My friend has himself an 06' STi. Topspeed has done some work on it already but he wants to make 400hp at the wheels. The one thing where we are both left guessing a little is what turbo to go with. Anyone making that much horsepower and happy with their turbo choice? The supporting mods are pretty easy to sort out but the turbo choice is where he needs some info.
a blouch dom3 will get there,but if you're going to do it may as well go full monty and gt35 it. as the seagull says...no one complaines for more after doing a 35
FYI, I was in your situation and got talked into going rotated. It cost me around $6k + tune (not including if you need install prices), then three weeks later the motor blew costing me another $6k, plus supporting mods such as clutch and injectors. Needless to say, I've topped the $15k mark in mods this year, all because I wanted 400whp. However, it's worth it :dirty:
Bah, my rotated setup was cheaper and still havent blown the motor. I dont beat on my car that much though. There is no reason to go any other route imho
^^^ yeah, but didn't you already have the supporting mods like the FMIC, injectors, fuel pump, etc? I was going from stock, so I had to buy all the pieces as well. Still, definitely worth it
Yeah, I got an ebay FMIC $300, Injectors for $400, Pump for $100, Cat back $500, Budget Rotated Setup $2750, Tune $500. It really doesnt make much sense to even bother with a stock location setup. 420whp with the cheapest rotated turbo you can get and an ebay fmic.
You can go rotated much cheaper but I was just throwing up retail pricing. I have seen rotated kits on nasioc for under $2k.
So we're about the same...I went Perrin FMIC, AVC-R, AOS and stainless lines. Take those out and we're about equal. BTW OP, I'm using the Precision 5862, Integroid's using a T3/T4s (I think) and about to up it to a Precision 6262. Mike Sargeant (sp) is using some BW turbos capable of this (the S200 and S300 series), Matt Ball is using the Precision turbos. A GT30 will get you close, a GT35 will get you there. Add meth (like Coolrex) and it's a different party.
Yeah I'm doing meth injection on my Tial GT35r with Tial Vband .63 housing. I think it's gonna SHINE!
ask scott. he only stopped cuz of the tranny. i could be wrong but i think that was only at 18lbs, capable of 22lbs on that. oh and thats a hybrid block.... no AVCS, but higher compression. mildly ported heads, so... i would say its doable, and yes meth would almost assure you of it
iirc, Sean said screw the tranny and see what it does. He was already planning on going 6-speed anyway. Could be wrong, but I don't think I've ever seen a 20g hit 400 on pump.
^^^Ditto...I have never seen a 20G hit 400whp on pump. If you have a stock STi and planning on doing everything at one time, it is almost silly to go any other route. Going rotated could cost you less than a stock location turbo.
well he wanted to stop at 350, but scott got 370 and the fuel was good so they stopped. but i do remember there still being a lot more room. almost 100% that it was 18lbs with capabilities up to 22lbs... think, he could still have potentially added external gate, meth, and race gas.....
add all of that and a cost of a 20g and you have a cheap rotated setup and some money left over for tuning.
yeah i was right it was 18.6lbs. just found it on his journal thread on 4touge. just saying it COULD be done if you wanted to.... and yeah true. $$$ does add up to almost a cheap rotated kit... to each their own. stock location or rotated?? i'd do rotated if i had the money personally.....
we said on pump...meth and race gas is a different story. I don't think an EWG is going to net 30whp, especially on a 20g. I thought all the EWG did was help modulate / hold boost better? Moral of the story - go big or go home. Rotated or bust...
yep. but there is a pretty nice performance gain to be had also. compared the size of a wastegate dump tube to the turbo's own internal gate. you get a hefty VE increase
There was a 20g Sti tuned by Topspeed at our dyno day with meth that hit 417 at 2x psi of boost (I want to say like 25-26 psi). He said it was within 1 hp of what it read at Topspeed. Now you throw that car on a dynapack and it will read over 400 with no meth Don't chase a number too hard. External gate will add volumetric efficiency (the VE that Nicad spoke of) that will also increase hp and torque. People have seen 20-30 hp gains on the stock wrx turbo with external gate. As for 400 lasting, I think it can be done reasonably. Sonny (upsidedowndesi) has 380 hp on his car with 93 octane with our S256 rotated kit. We stopped at around 20 psi on his car and it was very conservatively tuned. His car is a BLAST to drive as many can attribute to that have gone for a ride. His is on a stock bottom end and wrx cams. We have two more of our kits going on a Sti's here shortly so we will see what it makes on better cams. One will be a basically stock Sti with our kit and a front mount. By the time you sell off stock parts, going rotated is not THAT much more and it definitely opens up lots of power potential. I know with our kits we can swap the turbo and go from a 400 whp turbo to a 800 whp turbo in a matter of a few minutes, so upgrading later is also a possibility if you want more. Of course doing something that radical WILL require different injectors/fueling needs, etc, but you can always get a head start on that as well by going with the new Bosch 1000cc injectors. You can bump up the fuel pressure and be good for 1600cc with 1000cc injectors, so they are good for 400 all the way to probably 600 whp if not more. Moral of the story, it is better to get something that is capable of more than what you are shooting for right now. That way if you want more, you already have a lot of the components to get you there rather than wasting money on something you may or may not be satisfied with later and then have to spend money all over again.
still trying to decide on tranny options. on one pull it did 382 at 19lbs. could it pull the other 18hp at 22lbs. don't know? we will have to wait and see when i have a spare tranny sitting around. and yes go rotated.
We can always build you a 5 speed that will hold. We built one for a guy not too long ago that is being beat upon with a rotated set up on a daily basis and holding up just fine. The cost of the gears is in between the RA and the PPG at around $2500 with cryo treating. Add another $400+ a oem overhaul gasket set ($200 maybe) and you have a transmission that can hold quite a bit of power. So for around $3k you have a built tranny if you bring it to us to built. Add a bit more if we have to pull the transmission. PPG I think is around $3700 just for the gears.
Yeah was just talking about that. Very good deal...exchange rates must be favorable right now, lol. Andy actually liked the Mfactory gears better when he installed them. But the ratios are close ratio, not for everyone. Sorry, end thread jack now
The man has spoken lol. If money allows, a Tial 3076r would be prefect. I will say it again, skip all the stock location non-sense and go to a rotated 30r, you will be happier. Now if you are dead set on a 20g setup, i can sell you my superziller 49 turbo along with the EWG kit that's good for 370whp on pump
Thought this might be interesting. Saw this graph of a 2.5 hybrid (I know not the EXACT same animal) on Nasioc Link to thread
Here is a comparison of a 20g on a 2.5 motor with AVCS vs a S256 (our rotated kit...think 30R sized for the most part) on a 2.5 hybrid with stock wrx cams. Both on 93 pump gas, both at about the same level of boost. The 20g was at 21 I believe and the rotated was at 20. The advantage that the rotated kit has is you can seriously turn it up (to around 30-35 psi if your motor can handle it) and it will keep making power. While it does make power a bit later (500 rpms or so) once the power comes on it continues to make more power all the way to redline in every gear. These runs were done on the same dyno but the rotated kit was done in 101 degree weather vs 85 degree for the 20g. So the difference would probably be even more pronounced if both were done on the same day. The other thing is the AVCS will quicken spool by about 300-500 rpms. So once we get some data on a car with AVCS and better cams the spool could be quite similar and the hp will most likely hold all the way to redline.