Wiring the boost swing valve (puck) closed >

[Turbo6TA]

Not really Turbo Buick related, but I have a question that applies to something that may have been tried by someone here:

A friend has a twin turbo LS1 motor. Due to the low placement of the turbo's ( and poor overall design), they are nearly impossible to remove without lots and lots of work ... Anyway, on one of the turbos, the 2 bolts that attach the waste gate actuator mount bracket to the turbo compressor housing are completely stripped.

Due to the placement of the turbos, these bolt holes cannot be re-theaded without removing the turbo.

I was wondering if it would be ok to just wire the little shaft that connects to the waste gate valve (puck) closed. That would result in no boost control and of course max boost being supplied at WOT.

These turbos are fairly small, and I know are not capable of supplying any more than about 12psi boost at full tilt to his forged piston, steel block 6.0L LS1 motor.

The compression ratio on the motor was lowered to 8.7 with forged reverse dome pistons, so I feel the engine components and fuel system he has would handle much more boost than these turbos are capable of ever producing.

I am only worried that wiring the pucks fully closed may result in massive boost spikes.

Do any of you folks think that would be a problem? .... Or, do you see anything else wrong with just wiring these turbos for full boost is a bad idea? (BTW, he uses 2 air to air intercoolers that keep charge air temps very low)

Again, I believe that the turbos now installed are not large enough to ever over-boost this motor.

Thanks for any input,
Ron

 

[Quick6'n'-K.C.]

i would be worried that it would overboost and get more than 12psi of boost-

you could tie off both wastegates and use a external wastegate, such as a deltagate to control boost and not have to worry about taking the turbos off again
BW

 

[Army MP]

I would wire them for full boost and keep it filled with race gas, i.e. KILL MODE!!!

 

[REDS HOT AIR]

that would be a no-no

lots of reasons that would screw some stuff up

 

[Turbo6TA]

Thanks for the replies ... Were just going to dump the idea of wiring the turbo and do the job right.

Ron,

 

[Blown&Injected]

Red, what would it hurt if they are SURE it will not over boost?

I'm thinking that it might get some surge (spike like) boost at part throttle?

Sounds like a cool car - Would like to hear some details about speed and power.

 

[ChevyNo1]

Hey guys, it's my car. Ron has been helping me every step of the way with the new motor. I dynoed it about 2 weeks ago ( 700 miles on new motor now ) and with the driver turbo only partially boosting ( puck was half-open ), I finally hit 10psi around 5K rpm, and the peak #'s were 538rwhp/586rwtq. Missing a lot of torque down low, and the peak #'s are low also. I'm probably going to end up just putting in a new k-member and a-arms, then can get this fixed at the same time. That way I'll lose at least 50lbs off the car!

Thanks for all the help guys, really appreciate your input.

- Dug