You can use the lm2907, that's the one that the circuit I got used, but again like you mentioned, I never been able to get it to triger with a bosch system. What would need to be done is look at one aftermarket like tt or any other that would have that rpm option and open the modele to see what resistors and caps they use so it would work out. math
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rich Blake Sent: 24 octobre, 2002 06:50 To: a2-16v-list NEW Subject: RE: [a2-16v-list] Fuel Entrichment Module Well, after testing the module with the "butt dyno", it definately does work from 4500 to 7000. Not huge but definately an improvement. However the pot I used is pretty crappy and adjusted itself after 10 minutes of smashing the throttle. I am going to install a fixed resistor at 1100 ohms unless someone can give me reasons to go higher than that. I like the full throttle LED idea, this is probably the best solution to the low rpm bog issue. An RPM sensing circuit looks nice on paper but from what I have gathered cannot be easily designed to work in this Bosch system. My electronic theory knowledge isn't what it used to be so I'm going with the k.i.s.s. principle. I did do some research on RPM sensing circuitry and it can be done based on the LM2907 IC. LM2907/LM2917 specs www.ee.washington.edu/stores/DataSheets/linear/lm2917.pdf There are many applications, I happen to like the LED tach kit which could be modified to make a mutli range shift light array AKA F1 and ALMS cars. LED Bar Tachometer circuit http://www.t-r-j.com/Auto/Tach/tachometer.htm Thanks for everyone's input. Rich Blake _______________________________________________ a2-16v-list mailing list [email protected] http://mail.a2-16v.com/mailman/listinfo/a2-16v-list For list archives, see listinfo link above.
