Racepak for stick cars

[GEORGE PETERSON]

Originally Posted by Todd Hoven

Has anyone put this sensor in a Gforce G-101 4 speed? Is there a good way of doing it?

Todd,

G-Force can supply a bearing retainer fitted with a bung that will accept the sensor. They can also supply the necessary sealed input bearing.

George Peterson
D/S 4448

[Damn Yankee]

Originally Posted by Dallas Kelly

A top and bottom loader Jerico modified for Racepak sensor by re-machining the cast-in fill plug boss.

Dallas, did you machine this yourself (magnet collar on the shaft) or did you farm it out to someone else ? We are class rule restricted to T5's and Tremec's and I am want to mount a sensor for the input shaft data logging on our G Force T5. Because of the transmission design and no one making a sealed tapered bearing, G Force prefers not to help us with this project

[Damn Yankee]

Originally Posted by Mark Madison

The oil has not effected mine. I run the sensor about .030 from the collar. Todd Payton has suggested that if there where problems with interference from the gear oil I could use Racepaks 12v powered sensor.

If there where enough interest I would consider making a kit that would include the collar, sensor adaptor and drilling guide.

Mark Madison

Mark you have a PM

[Jim Hawkins]

I have a input sensor on my jerico in my ss/i car that is exactly like the one Mark built for his. I did alot of research and no one makes a kit to do this, including jerico. There is no way we could see to mount it to read directly off the input shaft. My machinest made a slip collar with a magnet that installs on the cluster. We drilled and tapped a 1/2 hole in the case and used a 1/2 bolt with the center machined and tapped to accept the sensor. My trans. is a older bottom loader and was easy to set up with that bottom cover removed. I use a computech system and it will convert the main drive ratio to 1:1. I have a new jerico trans. that was just finished last week and they installed the collar and drilled the case for me. The new trans. does not have the bottom cover so need to install sensor and collar as the trans was being built. This has worked well and have seen a few others done the same way.

[Damn Yankee]

Jim, we were looking at our T5 case and most likely will have to mount the sensor to where it will read off of the cluster shaft as well. We are using a Racepak Sportsman box and will have to see if it will convert to the main shaft speed as well.

[james schaechter]

Originally Posted by Damn Yankee

Jim, we were looking at our T5 case and most likely will have to mount the sensor to where it will read off of the cluster shaft as well. We are using a Racepak Sportsman box and will have to see if it will convert to the main shaft speed as well.

Mark provided us with his pattern for the jerico. If you can make a collar and drill and tap the case, it works great! I am sure that the same principle will work. You will have to see where it can all fit in there! It helps to have a friend with machinist skills. Easy work for them to figure out. I like being able to figure out when and how long the clutch slips. If you do that and if you have data from kyle carruthers clutch dyno, it makes life easier as far as clutch tuning is concerned. Especially if you have to adjust for heads up vs. Elims or track conditions.

[Damn Yankee]

Thank you James

[John Nechiporchik]

Yes.....The Racepak sportsman can easily be configured to convert a cluster shaft mounted sensor to 1:1 for the input shaft. You need to know the number of teeth on the input gear and the cluster to do the math. Mine was 29/20 for a 1.45 ratio.
You need to change one number in the clutch configuration table to make this happen.
I bought my sensors from Greg Kelley(the guy that started this thread). He walked me through the process to re-configure in about 2 minutes.This, of course assumes you already installed the sensor in your Racepak/Laptop.
Greg can also help with this if you have any questions.
Also, in the configuration program, make sure you indicate if you have one or two magnets in your collar.(pulses per revolution).

[Damn Yankee]

Guys this is all great input and is much appreciated. A friend of mine who I helped crew with had the typical G Force deal reading his input shaft speed from the front bearing retainer on his GF5 but I knew the T5 would be different. Again all reply's are much appreciated !!!

[Dallas Kelly]

Originally Posted by Damn Yankee

Dallas, did you machine this yourself (magnet collar on the shaft) or did you farm it out to someone else ? We are class rule restricted to T5's and Tremec's and I am want to mount a sensor for the input shaft data logging on our G Force T5. Because of the transmission design and no one making a sealed tapered bearing, G Force prefers not to help us with this project

"Damn Yankee" sorry to take so long to answer.
No, I did not do the machine work myself. Chuck Buckshorn, friend, excellent machinist and long-time racer, actually made all the pieces. During the layout process, we discovered that the fill plug boss lined up, laterally, with where we needed to be on the cluster. The case was externally milled to adjust the angular alignment to the countershaft center line. I bought a length of, I believe, 1" aluminum hex rod that was machined into a combination fill plug/sensor adapter with o-ring seals. The split ring is very straight forward since there just is not sufficient clearance to allow very much variation of dimensions. I sold both of the modified Jerico transmissions without verifying that the design would work. However, the Jericos were replaced with Libertys, also modified by Chuck and they work with the standard Racepak clutch sensor and a single magnet in the countershaft split ring.