I'm currently running a blower with about 7.5psi on stock compression. (9:3).

Have any of the turbo guys here run their turbo(s) on the stock bottem? If so, how long did it last?

Eventually I know i will have to do a piston swap. Should I go flat and forged?

 

my motor has 8.0:1, stock pistons

i run around 17# on pump gas, once i get this thing tuned a bit better i'm sure i could squeeze another # before i get detontation

 

I went to forged JE 22cc dished pistons. They're just too beautiful to install





Marck

 

My wife wont let me keep mine in the house either

 

I've got JE's also with somewhere under 8:1(I'm thinking 7.6-7.8:1)and run 20-21#'s on 94 octane.

Steve

 

mine are 1.384" comp height dish top 4.155" dia bust out the calculator and guess what stroke/rod combo/CID it was made for he-he

 

I was running my twin turbo setup on the stock L98 for 2 years. When I pulled the engine last winter, I tore it apart, and nothing was wrong. All the ring lands were in one piece, cylinder walls looked good, no cracking, etc. This was with 5 psi non-intercooled and 8 psi intercooled. As long as you make sure to *never* get detonation, you'll be fine. Run rich (11.5 to 12:1 or so) and conservative timing, and you'll be set for a while

The new engine will have custom JE pistons - 27.5 cc inverted dish, 1.151" compression height for a .038 quench, and 8.25:1 compression. max boost will be 25 psi

Andris

 

I have TRW blower pistons with ported track 1 heads....i think its somewhere in the 8.0-8.2 range with a quench of .036-.039