Cone Filter, Detonation, Air/Fuel Mix
#1
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Cone Filter, Detonation, Air/Fuel Mix
Okay guys, help me understand… I removed the stock airbox from my car, and at the same time the P/S and A/C and all associated plumbing and brackets. I installed a cone filter on the front of my AFM, making an adapter to upsize the mount of the AFM to 3.000” (stock is 2.555”). I take her out for a spin, and the car was detonating (took me a while and another post to figure out that the VERY strange noise was indeed detonation, never heard anything like it before). I checked the timing and it was about 10 degrees advanced. I had never checked it before, but I had never heard the car detonate before either. Could it be that the new filter allows so much flow that the Air/Fuel ratio is now incorrect? Should I richen it up? How can I do this with the stock ECU?? I had to go to about 1-2 degrees retarded to get the detonation to completely stop. Is there anything that I could have disconnected that would have advanced the timing?? Thanks for all of your help!
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Well, I did mention that the timing was 10 degrees advanced. I just don't believe it was before. As for the wires, I am sure they are correct, and they were not removed!!
#4
Former Moderator. RIP Icemark.
Did you add a cold air box with the cone filter. Just bolting in a cone filter with all that hot air from around the engine and your timing advanced that far; pretty much would cause knocking/detonation right there.
#7
Former Moderator. RIP Icemark.
Originally posted by skyypilot
Well, my road tests were done in 45 degree weather, and it does it before the car is warm, and no I don't have a cold air box, that's next.
Well, my road tests were done in 45 degree weather, and it does it before the car is warm, and no I don't have a cold air box, that's next.
If the problem goes away, you'll know it is exactly what I said.
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#8
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set the timing to normal, and do some carbon removal. Pull off the vacuum line by the oil injectors I think, and put it into a bucket of water while the engine is held at 3000 or so. Go with a gallon or two. This will remove the carbon, lower your compression ratio, and hopefully stop the detonation.
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