lt170chevelle

iTrader: (2)

i have a 94 lt1 in my 70 chevelle and am in the process of putting a big turbo on it. my question is what parts need to be upgraded to last as a daily driver with 10 lbs on stock motor.can i get away with 1 255 fuelpump or will it need two? what about injector size? size on wastegate? is 2 1/2 piping on each side into turbo too big? should i go smaller for quicker spool? i have a small stall. and what about a cam what would be a good cam to help this turbo spool and make some decent power? thanks mako

96silverram

iTrader: (12)

10 lbs is way past the point of reliability on a stock bottom end LT1. You will be building a motor pretty quick I would say 6 or 7 to make it last any length of time.

lt170chevelle

iTrader: (2)

really? i ran 10 lbs on my mustang for quite a while...is the compression ratio an issue or is it just the bottom wont handle the power?

mightyquickz28

iTrader: (8)

The fox bodied 5.0 family came with a 9.x static compression ratio while the LT1 comes with very brittle 10.5 compression and a tiny combustion chamber volume of 54cc. The top ring land on the LT1 piston is fairly high too so the top ring land will crumble off fairly easily if you have too much cylinder pressure or detonation, both likely with 10 psi. THe crumbled piston shards will eat the turbine blades of your turbo on the way out too..

edcmat-l1

iTrader: (10)

LT1 stock pistons+10PSI=broken pistons. Ditto on the top ring land. Happens every time...

lt170chevelle

iTrader: (2)

so is 7 about as much as i should push it? i have the older style pre93 pistons in the motor now cuz of the price diff. do they happen to have any better ring lands?

mightyquickz28

iTrader: (8)

I'm not sure what difference that would indicate. You might have to measure them to actually know. The LT1 piston was designed with a smaller 'crevice' (area between the top of the first ring and the piston crown) to clean up emmision output so there is a chance your piston, what ever it is, could be beefier.