58 tooth or 24 tooth reluctor wheel?
Thread Starter
Joined: Nov 2004
Posts: 998
Likes: 19
From: Rotterdam, New York
58 tooth or 24 tooth reluctor wheel? I'm getting ready to purchase a forged crank for my boosted 6.0 build and I was curious if there is any benefit to running a 58 tooth reluctor wheel instead of the 24 tooth? I have a Holley Dominator EFI system, so I can run either one.
I found this in a search
The 58x actually has less position information for the ECM compared to the 24x wheel. The 24x wheel is actually two wheels with two different patterns. To make up for the lost position information on the crankshaft reluctor wheel GM added additional position information to the camshaft reluctor wheel.
The two will make the same power. More aftermarket engine management systems can understand the 58x crank wheel (60 tooth less two teeth) but several aftermarket systems can understand the 24x wheel now.
If you want to be able to go to mechanical throttle using OEM electronics then you want the 24x reluctor wheel. None of the GM ECM's support mechanical throttle and 58x. On the other hand you can do electronic throttle or mechanical throttle with the 24x reluctor wheel.
If you want to control an electronic transmission you can get a single module (a Powertrain Control Module, PCM) to control the engine and transmission. With the 58x crank you will need an ECM and a TCM.
On the other hand if you want to run the newer 6spd automatic transmission (6L80 or 6L90) then you will want a 58x crank because the T43 TCM that controls those transmissions is normally combined with a E38 or an E67 ECM (both 58x ECM's).
Lots of other small plusses and minuses exist for each but in the end you can make either one work in most custom applications.
Hopefully some of that information is useful and I haven't made this more confusing.
The two will make the same power. More aftermarket engine management systems can understand the 58x crank wheel (60 tooth less two teeth) but several aftermarket systems can understand the 24x wheel now.
If you want to be able to go to mechanical throttle using OEM electronics then you want the 24x reluctor wheel. None of the GM ECM's support mechanical throttle and 58x. On the other hand you can do electronic throttle or mechanical throttle with the 24x reluctor wheel.
If you want to control an electronic transmission you can get a single module (a Powertrain Control Module, PCM) to control the engine and transmission. With the 58x crank you will need an ECM and a TCM.
On the other hand if you want to run the newer 6spd automatic transmission (6L80 or 6L90) then you will want a 58x crank because the T43 TCM that controls those transmissions is normally combined with a E38 or an E67 ECM (both 58x ECM's).
Lots of other small plusses and minuses exist for each but in the end you can make either one work in most custom applications.
Hopefully some of that information is useful and I haven't made this more confusing.
Thread Starter
Joined: Nov 2004
Posts: 998
Likes: 19
From: Rotterdam, New York
Hmmmm... from that write up it almost seems like the 24 tooth is the better choice for my combination. I would think more is better but...... ??? I'm most concerned with controlling spark and such under boost. I would hate to get a scattered signal on a pass and hurt something.
There's nothing wrong with either of them..
The 58 has the benefit of a 4x cam sensor to go with it.. which equates to a faster start..in as short as 1/4 revolution instead of a full revolution with the 1x cam sensor and the 24x crank.
I have a 24x crank in my engine.. because I had an ecu that had a 24x operating system.. now I have a Holley EFI system... and it no longer matters which one I use..
Both of them work equallly as good..
My car starts instantly.... and I spin it 8000 rpm on a regular basis with zero issues....with a 24x reluctor and a 1x cam sensor...
The 58 has the benefit of a 4x cam sensor to go with it.. which equates to a faster start..in as short as 1/4 revolution instead of a full revolution with the 1x cam sensor and the 24x crank.
I have a 24x crank in my engine.. because I had an ecu that had a 24x operating system.. now I have a Holley EFI system... and it no longer matters which one I use..
Both of them work equallly as good..
My car starts instantly.... and I spin it 8000 rpm on a regular basis with zero issues....with a 24x reluctor and a 1x cam sensor...
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From: Norn Iron
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the failures of a few does not equate to a common problem
plenty of people going fast with a 24x reluctor.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
But that's hardly a good argument for going back to them.
That still doesnt mean it's a good system when you know there are better options.
