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Old 08-15-2002, 08:07 PM
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Post Twin Turbo's on a Carbureted Small Block Chevy..

My best friends dad knows alot about engines and he has a good idea on how to make this work.

He just told me to ask you guys what your thoughts are on it. Maybe someone here has some knowledge in this area as well?


The idea is to Put twin turbos on the engine going in my S15. Now if anyone can shed some light on this topic for me that would be great.

I know its possible but I want to know the pro's and con's of it. It sure would be "ORIGINAL"

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Old 08-15-2002, 08:24 PM
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Hope you have lots of moola and can fabricate all the piping and bracketry, entirely possible but not cheap or easy. Would she ever fly though. Is your engine ready for a turbo?
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Old 08-15-2002, 08:32 PM
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Well his dad has a couple T4 turbos that he is going to give me...PLUS he owns his own business. A Machine shop. He has every tool I would need.


I would need to either find some compatible headers or design my own.

The engine is ready to have anything thrown at it.
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Old 08-15-2002, 08:34 PM
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My main question is...


Do you think it would be worth it? Its either that route or I just slap on some good heads and call it good. (It would be N/A engine then)


Just throwing some ideas around.
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Old 08-15-2002, 08:38 PM
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I still say you should just buy some plastic piping and fabricate a path into the intake from a leaf blower... Cheap.
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Old 08-15-2002, 09:31 PM
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Think you need super low compression for turbos like 7.5:1.
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Old 08-16-2002, 06:59 AM
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Turbos are great....no doubt. But...they are not a modification that you do without knowing what your doing. T4 turbos are very large turbos and getting two to work together will likely take a substancial amount of fabrication and tuning and knowledge to get to function properly. If you want a turbo I suggest you try to get just one functioning properly before you add another turbo into the equation. Doing this kind of mod is not just a matter of bolting it on and tuning the carb. The engine should be modified to take advantage of the forced induction like you would modify a blower engine. Don't forget you need to supply the turbo with pressurized engine oil too, you can't just pull the oil pressure sender and plumb a line in. This is a very complicated modification that is not too hard to plumb but very difficult to get just right. It is very possible that you will end up with an engine that actually performs worse or blows up.

To do a custom install like this it must be tuned on the dyno, things like tubing diameter and exhaust length all affect the final result and getting it right is a matter of trial and error and skill/experience. If you want a turbo you would be better off buying a complete kit including a correctly sized turbo for your installation, Gales Banks Engineering makes turbo installations for motor home and trucks and has modified just about all there is to modify.

<a href="http://www.bankspower.com/" target="_blank">http://www.bankspower.com/</a>

They specialize in trucks primarily now but at one time they did every type of turbo install you can think of. I cannot quote but assuming you have the correctly sized turbos for the job the install should cost around $5000......if you know what you are doing. I would ask some questions from the experts before you start with this kind of mod, if you are having trouble with tuning a naturally aspirated engine a turbo install will be way over your head.....never mind doing a twin turbo install. Just fabricating the exhaust and turbo mount is a substancial project all by itself and ideally should be done in heavy gauge stainless tubing or high nickel cast iron, the local exhaust tubing bender is not equipped to handle this kind of project.
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Old 08-16-2002, 07:43 AM
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4-jaw is right, it's a pretty detailed setup. Check out <a href="http://www.turbocity.com/TurboAddOnMain.htm" target="_blank">http://www.turbocity.com/TurboAddOnMain.htm</a>

I've got a 350 in my S-10 4x4.. where would you put a pair of turbos? That engine compartment is full! You're gonna be so happy with the V8 in your S-truck, you're gonna forget all about those turbos! One piece of advice, though - go with a 700R4 tranny, not a TH350. I cheaped out and went with the 3-speed and I'm kicking myself for it.
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Old 08-16-2002, 09:10 AM
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HOW BOUT THIS: twin turbo crate engine on sbc: Nelson Racing Engines, Chatsworth, CA 818-998-5593 photo on page 36 of August 2002 HRM. Available with carbs or injection in "20 different configurations" No price listed, but if you have to ask....well, you know the rest.
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Old 08-16-2002, 09:29 AM
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Carbuerated turbo applications are a headache and impossible to tune do the the draw through design. It wasn't until efi became prominent that turbos really took off in hotrods. The best to get boost with out a roots style supercharger is with a centrifugal super charger. Give ProCharger a try they have many options for carbuerated SBC's. I know a guy with one on a 455 pontiac that pushes 18psi of boost and makes over 800 horsepower with no routine maintnence on his motor. Vortech also has a knew kit for blow through centrifugal supercharghers. The only way to put twin turbos on your carbuerated sbc is to have Kenny Duttweiller do it for you, and I'd bet he'd switch it to efi
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Old 08-16-2002, 04:10 PM
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Im just friggen around with two garrett to3s on a ford 302.... running 8 pounds of boost thru a 850 dp, and this thing rox... i gotta fab a box to enclose thecarb, right now it sprays out the throttle shafts, but the car feels like a 150 horse feel of nitrous.. gotta get the car nhra legal and take it to mass to make a quarter pass... no 1/4 tracks in maine #$%^&... turbos are kool!
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Old 08-16-2002, 04:53 PM
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Similar setup Two Garretts through a 650 DP. My Bro-in-law is doing this to a 305. He's gotten lots of help off the net. There are a couple of cars around here with similar setups that seem to work. I'll let you know more if I can find out. I do know he is mounting the turbos right to the flange at the end of the headers and experimenting with intake air via abs pluming. It won't be pretty but it should be fast.
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Old 08-16-2002, 05:37 PM
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Yea.


Well hell, I know there isnt a whole lot of room. Thats why I cut the hood and have some stuff sticking out. Hehe.


My friends dad is the one that thought of this and he knows what he is doing. To be honest I know how turbo's work and stuff but I dont know how to do this project. Thats why he is in the picture.


I just wanted to find out all the quirks involved before I attempt or even think anything.
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Old 08-17-2002, 02:06 PM
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I have been looking into the same thing I have found a lot of info and it isnt as hard as they are making it out to be check out this site he has done what you are looking for and more (only it is a FORD!)http://www.toohighpsi.com/history.htm <img src="graemlins/mwink.gif" border="0" alt="[mwink]" />
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Old 08-17-2002, 02:18 PM
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I have looked into the same but don't take the info on 'toohighpsi' too lightly, those guys know thier way around turbos quite well. In my opinion it would be insanity to attempt to duplicate Mike Sitars antics with a carbarated motor unless you know what they know. With fuel injection it gets quite a bit easier but still requires at bare minimum a good fab guy for the mandrel bending.
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