#SPARK SUPERCHIPS FLASHPAQ UPDATE FULL#

Once you're dealing will headers and a very low restriction exhaust system the EGT's still play a factor in your AFR because it is a good rule of thumb to keep the EGT's below 1500☏ as measured in the header tube about 1.0' downstream from the cylinder head and header flange interface. When a good quality header is installed (stainless steel with thick flanges) and the catalysts are removed you can get away with a much leaner AFR because you no longer need to enrich the AFR to keep these two key components cool or below their temperature limits. So at low engine speeds the stock calibration is set to deliver what ever is determined to be LBT for that engine combination and the AFR is then enriched to maintain the EGT's or exhaust gas temperatures at or slightly below the safe temperature limits of the exhaust manifolds and the catalysts. In the stock calibration the AFR's are much richer than 13.1:1 AFR to control the temperatures of the exhaust manifolds and more importantly the catalysts, which will begin to melt internally when the gas temps inside of them gets much hotter than around 1800☏. In the Hemi's case LBT is around 13.1:1 AFR, so if you run leaner than this you will be losing power. The correct AFR is determined by finding LBT or the Leanest AFR for Best Torque. When calibrating an EFI engine controller the AFR is the first thing that is calibrated.

MBT is short for Minimum advance for Best Torque. There was posted in a past DT thread that might help.įor every engine speed/RPM and engine load/MAP, manifold absolute pressure, or manifold vacuum, there is an optimum spark advance setting which is called MBT spark advance.

Speedometer recalibration for gears (transfer case and rear axle) Between 2.00 - 10.I've not had that problem.

Corrects speedometer for tires between 22.5” - 44.25”.

Engineered transmission shift points and firmness.

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#SPARK SUPERCHIPS FLASHPAQ UPDATE FULL#

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