toddk911

well, I had alwasy thought LOW/MID/HIGH meant in regards to low,mid or high rpm ranges.

but I did some reading on some other sites and they were saying it is only about airflow. LOW/MID/HIGH air flow levels.

Which makes sense as the a/f required at 4K rpm for cruise, part throttle and WOT would all be different. Depending on air flow. The rpm has nothing to do with it.

Does that sound right???

If that is, then at WOT you can not change the a/f in the low, mid or high rpm ranges as seperately. ??

Tom M'Guinn

Right. The low, mid, and high descriptions refer to undefined ranges of voltage coming off the MAF or AFM. That voltage tends to go up with RPM's (at any given throttle position), but the ***** are not directly mapped to RPMs. See details at splitsec.com After 6 years of fiddling with mine, I am finally making the jump to a digital controller.

toddk911

LOL, yea, I knew mine would be temporary. Then go SMT-6 down the road

toddk911

Ok, so on a WOT datalog run, if you need to make adjustments on the lower/mid rpms, how do you do that?

toddk911

"Features:

Low load calibration (offset adjust)
Mid load calibration (linearity adjust)
High load calibration (gain adjust)
Acceleration (idle enrichment) "

So, ACCELL has nothing to do with accelerating??? LOL I thought that was for when initial or extra load is put on; as a gain control.

But it looks like that is for the HIGH.

So the MID makes adjustments across the board???

For LOW, what do they mean by "offset adjust" ??

I'm all confused now

testarossa_td

All I can say is ...what a beating
I can't count the endless hours of fun I had messing with the ArcII setup.
I will see if I can find my old manual from years back when I got it from SFR.
Or just ask Tim over at Speed Force.

toddk911

Well, I have been to the Split Second site plenty of times, but I guess I always had in my head that it was RPM's the LOW/MID/HIGH were referring too.

TonyG

The ***** are refering nothing really.

The LOW **** moves up the entire adjusted "curve" up or down.

The mid bows the mid load range up or down.

The high bows the high load range up or down.

TonyG

toddk911

So say you have a mid rpm richness or top rpm lean, etc. How do you adjust??

TonyG

>>>So say you have a mid rpm richness or top rpm lean, etc. How do you adjust??<<<


RPMS are irrelevant.

If you have a overly rich condition in the middle load ranges, then you would adjust with the MID ****.

If you have an overly lean condition on the high load ranges, then you would adjust with the HIGH ****.

Sometimes, you are are the end of the adjustment range. In this case, you would use the LOW **** to bring the entire "map" up or down, then readjust from there.

OR... say you want to make an adjustment that spans the entire operating range of the engine, you would use the LOW **** for this.

The ARC2 works great if you understand how to use it.

TonyG

Tom M'Guinn

The MAF/AFM generates a voltage from about .5 volts up to about 4.6 volts, depending on the amount of air going into the motor. The LOW **** adds a fixed amount of voltage across the whole range. So, for example, it might add .2 volts to the signal across the whole voltage range. At the low end of the range, the extra .2 voltage makes a big difference -- changing it from .5 to .7 volts -- a 40% increase. At the high end of the range, the extra .2 volts doesn't mean as much since you will go from say 4 volts to 4.2 volts -- only a 5% increase. The MID **** adds the most in the middle of the range and less at the low and high end of the range. The HIGH **** adds the most toward the top of the range, and adds very little toward the bottom of the range.

The ACCEL **** is like the LOW ****, except it is ignored when the throttle switch is closed, resulting in bump when you crack the throttle.

They all interplay too, adding to the fun. It can help to log your AFM/MAF signal to see how the **** settings affect the signal, and to see which ****(s) is best to adjust.

reno808

keep it come i am getting a ARC2 controller prob next week. any good sites?? or manuels you guys might have in hand???

toddk911

www.splitssecond.com

Ok, I am getting the load issue vs. the rpm now, but that means at WOT, you can not relaly adjust the spool up range or mid range rpms seperately.

I.e. I have a rich dip in the 3-4K range and right at 12:1 in the top up. So how do I lean out the mid range, being at WOT, without leaning out the top end??

toddk911

Great info Tom and Tony.

yea, I have the Zetronix and can not seem to get rid of the rich dip in the mid rpm's at WOT.

TonyG

Here's a link which shows you exactly what's up with the ARC2 complete with installation instructions with or without a MAF.

http://www.tonygarcia.org/arc2

TonyG