how much psi can the stock motor hold?
 

does anyone know how much psi the stock motor can handle? im at 340whp at 11psi on e85 and im wanting to boost 20psi but im not sure if its a good idea or not

When you find the limit, let us know.

I've seen a lot of engine failures around 20k miles with boost, I wouldn't suggest putting much if any at all. There's a thread with a list of them.

All of which were reported with either bad tunes, improper supporting mods or just waaaay to high of boost. On pump gas 10-11psi seems to be the "safe" limit (with) a good tune. E85 14-16psi (with) a good tune and of course supporting mods in place day one.

Folks who have a good tune stay within respectable levels seem to be having zero issues. WHP wise under 300 particularity seems to work just fine with stock internals

You're out of your mind if you think this motor can hold 20 psi without support. I am starting to question this motor's reliability based on people's experiences on here. I have read the engine is very stout yet no objective data on this after seeing people with issues without boost. This motor was not intended to be boosted in my opinion. But if you do it right you can bump it up. Forged rods, pistons, HD clutch, etc.

There are plenty of people on here with variable experiences that can provide better input than me.

about 40psi

Interesting question! I know very little about this, but I think I can safely say, it depends on how long you want your motor to last.

Fullblown made 600whp on stock motor. Im at 380wtq and 450 whp at 9,000miles. Theres a guy near atlanta at 579whp and a guy in alphareta with 529whp. I know of them through facebook groups i think its dipstik sportec and sportsguy83 but im probably confusing real people with ft86 usernames. Lexusb was over 500whp as well and i think he was at 24,000 last time he posted. Oh and this motor was built specifically to be boosted, hence the fa20dit only having slightly lower compression and around 300hp. So if the factory build one at 300 im sure 350 isnt pushing it too much on pump gas with a little bit more compression but with a better turbo and tune. Im not scared of 400whp on e85 at all.

PSI is not as good a measure. CFM is what you're looking for.

I'm not boosted, but I know we have a few turbo / Supercharged running around my local meetup chapter. We have most pushing 320-350whp, I believe (uncertain of tq) but I know we have at least one at 400whp running E85.

He's run into some other issues though along the way. like the tail wants to step out under full throttle in a straight line. That and traction control just gives up. almost like it says "Too much power, fuck off -- I quit"

I'm personally going to be going N/A and aiming for around 230-250 and hoping for tq around 190-230. -- reason I want N/A is because I won't ever use 4-5-600 hp. But I will always use ~250. (personal pref I guess, though I have been considering a lower output SC build out just for the fun & simplicity of it)

21psi is the highest I think I've seen. I'm sure there's higher out there.
http://www.ft86club.com/forums/showthread.php?t=59784




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Purely curious. You really think the motor for our platform was built to handle boost? I know the DIT is the same motor for the most part. And that Tada wanted the purchaser to do what they pleased with the car. Just wasn't sure boost was part of his equation or not. Curious for more details from you. Thanks.

I'm on 13 now

Its never gonna happen you can keep dreaming with those numbers and staying NA