Critikul

Like the title says. I just got an eg hatch, with a built gsr. Itr crank, eagle rods, wiseco 9:1 pistons and jdm itr head. Anyways, when i got the car i did a compression test and all the cylinders read 190psi except for #2 that was 160-165. I know the inconsistency isnt good, but is it still safe to turbo it?

Sorry if this shld be in the tech section, but i wasnt too sure since its more of a boost question.

Thanks!

EsotericImage

iTrader: (8)

the rule is a 20psi difference.. i wouldnt do it. your only asking for trouble down the road..

MR.johnson

A good rule of thumb is to have less than 8%-10% variance between cylinders. not 20psi.

i dont really trust compression tests. do a leak down and go from there.
Good cylinder leakdown readings should be below 5-8%

op you have a problem after the leak down. fix it. then continue your turbo build.

Critikul

Alright, ill do a leakdown test in the next couple days and get back with the results.

Thanks for the quick response guys.

fcluddington

shoulda done compression test before buying. this low cylinder would have been something to negotiate in price, unless you got it so cheap it dont matter.
How does engine run?

any way 10% is 19psi. 190-20=170 psi so when you look at it like that you are 5psi off. I see this a lot on diff. engines and yes it is something to monitor, but I would not tear down until cylinder is close to dead. that is if nothing is damaged.
I would have not problem boosting this but monitor at the same time, you dont want to damage that ITR head.

EsotericImage

iTrader: (8)

I got my figures from Jeff Evans Tuning and my tuner when he did a test on mine..

but just throwing my .02 in..

"3 good doesnt make up for 1 bad"

SiRCiviC94

Soak the cylinder in oil a couple days and retest otherwise change the rings

MR.johnson

Lol. No, don't do that.

SiRCiviC94

Why the hell not? Ever heard of marvel mystery oil? I've freed up 40 year old boat motors that were seized let alone 20% off in compressing.

Worth a shot just a bit in the spark plug hole let it sit a day turn it over do it again.

MR.johnson

its not going to be an accurate test if there is oil in the cyl. this is a build gsr, not a damn 40 year old boat motor.

op my guess is a valve. do a leak down, dont put **** in the motor.

rich7777

Because its just a temporarily fix. As soon as the car has been running for 10 minutes or so the compression will drop back down. If the ring are shot or the bores are distorted then the problem needs attending properly.

Critikul

I traded my 04 cbr600rr for it. And i did the test before i traded, i just wasnt sure if 30psi shld be a deal breaker. The bike was worth around $4500, so i think it was a fair trade. The car is super clean, CF everything, wire tucked, alllll name brand ****.

It runs like garbage right now..Actually wouldnt even start last time i tried :/. It has old gas, 3 450cc injectors and 1 gsr, and doesnt hold fuel pressure for some reason. And i was told the map on the ecu is for break-in w/boost.. The guy i got the car from sold the turbo kit and injectors, and just put those in to show it runs..i guess. i just havent had the time to work on it lately. And of course im not going to drive it the way it is haha.

TravisBiggie

what kind of 450s? if they are blue you need a resistor, and **** having a different injector.

komat

lol did you really try to start it with 3 450cc and one 240cc....

SiRCiviC94

Woah hackkkked up I wouldn't trade till it ran as good as that cbr

racebum

x2

is the down cylinder the one that had the 240?

Turbo-LS

iTrader: (4)

I'm willing to bet that's the cylinder with lower compression. If it isn't it was moved or just thrown in once that cylinder 450 injector went bad

MR.johnson

and the whole story comes out lol.

EsotericImage

iTrader: (8)

Dc4LsTeG

iTrader: (7)

Spawne32

iTrader: (3)

Critikul

Whole story?? I just said the turbo kit got sold and those injectors were just in it to show that it would start. And actually NO, its not on the same cylinder. It has ran for like 15 minutes total with those injectors, and 0 miles. OBVIOUSLY its not good at all for the engine..im not an idiot. Troll elsewhere plz.

Critikul

& i really doubt the guy is gonna buy $4k+ in parts and machine work (which i have reciepts for) and skimp out on injectors.. probably the cheapest part on the engine..honestly lol. Buuut regardless, i have the car now..so talking **** about my setup isnt going to get me anywhere. All i can do is fix it and keep the build going.

fcluddington

Are you committed to getting car running, and just trying to figure out if it's worth it with the low cyl.? So you bought a car that used to be boosted and he sold all the turbo, injectors etc.

Did you ever here the car run when it was correctly put together or only with the mismatch injectors. Anyone who puts in mismatch injectors I would wonder about all the work they did especially 240's are about free. Now the 30psi low is getting questionable

non-VTEC

my 400whp+ turbo setup has been running on one leaking exhaust valve for 3+ years....yes it sucks but when its your daily driver and you have other responsibilities (house, wife, bills etc..) tearing it apart and spending money on a "hobby" isn't my first priority.

i get 200psi in 3 and 175ish on the one with a bad valve...but it still runs like a champ....maybe one day if i have extra money to burn i will repair it but for now i will just keep driving it as it makes little to no difference while driving.

to the OP...if it bothers you that much then repair it...it just really sucks that you bought the setup like that...