turbo choices: which is the best for my application?

[CHAOS]

well ive lately been doing research on "bigger" turbos.... and ive widdled it down to three... the FPgreen, the Helix RR500, and the rotated gt30r kit. now... the green have been proven to be a decent turbo across the board... hence why its a safe choice... the rr500 is relatively new and seems to actually be a slightly better/ more responsive turbo than the green. and then theres the beast known as the rotated 30r... i read up on the RR500 and was slightly impressed... but overall power just didnt seem to be there... im shooting for roughly 400-450 to the wheels, and it just seems as tho the rr500 isnt going to get me there... im not sure of the spool for the 30r... i dont think id mind a bit more lag than stock but not much more... what are your thoughts on this topic?

[TROLL]

well, i've read a bit about the 30r on the 2.5L and i think its the ultimate street setup. spool is totally acceptable IMO on the 257 and it packs a punch when you're in your powerband. i honestly dont know much about the green or the helix turbo yet but i will read up on it.
i wouldnt aim any higher than 400 whp on a stock block though unless you would be able to handle a possible block rebuild in your future due to the hypercast pistons though. do you have a second car? you might be fine for forever, but as always, more power = more potential problems.

[CHAOS]

im looking into pistons/rebuild... im considering having the engine pulled when im ready to paint then towing the body to the shop... we'll see tho...

[TROLL]

whew, pricey pricey. pistons would be the first thing and if you're looking into it the fastest/easiest thing thats still about the same price might be to buy a new 257 block with forged pistons already installed... i think they are about $2100, but of course since its assembled you'll be cutting out cost of pistons, labor, and downtime.

[sisforsurfing]

I'm not going to pretend I have any experience with any of these turbos (like most people don't), but from what I've always read...

The FPGreen has been around for a while and has an awesome reputation with DSMs. I've read people really preferring them with an external wastegate (I think you planned on doing that anyway), and the 3 inch inlet is something to look at. Spool is less than stock, but still pretty good.

I agree with Bryan about the 30R though... newer turbo, really good spool, lots of power potential. I think it's a better call, unless you really want a bolt-on turbo. Rotated seems to be the way to go.

With either 400-450 wheel is going to be a feat, but possible. If I were you I'd get an externally gated GT30R and one map for low boost 93 oct., one for high boost 93 oct., and a C16 map. The GT30R with C16 should definitely get you 400+ wheel and solidly in the 11's.

I'd talk to someone with personal experience... I know someone on here has a built STi with a rotated setup.

[TROLL]

oh and IMO you should not do a turbo with a 3" inlet in the stock location. total bitch to install and the 3" inlet isnt able to really be 3" becaus of how it runs under the intake manifold. and its a total bitch to install, if i didnt say that already.
bryan
p.s. total bitch to install.

[Renegade_]

I have heard good things on both the green and the 30r

I have seen people use the green to a lot of success as it provides a better punch than stock without sacrificing significant spool time

The 30r though is what I would go for though, better flow over the FP Green although the spool is a bit later - but in all honesty, if you are going to do things like highway pulls you are going to be up in the RPMs anyway which would make the spool time minimal. You will know you have a larger turbo on the car as there will be some lag, but not to the point where you will be like "ok, when is this bugger going to kick in?"

[D Money]

Hi.

Rotated 30r.

Thank you.

[CHAOS]

where would i get a stock forged 257 bryan?

[D Money]

No where because they don't come forged.

Buy cp pistons and build your existing block since assembled short blocks are giving you a ej257 block anyway. If you don't wanna do that buy the cobb stage 1 block or gruppe-s race 2.5L and sell yours as a stock ej257 sti shortblock to make some money back.

[TROLL]

yeah you could have your stock block rebuilt with forged pistons or you could get a gruppe-s or other companies stage 1 or stage 2 shortblocks which should be assembled shortblocks but include some basic upgrades like forged pistons, etc.
this will increase your overall costs quite a bit and complicate things overall, so i'm not sure if its necessary or not, but i guess it all depends on what your goals are.

[D Money]

I think he is asking which would be more efficient.

I am going to say buy the built 2.5L and sell your existing one to someone with a wrx. I am sure you can get atleast $1,200-1,500 for your block and low milage. Those blocks that are totally built aren't expensive. They range between $2,100-2,600 shipped!

[TROLL]

if you're really looking to step it up this isnt a bad way to go... although its kinda funny to be posting about this here...

http://forums.nasioc.com/forums/show...ght=shortblock

[D Money]

Originally Posted by TROLL

if you're really looking to step it up this isnt a bad way to go... although its kinda funny to be posting about this here...

http://forums.nasioc.com/forums/show...ght=shortblock

That's your boy Troll!

[TROLL]

na i didnt, guess its gone? i'm not really in the loop on all of that...

[wgknestrick]

Just spend the extra money and get a .82AR GT30R rotated setup.

Yes, they are a little more difficult to install.
Yes, you will have a much better powerband all around vs a stock location turbo
Yes, your car will be about 10x easier to work on once it is installed.

A 30R will make about 360-400whp on 93oct on any realistic (reading accurate) dyno.

Don't believe all the 400whp is easy bull**** that people push. The only people that say that are the ones that haven't even swapped turbos yet. Yeah, it's easy to read about people making 400whp, now try it for yourself.

I went thru 2 aftermarket "stock" location turbos before I wised up. They just suck when compared to a true rotated GT turbo. Inlet size really matters too.

BTW I pulled my engine this spring and didn't even have to remove my turbo or wastgate. Rotated FTW.

[D Money]

Originally Posted by wgknestrick

A 30R will make about 360-400whp on 93oct on any realistic (reading accurate) dyno.

Don't believe all the 400whp is easy bull**** that people push. The only people that say that are the ones that haven't even swapped turbos yet. Yeah, it's easy to read about people making 400whp, now try it for yourself.

I dunno about that one. I have seen plenty of people do over 400whp on fp-greens, sz49's, etc. They all got tuned on the same dyno were a stock sti puts down roughly 240whp. I would imagine a rotated gt30r would be close to 450whp on pump with the proper supporting mods.

[wgknestrick]

Originally Posted by subwrxkid

I dunno about that one. I have seen plenty of people do over 400whp on fp-greens, sz49's, etc. They all got tuned on the same dyno were a stock sti puts down roughly 240whp. I would imagine a rotated gt30r would be close to 450whp on pump with the proper supporting mods.

And these are the same cars that only trap 112 in the 1/4 mile. They just don't have "that kind" of power. You just can't make that kind of power on pump gas and have it last. The greens and such aren't that big. 450whp isn't happening without heads/cams or meth inj and big boost. This is "any day", "any dyno", "any pull", 450whp I talk about. Not the uncorrected, 40deg ambient, 100oct, dynojet/ dyno dynamics, #s that half of the people post under the "pump gas" heading.

On a side note: Phil Grabow put his time attack car on a Mustang dyno after he tuned mine. He had methanol inj, 75lb/min compressor, built engine with stock heads/cams, etc. He only pulled 422whp and his car has about 200+ hrs of tuning on it.

Don't believe everything you read. People inflate everything these days.

[TROLL]

wowza, what block was he running for that? built 257?

[D Money]

I don't wanna argue wit you but the cars trapped 120+, both are my friends and tuned at the same place. Leave it at that, ok?