Jump to content
SAU Community

Recommended Posts

Hey guys, new to forum to please be easy if i screw up (could be posting in the wrong section for all i know)

Have picked up a R31 skyline (RB20DET, non-intercooled), she very nice to drive in the day.

Night or cold day is a different story.

When the turbo starts to spool it seems to jitter and/or lose power all together.

The car is always warmed up 5-10 minutes before hand, stalls while warming up.

I'm thinking spark plugs, i have a theory that in the day it's hot enough to get a good combustion, at night there is just too much air.

Could anyone shed some light?

Cheers.

Blake.

Link to comment
https://www.sau.com.au/forums/topic/446895-rb20det-not-boosting-at-night/
Share on other sites

I'm no expert on R31 but check everything related to ignition. Spark plug, coilpacks, coilpack loom, PTU ground...

Stalling during warm-up make me thinks it's PTU related.

Aren't the R31 PTU known to fail ?

AFM sounds like a serious candidate here.

Is it running stock boost? Does it have abig exhaust? etc etc etc etc.

No, stock boost, no intercooler.stock exhaust too, will be giving the AFM a clean today.

I'm no expert on R31 but check everything related to ignition. Spark plug, coilpacks, coilpack loom, PTU ground...

Stalling during warm-up make me thinks it's PTU related.

Aren't the R31 PTU known to fail ?

Not sure what PTU is, could you shed some light? and i thinks its a 32 rb20det swap.

cheers for the responding boys,

Blake.

R31 turbo not intercooled. Is this an Aus del with a 20DET swap or an import model. The only turbo 31's not intercooled were the import 20ET single cams or the unicorn like turbo GTS pace car. Afm sounds like the first thing I would check with a known working one. Which RB20 do you have if it is a DET. Redtop NICS are known be riddled with electrical issues, redtop ECCS or r32 silvertop RB20? If you can borrow a matched and working afm and ecu it would be a place to start and cost nothing to borrow for 20 mins.

R31 turbo not intercooled. Is this an Aus del with a 20DET swap or an import model. The only turbo 31's not intercooled were the import 20ET single cams or the unicorn like turbo GTS pace car. Afm sounds like the first thing I would check with a known working one. Which RB20 do you have if it is a DET. Redtop NICS are known be riddled with electrical issues, redtop ECCS or r32 silvertop RB20? If you can borrow a matched and working afm and ecu it would be a place to start and cost nothing to borrow for 20 mins.

hey guys was the spark plugs, whacked some new ones in and she runs pike a dream, last owner didn't intercooler it for stealth, definitely rb20det, cheers for the replys guys, also not sure what rb20 I have, anyway to check?

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


  • Similar Content

  • Latest Posts

    • Yea - I mean I've seen my fuel pump which is decades old and uh, while I'm not saying this with real knowledge... but I sure get the ick at using anything in the fuel system that produced the state of that pump. Many years ago I went through multiple pumps (and strainers) before I dropped the tank to clean it out with extreme violence. I'm talking the car would do maybe 50km before coming to a halt, which resulted in me cleaning out the filter with some brake cleaner and going on my way. None of my stuff ever looked like what came out of your fuel tank. I don't think I'd be happy with it unless every single component was replaced (or at least checked/cleaned/confirmed to be clean here).
    • I'm not going to recommend an EBC pad. I don't like them. Just about anything else would suit me better. I've been using Intima pads for a while now.
    • Agreed, and in particular the earth strap that should go from the subframe to the chassis but it often broken or left off. There is a section in the R32 workshop manual you can follow for troubleshooting if you don't see anything suspicious, and depending where you are (there is no location on your user profile) you should be able to get your hands on a second hand replacement unit still if needed
    • Yeah they mention as a R34 for 2.5 Turbo...but then again thos "small" were also for R34 by that different site. But i look into it and that 310mm EBC is for R34 GTT. And by those you linked the specs are the same 🙂    EDIT: I found these on one site here: DBA 4000 series T3 DBA42304S They are 310mm...and it says are for R34GTT...are there good? EDIT2: ok they have pads too.  What "color" should i get for street use? I dont want/need some noisy ones...(and if they are not that dusty that is good too)
    • Yeah, shame. Maybe  driver's carpet is available 🙏. I am waiting for both amayama and nangun to confirm.
×
×
  • Create New...