How much of a gain of HP and Torque for a 305 TBI? How much do turbos go for used?

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1992 Pontiac Firebird (stock)
- 5.0L V8 TBI / Automatic Trans / Every option, excluding leather
- Killer car audio system:

• Aiwa CDC-MP3 head unit
• Rockford Fosgate 360a2 amp
• pair of 12" MTX Thunder 5000s in a custom box
• Pioneer 3-way 6x9s, soon to add more more more!

 

the LO3 is not really prepped for a turbo. You can gain a lot of HP, im not sure on costs though, but certainly you woudl want to rebuild engine first.

 

Yeah, Lo3 isn't really up to turbo's. It would be hard enough to get the TBI and turbo's to work, let alone make any great power gains. You'd be much better off with a stronger platform. Take the time and put together a 383, you won't be disapointed.

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, Jon (350 TBI!)
91 Red My website

 

One Eye,

It really all depends on what amount of boost you are generating to shove down the chanmbers and cylinders of the 305. Any motor can be equipped to use turbos so long as it was running good to start with and is not high in mileage. A boost of no more than 8psi is recommended for a stock engine. Going higher, you'll have to strengthen the bottom end at a minimum. Pistons are the most fragile, followed by the rods and crank allthough seals, rings/gaskets can go also.

My best advice to you is to purchase a couple of fine books, "Maximum Boost" by Corky Bell and "Turbochargers" by Hugh McInnes that goes into much more detail than I can give you.

 

I second that!!!