#2295 - 01/19/0804:10 PMRe: Killing of Engine Knock
[Re: teamzr1]
Joined: Dec 2000 Posts: 5,854teamzr1 Owner - Pays the bills
teamzr1 Owner - Pays the bills Lives in Engine Bay
Joined: Dec 2000
Posts: 5,854
America
This testing was 30 days after last tests were done to see if over that period of time if anything changed in forcing the fuel leaner, esp during power enrichment and WOT.
Weather was between 45-50 degrees.
Due to that and all the cinders on the road city uses for ice on road I could not do hard standing start WOT launches so the maximum performance could be seen but enough hard engine load to see if any knock would occur or loss of timing due to it.
Maximum speed was 121 MPH Maximum RPM was rev limiter at 6,700 RPMs Maximum airflow was 45 lbs which shows engine was pulling very nicely Average WOT timing was 27 degrees which shows no loss due to being too lean.
Combined driving had a 27 MPG average.
Zero knock or misfire. Not even 1 degree of timing lost.
Even though flywheel HP was 468 the maximum injector cycle of these 40 lb injectors was only 64 percent while the maximum injector needed for this testrun was only 32 lb. Consider a stock LS1 uses a 26lb and that is for only 350 HP.
This shows :
1. again that the engine does NOT have to be tuned to be rich as in this case LTFTs were set as seen in the results that WOT engine loads fuel trim cells 15 and 22 were about 5% too lean yet no ill effect to engine or performance.
2. Using water/methanol correctly reduces the load on how long injectors are on, less fuel needed and engine can use a smaller injector that has better response times.
O2s reported for NON WOT at 489 mVolts which is about a AFR of 14.2:1 which is correct for smog gas and during WOT reported 875 mVolts which is about 12.5:1 AFR even though fuel trims going into WOT was 5% too lean.
This extended test period proves you can save gas, run leaner, have no knock by tuning leaner and that w/meth with our smart 2D controller can save fuel yet give good performance
Team ZR-1 True Custom Performance Tuning Teamzr1.com