bighead

iTrader: (1)

Hi guys , on a builts 2.5 with uprated rod, piston bearing etc etc,
fitted with P1 sti head with uprated valvetrain , will it safely rev past 7500 rpm ?? ...if so what would be the max safe limits on these?


cheers

Neilo

some people have revved then to 8k with no issues, limited use but hard use if you know what i mean. I fully intend to use mine to 7500 even with standard STI5 valvetrain (which is the same as what woudl have been in P1 heads)

bighead

iTrader: (1)

yes Neilo, we all know they will rev to 7500, but with uprated velvetrain I woulda thoughts they will rev same if not more than 8500

waiting for the gurus to reply now !

Neilo

well the answer youll get is "at your own risk" i reckon..........lets see

SSCJAY

I have been making some enquiries myself, obviously there are many factors to consider (Valve clearance, gas flow, fuelling) which will all determine how safe your engine is at high rpms.

I am looking at getting a 2.5 with Wiseco Pistons, carillo H beam rods race bearings, cross drilled crank, I was told that is would rev upto 8500 rpm if required but recommended around 8000 rpm for maximum reliabillity.

bighead

iTrader: (1)

btt

AndrewC

The question is why do you want to rev it to 8K?

p1mark

As Andrew says........

Power will be dropping like the hindenburg at that point so you are not gaining anything by revving it that hard.

New_scooby_04

iTrader: (4)

See the "How to get back at a spiteful neigbour" thread

Neilo

unless he has a GT40R strapped to it of course Think my 35 would be dying a death at those revs

bighead

iTrader: (1)

its not a question of "why " but a question of "can it "
a impreza can reach speed limits of 150 + but it does not mean you have to drive it at that speed