retfr8flyr

I have Jim's kit with twin 57mm BB turbos and they work great. Give Jim call before you give up in the twins idea.


Earl

JIM5.0

Speaking of turbo lag, is it possible that any of the linked vendors could make compound turbo set-ups for each bank?

What I mean is basically you have 4 turbos. on one bank, you have a small turbo for instant little-lag or even no-lag off-the-line acceleration, and then once you hit higher RPMs, you have the larger turbo which should be spooled up to speed pumping in some serious HP, the 700 HP range.
You have the same compound turbo set-up for the other bank, and this is how you have 4 turbos.

Simon1

The application needs to be done right.

I loved my turbo. Street driving was fun, but the TS blower is the best IMO for a DD street car.

brandon357

hey earl, how much power are you making with your setup, because hellion told me with the t66 i could make up to 700 whp. if its not much of a difference then i would probably just put the extra money it would cost to twin turbo it into building the motor.

Stango36

Look at this one

http://www.usmusclemods.com/store/13...duct/TUR-15168

pascal

It doesn't matter how much HP those turbos will get you...
If you keep a stock engine, it will blow before you get to 700 horses.
After 10psi (which equals to roughly 500hp at the crank) on these engines, you're on burrowed time.

Although I am not an expert in FI, the twin turbo concept is trying to avoid lag and getting torque down low.
That's why you see a smaller one in some applications... It comes on first and right away while the other one takes you to max power across the grid.
It takes some good engineering to make it work perfectly but it pays off in the end.

For DD on any V8, a Roots style blower seems to be the most user friendly like Simon says.
Smaller engines (like 4 bangers etc...) prefer Turbos though...

forensicsteve

will probably just end up going with a single turbo

It won't be so bad. You won't feel too deprived. When my car was street driven, I was never into light to light racing or street racing period. The 67mm single turbo was quicker in response than the Procharger that was on the car before going turbo. The 67mm is good for about 650 rear wheel with the appropriate build support. Car has the 76mm now and that definitely did lag on the street, but is irrelevant now since car has been rebuilt for dragracing only and any lag is functionally eliminated.

Got to be careful with these single turbos though. The monster torque they generate can eat up your internals, transmission..whatever.

pic of car launching with the 76mm, with the old build.....no lag. See the torque twisting and rippling the huge Hoosiers. The rims are drilled into the rubber and you have to build up the rear end to avoid snapping like a toothpic. After shredding a trutrac, we spooled the 9 inch rear

pascal

LOL, if I was to build a serious drag Stang, only the 9 inch rear would do.
I like a piece of mind.
The challenge is almost always in transmission when you really hook up.

retfr8flyr

As has been stated with the stock internals you are limited to about 450 rwhp, if you want to be safe, so any FI will get you there. A properly designed twin turbo setup will work better for a street driven car than a single when you get into higher power levels. Anything around 600rwhp and higher with a single makes IAT,s very high and hard to deal with and spool time gets longer with a big single. I can make whatever power I want up to about 800rwhp, at that point I would be getting into the limits of the efficiency of the 57mm and even though it would make more power it wouldn't be practical. You could probably make 700 with a t66 but your IAT's would be off the charts pushing that little turbo so hard. In my setup the turbos start spooling about 2000 rpm and are fully spooled by about 2800. The setup spools so fast it hits like a TS but just keeps on going and it is very fun to drive because if I stay out of the throttle it drives like stock.

Earl