MPI foel controller setting help

[unreal]

I was wondering if anyone knows a good base set of readings for the fuel controller. Altitude is 1850ft and the sled is a 2006 Apex mountain. Ulmer clutching, MPI supercharger stage 1 22/26 pulleys 10 lbs.boost. Any help would be greatly appreciated. I have Ulmer's settings but there for sea level. Thanks again all you guys out there.

 

[Ted Jannetty]

I was wondering if anyone knows a good base set of readings for the fuel controller. Altitude is 1850ft and the sled is a 2006 Apex mountain. Ulmer clutching, MPI supercharger stage 1 22/26 pulleys 10 lbs.boost. Any help would be greatly appreciated. I have Ulmer's settings but there for sea level. Thanks again all you guys out there.

You need a Wide Band O2 sensor Gauge so you can see how rich or lean you are before you start any tuning or you could destroy the engine.

http://turboaddictionparts.com/catalog/ ... cts_id=106

Sea level to 2500 feet is about the same.

Ted.

 

[HAMMER]

anyone know a good base set of readings

My SCApex's Air Fuel Ratios

12.5-13.5 Idle
13.5-14.5 Cruise
11.8-12.2 Wide Open Throttle

Short version of an article on air fuel ratio:

"In most cases the target air fuel ratio for naturally aspirated engines will be between 12.8:1 and 13.2:1 whereas supercharged, turbocharged, and nitrous injected engines will like a richer mixture between 11.5:1 and 12.5:1"

"Due to the low port velocity and frictional losses Idle mixtures are typically set at a fuel ratio of 12.25:1. Your motor will idle at stoichiometry (14.7:1) or less than stoichiometry but this is very near misfiring and if operating temperatures are not stabilized at a high level the motor will die during abrupt acceleration. Operational fluid temperatures and inlet air temperatures can easily vary 100 degrees Fahrenheit. These variations in temperature all necessitate different mixture requirements so it is far better to keep the fuel ratio in the 12.25:1 region to preserve idle quality and off-idle responsiveness"

"There is no magical, absolute, digitized answer to developing your applications fuel requirements. You must drive your machine and a considerable amount of judgement must be placed in such areas as cold start, warm-up, acceleration fueling, idle quality, and driveability. Each motor is different and the calibration will be only as good as the effort you put into it. Much subjective decision making will take place and the air fuel ratio meter will not provide you all the answers. Elapsed times, lap times, and your own opinions as a tester are equally valid"

 

[unreal]

Fuel settings

Thanks for the info. guys, especially Hammer I was looking for this info. By the way tried it out using ulmer's settings in the field and our airport in the field and it went great. Tommorow I'm getting my bung put in the exhaust for the O2 sensor (my mig buggered up) I can then install the WMS gauge I got for it. Do the tuning and off to the mountains. But so far all was good.