Recall Tach for Pulling

Michael

Comp Diesel Sponsor
Joined
Apr 25, 2006
Messages
3,411
We have had requests from sled pullers in the past for a recall diesel tach, to prove that you adhered to the RPM limit of a given class. What RPM tach would you guys want in a recall tach? What kind of input (separate pulse generator, factory crank sensor, etc) would you prefer to use?

Thanks,
Michael Pliska
 
I just pull down the drag strip, but would love a 0-6k tack w recall and a shift light, and use the factory p/u sensor with the 2 slots on the stock dampner. JMO
Ryan
 
HI

Most guys are running a Autometer 6806 ( I believe) 0-6000rpm, recall, and it uses a new crank speed sensor (but it can be difficult to get set up even with magnets in the fluidampner). Personally I would like one that would log your run start to finish( 30-40 sec) and use some sort of pickup that is a little easier to work with. Just my 2 cents.

Thanks
 
I agree on the sensor, if the stocker could be used it would be so much simpler, it seems like trouble to do what auto meter told me and that was to drill 4 holes in the dampner and glue in magnets, no biggie to do but id be worried about the balance? Does the signal have to have 4 slots or could it be made to work with the 2 on the stock dampner? Ryan
 
HI

Most guys are running a Autometer 6806 ( I believe) 0-6000rpm, recall, and it uses a new crank speed sensor (but it can be difficult to get set up even with magnets in the fluidampner). Personally I would like one that would log your run start to finish( 30-40 sec) and use some sort of pickup that is a little easier to work with. Just my 2 cents.

Thanks

I agree with ya!!! we Canadians think alike!!!

I think it should have a sensor supplied with it but have it come with a bracket to work with either the factory balancer or a fluidampner that bolts up in the same sort of way the factor piece does. Also, have the sensor a threaded piece so that if one wishes to they can make there own bracket for holding it (some pulling class requires full shielding around the balancer).

Also it would be nice like stated above to have memory on it but maybe 1 or two minutes (some guys with big singles take for ever to spool and its nice to have enough memory to see from start to finish) and if possible have it start recording above a certain rpm so you don't have to worry about turning it on to record.

Also, probably it would be best to have it work off two groves or magnets it the ballancer instead of 4 because it would mean no cutting for modifying for a 12 valve guy and only cutting/drilling for two pickups for the 24valve guys.

RyanB
 
0-6000 30-40 sec replay would be sweet. Make it compatible with an autometer shift light. Working off the stock cam or crank sensor would be tits.
 
0-6000 30-40 sec replay would be sweet. Make it compatible with an autometer shift light. Working off the stock cam or crank sensor would be tits.

I second the stock cam or crank sensor for simplicities sake...
 
Maybe a way to set the number of notches or magnets.. or a way to calibrate it.. (Associations might not like that.. but might make it more universal.) That way it could run off gear teeth, or dampner..
As others have said, recal, recording, and optional shift light.
Bryan

(Stock600.. is that a front clip I see on the chevy?? Looks good...)
 
Maybe a way to set the number of notches or magnets.. or a way to calibrate it.. (Associations might not like that.. but might make it more universal.) That way it could run off gear teeth, or dampner..
As others have said, recal, recording, and optional shift light.
Bryan

(Stock600.. is that a front clip I see on the chevy?? Looks good...)

Yes sir, and thanks.... its growing on me.
I quess the request for the cam or crank sensor is for the newer 24v or common rail trucks, thats great but make sure us old 12v guys can get a signal also, thanks by the way for building the tach that has such a high demand or need for right now, the only thing available that i know of before this is the AM 6806, its to damn high and has no shift light......
Ryan
 
Don't the later 12V's come with a factory crank sensor that normally goes into the ECM (only for gauges, obviously not for engine control)?

Thanks,
Michael Pliska
 
I agree on the sensor, if the stocker could be used it would be so much simpler, it seems like trouble to do what auto meter told me and that was to drill 4 holes in the dampner and glue in magnets, no biggie to do but id be worried about the balance? Does the signal have to have 4 slots or could it be made to work with the 2 on the stock dampner? Ryan

I could be wrong but as long as the magnets are evenly distributed (and weigh the same, and the holes are the same depth) it should not affect the balance at all...

Like 3 at 120 degrees from each other
4 at 90
6 at 60
2 at 180

I was thinking one magnet would be nice, but by definition it would be out of balance! Any other number should work as long as you divide the number into 360 degrees to get your rotational spacing.

Right? Or no?
 
I could be wrong but as long as the magnets are evenly distributed (and weigh the same, and the holes are the same depth) it should not affect the balance at all...

