Racepak for stick cars

[MOTORSPORTS Innovations]

I get more and more calls on Racepak for stick cars. The questions are usually:

1. How hard is it to use the software to see slip. And this breaks down into A: do I have to be a computer wiz and B: can it really show what is going on in the first second?

2. How much does it cost?

To answer the first question, here is a graph from a Pro Stock car where I have zoomed in on the first 2 seconds of the run. (it's the only one handy - anybody want to send me some Stock/ SS stuff I'd like to see em) with the 4 steps highlighted.



So the steps are:
1. Click mouse cursor on the time into the run
2. Use arrow keys to get the time exactly where you want it (in this case .102)
3. Look at slip percentage (16% for this car)
4. look at lock-up curve (yea, I know there are two #3's)

The Red line is engine RPM, Blue is the drive shaft, Green is the input shaft


Make adjustments to car and repeat until you run quicker than the current record in your class

How much does it cost - $1119 and that get's you a Racepak Sportsman logger, input shaft sensor kit and a 9' cable, software, cables and laptop accessories. Besides reading the input shaft you get engine RPM, shaft RPM, accell & lateral G meters, and volts. Adding O2, temperatures etc is easy.

Let me know of any questions.

Greg Kelley 609-265-2110

MSI - A Sponsor of the East Coast Stock -SS Association

[MOTORSPORTS Innovations]

Here is a picture of the clutch kit

[Jeff Lee]

what do you suggest with no candle stick?

[Dirk Olson]

I have a RacePak on my B/S car and have not found good place to install the sensor on the Jerico. I know guys have installed them on the input. They have had problems with magnets and broken sensors. I was was looking at using the reverse idler but then would need soft ware to do the conversion. Jerico at this time does not a solution for this. Has anybody found a better way?

Dirk Olson
5036 B/S

[George Wright]

You can create additional channels in your RacePak. Create a new channel for 1st gear, 2nd gear and 3rd gear. In each new channel you can apply a formula. For 1st gear divide the driveshaft rpm by the first gear ratio. This will give you the same graph line for first gear as if you had an input sensor. You can do the same for 2nd and 3rd, just divide by their corresponding ratios. Yes you will have to look at four different lines, instead of one "clutch" graph line, but you will get the same results. You don't need to do this for 4th gear since it is 1 to 1.

[Mark Madison]

This works for me. Instead of mounting the fragile $80.00 sensor on the input shaft I mounted mine on the side of the case so that it reads a split collar on the cluster. The spud pictured is counterbored and tapped to accept a standard RacePak driveshaft / clutch sensor. The RacePac program is able to correct for the M/D ratio of the cluster for a direct single line readout as if the sensor was reading from the input shaft.

[buzzinhalfdozen]

Mark Madison, now that's using your head... never would have thought of that Good job. Joe

[Dirk Olson]

Mark,

I actually had thought the same thing accept I bought a couple differant split collars and they are way to big, along with not having much room between the cluster and main shaft gearing. If you could point me towards where you got the split collar I can make the rest. This would GREATLY appreciated!

Dirk

[Mark Madison]

Dirk, I made my own collar. As you know all the commercial ones are way to big. The collar must be 2.375 o.d x 1.750 i.d x.375. with a small notch in the i.d so the oil relief hole in the counter shaft is not obscured.

Mark Madison
A/S 7995

[Mark Madison]

Thanks Joe

Mark Madison
A/S 7995