How much Boost is safe on a stock engine.
 

From what I have seen and read 12 psi is completely fine on a stock engine and really if you want anymore power you have to get forged pistons and rods. Can a stock engine handle like 15 psi? If it can how well can it handle it. If you run 8 or 12 psi usually then boost up to 15 sometimes would it hurt?

I ran 18psi on my 1.6L for 2 years and 40k miles. It blew up when I spiked to 25psi...but I have no reason to not believe that it would still be alive today had that not happend. it had 110k on it when the piston just exploded and sent my #3 rod though the oil pan.

What about the 323 GT-X. How much boost did they come with from the factory?

323GTX had 7.9:1 pistons ( hypereutectic cast ) and beefier connecting rods ( ones I currently have in my 1.9L). the 323GTX seems to be able to handle 400whp otr 25psi whatever comes first.

Wait Andy did you run 18 psi on stock internals?

yeah, for 2 years.

wow 18psi on a stock 1.6! that's the highest I've ever heard for a car that actually had miles put on it. what turbo and how much power? what kind of engine management?

Combination of 2 turbos...one was a T3 S60 48/60. The other was a T04E 40 trim .48 stage 3 turbine. I ran the S60 for 1 1/2 years and the 40 trim for 6 months or so. I also ran a Greddy before that @ 15psi. Mind you I bought a lot of race gas to run these pressures...but thats when it was 3.30 at the pump. I ran 12psi 1/2 the time and 18psi the other 1/2 of the time.

This was on the same fuel setup I have now, minus the 330's...I was running 270's from a KA24DE. Engine was perfect until the day it died, still had 170-165-170-170 compression across the board ( 3 days before the engine blew ). If it wasnt for that 25psi spike in 4th gear I think that little 1.6L may still be kicking.

So Andy you think with an Fm II turbo kit I could run 15 Psi pretty easy? On stock internals. If I did I wouldn't do it all the time. Just whenever a mustang wanted to race :cool: haha

yeah hell he runs it with stock ecu a linked car can run 22 psi before the em runs out of head room normally past 15 psi there has been a tendecy for parts to weatr out according to FM but i dunno seems to be more of a maintenance issue.

Very interesting, and tempting. Unfortunately I will run out of injector by about 14-15psi. I'd love to pick up some 650cc's and a 3071R and some WI an see how far I could take the stock 1.6 on pump gas.

18psi, stock ecu, stock engine, 270cc injs...You don't really like to play by the rules, do you?:bowdown:

I ran 15 psi on stock internals with no difficulty. I know I was running 18 psi for a while, but I cant remember which motor I did it on. I think it was the built motor.

you where talking about 323 gtx pistons. Then have those in my car and everything is fine with 18 psi

So did I. :D It was 18 psi on a stock 1.8 with a CA spec FM-II however and put well over 13k miles, until an overrev killed the motor. Ric Stevens was running 24 PSI on a stock 1.6 junkyard motor.

I think a lot has to do with the fueling and tuning.....

so true - many a good engine has been killed well before 18PSI with poor tuning.

..... 12psi here...... muahahaaaaahaahahaaaa Posting dyno scans in a few minutes

where?

Rules are meant to be broken:bigtu:

AS well as records speed limits egos etc.