Motor: LS1 with 317 heads and triple 12 cam.
I building an twin turbo set-up for my 67 chevy truck and need a little help picking some turbos. I'm looking for a turbo that will spool quick. The first choice turbo would work but afraid the big A/R housing is going to hurt spooling. The second choice is bigger turbo over all but if I go with the .68 A/R would hurt me up top. if go with .81 house should spool ok. The last turbo is the best choice but out of budget. What do you guys think.

Here are the two turbos picked so far.

1. BorgWarner Airwerks S200SX-56, with 1.22 A/R Twin Scroll Turbine Housing
Compressor: 56mm inducer / 69.6mm exducer,
Turbine: 69.6mm inducer / 61.5mm exducer.

2. Magnum Performance 60-1 / P-Trim .68A/R or .81 A/R


Dream turbo but budget can't take it.
Borg Warner Air Werks S200-56 / S256 Turbo .86 A/R
::Compressor:: (cold side)
- Wheel: 56mm Inducer / 80mm Exducer
::Turbine:: (hot side)
- Wheel: 74.1mm Inducer / 65mm Exducer

Thanks
Guys

 

I would say for twins the 2nd turbo with the .68 AR should be fine. Some guys have been known to run much smaller on LS2 motors. Look at the trick twin kit those are some fairly small t3 turbos on that setup.

 

Trick twin Starter kit comes with t3 61mm with .48 or .68 a/r

 

id go with the 60-1 with the smaller turbine housing

 

Theses are all t4 turbos

 

I say it depends how much power you wanna make and at what boost level.

 

The goal is 700rwh and the motor is 9.1cr. 12 to 15lb of boost

 

Without looking at compressor maps its tough to say but those 60-1s might be close for you. I figure if you want 700hp, size them to make 800 that way at 700 you should be in a good spot of the efficiency island. If you figure 800hp is roughly 80lb/min of air, you want turbos what will push 40lb of air at the psi you want to run. Probably wont need a small turbine ar since you have some extra torque with the ls1 but obviously nothing big either. Just my opinion of course.

 

I would go with T3 61mm turbos

 

60's with a tight ar will be plenty. T3 will plenty of power.

Our Lightning twin kit just Dyno 750@16psi
With precisions 67/65 T3 units. Lots of room.
Customer tells me the truck is stupid fun on the street.
Has to get use to the power and for well the spool.

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The twin we offer for gm's uses the
61/52 t3