Misfire

[jazza08]

Hey peeps

I was curious if there is a quick fix for my problem.

When i get to full boost (18-20psi) and change hard from 2nd to 3rd and the gate goes to close then re-open it stutters, its like a mis-fire... Sometimes it wont do it if im abit easier on the change or it will never do it if im not on full throttle when i change.

It goes full throttle, change, power on, stutter, power on as normal till redline in 3rd.

Any ideas??

Never does this from 1st to 2nd, and it hasn't from 4th to 5th either.

Ne replys would be cool!

Thanks all

[GTAAAH]

i have the same problem and always from 2nd to 3rd as well, sometimes it doesnt happen but sometimes its massive

hoping some one solves the prob for u;

[jazza08]

Well that makes two of us who'd like some help hehe

Mine never did it on stock turbo, i think it cud have somethin to do with the external gate... im not quiet sure!!

[700HP-GTR33]

Well that makes two of us who'd like some help hehe

Mine never did it on stock turbo, i think it cud have somethin to do with the external gate... im not quiet sure!!

There must be a pressure build up ,changing the gears has nothing to do with it. Taking your foot off the pedal quickly at high boost levels has.

Do you both run front pipes and pods?

I believe they are to small for the turbo's and the boost levels you are running.

The air is sucked in at maximum boost and then shut out,

If your pipes are not large enough a vacuum can form which tries to spin the turbo's the other way,once they try to spool again.

This would happen if you are using standard air boxes and larger turbo's with higher boost.

The other problem can be in your blow off valve and how effective it is. If you have one that is?

These help the turbo's release unwanted air through a wastegate at gear changes or really

between gas pedal intervals.How well have you installed these? If you have none then pressure builds up and a vacuum once again might form especially at high boost levels.

Last but not least you have timing problems,answer is easy to that one, get a tune.

I hope i have helped in some way.

Cheers

Tekin

[Busky2k]

You sure its not overboosting on the gearchange (ie when you mash the throttle again)? This happened to me a while back and it'd misfire for a split second.

[jazza08]

boost control is not a problem.

Thanks for that response GTR33 , my bov is sh*tty and i have a stock intake pipe, both of which are going to be changed at some stage!

I had a thought about the bov... that could def be the problem