sr20det redtop compression test normal?

2

2hunidsx

New Member
hi, okay so im buying a 200sx sr20det and i done a compression test on it and here are the resaults:
125/125/120/125 cold crank, is this normal with the following engine mods? (mods done 5 years ago)

Greddy forged pistons
Forged H beam connecting rod
ARP head studs
Balanced bottom end
High performance cobalt iron rocker arms
TOMEI Oversize Oil Pan kit
Cusco Oil Catch Tank kit with custom made AN10 braided hose fitting
Custom made Inlet Piping kit
Z32 Air Flow Meter
Spitfire Direct Ignition system
 
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Seems pretty good for a cold test and all within 15 psi of each other which is a good sign.

For a proper compression test though run it up to temperature and then test it cranking with throttle wide open.

I would imagine to see them read 150+ then
 
What power figures do you reckon ill get? Greddy T518Z 8cm turbo
he says he makes 220rwkw on 17psi, can i push it furthur to lets say about 20-22psi safley? also with a upgraded turbo if needed
 
What CR were the pistons designed for?
And what thickness headgasket?

Seems a little low, normally closer to 150 on a good engine but if it's had lower comp pistons and thicker headgasket fitted (my guess it has) then that will drop the results.

Can run more boost to compensate, so the 17psi is akin to 12-13psi on stock compression. Sounds like the motor has been built to take 20+psi so if you've got the fuel headroom and tunability i can't see why not (unless you're clutch isn't up to the task)
 
Nismo 740cc injectors
Greddy trust oil cooler kit
Upgraded fuel pump
Power apexi fc,
You know all them supporting mods it has to many to list but yoy get the point, it had a full custom dyno tune aswell
 
So you don't know what compression ratio the pistons were designed for?

Wouldn't worry too much either way. Wind her up
 
If you dont know what exactly was tuned before, at least let a tuner check out the PowerFC and if necessary tune it.
Other than that, wind it up no prob mate with a good tune.

Its always down to the tune in the end if you have the supporting mods ;)
 
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