1971 Chevelle twin turbo (pics)

[TT402LS1]

Here are some pics of my progress..







Ron

[camcojb]

Slick setup Ron. I also have a twin turbo 402 going in my 64 Chevelle. I don't have the tig skills at this point, so I'm using some Nelson Racing headers. He's re-doing the headers right now, should have them back in a week or two.

Nice work.

Jody

[Samckitt]

Beautiful is all I can say. Keep us posted.

[evan]

Looks good. What kind of fuel injection are you going to be using?

[whytry]

That's awesome!!!

[shmoov69]

sweeeet!

[marxcamaro]

Great job! I like the unique area that you placed them. Very tidy look!

sweeeet!

[TT402LS1]

Looks good. What kind of fuel injection are you going to be using?

Thanks! I will be running an Edelbrock Victor Jr EFI manifold with a FAST 4 bbl TB. It will all be tune on a friends of mine 901 Super Flow dyno using Big Stuff 3.

Ron

[Blown353]

Ron,

Have you considered going with an elbow and a monoblade TB?

I've done a couple boosted cars and the monoblade/elbow setups have better mixture distrubution and throttle response than the 4-hole TB's. I'm doing another monoblade/elbow/Vic EFI right now actually on a Ford.

The 4-holes work well on naturally aspirated cars and work pretty good on boosted applications but the elbow/monoblade setup really shines on a boosted engine.

[camcojb]

Ron,

Have you considered going with an elbow and a monoblade TB?

I've done a couple boosted cars and the monoblade/elbow setups have better mixture distrubution and throttle response than the 4-hole TB's. I'm doing another monoblade/elbow/Vic EFI right now actually on a Ford.

The 4-holes work well on naturally aspirated cars and work pretty good on boosted applications but the elbow/monoblade setup really shines on a boosted engine.

exactly what happened when I went from 4 hole to monoblade, better throttle response and a much better look in my opinion.

[TT402LS1]

I guess I never gave it any thought. I thought people only used the elbow in Camaro/Firebirds due to the lack of hood clearance. I was gonna use a 1300cfm Fast TB. Would a 90mm flow as good with an albow? Who makes nice looking elbows??
And what about the throttle braket? Can you buy them or does it come with the elbows? I do like your set-up Camcojb!

Thanks - Ron

[camcojb]

I guess I never gave it any thought. I thought people only used the elbow in Camaro/Firebirds due to the lack of hood clearance. I was gonna use a 1300cfm Fast TB. Would a 90mm flow as good with an albow? Who makes nice looking elbows??
And what about the throttle braket? Can you buy them or does it come with the elbows? I do like your set-up Camcojb!

Thanks - Ron

I made that bracket myself. You're kinda on your own for that.

Jody

[TT402LS1]

I made that bracket myself. You're kinda on your own for that.

Jody

Very nice! If I decide to go that route, will you be interested in making another one??

Ron

[64duece]

ditto on the elbow/monoblade. Wilson/Accufab are a nice combination. Precsion also offers a nice elbow at a reasonable price.

[Tokyo Torquer]

wow..that is beautiful.. a very clean set up. I have always been a big roots blower person, but I am starting to feel the lure of turbos.

[Blown353]

The Wilson cast elbow is nice and matches a cast intake very well. You can also do a sheetmetal elbow, that's what I'm using on the Ford I'm working on, but in all honesty I like the more "uniform" look of the Wilson cast piece on a cast single plane.

The monoblades flow a LOT of air. Don't go too large though or things can get really touchy at low-rpm and off-idle unless you come up with a progressive cable cam. Barely opening a large monoblade results in a huge change in airflow and makes the engine really touchy just off idle. A smaller monoblade will be "softer" and easier to modulate at low RPM.

If you are using 3" intake piping on your boost side (which is pretty standard) a 75mm monoblade will flow plenty as it is only 1.6mm smaller in ID than the 3" intake piping. Once at WOT the edge of the butterfly and cross-shaft presents only a minimal restriction and really isn't a concern. I run a 75mm on my car and throttle response is fantastic without being too touchy in the "off-idle" ranges.

Being that you'll be feeding 402CI I'd suggest a 75 or 80mm TB. 90mm or bigger will be really touchy off-idle unless you have a progressive linkage that is biased to be very "lazy" in the lower throttle position areas and I don't think you'll see any difference in power with anything bigger than an 80mm. Now if you were running naturally aspirated with more cubes a bigger TB would certainly be worth a look, but that isn't the case here.

[705.0Merc]

Looks great! Turbos are the way to go, especially on a heavy car. It sure works good on mine.

[LS1NOVA]

check out Intakeelbows.com also. I am very happy with his work.