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Old 04-22-2010, 09:11 AM
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Sbc Twin Turbo Kit ?

Hi Guys
i am carlos from Panama and i want make a question here to you guys that maybe can help me
sorry about my english is not very goog i will try to explain my self as better a i can.

I have a Jeep CJ 7 for offroad with 44 bogger tires am runnig a chevy 350 ZZ4 that engine give me with few mod that i put in it something like 385 hp
but i want few more hp
i was thinking to buy a twin turbo kit to get more hp but i dont know to much about this kind of mod
the engine have a quadrajet rochester 750 msd 6 offroad, msd cables, hokkers headers not much but is something
the pistons are hypertic aluminum and forged rods
Please help me to see what is my best choice
thanks alot
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Old 04-22-2010, 09:52 AM
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should convert to fuel injector first.

then lower compression to 7.5 to 8:1 cr.

then add turbos.

if you plan to use 2 used factory turbos then get a turbo from a 2.8 to 3 liter single turbo setup. (280zxt or 300zxt, for example).
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Old 04-22-2010, 09:56 AM
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it means that like is now i can not put that mod ?
that engine is 10:1 compresion
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Old 04-22-2010, 09:59 AM
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go it guys can you help wish be my best choice in parts to make that mod ?
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Old 04-25-2010, 01:14 AM
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350 zz4 with turbo

Couple of things first to make it work. You have a carb on it? If you do, you will have to make it a blow threw carburetor. I have a holley on my custom 350 ZZ4 sbc and I made it a blow threw carb. It's alot of hard work but worth it. If you just bolt up a turbo and not modify carb you will never be able to tune it.

Second get forged rods and pistons. I don't think the regular crate zz4 comes with forged but not sure. If not your pistons will shatter from the quench force. I've done this and it will destroy your block internally.

Third dont go over 5psi boost if you just bolt up a turbo and not modify the ZZ4 motor.

I just recently bolted up a twin turbo setup from a supra that was customized and made all of the pipes, etc. It's a big time difference, but gets a litte hard to handle if you street drive.

Let me know exactly how detailed you want to get into building the engine with turbos and I can give you a good build guide and detailed parts.
Also depends on budget???
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Old 04-25-2010, 05:03 AM
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yes i have a carba quadrajet rochester 4 barrels
i change the rods and i install foger rod the pistons are normal hipertic speed pro
budget i will say 5000
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Old 04-25-2010, 06:56 AM
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With 44" tires in an offroad vehicle a mini blower may be a better choice.
It would be simpler also.
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Old 04-25-2010, 07:26 AM
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Kayca,

What the previous posts are saying is that:
1. You need lower compression to run a turbo, otherwise you will have engine damage under boost. You might get by with limiting boost, but lower compression is what you really need.
2. The engine's bottom end (rods, crank, pistons, etc.) need to be strong enough to withstand the extra horsepower. Your engine will work with a moderate upgrade, but may have problems holding up with a big increase.
3. Your fuel system has to be designed for blow-through pressure. You need a different carburetor, or a switch to fuel injection.

You could lower compression with different pistons, or by using different heads with a larger combustion chamber volume. Switching to a simple throttle body fuel injection system would be relatively cheap, or you could also try a carburetor designed for forced injection.

44" tires also lower your effective gear ration, and a turbo won't have power until it gets enough RPM from exhaust flow. You will need low gears and a high stall converter to let the system get into the power band of the turbo.

You might want to also look at a small supercharger, since I think the power would kick in faster than it will with a turbo.

Bruce
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Old 04-25-2010, 08:53 AM
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well this alot mod for my 350 and i may will lose all the parts that i will remove so guys do you know store that sell crate engine or some shop that made motors with some of that spec to run 44 tires so i can maybe see something the gears are no problem because is going to be a rockwell axle with 6.41
thanks alot for your help
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