flatter torque curve

[Nismo_Freak]

I'm calling bs without more details...9.5grand cutoff...there's more done to this motor.

I'm not posting specs, you'll just have to use your imagination.

I have not lied about one single thing.

It is your quest, and besides when have I ever posted BS info?

[spider_slayer]

i believe that turbodave's project car made pretty close to 500whp on stock cams. i forget what kinda turbo they were using, but i'm sure on a t67 500 is possiable with some very good tuning.

[Dori Dori]

i believe that turbodave's project car made pretty close to 500whp on stock cams. i forget what kinda turbo they were using, but i'm sure on a t67 500 is possiable with some very good tuning.

The cams aren't really all that's in question and at 15psi, you're not gonna make 500 unless you're revving it out like Nismofreak's dyno (which a stock valvetrain SR will not do from my experiences).

[Dori Dori]

The turbo used on the dyno I supplied was custom created by a Garrett Engineer and avid SE-R enthusiast who will remain unnamed. Special compressor housings and the whole deal...we'll call it the prototype of the disco potato Huge t28 is kind of an oxymoron when compariing it to overly sized turbos, but when compared to other t28's its gigantic.

As you can see in that thread you posted (coincidentally I posted in that thread a while back) the torque curve is flat, but talk about turbo LAG at 18 psi. YUCKY graph if you really ask me, especially when you can have equal peak power on a t28 based car, but 3x the response. It's easy to say that a properly setup FP Big T28 or a GT2871r would make damn near equal power, but make alot more power sooner. That thign doesn't make 300 ft lbs until 5500 RPM!!! Compare that to most high pressure t28 based turbos that are making it 1400-1800 RPM SOONER. IF you compare larger t28 based turbos to the one from Evans, you'll easilly see that ther are GOBS of more power available from properly matched turbos.

Cams will help that engine, but for the most part I'd rather opt for a MUCH smaller turbo. HOWEVER you do raise a good point about the housings not helping retain torque uptop, obviously I realized it didn't help, but maybe even moreso than the intake theories before.

As again above, it wa a specially made turbo

However I just found this online when surfing around:

(CarDomain page here: http://www.cardomain.com/ride/536500 )

FP Big t28 at 20-21 psi made 400 whp/323 footpounds. WOW!!! Nice dyno graph IMO for response and fun, and still retains 280ish ft lbs at redline.

That's NOT a FP Big T28. His mods list needs to be updated. He's running a GT2871r .86ar on that dyno. There is no way in hell a fpbt28 can make that power.

[95lstegman]

Jason -

You also need to take into your research that most dyno pulls are done in 4th gear, and we all know how that will effect dyno plots....When people say it has full boost by 3000/3200 RPM it is probably true for a 2nd gear pull when gearing is on your side ya know???

i think it's the opposite, cody. when i'm in 5th geari hit full boost on the stock T25/stock boost/stock i/c at about 3100rpm. but if i floor it in first it sure seems like i wait all day for boost at all, like the engine is outrunning the turbo for a good while. but i never look at the boost gauge in first gear. there's no time. i just don't hear the bypass valve actuating as much as usual during my 1-2 shift.

wow, looks like my thread is becoming a loss. i guess i'll have to pilot my own way out of the truck-like powerband of our sports car powerplant, since nobody else seems to be capable or willing to do it without a monster race turbo. oh well .

[Dori Dori]

Its the intake manifold. I took this off another board, but it shows the before and after pulls made with the installation of a Greddy intake manifold (knock-off actually).

[codyace]

That's NOT a FP Big T28. His mods list needs to be updated. He's running a GT2871r .86ar on that dyno. There is no way in hell a fpbt28 can make that power.

Thanks Dori....Jason and I both doubted it, but we couldn't debate it as there was no information otherwise

Also fantastic link with the Manifold comparison....exactly what I think Jason was looking for.

[grosspolluter]

Different cams and chip would do it....

[Nismo_Freak]

Post deleted

It's running an SR16VE N1 oil pumpStock SR16VE cams, ported head, and alot of other engine work.

[95lstegman]

yeah, it's kind of what i was looking for. actually, it looks pretty wierd, with gains only at the very top of the curve. what i'm really tempted to do is make the GReddy IM my first mod even before i increase the stock boost, and get a before and after dyno sheets (both with tuning, of course). but alas, i have been blessed (read: cursed) with an '89, which has a new problem every week, not to mention just about every moving part underneath is worn out.

[codyace]

I could only imagine how just a simple cam change (persay JWT S3's) and the IM would widen up that powerband...If you could Jason, def save up for some S3's for your car

[95lstegman]

as opposed to S4's? i'm more leaning towards S4's, although even S3's would probably make me happy. anything would be significantly better than stock, although from me research and my knowledge of camshaft design i think that in general JWT's cams are probably the #1 bet on the market for performance cams [for street cars, anyways].