60-2 crank sensor wheel

[safe]

Hi
I'm planing on getting an Emerald EFI for my 3.2 motor and I would like to use a crank trigger and coil pack setup.
The 3.2 has a 129+1 tooth flywheel sensor that is quite useless on anything but the stock motronic from what I heard.

Is there any aftermarket 60-2 trigger wheels that I can put om the flywheel instead of the "+1" ?

I have seen things that you put on the pulley, but that looks a little fragile if you ask me, I know what a broken fan belt can do...

[1972_911T]

Check out clewett's website they sell electromotive stuff that im sure uses 60-2 also check our host as they sell electromotive as well.

Steve

[David]

If you go with Motec, it can read just about any number of teeth.

[MBruns]

Have your flywheel machined to make it what you need, we can do it if you like
Mike Bruns JBRacing.com

[TimT]

You can use a trigger wheel on the crank pulley with no worries. We have many cars with 60-2 trgger wheels mounted on a crank pulley

[safe]

Originally Posted by MBruns

Have your flywheel machined to make it what you need, we can do it if you like
Mike Bruns JBRacing.com

That would be the cool thing to do, if you ask me. Thank you for offering, but the shipping would kill me!

The Electromotive pulley looks sturdy.

What do the 3.6 conversion guys do? They can't use the 3.6 flywheel and clutch with a 915 box, can they?.

[MBruns]

If your system can use the Porsche sensor with the modified tooth pattern that would be hard to beat overall, there are alot of reliability issues with the electromotive sensors, the conversion guys are either using the G 50 or a Patrick Motorsports flywheel, we make a flywheel that will work but it is a race only 5.5 "multi disc unit.

Mike Bruns

[safe]

Originally Posted by MBruns

If your system can use the Porsche sensor with the modified tooth pattern that would be hard to beat overall, there are alot of reliability issues with the electromotive sensors, the conversion guys are either using the G 50 or a Patrick Motorsports flywheel, we make a flywheel that will work but it is a race only 5.5 "multi disc unit.

Mike Bruns

Are the issues with the electromotive sensor itself or the sensor-by-the-pulley setup?
Since it's a street/DE car I like reliability

[MBruns]

We ran the Electromotive systems for years and the biggest failures were the sensors, all the units we ran and others that we serviced were the 60 minus 2 pulley style in 3/8" and 1/2'' sensors, the boxes were the HPV1 they worked good but the later HPX boxes were JUNK, If it were mine I would go with the stock sensor and figure out the flywheel, some of the Motec systems that we used on the 3.8 RSR engines that used the stock flywheel's and sensors we had to increase the air gap because the signal was very strong at the stock gap, then they were happy.

Good Luck with your project, Mike Bruns

[Dennis Kalma]

Is the sensor just looking for a small gap in signal? I am fitting a 6 speed G50 to my '89. was still puzzling over the EFI stuff and prepared to go with the pulley sensor if needed.

I am fitting an early Turbo flywheel, is it possible to just machine grooves in the flywheel flange at the appropriate spacing? Will the sensors (Motec or who's ever) respond to the gap?

Any insight is welcome...

Dennis

[MBruns]

We do a few for the 944 turbo guys that want a 36 minus 1 setup and usually begin with the original tooth and make that one the missing and drill and tap one every 10 deg. screw in an allen set screw or the like and lock tite it in then machine them true on the lathe, that setup works fine when you dont have much room or any trigger teeth to begin with. Each managment system has it preference on tooth count and the type of sync signal to find itself each revolution.

Mike Bruns

[TimT]

Are the issues with the electromotive sensor itself

The sensors had a tendency to fail, especially the older 3/8" sensors, the newer 1/2" sensors seem to be of better quality and are more reliable.

I heard from someone that the original electromotive crank sensors were really an off the shelf proximity sensor that was used for some manufacturing process, not an automotive specific sensor.

[safe]

Thanks everyone, especially Mike. I now know what I can and must do.

I might post a thread later on how the project (EFI with ITBs from a Suzuki on a 3.2) is going when I'm a bit further in it.

[safe]

An update.
Like the cheap bastard I am, money made the decision

I bought a pulley mounted 36-1 trigger wheel and modified the original sensor bracket.

Anyone know why Porsche used a steel sleeve on one of the original 3.2 sensors?

[rvanderpyl]

Which TB are you using? I am going to try out a set from a GSRX 600 which are 38mm, trying on a 2.4 first, and then a 2.7 if that works out.

[safe]

I'm using TBs from 3 Suzuki TS1000 (a v-twin).
They are 48mm, which can probably be a tad to big on an otherwise stock 3.2, but they were cheap and available... The 3.2 might not be stock forever, so I'm building for the future. In either case it will be better than my tired 2.7.