Right i was on the motorway in 5th put my foot down abit the ignition cut out for about a second then the car backfired then carryed on going could this be an overfueling problem plus sometime it feels like it holds back on boost sometimes it will boost at about 9psi and hold then others it will boost up to about 9psi then drop and hold 6psi anyone know what might be the problem

 

What's the spec of the car, is it chipped? Info is always helpful

Sounds like a boost spike to me and the ECU cutting the ignition.

 

Almost standard only a k&n ,s/s, -31,dont think it's been chipped ain't had the ecu apart to look

 

Then I go with my first answer for now

 

how do i get that sorted then tony

p.s just been looking at the build looks fuckin

 

Thanks


Best thing is to turn the boost down a bit and see how it gets on. You using a bleed valve? Piece of piss if you are.

If the ECU senses 10psi boost it'll cut the ignition.

How old is the actuator?

 

No bleed valve looks like it's time to get under the car and wined the actuator out abit dont know how old -31 is but it was doing the same sort of thing with the old standard actuator on just was'nt cuting out and backfiring just holding back sometimes so thats why i put the -31 on cos i thought the old one might be fucked as the boost seems to be all over the place

 

deffinatly a boost cut problem! i had a standard ecu on the other day, boost cut at 10psi!

 

Checked all the boost hoses there all fine wound out the actuator a bit as it was going higher than i first thought (so that's probley why it was cuting out) had no cutout or backfire (yet) but the boost is still going up and down it goes up to 9psi then back down to 6psi and holds at 6psi as it was before i wound the actuator out so it seem's that all it want's to hold is 6psi any idear's people could it be an ecu problem

 

sounds like the overboost protection kicking in

 

something to remember boost gauges are rarely spot on when apt tuned mine they installed their own nomad boost gauge along with mine and theirs was reading 2-3psi more than my cheap and chearfull 30 quid one!, so u could be running more boost than u think and hitting the 10psi limit, also your ecu will get the boost pressure quicker than your boost gauge will read it, had the same problem with mine when mine was standard, set mine to 8 psi still cut out, i know now why coz it was really running 10psi!

pick up a chipped ecu and it will be fine

 

It's not cuting out anymore and the actuator is wound out a fair bit it's sort of peeking at 9psi then going down and holding at 6psi no matter weather i wined the actuator in or not it just seems drop and hold at 6psi dont think it's running anywhere near 10psi as it dont feel like it anymore help would be appreciated guy's

 

it will never hold 9 psi anyway, rst's can never hold air in, on mine peaks at 21-22psi but hold 17psi, and everything on my engine is basically new!

 

no matter how much i wined the acutator in or out it just seems to hold 6psi shorly if i wined the actuator in it should peek higher and hold higher

 

That all depends on your set up and where the boost pipe are connected etc. I see you have a GRS, have you got one of your boost pipes going to your cross over pipe?

Back in the day before I had my boost controller, my GRS used to loose 4psi from peak to hold, went for the cross over mod and it didn't drop anymore, and I still use this meathod now. Basically the air going through the throttle body holds the actuator open.




Best picture I had to hand.

 

yeah i know it depends on setup, but the car in question is standard, thats why i susgested it to him

As on mine, i dont run that extra pipe yet!, hence why my boost drop, where abouts does the other end of the extra pipe connect to? the actuator?.