Is anyone running with 20AM air flow meter ?

[blaze_away]

I am about to switch to a 20AM AFM on my 4.6 chim and would appreciate any wisdom from someone with same upgrade.
In particular dors anyone have a 14cux fuel map

[TV8]

I think that you need to rescale the map whatever that means. Spitfire4av8 (Jules at kits and classics) did my car. Stevesprint or blitz might have a diy option.

[blitzracing]

Sorry I dont have any base maps for the 20 AM. I would not think it too hard to rescale from the 5AM, as its voltage is 15% lower across the whole voltage range for any given output as a starting point.

[blaze_away]

Thanks folks.

Mark you mention 15% difference between 5am and 20am.

I assume that is the 20am will read 15% lower as air velocity across the hotwire will be lower vs 5am for same volume of air passing into the engine.

With that in mind is it just a case of upping each fuel maps cell by 15% using Tunerpro ?

[blitzracing]

You are correct -15% lower.. What you need to be able to do is reach the bottom of the table at peak airflow- Now I'm not sure but Id suspect the a scalar value is the one you tweak to shift the whole table- so it would make sense to increase this by 15 %. Not tried it myself. Ive had a quick look- there are two scalers- row and main. The mains appear all to be FFFF, but the row scalers have coherant values but Steve Sprint or Joolz would be better bets on this.

Edited by blitzracing on Saturday 23 November 15:32

[blaze_away]

Thanks for that will take a look in TunerPro.

Incidently I fitted the 20AM and it does run.

Not sue whether to go for a RR remap or fit wideband lambda and diy it.

[spitfire4v8]

Are there 2 threads running with the same title? I'm sure I replied to this the other day ..

[blitzracing]

Steve has put me straight on the two scalar values. As I now see it the main scalar is the multiplication value for the amount of fuel going in against each load cell value- so tweaking this will simply increase or decrease the amount of fuel going in over the whole rpm / load range. Problem here is you wont make most use of the map if you simply add fuel and miss out using the bottom rows of the map as the AFM output is not as high as the 5AM. This is where you need to increase the row scalar by 15% as this is the AFM multiplication factor to allow you to reach the full load cells at peak airflow. Not that Id be messing around without an AFR gauge to check out any changes Id of made.