Jump to content
SAU Community

Recommended Posts

well i got my rb25det r31 and it free revs well.

But once you put load on it driving it starts to rev and then breaks down and wont rev, and starts backfiring as if it was a limiter noise...

when you change gears the bov makes a high pitched whistle instead of the normal rb25det bov noise, but thats in 1st and 2nd but from 2nd to 3rd and 3rd to 4th and 4th to 5th it makes the normal noises...

and when you do the limiter revving under load noise when you put the clutch in the revs drop down then it revs back up

free revs all the way out but wont rev under load

what could it be?

Link to comment
https://www.sau.com.au/forums/topic/160907-rb25det-breaks-down-under-load/
Share on other sites

coil packs or spark plugs. there are a few different fixes for the misfiring problem.

#1 - gap your spark plugs to .8mm (do that if not already done)

#2 - fix your coil packs, there are a few threads around on how to do this.

as for the bov sound, im not too sure if this fits the sound you described but it might be turbo chatter, where your bov doesnt actually open, the noise you're hearing is the air passing back onto the turbo blades.

Hey you are reading my mind but about four months earlier, If you have played with intercooler and a boost controller on the car you would have noticed that a nipple would be missing on the inlet part of the pipe before the bov that is the vacuum pipe that opens the actuator on the internal waste gate and if you dont have that hooked up you will hit max load causing seveire breakdown at 2k trust me i had the exact problem!!! easy way to fix it is to simply put a T valve in on the blow off valve hose that goes to near the back of the plenum!! that will get rid of your break down at 2k.. P.M if ya want a photo!

made a slight difference but still breaks down, but you can get past the banging and then it tries to pull.. could it be a fuel problem?

but what concerns me is, i gave it a boot full and then went to go into my driveway, stopped and the car stalled, then i started it again and it stalled again but started it and gave it a rev and it idled fine...

its quite farken easy u see...

u get a gapping tool, pick the gap u want, get ur spark plug out, tap them on the ground softly until the gapping ruler u are using fits between the sparking element and the underside of the tip. ur spark plugs come pregapped at 1.1 thats not enough for boost past 6-7psi. that will work, if ur unsure how to do it, go to ur mechanic.

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

    • It is a kunfine Android screen . Does anyone know the wirering diagram of the fuga ??
    • just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Awesome, thanks for sharing!
    • To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
×
×
  • Create New...