next week my trans will be rebuilt. ive read that a lighter flywheel can decrease drivtrain loss. while the trans is out is it worth upgrading to an lighter flywheel. please list pros,cons, recommended brands or part numbers. and any other info reguarding this. thank you


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im also thinking about getting an aluminum drive shaft from a 5spd fbody. any input/info on that would also be appreciated


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Why don't you list modifications done to the car... This can help determine which way to go. I personally like a steel to store energy on launches but if you run plenty of gear it'll be fine. AL shaft is fine either way. Might consider going to SPEC for clutch and flywheel setups.

 

right now it is emmisions friendly stock. i have an ede. base, ported slp runners, ported plenum,and hedman lt headers. for this engine. a carbureted 406 might find its way in there before summer. i just want to minimize drivetrain loss


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I've never ran a lightweight flywheel, but if you do a search, you'll find lots of people DON'T like the lightweight flywheel. I can't elaborate too much, since I wasn't planning on going that route myself, but in my searching, I came across that topic several times.

....an aluminum drive shaft is definitely a good, worthwhile upgrade.

 

One more thing.... I assume we are talking about your 88 Firebird?? If so, you list an automatic in your info and by that, you won't be using a flywheel. Autos require flexplates. Not much choice there but a standard flexplate. You can get ultra-lites but I don't think it will make any difference on a street app. Stored energy is going to come from the choice of torque converter.

 

ugh im so sick of someone telling me something ,and then when i check into it. its bullcrap. a so called local trans specialist told me about this when i mentioned i was having it rebuilt. then gave me a quote 500$ more then my buds doin it for. anyways yes on driveshaft, no on flywheel/flexplate, is there anything else i can do to reduce drivetrain loss while my trans is out?


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Instead of doing research from people and their opinions, first do research from books. Get you some good hot rodding/modifying books that cover the basics of engines, transmissions, suspension, etc... Learn about your vehicle and all it's components.

A smaller diameter torque converter can reduce unwanted frictional weight as does the driveshaft. An example would be a Yank, Circle D, or Precision Industries who all offer the smaller diameter converters that get rid of frictional weight to help the engine be much more responsive.