Highlander

I am using datamaster and every time I depress the accelerator I am getting some knock and retard... What is going on? Dont quite get it... Can someone help of this is common?
Thanks

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94B4C M6
Finishing project
Borla Competition--
AFR Heads
383 + Paxton Supercharger

Hal Fisher

Ok, you say decelerate in the subject but acclerate in you post. Which is it. Also post your fuel mods, rpm this is occuring, current timing settings and more info then just asking why.

Hal

Highlander

Sorry, for me depressing is decelerating... wrong translation from wron associations in different languages...


I am having around 42º advance and its occurring at many rpm ranges...

my fuel mods are an inline fuel pump for my paxton supercharger...

AFPR but is set at 43psi and I have 30# injectors...

CAJUN-Z

Paxton and 383 w/30# injectors? I think you may be a little lean. Since you're from PR, how's the quality of fuel down there (and what kind of octane rating are you running?). I think 42# injectors would be a required minimum...I could be wrong
I would pull a couple of plugs and see how they are burning. If they are "peppered" with aluminum particles, you're destroying your engine and need higher octane and/or fuel enrichment/reduced total timing...My $.02...

Highlander

I am not lean.. I have only 5psi boost and I have 93+ octane fuel..

I have a set of 3 siemens 34.8# injectors behind the throttle body... No lean condition yet, actually I am rich all over.

No detonation while accelerating and no metal on spark plugs... I am just seeing some knock when I let go of the accelerator... Could be some knock detected because of the high sound of the supercharger while decelerating since this kit doesn't have a BOV and when I decel the supercharger will actually sound a lot more than my car perse.

Hal Fisher

My hard disk crashed and took my tuner cat software with it. I haven't reinstalled it yet but the answer to your question is to reduce the amount of throttle closed advance. I believe your up around 42 which needs to go down. I think there is a way but like I said I can't see the software to point it out.


Hal

Highlander

Yes... there is a closed TPS advance table...

I thought that the DEFCO took care of all that...

Thanks