most PSI

[xxxr6t]

whats the most PSI you have put into a stock bottom end and how long did it last for?

[NUT347]

36.5.

Lasted 2 lIght years.

[boostedbb]

37 - 40psi lasted over 1,000,000 kms mostly highway use

[apoc]

0 - cos I haven't got a boosted falcon yet. Lasting 400,000 so far.

[EFFalcon]

most i've run was 11psi, no issues to report.
but theres a lot that can be done to 'assist' a stock bottom end, such as head shims/double gaskets, E85, water/meth injection.

so the answer will be different depending on a lot of factors.

[Mr_4.0]

4.... Or 7....

[Mr_4.0]

Yer give us some more info OP please. Will aid in our answers.

[needfordspeed]

10psi, it lasted less than 600kms

[Dansedgli]

Depends how you define the "end" of an engine.

[xxxr6t]

a bloke i know has a eb with 15psi head work but untouched bottom end
so my brother started a budget build or should i say ghetto build he is running 18 psi and getting 246kw all that we have done to it was the double head gasket it seems to be holding together for now anyway
he wants to add nitrous and i think he would be pushing it to far

[xxxr6t]

its done about 1000k's so far

[EFFalcon]

18psi for 246rwkw just shows there are some big restrictions.

[needfordspeed]

18psi for 246rwkw just shows there are some big restrictions.

Yeah exactly, unless he has a tiny turbo

[EFFalcon]

did say ghetto build, so you could be right.

[xxxr6t]

its a vl turbo and i think it leaks

[needfordspeed]

That explains it lol

[TROYMAN]

ive run 12psi for 3 years now...

[Mr. CVE]

10psi, it lasted less than 600kms

That is a cool pic !!
Did you notice any blowby !!

[AaronEF8]

Does anyone remember the constant threads back in the day saying stock AU motors could handle 32psi?

[Dansedgli]

AU motors are better for boost. lol

[benhards11]

10 psi running 1.5 mm head shim standard computer, standard injectors, rising rate fuel reg.. 6 yrs no problems and had a very hard life.. 2 x t5s though , and a diff

[Rollin]

15psi, 424rwhp, massive, massive thrashing on a race track, in summer, with a carload of people, approximately 8 days.

[Fritzz]

I run anywhere between 12 and 22psi on my stock bottem end .. lasted over 40000kms and probably the last 15000kms it was running 18psi permanently and had around 600rwhp .. was still ok when i pulled it out

[eabaturbo]

ran 22psi through ea race car on a 130,000km ef bottom end....did lots of dyno time and about 200 1/4mile passes with a best of 10.1s. only engine mods were regrind cam, valve springs & au mls head gaskets. Only died when it had a hiccup with fuel pressure... piston looked a lot like needforspeed one.

[XR_Lightning]

18psi for 246rwkw just shows there are some big restrictions.

yeah sounds like SNR spec power/boost, wont be long till it blows and throws a leg out of bed

[xxxr6t]

yeah sounds like SNR spec power/boost, wont be long till it blows and throws a leg out of bed[/quote]

i hope so iv told him it would happen and its not so its making me seem like i don't know what im talking about
i mean for fk sake the oil catch it a coke bottle