Rear Turbo Stealth Done

[toddrs93]

STS Universal kit, all custom built by us here at
AUTO VELOCITY


The end result was about 100 wheel horsepower gain at 6-7 pounds of boost.

[Stealthee]

Nice.

The question is, is it going to succumb to the issues of other STS setups out there?

[toddrs93]

My biggest worry is the oil pump they supplied. Its an in line booster just after the turbo on the return side, I think we are going to look for a better one.

[AutostradaVR4]

Originally Posted by toddrs93

The end result was about 100 wheel horsepower gain at 6-7 pounds of boost.

Why is the power gain so much more than a standard turbo setup at similar psi?

[Stealthee]

Originally Posted by BlinkRA182

Why is the power gain so much more than a standard turbo setup at similar psi?

Its really not. Look at NA to TT conversions. They usually do about 170 na whp. When they go TT they usually run about 6-7 psi and can do 260whp easily.

[Polygon]

Two words, compression ratio.

[toddrs93]

Originally Posted by Polygon

Two words, compression ratio.

people turbo high compression motors all the time. Its should handle 8-9 psi OK for a while. When the motor does go we will probably go with TT pistons and heads to lower compresion then.

[Stealthee]

I think Poly's post was answering Blinks about why it gained so much power at low boost.

[AutostradaVR4]

what are the benefits of going with a rear-mounted turbo system over a conventional setup? Obviously the turbo will stay cooler...but that just seems like alot of extra plumbing.

[Stealthee]

Only real benefit is "hiding" it.

[Polygon]

The downside is pressure loss.

[toddrs93]

Originally Posted by Polygon

The downside is pressure loss.

Yea we found about a 2psi loss of boost from the turbo to the engine so you have to compensate for that. hers the claims directly from STS:

Lower underhood temperatures. No need to worry about melting wires, hoses, or other engine components, as with a front-mounted turbo.
Ease of installation. STS turbo systems can be installed in about 8 hours with standard tools and average mechanical ability.
Cooler oil to the turbo. Cool oil is better for both the turbo and engine.
Performance Sound. The turbo acts as a muffler and sounds like an aftermarket performance muffler. Turbo spool and rushing air from the blow-off valve make a unique sound that will turn heads!
No need for major modifications to your vehicle. STS systems are designed to "bolt-on" to factory mounts.
Increased gas mileage. Unlike a belt driven supercharger, the turbo utilizes "wasted" energy leaving your tailpipe. Most of our customers get 1-3 mpg increase in gas mileage compared to their original stock mpg numbers.
Converts back to stock in about an hour.
More room under the hood. Future repair work or modifications will not require the expense of removing the turbo system to allow access to engine components.


Lowest Intake Air Temps. Low IAT's equate to more horsepower per pound of boost than any other forced induction option. STS intake piping provides built-in intercooling. Add the optional intercooler, and IAT's drop even further.
Approximately 500F lower turbo temperatures. Eliminates the need for a turbo-timer, which allows the engine to run after the car is shut off in order to cool down the turbo and prevent oil and bearing damage.
Denser exhaust gasses drive the turbo turbine wheel more efficiently.
Turbo is exposed to ambient air rather than underhood air. Allows for better cooling of turbo components.
No need for expensive headers, mufflers, or exhaust systems.
Turbo is closer to the tail pipe outlet. Provides a better pressure differential across the turbine wheel which promotes better flow across turbine.
Better weight transfer. Increases traction because the bulk of system is mounted in rear of vehicle rather than up front.
Less noise and heat in the passenger compartment.