Sensor Readings and Adjustments
Fuel pressure: Start at 43psi (vacuum line off). Should drop about 5-8psi with line on. Adjust +/- 3-4psi
to where car runs the best.
TPS: Set the closed throttle TPS to .40-.46 volts. Set the WOT position to 4.20-4.60 volts, do
not exceed 4.8 volts.
lAC: Car warmed up in Park, around 10-30.
Oxygen sensor: Car warmed up at idle, .750-.850 is typical.
At WOT on pump gas, .780-.850 is typical.
At WOT on race fuel or alcohol injection, .750-.800 is typical.
Take WOT 02 readings in 3rd gear for consistency. The reading will generally be higher in the
lower gears and drop some by the time you get to 3rd gear due to the 02 sensor heating up.
These readings are typical for Scan master, Directscan, and Turbolink. Other scantools may read
differently.
Programmable Features
There are 4 areas of this chip that can be adjusted by the user: WOT Fuel, WOT 1st Gear Fuel, WOT Timing
for 1st/2nd gear, and WOT Timing for 3rd/4th gear. You do not have to adjust these, but it offers you a way of
fine-tuning the chip for your car or conditions. You will need a scan tool that can display BLM and LV8.
Scan master, Turbolink, Directscan, OTC, should all work fine.
Use Caution! The adjustments available to you with this chip have the capability to do serious harm to your
engine if you do not monitor your fuel mixture and knock retard with some type of scanning device.
Parameter 1 - WOT Fuel Adjustment - Overall
This feature will add or subtract from the default wide open throttle (WOT) fuel in order to make the fuel
mixture richer or leaner at WOT (in all gears). The adjustment range is +/-20%. The default number shown.on
your scantool is 128 which means no change, the minimum is 102, which is -20%, and the maximum is 154,
which is +20%. This adjustment is applied when boost exceeds about 12psi. With smaller injectors, you may
have already have max fuel, or close to it, so this adjustment might not add anymore fuel in that case.
-~~-~----;:;---~- ~~-~~ - ~-----------I
- -- -parameter 2 - WOT Fuel Adjustment _1st Gear Fuel
Same as WOT fuel adjustment except applies to 1st gear only. This is added or subtracted from any
adjustment you might have made to the Overall WOT fuel above. Use this setting to adjust your fuel mixture to
help launching and 60' times at the track. If you have no MPH signal (no VSS), don't use this adjustment.
Parameter 3 - WOT Spark Timing, 1st/2nd Gear Adjustment
This feature will add or subtract from the default timing in 1st and 2nd gear at WOT. The default number
shown on your scantool is 128 which means no change. When the number is raised, each number equals .35
degrees. So if you raise the number to 131, you have added about 1 degree of timing. The max is 154, which
is an additional 9.1 degrees. The min is 102, which subtracts 9.1 degrees.
Be very careful when running rump gas (91-94 octane), as it generally cannot tolerate much more than 18-
20° total timing at full throttle. 1s /2nd gear can sometimes tolerate a little more.
Parameter 4 - WOT Spark Timing, 3rd/4th Gear Adjustment
Same as 1st/2nd gear except applies to 3rd/4th gear. If you have no MPH signal (no VSS), don't adjust this.
Be very careful when running pump gas (91-94 octane), as it generally cannot tolerate much more than 18-
20° total timing at full throttle.
You can see where any parameter is currently set by turning the key on (engine off), set your selected
parameter to the one you want to see (see next page on how to select a parameter), then look at BLM on your
scan tool. By default, all parameters should be at 128 if the ECM was reset correctly during the chip install. For
Directscan or Power Logger users, the parameters will display on the bottom row of the BLM grid. The last 4
cells in the grid are parameters 1, 2, 3, and 4, in that order.
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