TWIN TURBO 1971 CHEVELLE OVERVIEW AND DRAGSTRIP RUN

Overview of custom twin turbo setup on 350 cu-in small block chevy in 1971 Chevelle. Divided housing twin scroll Garrett T04B twin turbos on custom schedule 40 thickwall divided tubing manifolds. Dual Turbonetics Deltagate wastegates and HKS blow-offs on custom intake plenum. Carb Shop prepped Holley 750HP for blow-thru applications. Good low end throttle response with minimal high end power loss. 525HP at the crank with 8psi boost and no intercooler. Dragstrip run at end of video shows stock 2002 BMW M3 running a 13.78 with a good launch. Chevelle was eased off the line due to too much torque and still ran a 12.50
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Category:

Autos & Vehicles

Tags:

• Twin
• Turbo
• Small
• Block
• Chevy
• SBC
• Chevelle
• Nova
• Camaro
• Monte
• Carlo
• El
• Camino
• Corvette
• Dragstrip
• Drag
• Racing
• Timeslip

[klains]

Money and time. I ran the last motor for about 5 years without turbos and then about 3 years with turbos before too high of compression ultimately caused the pistons to go. If the compression hadn't been 10.3:1 instead of the 8.5:1 the receipt said I got when I had the motor built then maybe the theory that I didn't need an intercooler would have been fine. But in retrospect the intercooler would have helped possibly save the higher compression pistons from melting down due to detonation.

[TWBouska]

thinking about running a TT on the 383 im building for my El Camino, just curious, why no intercooler? im still new to turbos,superchargers, etc, but the elco is a daily driver so ive ruled out putting a big block in it.

[klains]

The original reason for not installing an intercooler was I didn't plan on running the boost very high. I was trying for a mild 600hp street motor with quick spool (little lag) and still decent high end. But as with anyone, I got greedy, trying to test the limits. Bigger Garrett GT turbos turned up to 12psi was too much. Intercoolers are good insurance but I'm not sure an intercooler would have saved the motor. It ran great and intake temps were checked and reasonable at about 10psi.

[klains]

Both do work. Some guys use a blow off at the turbo and at the plenum to unload the turbo and to unload the pressure at the throttle plate(s). The reason they both work is that they open by the vacuum signal coming off the intake manifold when the throttle plates close. I could probably get by with one but making sure not to bend the throttle plates is very important. The column of air the turbos produce needs somewhere to go when you close the throttle. The symmetrical look is a bonus.

[klains]

WOWWWWW (is five cool but six too much?) , I think I should just scrap the car then. Maybe I should buy a Mopar???

Wait, I have a better one.

REALYYYYY! I have a Chevette with a solid fuel rocket that will do the quarter in 4 seconds and make your Mopar shit itself with fear!

I'm such a poser for designing and building my own twin turbo setup, welding up my own frame so I could fit 335 tires and building a car that I have repeatedly taken to the road racing track. Not a drag car dude.

[klains]

Ran for 20 minutes at full throttle on a road course multiple times and didn't have any issues. But I agree it does look close.

[2xchrome]

That's sad! Waste of money. 12 seconds. Lol

[yandusud]

sound ??????

[Gingerw00ki3]

@klains : If you are bending TB plates... you've got something WAY more wrong with your setup than too high of boost... the only thing BOV's and Wastegates are used for is to stop compressor surge... where the TB slams shut, a crap load of air gets jammed into the charge pipping, and forces the turbo to snap backwards... Most K03's or TD04 setups will produce 12lbs of boost, so why the bigger turbos?

[Gingerw00ki3]

@TWBouska : Don't use turbo's on a standard stroker setup. usually stroker kits will want to push the compression ratio 10:1+... for a chevy 350, get a forged crank; stock stroke; run a mild cam ground for high rpms; get some good aluminum heads (helps dissipate the heat); and don't be cheap with the turbo components... that ebay crap will blow after a year or two... Tune your car and keep a close eye on the AFR...

[69Cutlass385]

Huh, my 350 runs 12.8 on motor. You have a power adder. How is that possible?

[DVcustomZ]

@klains All that could have been solved with meth injection right after the turbo working as A chemical intercooler have seen a couple ppl run a 76mm w/out intercooler with thatset up

[TWBouska]

@maxredgizmo 350 is a small block. also, considering he doesnt have slicks 12.5 for a DAILY DRIVER with no slicks is pretty damn good.