1 60mm has more area than 2 40mm.

2827mm^2 vs 2513mm^2

2 40's cost ~$120 more than one 60.

That difference doubles when you go up to the next size 4x mm.

Bigger turbine is the way to go.

 

408 twin t70 .81ar

 

....I was talking about 2 60mm's and a small turbine to achieve great spooling and to uncork the topend.

 

I would love to see someone with a twin scroll 0.80 a/r t4 housing 91mm with a spoolvalve and 2 or 3 wastegates on a small ci engine...... hmmmm.....

 

Now as far as intakes go, GMMP/VIc Jr and elbow setup or just stick with an Ls6 or fast? Been reading that the Ls6 and Fast' composite material doesn't like boost pressure much..

 

410ci S85 here.... should have some final dyno numbers by the end of the week. Wow... still cant believe its almost done.

 

I have a 402 and had that exact turbo, s400sx3 - 76mm and 80mm with the 87/81 turbine and it was great. 800hp all day with the 76 and drove great! Top end was also fine, but I shifted at roughly 6200.

 

i have had a 408 and a 88X(S500 Based 88mm) for over a year now...just sitting in the floor hahahahah

 

Old thread, but I just added a GT91mm, 408, and meth 4nozzles, dual walboro 340s, 3.08s, car weighs 4,000lbs. Anyone new doing this?

 

I have a 365 with a .96ar 98mm turbine. It would be nice to have it spool a bit faster on the street. But when it comes down to it the 370 motors are a little bit stronger

 

You are still going to be a hard runner!

 

I have 2 waste gates also, what you mean drive pressure?

 

Not to stray from the topic, but from all this im getting that a 408 might be to big for an s480?

 

I'm putting a couple atmospheres through my 408 via a procharger.

 

For a max effort race build yes, for a dd/ weekend warrior its a good match.

 

408 with twin CEA 6765's. Doesn't run yet.

 

I'm kicking around the idea of boost.From what i gather i will need to swap my pistons in my 408ci out to change compression.What pistons and rings are yall using?Also while the motor is tore down what else should be done?Rebuild?

 

I have a 408 with the BW 88mm turbo with a 1.45 AR T6 flange. It does not build boost really early but keeps pulling up to where I shift it at 6800 rpm.

The car has a powerglide in it and weighs about 2400 lbs.


I also have the Victor JR. and elbow set up.

 

we have a 408 and a s484/.96 turbine and it makes 900+ on pumpgas easily and 700whp on 8psi haha

car has gone high 7s at 174mph already also on 22psi

 

What pistons and compression are yall running?