Switching to the larger 20AM air flow meter

[blaze_away]

I am running a slighly modified 4.6 in my chim and have been given a 20AM Airflow meter which I would like to fit in place of my 5AM.

Accordingly have been researching and it looks simple enough to do then follow up with remapping.

Great info here at RPI.
http://www.v8engines.com/carbs-2.htm
About 3/4 down page.

It mentions fitting a "co trimmer" anyone know what that is ? ie the little device in this pic.

[blitzracing]

That resistor is a bodge to say the lease, it replaces the CO trim resistor fitted inside the 5AM, and then uses the spare wire you cut to provide a 5 volt suppy to the new AFM. From memory you dont even need a 5 v supply on the 20 AM, only the Bosch unit. The trim resistor is only needed if you run a non catalyst fuel map (ie green tune) anyway. If you run the white tune the lamda probes take are of all the CO trim. You will need a remap to run the 20 AM, best to speak to Joolz at Kits and Classics or Steve Sprint.

[blaze_away]

Thanks for clearing that up Mark. I was wondering about whether it was needed for white/cat map.

I do have all the stuff for burning new eproms for the 14cux. Might see if I can get a staring point map just to experiment with.

[spitfire4v8]

Yep when I do them in the workshop I make an adaptor loom, with or without trim pot depending what car it's going on to. Makes swapping back to the 5am really easy should you ever with to do so. I used to cut the 5am loom plug off but don't do that now, the adaptor loom takes care of everything.

There's no reason why you shouldn't be able to fit and rescale/remap as a diy fit, it's just time consuming .. though using stevesprint's data logger would simplify things massively.