Twin Turbo Help

Building a 466 big block with around 8.5:1 compression. Planning on running a pair of these turbos listed below. Now will they perform good on this setup? Also what type of horsepower can this make on low boost and pump gas?

Borg Warner S400w/75mm compressor wheel with Extended Tip Technology,1.10 A/R exhaust
Turbo Specs:Compressor Wheel Inducer/Exducer 75mm x 100mm with ETT
Turbine Wheel Inducer/Exducer 96mm x 87mm
Turbine Outlet 5 Inch V-Band
Turbine Inlet T6 Divided
Turbine A/R - 1.10

Also its going in a car thats mainly street driven so the boost will not be nothing too outrageous and run on pump gas(93 Octane).

Thanks for the input

I would go with 76's or 80's. Probably 80's with a 1.0 or 1.08 A/R.

The right twin 76mm turbo can take you to 1500+ hp.....X2 on the 1.0 or 1.08 or even 1.32 with the big cid I would look at the bw s400 it is a 76mm turbo with a 1.32 and can be had for around $600.00 each new....just my .02 $

I now have a set of 88's with 1.32 housings for my 528ci. Haven't tried them out yet but they have been over 200mph on a Chevy so I should get 300mph out of them.

Damn right!

Northwest outlaw wrote:The right twin 76mm turbo can take you to 1500+ hp.....X2 on the 1.0 or 1.08 or even 1.32 with the big cid I would look at the bw s400 it is a 76mm turbo with a 1.32 and can be had for around $600.00 each new....just my .02 $

I found these, would they be a good option?

Borg Warner S400w/75mm compressor wheel with Extended Tip Technology,1.32 A/R exhaust

Turbo Specs:Compressor Wheel Inducer/Exducer 75mm x 100mm with ETT
Turbine Wheel Inducer/Exducer 96mm x 87mm
Turbine Outlet 5 Inch V-Band
Turbine Inlet T6 Divided
Turbine A/R - 1.32
Horsepower Rating 500-1050

yep!! I am a big fan of the new BW technology.

oktw88 wrote:Building a 525 big block and planning to do a twin turbo setup. If I do twin 88's with a .96 A/R is that the right size turbos to run on a big block and allow it to breathe. Also its going in a car thats mainly street driven so the boost will not be nothing too outrageous.

Thanks for the input

I'm assuming those are GT4788's you are referring to. On a max effort setup, you might be giving up a few hundred horsepower, but those GT4788's will still make really good power. You really need a little larger A/R if your are looking for a max effort setup. You will run into some backpressure in the higher pressure ratios.

PM sent back.

On the setup I posted above will it be safe to run around 8-10lbs of boost on a factory D0VE-A block or should i go ahead and start looking into buying an aftermarket block. The car is mainly going to be street driven and run on pump gas. Also the RPM's will be kept at 6K or below.

Just a quick run down in my eyes you will be fine. The key to make any thing live is the tune..read the plugs read the plug it is the window inside your motor.

Thanks alot for the help.

No problem some time i dont get back to fast as we are testing and protyping new parts.

Northwest outlaw wrote:No problem some time i dont get back to fast as we are testing and protyping new parts.

How is the chassis coming along?

We have put it on hold for now. We will pick it back up after we get our turbochargers, bov, wastegates on the market.

what brand turbo's you gonna carry?

They are our own line of turbos, bov, and wastegates. We are still testing and hope to have the on the market buy the end of the year.

Northwest outlaw wrote:They are our own line of turbos, bov, and wastegates. We are still testing and hope to have the on the market buy the end of the year.

Thats cool Jason, I might want to boost my junk a little...later Jason