s-afc II rpm question

[danyz250f]

i got my new s-afc II in and every thing seems to be working write except for the rpm reading when i am at like 2000rpms the afc reads like 1000, so its like what ever i am going it reads about 50%. Also is it a good idea to tune with the stock injectors? only untill i get some 650s.

 

[Catbox_95]

Sounds like you've got the cylinder setting on the AFC set wrong. Your AFC probably thinks you're running a V8, which would read half of what a 4-cylinder is doing. Check that.

 

[danyz250f]

I'm pretty sure its set on 4. when i set the main things like how many cylinders and karmen, you set every thing with the car off but ignition on the turn off the ignition and wait till the afc turns off then it will save all the info, and your good to start the car?

 

[MyBeatGSX]

Correct. Just go back to the "etc." menu and double check. If that doesn't work just set it to 2 cylinder and see if that fixes it, if not you have a bigger problem.

 

[danyz250f]

what do you mean bigger problem?

 

[CanadianTSi]

Correct, set it to 2 cylinder and you will be fine.

 

[danyz250f]

why would setting it to 2 cylinders mak a difference and not make the car run bad. why do they even have these settings any way you can go as low as a 1 cylinder and as high as a 16. I dont know of a 1 cylinder car and not many tuner cars have 16. So does the number of cylinders only have to do with rpm? and the only thing real important is when you do the initial setup is the type of mass air flow sensor you have so your car will run?

 

[steve]

So does the number of cylinders only have to do with rpm? and the only thing real important is when you do the initial setup is the type of mass air flow sensor you have so your car will run?

Yes, the number of cylinders has to do with the SAFC knowing how many pulses per revolution to expect on the RPM wire. Since all the SAFC corrections are based on RPM it has to be right along with setting up the airflow sensor and TPS.

Steve

 

[danyz250f]

you guys were right set it to two cylinders that fixed it. I guess dsm s have two coils not four, i guess this has to do with the fact that two of the cylinders fire at the same time.

 

[steve]

I guess this has to do with the fact that two of the cylinders fire at the same time.

It has more to do with the instructions telling you to use the wrong signal for the RPM. If you use the tach input or the CAS signal rather than one of the power transistor outputs it works set to four cyl.

Steve