air fuel ratio meters, Anyone have much experience using these on D-Jet Options

[914Mels]

Sounds like you've done this once or twice.

[brant]

It may not be where the factory set the MPS.. for fuel economy and emissions
but these motors make better power in the range of 12.8-13.2 to 1 at Wide open throttle.

Thats what I tuned for

[914_teener]

Factory Djet is close enough for a hydro cam 914..as the cam timing is mucked up by the ramps compared to a solid lifter cam which has better cam timing.
use the LM1 to set the "partload" to 13.5/14 to 1 AFR at 2500rpms driving at a steady speed up a long slight uphill road in 3rd gear. Check it at freeway speeds to get it to hang around 13.5/14 driving in 5th gear at speed up slight slopes as if you are coasting (off throttle) its no good. You want a steady throttle at a steady speed with slight load.

Then check the Wide open throttle settings- those should be in third gear at 10-15mph punch it and see. It should start at 11/11.5 to 1 to start and all the way up to 5000 rpms slowly lean out to 13.5 to 1. This is adjusted with the large machined plug witch you have to remove undamaged to get to the inner screws to adjust the part load.
Finally, check the idle as it should be to 13.5 to 1.....

First off, make sure the engine is in top tune, valves adjusted, no vacuum leaks and Fuel pressure adjusted to 29lbs.

Very cool! Thanks for that Geoff

[914Mels]

Factory Djet is close enough for a hydro cam 914..as the cam timing is mucked up by the ramps compared to a solid lifter cam which has better cam timing.
use the LM1 to set the "partload" to 13.5/14 to 1 AFR at 2500rpms driving at a steady speed up a long slight uphill road in 3rd gear. Check it at freeway speeds to get it to hang around 13.5/14 driving in 5th gear at speed up slight slopes as if you are coasting (off throttle) its no good. You want a steady throttle at a steady speed with slight load.

Then check the Wide open throttle settings- those should be in third gear at 10-15mph punch it and see. It should start at 11/11.5 to 1 to start and all the way up to 5000 rpms slowly lean out to 13.5 to 1. This is adjusted with the large machined plug witch you have to remove undamaged to get to the inner screws to adjust the part load.
Finally, check the idle as it should be to 13.5 to 1.....

First off, make sure the engine is in top tune, valves adjusted, no vacuum leaks and Fuel pressure adjusted to 29lbs.

Very cool! Thanks for that Geoff

Looks like it's time to buy a meter.

[Bleyseng]

It may not be where the factory set the MPS.. for fuel economy and emissions
but these motors make better power in the range of 12.8-13.2 to 1 at Wide open throttle.

Thats what I tuned for

its where the "Factory" set these up at...as I have tested several NOS mps's to get the readings. With my post I just gave away all my secrets. (IMG:style_emoticons/default/piratenanner.gif) The factory never set them up to 14.7 to 1.

At WOT you need to get a ton of fuel to dump into the engine (11.5 to 1) like a accel pump on a carb setup. Then as the engine revs the MPS slowly leans out til 5000 rpms where is about maxed out but still "if" you rev to 6000 its got enough fuel so you are ok.