Too low SA cause knock
08-14-2014, 02:06 PM
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Car: 1988 Iroc-Z Red T-tops
Engine: 305 TPI LB9 55k miles
Transmission: Auto 700r4
Axle/Gears: 2.73 posi
Too low SA cause knock
After tuning my inj constant and get 128 across the board I was surprised to still see knock, even more in the 144-208 range during PE.
Car runs better and I know fueling is better then before last tune. O2 at PE is 1000flat. SO I kept taking a little fuel out. it doesn't seem lean. I am going to add like 25% more fuel in PE to be safe and see if it impacts the knock.
Now I removed the SA for PE to zero and I lowered the SA in the 2000-4000 above 144 to all 22degrees. I am wondering if that is too low and if too rich on top of low spark can cause knock?
Car runs better and I know fueling is better then before last tune. O2 at PE is 1000flat. SO I kept taking a little fuel out. it doesn't seem lean. I am going to add like 25% more fuel in PE to be safe and see if it impacts the knock.
Now I removed the SA for PE to zero and I lowered the SA in the 2000-4000 above 144 to all 22degrees. I am wondering if that is too low and if too rich on top of low spark can cause knock?
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