Reliable 250kw +

[R34GTFOUR]

how many km's do you think the engine has seen? a compression test of only 125psi is getting on the low side, i would guess the engine is getting tired so i would be careful, especially if you arent 100% on its history.

Just a thought since you want it as reliable as possible

[VB-]

numbers arent *that* important, consistancy is ^

[CeJay]

Engine was built at a tuning shop in japan, put in 8 years ago, I would suspect it has about 100k's on it, I was suprised at the low compression myself, but that being the case I thought maybe it had been built as a low compression engine? Idk, havent seen the internals, will be talking to a local shop about the work I want done tomorrow or on wednesday.

What's so special about not having the VCT? and it's implications re bigger turbos? Hadn't heard anything about vct being an issue before.

[joeyjoejoejuniorshabadoo]

the variable timing helps the car a lot on the low rev ranges, thus creating lots of lovely exhaust gasses which get your turbo up and running...

no vct = more lag

[R34GTFOUR]

numbers arent *that* important, consistancy is ^

yeah i know, most places say no more than 15% variance between each pot, i dont like more than 5% myself but meh...

but in saying that 125psi is very low for a rb25, i've done a far few compression tests on skiz's and the lowest i've seen on a "healthy" running motor is 140psi. If it was mine i would just keep a close eye on it.

CR and compression tests arent directly linked, you can have a 7.0:1 CR engine still pump out 160psi of compression, a compression test is purely how the pistons/ring/valves are sealing.

Not saying its a bad idea, but like i said the title did mention reliability so smashing a larger turbo on a stock tired engine might not work out the best for that part

[tridentt150v]

yeah vct ramps up your cam/valve breathing down low as jjjjs says, it overcomes some of the lag a bigger turbo would induce.