Question...

[RacingRev 1320]

Everyone says we can't do gears because HAL won't let us. The big block is the difference in front to rear wheel speed. If that is the case couldn't someone come up with a convertor to send expected signal to HAL?

In the service I was an electronic warfare tech and we would alter frequencies and phase of an incoming signal and send it back to the enemy. I'm guessing the ABS sensors are the signal generators for wheel speed; so if some one computed the different frequency(pulse rate)for let say 3.23 gears using a stock tire diameter, it should be relatively simple to come up with a simple in-line convertor to send the expected signal from the rear wheels to HAL. If a separate signal is used as a comparator from the tranny, that signal could also be converted to achieve the required results without any hiccups. What do you guys think about this?

[Driller]

Sure, but what do you do about the finigian pin?

[mcshocks]

I have not looked at any diagrams, but I wonder if there is a reluctor wheel in the mix. If HAL is looking for said reluctor wheel speed then if we placed the properly toothed reluctor wheel with the gears all should be good other than the speedo settings, which I would think the tuners could take care of. Inquiring minds wonder.

[Hemi31]

There is a sensor in the rear diff as well as wheel sensors.

[RacingRev 1320]

All of the signals regarding wheel speed, differential revolutions, etc. are based on a fixed value: rotation of the wheel assys using the stock tire diameter. regardless of the mechanical source of the signal, there is a known digital input for that signal that HAL is looking for.

if for instance HAL is looking for 100 ABS pulses(mechanical converted to digital) per second at 60mph with stock gears/tires, 150pps from the differential and let's say 260pps from the tranny; when you change to lets say 3.23 gears, you effectively speed up the wheel rotation (telling HAL the tires are too small in the rear) and therefore increase the output frequency from the various sensors by a fixed amount outside of the expected frequency(that is they don't match the front wheels rotation speed).
By computing the mathematical differential, you should be able to digitally slow down the new signals to the frequency HAL is looking for from whatever the source. you could then fine tune the signal to the speedo so everything is copacetic from the drivers seat.

A little black box 2"h x 4"w x 6"l should be able to contain all of the necessary circuitry for in-line digitally converting the new input signal frequencies to the HAL required input signal frequencies. Any gear ratio change could be computed and then converted!!

[RacingRev 1320]

Sure, but what do you do about the finigian pin?

you remove it and put it on the shelf next to the 5gal of jet airplane propellor washer fluid and the 500ft roll of water-soluable flight line!!