This has to be a chip issue, checked all other possibilities. Every time i put the boost up to 14psi i get det over about 5k rpm?? 12psi is fine?

 

I ehink its got to be worth trying another chip. I currently have one from a forum trader but was thinking of a JD Chip??

It is air ratio to fuel ratio, not fuel to air and it does look ok crotch, but to be thruthful it would do no harm to check the fp particularly as you have problems?

 

Just like what your gunna do for me :D

obviously not enough fuel which requires extra boost.

 

do you have upgraded injectors?

Z32, do you mean extra boost needs more fuel rather than vice versa?

 

If you compare to SMW's AFR plot on the previous page, James' looks very rich, I wouldn't expect lean AFR to be the issue. Was it detonating when the dyno run was made? Have you confirmed all injector connectors are good? You may have one dropping out occasionally. If the problem is limited to 1 cyl then the plug from that cyl will look different, check for a clean, glazed appearance of the firing end and possibly tiny 'blisters' on the ceramic insulator - that should at least narrow it down to the offending cylinder.

 

Cheers

 

H

Z32, do you mean extra boost needs more fuel rather than vice versa?

 

If you compare to SMW's AFR plot on the previous page, James' looks very rich, I wouldn't expect lean AFR to be the issue. Was it detonating when the dyno run was made? Have you confirmed all injector connectors are good? You may have one dropping out occasionally. If the problem is limited to 1 cyl then the plug from that cyl will look different, check for a clean, glazed appearance of the firing end and possibly tiny 'blisters' on the ceramic insulator - that should at least narrow it down to the offending cylinder.

 

Cheers

 

H

 

I believe they are ok. I changed all the sparkplugs a couple of hundred miles ago. THere was one plug a bit oily on the thread (closest to passenger seat) but the rest were ok. Yes It was detonating when the run was made. I am going to try a different chip as the one i have may be a bit 'aggressive' for my needs. And also i'll check the fuel pressure,

 

Is this done with a T piece and running a guage somewhere you can see it?

 

Mark, what should the pressure be??

SMW had the same prob with his, the bloke at SRR said his fuel pressure was well down on what it should have been

check the pressure with a gauge teed in between the fuel filter and metal pipe attached to the top of the plenum, think it's supposed to be 42 PSI at idle but get confirmation of this..

Z32, do you mean extra boost needs more fuel rather than vice versa?

 

 

 

 

obviously not enough fuel which requires extra boost.

 

 

 

yes sorry mate, ment to say....

 

obviously not enough fuel which required by extra boost.

 

need to get the balance of air and fuel correct.

 

too much air (increased boost) not enough fuel.

 

my asumptions, im not a mechanic or anything sorry! :)

I have the same Problem, If I understood it right (austrian, bad english).

Mine goes into safety boost when I rev it over 5000.

Right now we change the knock sensor, hope, it caused the problem.

At http://www.conceptzperformance.com is a description, what happens, when the knocksensor

is damaged. Thats why we change it, don´t have any idea, what else it could be...

 

We worked till 1.30 am, now I´m starting to work again :(

I have the same Problem, If I understood it right (austrian, bad english).

Mine goes into safety boost when I rev it over 5000.

Right now we change the knock sensor, hope, it caused the problem.

At http://www.conceptzperformance.com is a description, what happens, when the knocksensor

is damaged. Thats why we change it, don´t have any idea, what else it could be...

 

We worked till 1.30 am, now I´m starting to work again :(

 

As i understand it the knock sensor doesn't function over 3000 rpm, so it couldn't be that. Theres too much going on in the engine for it to sence detonation.

As i understand it the knock sensor doesn't function over 3000 rpm, so it couldn't be that. Theres too much going on in the engine for it to sence detonation

It does function but at a much reduced level