proper turbo for a hybrid

[patgizz]

say theoretically someone has a TGP. they think the 3.1 intercooled turbo lettering on the plenum isn't enough reason to keep the gen2 top end when a 2000+ 3x00 topend can be had for under $200 with roller rockers and all. so they decide to swap that in, and do a mild cam in the .420/.443 int/ex lift range with a 278/288 duration. say the car also has a 5 speed manual in it.

knowing custom rear manifold and custom crossover are no problem, and turbo can be placed wherever, and that the ABS and PM3 would be disappearing in favor of the more compact vacuum brake setup, which turbo should one be looking for to replace the original T25(which would then be used elsewhere)?

all hypothetically speaking

[bszopi]

all hypothetically speaking

I wish my dreams were this vivid...

Next time you dream and you are assembling this "hypothetical" engine, are you gonna take pics?

[RebelGT]

HX35 FTW

Anti Surge Compressor Housing, Twin Scroll Turbine Housing, rugged lil pieces, cann't really go wrong with one of these. If you want to upgrade it, you can get a quick spool turbine housing from bullseye as well.

[patgizz]

I wish my dreams were this vivid...

Next time you dream and you are assembling this "hypothetical" engine, are you gonna take pics?

certainly. i got a special camera that does that for me.

[Guest]

if you keep the t25 mounting flange then I would give ATP turbo a call and get their T25/40 upgrade turbo.

Has the exh side of a T25 but a cold side of a Gt35R. Can't beat it.

[pontiacjeff]

3100/3400 topend? Here's what you need... it will only work with an automatic, though. I built a 3400SFI turbo and later demodded it. This is what's left:

[timg]

GT30R or GT35R... The GT30R's are available with T28 inlets and T3 inlets. The GT35R is available with a T3 inlet.

Tim

[Nightingale]

What about the hy35w? It has a smaller housing so it should spool quicker then the hx35w. I am thinking of mocking up a system with the hy35w since I've heard it uses the t3 flange.

[pontiacjeff]

Or why not use a real turbo... Garrett! LOL!!!!

(not trying to start anything, just my opinion)

A GT28 non-roller bearing can be had for a good price and will flow enough air for 350hp. Or, use a crossover pipe something like I built (in the pics above) and use a T3 .63 a/r O-trim with a T04E Super 60 trim. You should be able to make 250-275whp on 10-12psi, intercooled. Use all the factory piping and intercooler and modify as needed. That intercooler is pretty good.

[X11_STE]

If you want a cheap an easy way, find an IHI turbo off an '87-88 T/C T-Bird. Boosts up to 16psi and comes on around 900rpm.

[RebelGT]

Or why not use a real turbo... Garrett! LOL!!!!

Because holsets are good/strong/cheap! I got my HX40 for $50 in mint condition!

[pontiacjeff]

If you want a cheap an easy way, find an IHI turbo off an '87-88 T/C T-Bird. Boosts up to 16psi and comes on around 900rpm.

The problem with that is by the time you have it rebuilt, you'd spend as much or more than a good T3/T4 hybrid and have a too-small turbo.

Call Tom @ Turbo Resource in Lake Havasu City, AZ. 928-505-5406 He is the best price I have found on rebuilt Garrett turbos. He builds them custom, too. He built this for me... $749.00. Custom "T-88" TV7585 hybrid with REAL Garrett parts. It's on my 455 Pontiac V-8. You don't need one that big! LOL! But he can build a T3/T4-60-1 for unheard of price! Keep the hot side down to a Stage 4 or O-trim and the 60-1 will flow enough air for 400hp at 10-15psi (if needed).

[X11_STE]

The problem with that is by the time you have it rebuilt, you'd spend as much or more than a good T3/T4 hybrid and have a too-small turbo.

Maybe, but since alot of the T-Bird guys upgrade to the T3, you can find IHI's on ebay in good shape (not needing rebuilt) for cheap. As far as being too small.... Well, it all depends on your application. For a 2.8 or 3x00 the IHI would be fine. It comes on around 900rpm and tops out @ 16-18psi.

[Guest]

hahhaahha boost at idle? What a joke. Talk about nothing but hot air. IHI is a heat generator for a v6 application of our motor sizes. And tell me where you are going to find a good IHI turbo off of a T bird that is 18 years old? Why the hell do you think the person is putting on a T3 in its place? Cause its garbage.

[pontiacjeff]

hahhaahha boost at idle? What a joke. Talk about nothing but hot air. IHI is a heat generator for a v6 application of our motor sizes. And tell me where you are going to find a good IHI turbo off of a T bird that is 18 years old? Why the hell do you think the person is putting on a T3 in its place? Cause its garbage.

Now, now, be nice. It was only a suggestion on his part.

Like the T25 used on the McLaren GP, it all depends on the intended use. GM wanted a swift kick in the ass and that's what it gave the 3.1 in the GP. Instant boost. Except that engine peaks out at 3600RPM and falls off flat to 4500 when it weezes out. On a 3400, the TC IHI turbo would do the same thing. SO, yes, boost off idle is a possibility, if that's what you're going for. But you might as well leave the T25 on it.

I am currently building a 3400 turbo for a Fiero 5-speed. He wanted boost at the flick of his heel and that's why I am using a T25-flanged Mitsubishi TD06 20G turbo. It will have fast spool but still flow enough air for 400hp. It made 275whp at 16psi on my 2.0L 4cyl. I rebuilt it and am using it on the 3400. With the manual trans, it should have full boost at part throttle and peak around 5000-5500, which will enable it to live a nice long life on the street.