Like 3 at 120 degrees from each other
4 at 90
6 at 60
2 at 180

I was thinking one magnet would be nice, but by definition it would be out of balance! Any other number should work as long as you divide the number into 360 degrees to get your rotational spacing.

Right? Or no?

Man i just dont know for sure, in theory i suppose it would be fine so long as every thing was perfect but....
After thinking about it more, im not sure what would be best for all due to many diff. poss.'s. Most that are in need of a tach like this would prob. run a nice expensive aftermarket dampner which as of now I do not. The ones that do though need a good way to grab the signal, my stock dampner has the 2 slots in it and ive picked up a new sensor from cummins, hopfully to be able to use it.... it would just make it simple to hook up. Ive messed with that sensor and a gass tach in all diff. ways and can not make it work, ive been putting a full 12v to the hot wire though and i was told that the factory ECM only gave it like 5v??? Not sure, but either way i cant make one work as is.
Not sure what the answer is going to be on a pick up that every one can make work, ive heard some say they read from the alt. also, but theres another issue for me, as I do not run one on this truck.... oh well we will see.
Ryan
 
my suggestion would be a simple drill and tap hole over the IP pump gear and a sensor just like the Powerstrokes use - it reads the pump gear teeth

I am making up a similar setup on my cummins conversion as we speak.

The other option is a bolt on plate with 2 or four tabs that bolts to the four crank hub bolts tha thold the balancer

this would be the easiest and most universal option
 
Ryan,
I think your issue with the signal is not strong enough.. need a way to amplify the signal.. I was going to try to send the signal into a transistor, and use it to acivate the tach.. (gasser tach) but the number of notches for the sensor I was not too sure about.. the gasser tach is getting a signal from every cylinder..
Thinking it might work in the 4 cylinder postion if the Dampner has 2 notches. (I'm thinking out loud here.)
Gasser 4 ignition events (one revolution of the cam.) = 2 of the crank.= 4 out put signals to the tach.
Diesel 2 crank rotations w/2 notches on the dampner = 4 output signals..

I'm guessing that is what you were trying.. I have all the stuff to try it on a stand.. just never found time to try it.. I might have some time next week to try it with the transistor..
Bryan
 
my suggestion would be a simple drill and tap hole over the IP pump gear and a sensor just like the Powerstrokes use - it reads the pump gear teeth

I am making up a similar setup on my cummins conversion as we speak.

The other option is a bolt on plate with 2 or four tabs that bolts to the four crank hub bolts tha thold the balancer

this would be the easiest and most universal option

I agree.
To me that's where making a tach calibratable would be nice.. you could run either, and make it work on multiple input devices.. or signal devices..
 
Dakota digital already has two variations of gasser tach convertors available
one is about $59 and the other is $120? depending on application
 
Ryan,
I think your issue with the signal is not strong enough.. need a way to amplify the signal.. I was going to try to send the signal into a transistor, and use it to acivate the tach.. (gasser tach) but the number of notches for the sensor I was not too sure about.. the gasser tach is getting a signal from every cylinder..
Thinking it might work in the 4 cylinder postion if the Dampner has 2 notches. (I'm thinking out loud here.)
Gasser 4 ignition events (one revolution of the cam.) = 2 of the crank.= 4 out put signals to the tach.
Diesel 2 crank rotations w/2 notches on the dampner = 4 output signals..

I'm guessing that is what you were trying.. I have all the stuff to try it on a stand.. just never found time to try it.. I might have some time next week to try it with the transistor..
Bryan

Sounds good Bryan, let me know if that works. Thats the one test i didnt get to do is vary from 4/6/8 cyl. due to this old tach didnt have the previsions to do so, its a 8 cyl. set up only i suppose, old AM 5" w/ shift light.
I had also thought of the idea of a plate or the like in front of the dampner but its not flat like the small and big block chevys that im used to dealing with with like a crank trigger wheel, the 4 bolts are recessed up in the dampner a ways on the cummins, so a nice offset wheel or such would have to be rigged up.... thoughts?
 
The Autometer pickup need 4 tones to pick up off of, they dont need to be magnets only need a rise in the crank or notches to break the signal. I have done both and works both ways. For a Fluidampr I have welded 4 small pieces to it evenly spaced and wored fine. I did a 24v that accually needed 58 teeth for going in to a 6.0 Ford truck and notched the balancer with 58 notches.

Would be great to have more options with somthing like a white face instead of teh ugly AM procomp. Also better lighting, nice back lite instead of the goofy front bulb that the AM has.

Pick would be nice to have something adjustable for different signals. 12v has a single notch, 24v I think is like 13 on the cam and cr's are 60-2 (58 tooth). One gauge for all thats plug and play woul be sweet.
 
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