avo turbo

James, that mean setup for the street is overkill in parts dont you think?

the average joe doesnt spend that sorta money on a street car all in one hit bro.

It would be better to list the parts that he needs in terms of non branded or generic things, ie turbo manifold, dump pipe, injectors etc.

But for 6 psi, Id just use a small turbo t25s or t28s even up to t3 are good for the street, use an internal gate on these turbos (which most will come with 6psi springs). Manifolds, u can cheap ones made for 600, avo's cast ones set u back about 800, get a cheap intercooler, evo/vr4 ones rock, bov (turbosmart, or whatever cheap brand, hell dont even need one, just ask powered by honda), fueling u can go the cheap 1 injector, but id go 4 rx7 injectors or other big top feed injectors, drill into the fuel rail, and get a good computer to control it all.

fuel pump and fuel reg? its honestly not needed at 6 psi, when i ran the lude, it was sweet, and never ran outta duty cycle at 6 psi, i was running stock injectors at 5 psi for abit.

at 6 psi ud be surprised but ur VTEC/turbo is quite fast :)

I think its overkill as well, the GT30xx is a bit big if you are only gonna run 10psi or under (which, lets face it, is the case when running stock internals), full-race mani is hella expensive for someone once again only for for a small street setup (besides which, the full-race mani's arent compatible with air con are they?).

I'm not sure why you'd need the MSD spark unit either, and the stock radiator and fan should work fine. Similary i dont see the point of changing the intake mani running stock internals either. Fuel rail, again i think a bit unnecessary.

I agree with you regarding the rest of the fuel setup (though you dont need 660cc injectors, there's no harm in having bigger ones when you get the urge to upgrade). The FPR is a good idea, simply because you want to hold the fuel pressure steady, and if you get one of the nice units with a gauge built in it helps you keep an eye on things while you are tuning. Its not necessary but you can get the things for under $200 easy, so its not expensive either.

just curious poid but wont the smaller turbos run out of puff so to speak by the time you hit about 8k ? (i think this is why james is suggesting it)

obviously the smaller turbos would be good for the lower reving engines.


allthough i could just be showing my ignorance =)

-2ds

gt30 LOL...did u read his first post..he wants something mild..not to build a frikkin drag car. Id use a t28 or the biggest would be a t3 for a street setup and like porn star said even running 7-9psi ull see a HUGE improvement. Also a full race manifold WTF? read his first post he doesnt want to spend MUCH...their manifolds are over 2000 dollars alone.

Also in YOUR LIST for unreal streat car u left out pistons and rods mate..

Quote:

---

just curious poid but wont the smaller turbos run out of puff so to speak by the time you hit about 8k ? (i think this is why james is suggesting it)

obviously the smaller turbos would be good for the lower reving engines.

---

the T28 isnt a really small turbo though, its what the 200sx runs as standard on its 2L engine. Running low boost i dont see any reason why it should run out of puff.

If you were running 1 bar or over then it may be a different story, however we are talking street turbos on standard internals. The smaller turbo will almost certainly spool up sooner and give better low down torque.

Most Honda turbo guys seem to run huge turbos even for low boost street applications for some reason though

Quote:

---

Most Honda turbo guys seem to run huge turbos even for low boost street applications for some reason though

---

I think the reason is pretty clear as to why, hey Pete... ;)

whoa relax havok, james is only inputting what he thinks, its what is good for the board, he has alot of experience in this area, and though some dont believe in what he says, he should be heard anyway. I mean his the fastest FWD in vic atm, i think he knows abit about turbos.

I think the main point that he missed was that some people are not after an all out drag machine. His setup is one of the most comprehensive setups i know, have seen, read about.

But in this case, we are talking about a mild power increase, at 9 psi most honda engines double their power output with a proper exhaust and tune. I'd say that at 9psi however that the GT roller is abit big. The 450 roller though i dont like to admit it on my prelude was abit overkill, even though i loved every second of it. I didnt mind full boost hitting at 5k rpms.

Honda people argue that with high revving motors and one of the best flowing heads, that big compressors are the way to go. What isnt being said is that on the street a small turbo gives much more useable power.

Anyways chill out Havok, its only a friendly discussion :)

before one balls gets in on this act, my granny shopping trolley and what i intend on doing to it is spose to stay secret ok binh? thanks bud

There’s reason behind everything, like I said in my first post you don’t require everything but everything helps…. Just like the MSD unit, when you push boost into a high compression engine (stock) you want to make sure you burn all the fuel from a large spark, thus why a spark amplification unit’s are very handy. If the engine requires X amount of fuel I wanta make sure I burn all of it !

As for the GT30xx why do you think I said xx ! ? u can put a gt30xx in a t28 exhaust housing, although most commonly you use a t3, the size of the turbo regardin spool is all to do with the exhaust size ie .53 .82 . 110 the GT30 part is the intake compressor side of the turbo.. will a small turbo on 7psi and a large turbo on 7psi make the same power ? of corse not !!! will the larger turbo put more stress on the engine at the same psi ? no !

Iv used GT30 turbo’s on all my customer cars and most of them all have stock engines, it’s a great sized turbo, yes its expensive but well things are expensive for a reason, I refuse to cut corners in any work I do or recommended. Spool of a turbo is not designed around the size of the compressor but the size of the exhaust wheels and turbo housing, I did not specify these specs and these depends upon the application.
Iv also done back to back testing on many different turbos once you understand turbos you will see when you call turbo t25 t28 t3’s blah blah those figures mean bugger all its comes down to the trim sizes which is all the difference.

Regards James

Oh the reason why most turbo Honda ppl use slightly larger turbo's is

A = traction, were fwd not rwd we can't leave the line fast, boost at 1000rpm would kill us off the line..
B = we have a high compression engine = faster spool....

What works for a Nissan doesn’t mean it will work for a Honda !!

Regards James

Since you have done all this testing, could you post some results as to the differences between running T25's, T28's and GT series turbos (GT25/GT28, GT30 etc) and state the different trims? I would be very interested to see the results at various boost levels

hand over my research !! i can't do that...thats our workshop secrets...
trims turbo sizing and spec's make or break any car....... generally thow you can put a gt30 in a t25 t28 t3 or a t4, the smaller exhaust size gives boost sooner, but less top end power. GT30 turbo's also come from 300hp upto 750hp each application is dependent on what the customer what’s and how far the customer will go in the future etc....

Regards James

Quote:

---

Originally Posted by BLKCRX

As for the GT30xx why do you think I said xx ! ? u can put a gt30xx in a t28 exhaust housing, although most commonly you use a t3, the size of the turbo regardin spool is all to do with the exhaust size ie .53 .82 . 110 the GT30 part is the intake compressor side of the turbo.. will a small turbo on 7psi and a large turbo on 7psi make the same power ? of corse not !!! will the larger turbo put more stress on the engine at the same psi ? no !

---

Sorry i just re-read this, but do you have your turbo designations around the wrong way, or is it me? The GT30 part of the designation should refer to the exhaust housing not the compressor housing (just like the T3/T4 hybrids...T3 exhaust housing for earlier spool, T4 compressor housing for more power).

This is why i asked why you were using GT30xx turbo's, because GT30's all have a GT30 turbine, the xxbit refers to the compressor its mated to. So when you are saying to put a GT30 on a T28 exhaust housing that is basically a GT2830 (or GT2530) which is what i mentioned as being a good street turbo.

So a bit of confusion (for me anyway) but seems we're on about the same thing after all