Thread:

finally located a Gale banks twin turbo set up

cool deal! you'll enjoy it! hollar at hass828 if ya have any q's bout it all, he knows em veryyyy well.

Originally Posted by tomply32

thanks for the replys.i am collecting a lot of info and will change a few things.i noticed this was set up for the water to go thru the carb mount instead of oil .maybe it was better since the t shield had hotter water to warm the mount floor

hass had his using water thru it too, but i think he eventually bypassed it all together.i think they expect these kits to be used during the winter or something, only reason you'd need a heated carb mount box that i can see, summertime the fuel evaps well nuff on its own before injesting into the turbs.

Originally Posted by tomply32

just picked up a stage III twin turbo set up .very complete low hours in great condition.any one have a plumbing diagram for reference i know most of it but there are a couple solonoids and hoses i am not 100% sure of

tomply32, I just bought a complete Gale Banks twin turbo system as well. Turbos are a new territory for me. I don't mean to hijack your thread but rather hopefully shed some light onto what you might have (or might not have) just purchased yourself.

In my case, the system uses the Rayjay turbos, and they are in fine shape (a turbo rebuilding friend of mine looked them over). These Rayjays also have the cast-iron water jacketed exhaust housings. Here is what you might want to look at with your turbo housings on your Banks system:



Looking up into the turbo from the exhaust flange (which bolts to the transom log/header flange), you can see where the exiting exhaust is sent through the turbine vanes (red arrow). But, there is also a bypass port (blue arrow) which diverts exhaust from the turbines and sends a major portion of the exhaust straight to the exhaust pipes! My guess is that this is a built-in "governor" which acts like a pre-set waste gate and keeps boost down (due to the day cruiser application of these turbo systems). You might want to see if your housings have this feature.

Hass828, how much boost can be gained by tapping an NPT thread into that bypass hole and plugging the bypass altogether? On a 0.030" overbored big block, for example, might this increase boost from say, 6 psi to perhaps 10 psi or more? Or would waste gates be mandatory if I plugged that bypass port completely? What about drilling, say, a 0.250" hole into the newly installed bypass plug so as to limit the amount of exhaust that is bypassed (regulate boost that way)?

Thanks,

LO

Originally Posted by terrible_buddhist

some times pictures help...

http://www.flickr.com/photos/menard/...7616396786774/

Hey TB, I have the same exact intercooler housing and covers. Unfortunately, I don't have the intercooler cores. Do you know who makes that intercooler and/or where to get the correct cores? Or should I have them custom-made? Dimensions?

Thanks,

LO

Originally Posted by LakesOnly

tomply32, I just bought a complete Gale Banks twin turbo system as well. Turbos are a new territory for me. I don't mean to hijack your thread but rather hopefully shed some light onto what you might have (or might not have) just purchased yourself.

In my case, the system uses the Rayjay turbos, and they are in fine shape (a turbo rebuilding friend of mine looked them over). These Rayjays also have the cast-iron water jacketed exhaust housings. Here is what you might want to look at with your turbo housings on your Banks system:



Looking up into the turbo from the exhaust flange (which bolts to the transom log/header flange), you can see where the exiting exhaust is sent through the turbine vanes (red arrow). But, there is also a bypass port (blue arrow) which diverts exhaust from the turbines and sends a major portion of the exhaust straight to the exhaust pipes! My guess is that this is a built-in "governor" which acts like a pre-set waste gate and keeps boost down (due to the day cruiser application of these turbo systems). You might want to see if your housings have this feature.

Hass828, how much boost can be gained by tapping an NPT thread into that bypass hole and plugging the bypass altogether? On a 0.030" overbored big block, for example, might this increase boost from say, 6 psi to perhaps 10 psi or more? Or would waste gates be mandatory if I plugged that bypass port completely? What about drilling, say, a 0.250" hole into the newly installed bypass plug so as to limit the amount of exhaust that is bypassed (regulate boost that way)?

Thanks,

LO

Lakes if you block the bypasses you will need to install wastegates or you will overspeed those small turbos and they will eventually come apart. You can adjut the hole size and probably turn the boost up to 15 or so but be careful on pump gas at some point just past there it will detonate.

Originally Posted by LakesOnly

Hass828, how much boost can be gained by tapping an NPT thread into that bypass hole and plugging the bypass altogether? On a 0.030" overbored big block, for example, might this increase boost from say, 6 psi to perhaps 10 psi or more? Or would waste gates be mandatory if I plugged that bypass port completely? What about drilling, say, a 0.250" hole into the newly installed bypass plug so as to limit the amount of exhaust that is bypassed (regulate boost that way)?

Thanks,

LO

My old RaceAero setup on a 460 CI BBC, Performer RPM heads and a small SR cam made 13lbs (5400 rpm on a AA) with the holes in the exhaust housing completly open, i then blocked them off to about a 1/4" and boost went up to 18lbs (5900 rpm). My guess was about 750-800hp @ 18lbs. I was going to put the setup on a BBF and i mocked it up with some addapters from C. Evans and it was going to work out pretty good but i decided to go another direction. Like Hass said, its real easy to over spin those little turbos and they will start to puke oil and destroy the center section. Doing it agian i wouldn't go over about 10lbs boost on a BB, i personaly toasted a few RayJays on that deal.