what happens when you get unequal dispersion of methanol into the cylinders?
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Old 10-18-2010, 02:30 PM   #22
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I would always opt for an in tank mix of 10-20%...
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Old 10-18-2010, 02:36 PM   #23
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Quote:
Originally Posted by wrxwhat View Post
So what happens when you get unequal dispersion of methanol into the cylinders?
Given the right ECU the ignition can be retarded per cylinder if the knock control is cyliner specific.
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Old 10-18-2010, 02:40 PM   #24
RealStreet
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A 3076R should get you there with some good gas. On pump gas, well, it depends on the dyno.
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Old 10-18-2010, 02:42 PM   #25
hot-j
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Yeah I was bieng sarcastic about the nitrous..... I run an 044 external in my "fast weekend" car. If I had know about the in tank one before I bought the walboro, I would have bought that instead. What about an intake manifold like the cosworth or magnus ones?
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