I thought I'd get a 3 inch AFM for the 3 litre engine that is threatening to go into my GTV6. There seem to be about 10 variants in the L-Jetronic series. Bosch part numbers 0 280 203 001 to 0 280 203 114 (from memmory) numbers higher than 14 are Motronic AFM's with a different connector. The 0 280 seems to be a generic AFM number. 203 seems to indicate 3 inch (as opposed to 202 as fitted to the GTV6 standard). The final 3 numbers refer to some sort of vehicle specific code, but I cannot find any information on the difference between (say) a 0 280 203 001 and 0 280 203 002 AFM. There would be about 6 different 3 inch AFM's available on ebay. Does anyone know?
FWIW, when I put a 3.0 litre in my GTV6, I just swapped the board and the wiper under the plastic cover and it started and idled fine, but wouldn't operate under load.
I'm currently running a standard AFM and it goes like a cut cat with that. Still working on the 3" one.
The engine is a converted 164 one, running the original L-Jet. Seemed to be the path of least resistance at the time as there was one induction runner missing off the 164 engine!
Steve
Adelaide
The 164 uses the Bosch Motronic system, which includes timing and a Lambda probe and a different cold start system (ie no cold start injector). The GTV6 uses L-Jetronic, which is an open loop fuel only analogue system. The 3.0 litre 75 uses a 2 inch AFM P/No. 0 280 202 010. From memory the 2.5 litre is 0 280 202 002. Auto Delta used the 3 inch 0 280 203 002 AFM for their 2.5 litre setup.
Still confused about the P/no differences.
My understanding is that the L-Jetronic used an AFM signal that was greater than the now more normal 0-5 volts.
Years ago I played with a larger AFM body and existing circuit board in my supercharged MR2.
While I could get the car to idle by setting the flap spring tension low enough so the AFM gave the correct voltage, to get that whole shooting match to work properly, I used the http://www.jaycar.com.au/productView.asp?ID=KC5385&form=CAT2&SUBCATID=965#11.
Autospeed has some decent articles on the device and its application to early Bosch injecton http://autospeed.com/cms/title_The-Digital-Fuel-Adjuster-Part-1/A_2418/article.html and http://autospeed.com/cms/title_The-Digital-Fuel-Adjuster-Part-2/A_2420/article.html.
Note that unlike MOST voltage interceptors, the DFA can be configured to work with voltages higher than the normal 5 volts.