TUNING SUGGESTIONS AND TIPS

Suggested tuning, tools and equipment

Read the R4 Engine Programming instructions

Digital volt ohm meter

A/F mixture meter

Timing light

Vacuum / boost gauge

Single pole toggle switch

Stock "VS" output voltages at various operating conditions

Idle = 4.80 volts @ 800 R.P.M (stock ignition timing)

Cruise = 7.50 volts @ 2000 R.P.M / 32 M.P.H

W.O.T = 8.90 volts (12.0 -12.8 to 1 A/F ratio)

Fast idle = 7.34 – 6.73 volts (cold coolant temp. 14.7 to 1 A/F ratio)

Fuel injector sizing

Fuel injector’s should only support an additional 10 to 20% H.P than actual H.P requirements. Failure to match injector sizing correctly can cause engine damage or poor driveability.

Ignition timing

The FTC-089 calibrator provides up to 20 degrees of ignition timing retard, for those requiring additional "initial" timing advance you simply increase the initial timing of your choice and then retard the same amount of your increase.

For turbo or supercharged applications, you generally are concerned about detonation during boosted conditions.

Example:

5 degrees initial, plus 35 advance, equals 42 degree’s of total timing. If you choose to advance your initial timing to 12 degree’s for better performance, you would then need to retard 7 degree’s of ignition timing in MAP B, typically at the 2000 R.P.M and up cells. This procedure allows for the initial advance increase and maintains the same total advance as original. Your optimum timing curve will depend on your specific engine’s requirements.

 

FUEL TUNING

The FTC-089 allows for a wide range of fuel injector control. Zero to 20 is the total range of change, with10 being neutral. The R4 software provides real time display, but due to the original ECU’s programming protocol you cannot reprogram in "real time". For convenience it is best to remove the vehicles ECU fuse, and temporarily wire a simple 2-pole toggle switch with an in-line fuse holder in place of the original fuse. This provides a convenient way to reset the stock ECU’s programming during each change made. You must reset the ECU for each and every change you make to either the fuel (MAP A) or ignition timing (map B) in order to program the calibrator.