Boost!

[mat277]

Hi i have a small problem. I have a Rb25 and the higher the boost i run my car coughs and splatters, it runs fine on standard 7 psi. I have no idea why this is happening. Does anyone know what is wrong?

[lachlanw]

your coils are f**ked and so is your search button . use the latter to fix the former

[mat277]

your coils are f**ked and so is your search button . use the latter to fix the former

Thanks buddy

[PM-R33]

Your problem is called "missfiring". If you do a search on these forums (or even on Google) you will get a better understanding of what it is and how to solve it.

It could be as simple as needing new/lower gap spark plugs or replacement coilpacks.

[mat277]

Your problem is called "missfiring". If you do a search on these forums (or even on Google) you will get a better understanding of what it is and how to solve it.

It could be as simple as needing new/lower gap spark plugs or replacement coilpacks.

thank you i will have a look

[-_-StRyDeR-_-]

or just run it on 7psi as thats what your current setup is best at.

Unless you start upgrading different items.

[Shazza24]

It is also luck of the draw if you have std ECU as sometimes putting up boost will result in a loss of power, which happened with mine. Yes this was proven to me on a Dyno, and you may not end up a clean power curve especially in higher RPM's (R&R).

[Birds]

If it is perfectly fine at 7psi then it's not a misfire, I very much doubt it anyway. You're hitting R&R - some ECUs don't like more than factory boost. Only way around this is to get an aftermarket or piggyback ECU and tune the car for the higher boost. Do some supporting mods for it too.

[PM-R33]

Nah it will be missfiring if he is saying its coughing and spluttering, mine was the same when it was stock. Was fine on stock boost, as soon as we put it up to 10psi it kept missing and had to go to .8 plugs with the factory coil packs which were dying.

[mad082]

phil is right. it will be a missfire caused by a weak spark. once you wind the boost up the spark can't ignite the fuel due to it being weak. start by pulling out the plugs and checking the gap on them. if it is 1.1mm then gap them down to 0.8mm (or put a new set of copper plugs in pre-gapped at 0.8mm) and see if that fixes the problem. if it makes it better but doesn't fix the problem then you will need a new set of coils.

[mat277]

It is also luck of the draw if you have std ECU as sometimes putting up boost will result in a loss of power, which happened with mine. Yes this was proven to me on a Dyno, and you may not end up a clean power curve especially in higher RPM's (R&R).

Thanks heaps for that, ive got a few more things to try but i will put that on the list if all else fails.

[Shazza24]

That's fine, but yea try what mad082, PM-R33 and lachlanw said to try. After all they probably have wayyyyyyyy more knowledge/experience than me. BTW search function is pretty handy as most topics have already been covered.