Spark Issues ?

[gL3nJaMiN88]

Hey guys took car out for a spin tonight and under full boost I get s spluttering sound and notice that I'm hitting 100% duty cycle around 2/3 of the time ?

Forged rb25det

Gt3582r @ 20 psi

Sard 550cc

Sard FPR (new)

Walbro 255 pump

Z32 afm

Power fc pro

[R31Nismoid]

Well clearly you are running out of injector flow...

[gL3nJaMiN88]

I never was before that's the thing it just came out of no where??

+ splitfite coils aswell

Only putting out 290rwkw

[R31Nismoid]

A 35R should be making a LOT more than 290rwkw @ 20psi. You'd expect around 340rwkw.

Clearly you have issues going on, probably a combination.

I suggest you go back to whoever tuned it and get it on the dyno to diagnose the problems. Could be a number of issues.

[gL3nJaMiN88]

Well maybe it's the fact my car was slipping on dyno and I've fitted new clutch on saturday and now it's getting all the power to the ground ? Shouldn't 555cc injectors support 350rwkw like everyone on forum states they can

[R31Nismoid]

They will support 330-350rwkw. But who knows whats going on.

You've fitted an aftermarket reg, it could be set wrong.

Fuel pump might be having issues, fuel filter even

As for the power you might have exhaust restrictions, timing could be wrong

Who knows mate. I think there is more to your problem and it's not coil packs at this stage.

Either way you must take it and get it looked at on a dyno, see what the fuel pressure, AFR's, boost etc is all doing.

[R31Nismoid]

Especially with your threads the past month, certainly issues

[gL3nJaMiN88]

Yeh I have a good exhaust setup 3.5 inch cat back and it's only a new FPR and pump , what fuel pressure is recomended ?

[StealthX]

Especially with your threads the past month, certainly issues

I may be barking up the wrong tree here, but does it pain you to talk/type in a friendly/non-threatening tone?

Yes, your posts are very informative, but you almost always talk down to everyone who has less knowledge than you, sorry just pointing it out.

[StealthX]

Yeh I have a good exhaust setup 3.5 inch cat back and it's only a new FPR and pump , what fuel pressure is recomended ?

should be 3 bar or about 43psi.

[gL3nJaMiN88]

All I want to do is ask people what the issue it but hey I just changed my plugs with a new set I had out back and now on 75% duty and no spluttering so thanks I fixed it myself

[gL3nJaMiN88]

And yeh she is running 44 psi is that ok?

[R31Nismoid]

Well no - it's still down on 50rwkw for the boost/setup you have.

So whilst you had bung plug, it doesn't explain the rest. Or why the plug was fouled in the first place.

I may be barking up the wrong tree here, but does it pain you to talk/type in a friendly/non-threatening tone?

Yes, your posts are very informative, but you almost always talk down to everyone who has less knowledge than you, sorry just pointing it out.

I was stating a fact - It was totally neutral.

Have a look at his post history. He's had a number of issues with the car of late.

If stating fact is a non friendly tone, well stuffed if i know what your talking about.

[gL3nJaMiN88]

Yeh well I'm not sure maybe the fact im running a stock exhaust manifold and intake manifold ?

[R31Nismoid]

Manifold only seems to be an issue on 3ltrs @ 300rwkw. People have made more on a 2.5l without issue.

Intake isnt an issue, 370rwkw isnt a problem

[Don Dada]

Wasnt there a consensus here that the exh manifold was good up to 300rwkw on a rb25 ???

[JonnoHR31]

imo it starts becoming a serious restriction at around 280-300rwkw on pulp. no one can give an exact figure for every car as they're all going to be different.

[W0rp3D]

And yeh she is running 44 psi is that ok?

That is the factory psi, since it is adjustable you may as well up it a little on your next tune to give your self more headroom and keep it safe.

Yeh well I'm not sure maybe the fact im running a stock exhaust manifold and intake manifold ?

Yeh I have a good exhaust setup 3.5 inch cat back and it's only a new FPR and pump , what fuel pressure is recomended ?

So judging by those 2 comments im assuming that you have factory manifold, dump, front dump and cat?

If so there is your problem, upgrade the dumps and cat first and see how it goes then do the manifold if needed.

[Tony de Wonderful]

100% duty cycle will break the injectors.

[SIR-032]

I may be barking up the wrong tree here, but does it pain you to talk/type in a friendly/non-threatening tone?

Yes, your posts are very informative, but you almost always talk down to everyone who has less knowledge than you, sorry just pointing it out.

I agree with your post 1000% because you are CORRECT 74 thousand posts that would Drive me stoopid also he does not think he talks down to members but he prooves it in his reply to ohwell

ive just wasted another 5 minutes of my time Grrrrrr