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Help with knock.

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jerrad

Member
Joined
Aug 21, 2004
Messages
534
I have a razor kit and I've never had any knock until today. I'm only running 22#s with 22* timing in 1/2 and 18*timing in 3/4 with erics chip. The blue knob is at about 3:30 and my fuel pressure is at 43 with the line off. Do you think it could be false knock? At first i started to knock a little after the 60ft then I turned the blue knob up a little and it quit knocking in the begining of the run and then started knocking at about the 1/8 mile. Any help would be great.
Thanks
Jerrad
 
If it didnt knock before and now its knocking.. something has changed. You need to go through the systems on the car(fuel,alky,ignition) and see if something is now different. And try to refrain from hi-boost until all is well.

Had a customer a few weeks ago that the plastic tube going to the 3 bar had split on the bottom.. and when he went into boost.. the system would come on but now not deliver the correct amount becuase the MAP wasnt seeing full pressure.

My suggestion as easy rule of thumb is look at the alky tank, it should be going down. If it is.. more than likely the alky is working. The test button should work as it did when the system was first installed. If it does.. more than likely the alky is well.

You didnt put information as to O2 numbers. If theyre crashing.. or EGT coming up hard.. see what I mean :)

Point is with 20 year old cars... you have to be on top of them. And things like coil packs, ignition modules, fuel pumps(dont care if theyre new), fuel filters, engine mounts, etc.. can create knock issues.

Drop me some better data. And when you do your testing, try not doing it from a dig.. as too many things come to play. IE, manually put the car into second gear, bring the rpms up to 3-3.5K.. roll into the pedal.. and watch the knock/O2's as the boost comes up. Slamming the pedal down all of a sudden.. never know what ya gets ;)
HTH
 
The only thing that has chnged is the temp outside. Last time I raced it was high 40's and yesterday it was high 60's. My EGT was mid 1400's so I know I am rich but then I turned my FP and alky up to try and stop the knock and the egt's went to 1722 so I think fuel was burning in the exhaust. I'll check the vacume line going to the MAP tonight. Thanks
Jerrad
 
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