Thread: SR20 ve+t HELP!

too many variables, 2.5" downpipe is one, timing may be another, a/f ratio?

The GTIR manifold not mated properly to the head im sure is killing it too and just for the simple fact that the ve's do not like small turbos.

If your going to use the small turbo I suggest you do all you can to make it as efficient as possible. Meaning 3" downpipe, port matched to the head and so on.

I think the GT2871R is the perfect starting point for turbocharging a VE. I don't think it is too small. I wouldn't go any smaller, but if I were to build a VE+T it would probably be with a GT2871R, especially with that lower 9.0:1 CR.

I dont think its too small its just pushing the line. And like I said you just need to make sure you make everything as efficient as possible with it. 2" chargepipe on the hotside is probably hurting a bit but not as bad as the manifold not being matched and the 2.5" downpipe. I bet just getting those two things straightened out would make a nice chunk of the difference up.

Another thing you could try on the dyno is try switching only the intake cam on and see how it comes out.

2.5" dp is super restrictive, where do you have your wastegate routed?

are those the finished product pictures?

cause i think having your waste gate just open like that is no good, esp on the dyno, in fact there's a thread somewhere here about it.

also from what i was reading about external wastegates that's not a very good spot for it..



i agree with everyone else on the fact you need to port match the manifold as well as get a 3" dp. that should help.

im shooting for 300hp at 10psi with my ve / 2871 setup which is pretty similar to yours. but i'll be using the stock pistons

When the manifold was modified for a external gate, what was the process. Did they knock out the dividing wall? Can you see all four ports through the wg hole?
The downpipe is not the issue. But you will need a bigger Intercooler. What Ecu system are you using. The power band looks a bit delayed but smooth.

I would not go too far as saying that, 5-6years ago I posted a Dyno result of a de/ve t-25 13 psi pump gas making 321whp 280tq.and it was internal gated not ext. On a 2.5 downpipe up to the cat area and then 3" from there.

And if you draw those specs out on the T25 compressor map you'll see exactly why we think that turbo is way too small for a VE.

Ok, it is a small turbo, but that's not his issue. He should be making more power period and with a t-2 frame powerband and not a t-3 low boost type of grapd.A t-25 and a 2871 are two different animals.
Just to give you more info on my results. That same car I am talking about was a full de motor and tuned at 13-14 psi it was making 270's range,he removed the head and slapped on a ve head and dynoed again and came out with 32$ whp.
Those were my results.