Failsafe Wideband RPM signal problems with Lucas Distributor | AEM
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skolawn
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Joined: 07/08/2014 - 04:06
Failsafe Wideband RPM signal problems with Lucas Distributor

Hi we have just fitted one to a classic mini which uses Aldon Ignitor (petronix ignitor I think its called in USA) distributor, which appears to give a analogue ignition signal which is fine of RPM gauges but giving a wrong and spiking RPM signal to the Failsafe wideband, it would appear we need a square wave RPM for the Failsafe? 

I have been hunting arround, and cannot find an off the shelf converter but various suggestions on using diodes and such like to smooth the signal.  I would prefer a definitive solution or a unit to plug in.

has anyone got any experience of solveing this problem?

Thanks in advance.

Paul

 

AEM_NS
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Joined: 06/06/2014 - 09:31
I haven't tried this

I haven't tried this personally so can't guarantee that it'll work but something like the MSD GMR Pickup might be worth a try.

skolawn
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Last seen: 5 years 12 months ago
Joined: 07/08/2014 - 04:06
Hi what is the RPM whire

Hi what is the RPM whire expecting to see 12v pulse in square wave or 5v pulse? 

The advertings info and the instructions with the unit really need clarifying so you know whats needed.

I have found http://www.autosportlabs.net/CoilX#Theory_of_Operation a unit that cleans up the signal think this will work? the MSD unit is pretty pricey to just try and it might work.  The best solution would be to include an analogue to pulse converter in the package.

Paul

AEM_NS
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It doesn't specify either 5v

It doesn't specify either 5v or 12v because both are acceptable.  That CoilX thing might work but where would you get a clean 5v reference from?  While an A-to-D converter would be helpful in this case, it'd just be an additional cost expense that would drive up the price for all the other applications that don't need one.   

rfugate2002
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Joined: 08/31/2014 - 19:45
I bought the afr wideband

I bought the afr wideband failsafe gauge over a year ago, and have since gone thru 3 of these trying to get the rpm to work. I've read on other forums that you cant use the coil wire (mustangs) to tap into one of the injector wires for your rpm pulse. I beyond frustrated with this gauge as the tech support has been one of the worst I have seen. No one knows whats going on when you call and try to fix this problem nor do the reply to emails. I have tried both the coil wire and injector wires with no success. My second gauge worked off the coil wire for the rpm for about 5 minutes, then just stoped. I keep thinking I'm getting bad gauges some how but I keep reading on more and more forums that this is an issue.

 

AEM_NS
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Sorry that you're having

Sorry that you're having problems but the WBFS requires a fairly clean square wave input which tapping off the coil negative isn't likely to give you.  There's a chance that connecting the gauges to a fairly high current signal may have damaged them.  Contact tech support for a return authorization so we can get those units replaced.  Have you tried using a tach adapter like I suggested earlier in this thread?