Jump to content
SAU Community

Thoughts On Compression Test?

Rb25guy

By Rb25guy,
in General Maintenance

 Share

Recommended Posts

Rb25guy Newbie

Rb25guy

Posted
Posted

Hey guys, I did a compression test on my RB25det neo. What do yous think?

Dry:

Cylinder 1 - 145psi

Cylinder 2 - 147 psi

Cylinder 3 - 152 psi

Cylinder 4 - 150 psi

Cylinder 5 - 150 psi

Cylinder 6 - 154 psi

Wet:

Cylinder 1 - 182 psi

Cylinder 2 - 180 psi

Cylinder 3 - 180 psi

Cylinder 4 - 175 psi

Cylinder 5 - 185 psi

Cylinder 6 - 180 psi

Couple of months back, my car use to only blow white smoke on boost/acceleration. Then after a while it was getting a lot of knock, like 160+ on my power fc hand controller, but only while on boost. It was fine driving normal and I only boosted it every now and then to see if it'll still knock after changing some things, hoping it would have stopped knocking.... but it didn't. So I stopped driving my car altogether to prevent any further damage I could be doing.

And now when I turn my car on it constantly blows light blue smoke while idling or driving. I take my car for a little drive around my complex evey 2 weeks or so. I haven't boosted it but I'm guessing it'll be knocking and smoking even more than before.

Any thoughts? Thanks for reading.

Link to comment
https://www.sau.com.au/forums/topic/463039-thoughts-on-compression-test/
Share on other sites
admS15 Grand Master

admS15

Posted
Posted

The compression results seem reasonable for the age of engine. The variation isn't drastic at all. Not sure what is causing your smoking issues. I take it the fc is running the apexi maps. You shouldn't be putting it under max load when its untuned, especially since it was registering such a high knock count.

Rb25guy Newbie

Rb25guy

Posted
  • Author
Posted

The car was tuned by previous owner at mercury motorsports. Only started smoking and getting high knock at boost mid last year. I've bought a standard rb25 turbo in good condition and will put it in when I get time. Car still drives fine when I do drive it. Just the smoke and knocking.

The car is burning oil and I'm guessing this is why it's knocking? If the turbo doesn't fix the smoke and knock, I'll probably have to pull the head out and have a look inside the engine.

Anything else I should and or shouldent be doing?

Hadouken Grand Master

Hadouken

Posted
Posted

Yes. I believe you should firstly stop driving the car until you fix this oil leak and then get it to a tuner asap.

To add to my other post. Yes you are probably experiencing detonation or pinging. That's probably why your engine light is flashing on boost

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      Cheers. Skyline is back on the menu, can’t get rid of it. It’s like a child you don’t want, or herpes 
    • Dose Pipe Sutututu
      From Japan and back to Europe, my sh*tbox R34 GTT

      By Dose Pipe Sutututu · Posted

      Welcome back brother 
    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      I got back to Japan in January and was keen to get back on track as quickly as possible. Europe is god-awful for track accessibility (by comparison), so I picked up a first-gen GT86 in December just to have something I could jump into right away. The Skyline came over in a container this time and landed in early January. It was a bit battered after Europe, though—I refused to do anything beyond essential upkeep while it was over there. The clutch master cylinder gave out, and so did the power steering. I didn’t even bother changing the oil; it was the same stuff that went in just before I left Japan the first time. Naughty. Power steering parts would’ve cost double with shipping and taxes, so knowing I’d be heading back to Japan, I just postponed it and powered through the arm workout. It took a solid three months to get the car back on the road. Registration was a nightmare this time around. There were a bunch of BS fees to navigate, and sourcing parts was a headache. I needed stock seats for shaken, mistakenly blew 34k JPY on some ENR34 seats—which, of course, didn’t fit—then ended up having the car’s technical sheet amended to register it as a two-seater with the Brides. Then there’s the GT86. Amazing car. Does everything I want it to do. Parts are cheap, easy to find, and I don’t care what anyone says—it’s super rewarding to drive. I’ve done a few basic mods: diff ratio, coilovers, discs, pads, seat, etc. It already had a new exhaust manifold and the 180kph limiter removed, so I assume it’s running some kind of map. I’ve just been thrashing it at the track non-stop—mostly Fuji Speedway now, since I need something with higher speed after all that autobahn time. The wheels on the R34 always pissed me off—too big, and it was a nightmare getting tires to fit properly under the arches. So I threw in the towel and bought something that fits better. Looks way cleaner too (at least to me)—less hotboy, less attention-seeking. Still an R34, though. Now for future plans. There are a few things still outstanding with the car. First up, the rear subframe needs an overhaul—that’s priority one. Next, I need to figure out an engine rebuild plan. No timeline yet, but I want to keep it economical—not cutting corners, just not throwing tens of thousands at a mechanic I can barely communicate with. And finally, paint. Plus a bit of tidying up here and there.  
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Nope, needed to clearance under the bar a little with a heat gun, a 1/2" extension as the "clearancer", and big hammer, I was aware of this from the onset, they fit a 2.0 with this intake no problems, but, the 2.5 is around 15mm taller than a 2.0, so "clearancing" was required  It "just" touched when test fitting, now, I have about 10mm of clearance  You cannot see where it was done, and so far, there's no contact when giving it the beans Happy days
    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      It's been a while since I've updated this thread. The last year (and some) has been very hectic. In the second-half of 2024 I took the R34 on a trip through Germany, Italy, France and Switzerland - it was f*cking great. I got a little annoyed with the attention the car was getting around Europe and really didn't drive it that much. I could barely work on the car since I was living in an inner-city apartment (with underground parking). During the trip, the car lost power steering in France - split hose - and I ended up driving around 4,000kms with no power steering.  There were a few Nurburgring trips here and there, but in total the R34 amassed just shy of 7,000kms on European roads. Long story short, I broke up with the reason I was transferred to Europe for and requested to be moved back to Japan. The E90, loved it. It was a sunk cost of around EUR 10,000 and I sold it to a friend for EUR 1,500 just to get rid of it quickly. Trust me, moving countries f*cking sucks and I could not be bothered to be as methodical as I was the first time around.
×
×
  • Create New...