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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

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.

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 :rofl:

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