Boost and idle frequencies

[jsmcortina]

With the availability of hardware PWM channels on the MS3 chip, I _had_ trashed the old software PWM outputs for idle and boost etc. However, it seems that the frequencies I've chosen might not go low enough.
e.g. I've been setting up a Bosch 2 wire 0 280 140 516 valve today and it doesn't work at any of the high frequencies and looks to want something like 50Hz.

Conversely, many MS2 users have complained that the existing frequencies were too low.. well, those guys are covered at the moment, but us low frequency guys aren't.

What frequency ranges are required? I plan to add back the software PWM, but might see what I can do with the hardware PWM dividers for other frequencies too.

James

[UnaClocker]

Jean offers that PWM multiplier board, it'll multiply it up as many as 256x higher than what the MS puts out. So for people using that, the lower the better, we can just step it up from there, but if it starts out too high, that board won't divide it down lower.

[jsmcortina]

Maybe I'm missing something, but why do you need the board if the output from MS3 is right in the first place?!?

James

[Paul_VR6]

The 2 wire Bosch valves that come on the 92-95 VW's use 100hz stock, and I've used that freq successfully on quite a few installs with that valve. I know the later throttle bodies with the integrated throttle body/idle valves want 200-300hz, but I still have to do more testing to pin that down.

[turboy]

G60, bosch uses 147hz. I'm using this freq. and it works like oem.

SFC