Jerico input sensor

[fekbmax]

Ok jerico goo roo's I don't know if any of you guys run any kind of data logger with a transmission input shaft sensor but I ran across this while looking for some info on the racepak sportsman data logger. A friend of mine is old and tired and starting to part out some o the stuff in his top sportsman/quick 8 car and I got first dibs on his sportsman series racepak. This collar looks like a good setup to me because with the old Lakewood bellhousing and clutch setup I'm using and the large face throwout bearing, well there's just no room on the candle stick to mount the sensor and still have enough bearing movement. I think this would work perfectly but the collar has to be made and well I have thought about trying to do just that but my old 3 i1 machine would be a bear to make something like that on. I know Jay recently made a collar of his own for a different type appalcation and was wondering if you (Jay) or anyone else with the equipment could make one from these plans ?

[jayb]

I could certainly make one, but it would be a lot of work.  I can see at least two different setups on the CNC machine, and some fixturing issues.  Any idea where to get the magnets and sensor that they used?  You would need that before you could even start...

[e philpott]

looks like it's just a aluminum split collar , like whats used on Go-Karts

[JERICOGTX]

Interesting. I'd like to run a data logger. Clutch slippage is more evident in high gear, and really you just need to know driveshaft speed, and engine RPM's.

[fekbmax]

The clutch sensor from racepak comes with 1 magnet, the basic kit uses one magnet that you drill a small hole into the input shaft and press it in with some apoxy and peen it in. Most top sportsman guys use atleast two magnets though and many (the pro's) use 8 for 4x the resolution. In those cases Most are useing one of the split collars like used for the driveshaft sensors. Some even use a driveshaft sensor instead of the clutch sensor because of the added length and reach when installing inside the transmission somewhere as apposed to the candle stick. Some of the jerico guys use this and go through the top case instead of the side but still use the same location for the split collar inside.

I noticed that they do offer a special order split collar in the size of 1.625" . shouldn't this collar be able to be used by simply opening it up to the 1.746" ?

Clutch slippage is more evident in high gear when your only useing a driveshaft sensor. Driveshaft sensors work good for hi gear and showing tire spin but with a clutch sensor you can see so much more of what goes on from the launch and through every gear change. You can see what effect each change that you make to your clutch setup has on your combination. It's an awesome tool and can help alot in getting you to your ideal setup for each track and conditions. Is it over kill for some back yard hack like me ? Maybe so but its some very interesting data when you can overlay and compare it to your rpm and driveshaft speeds.