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Rb25det Popping Sound Around 5000rpm

O.I.C Napster

By O.I.C Napster,
in Engines & Forced Induction

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O.I.C Napster Collaborator

O.I.C Napster

Posted
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Guys,

I got a r33 gts-t 1994 and when i put the foot down in pretty much any gear about 4000rpm my car starts popping when the revs are going up on full boost. The boost stays the same bit it feels like it surges then back on surges then back on right up to redline...

Would this be a fuel pump or maybe even coils

Im running a stock bov, fmic, cai, and a standard ecu.

Ive have it into a mechanic and they still cant seem to find anything worng with it. (maybe they not as heavey footed as me.

Mind u on 5psi it wont pop only on 10psi it will.

If any of you can lend a falla a hand i thank u in advance

Cheers Matt

O.I.C Napster Collaborator

O.I.C Napster

Posted
  • Author
Posted

BTW i just had a dyno run today came back with 150.7 (stink i know) but around 125km in 4th the line dips and again at 134km it dips again then again at 148km/ph and the guy sasid he fixed it.

IM CONFUSED!!

Cubes Grand Master

Cubes

Posted
Posted

0.8mm plug gap.. if that no fix rip the center coil cover off, take the car for a spin to get it hot then come home and carefully look for little flashes of light around your coils.

If they flash your coils are nackered and u need new ones. :P

rob82 Mentor

rob82

Posted
Posted
BTW i just had a dyno run today came back with 150.7 (stink i know) but around 125km in 4th the line dips and again at 134km it dips again then again at 148km/ph and the guy sasid he fixed it.

IM CONFUSED!!

Check your fuel pressure regulator has its vacuum source on. If the dyno shop gave you a printout of boost and power they would've taken it off.

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

ive seen this happen as well.. .7 can also help so try that before looking elsewhere.. in my case i went to .6 :)

no gap the plugs to .7 m i gap my mate to .8 slight improvment but when gaped at .7 the whole mis fire went away
O.I.C Napster Collaborator

O.I.C Napster

Posted
  • Author
Posted

Well i just looked at all the coils and found a little hairline crack, so i had a read of the following topic:

http://www.skylinesaustralia.com/forums/in...56&hl=coils

and wala did what it said. took the coils out looked at them with a magnifying glass and found a small crack, used pvc tape and sweet i have boost again right to redline. Maybe only a temp fix but saved me $$$ on coils i didnt really need quite yet.

Cheers for ya help

Matt :)

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