So I have a more or less LS2 with a 24x reluctor wheel. I bought the Holley HP EFI setup for the since I have a front mounted crank sensor. I have a LS1 crank position sensor but just figured out apparently the connectors are different between the LS1 and LS2 crank position sensors. Can I use a 58x crank position sensor with a 24x reluctor wheel?

 

Ive never tried it, but I dont think so.

 

No it will not work, you'll need to buy the engine harness for a ls1 and extend the cam sensor plug. The holley ecu can use either the 24x or the 58x but the two engine harness are different.

 

The harness will work with either crank sensor. Just change the connector. Configure the software.

Tim

 

dont you need to change the crank sensor from 12v to 5v if your going 58x?

 

I was told by 2 different people at Holley on Tuesday that you could not do that because 24x harness is setup for 12v and the 58x harness is 5v.

Correct 24x is 12v and 58x 5v.

 

What year is your LS2? As the 2005 LS2 has a 24x reluctor wheel.

Russ Kemp

 

Doug and Rick both said it would work and on my car it worked great.

I ran my car this way for 2 years.

I then built a 58x motor and just switched the connector back

Tim

 

WTF! I was on the phone with holley for 30+ minutes (dont remember guys name I spoke with) and emailed a guy name Ricky and holley and both said I had to change the whole harness out. I had the engine on the engine dyno all hooked up ready to go when it wouldnt start realized it wasnt 58x. I have 558-103 engine harness if it matters.

 

Rick Anderson is the field rep and Doug is in engineering. This is why I don't call the general tech lines for any product. They are only telling you what the manual says.

Tim

 

They put me on hold for good while checking with someone, so I assumed they were checking with someone who knew what they were talking about. The worst part is all the specs were given to Holley when ordered, have everything on engine Dyno and then Holley said harness won't work. I specifically asked if I could change the plug because I had one there and in email and on phone they said no. So then the engine had to come off engine Dyno and another harness ordered. They said I'll then need to extend the cam sensor harness since I'm running one in front cover. With 2 harnesses and 2 times on the engine Dyno this is a pretty costly mistake using their advice. This is very frustrating.

 

I cut the tap out of the 24x sensor and the 58x connector fits now. Do I need to change the locations of any of the pins or are they the same on both connectors.

 

may need to know about this soon!

 

sub'd.

 

Does anyone know if the pins are in the same location?

 

the connectors work but the voltage will not...

 

So it looks like they pins are in the same location and it does work. I cut off the locating tab that is different between the 24x and 58x connectors and now the 58x connector fits on the 24x sensor. I set the HP efi software to the 24x setting and it looks like its seeing an RPM signal. I will know if its gonna run as soon as I hook up the fuel.

 

you just need to do a little wiring to make it work

if you have an ls2 harness, with a 24x wheel and sensor
you need to run a 12v reference voltage wire to the Crank sensor (the harness you have is currently wired for 5v)

The LS1/LS6 main harnesses are wired for +12V crank & cam sensors.
The LS2/LS3/LS7 main harnesses are wired for +5V crank & cam sensors.

P1A-A22: Cam Signal Input
P1A-A30: Crank Signal Input
P1A-A18/14: Sensor Ground Out
P1A-A26: Sensor +5V Ref Out
P1B-B20: EST +12V Out



LS2/4x Cam sensor is wired
A - 5v ref
B - Ground
C - Signal

LS2/58x Crank sensor is Wired
A - Signal
B - Ground
C - 5v Ref


LS1/1x Cam Haness is wired
A - Signal
B - Ground
C - 12v Ref

Ls1/24x Crank sensor is Wired
A - Signal
B - Ground
C - 12v Ref


the cam and crank reference and ground are tied together in the harness, so you will need to clip/cap off the wire on the crank connector for the 5v for refernce volatge and run a new wire for the 12v reference from the P1B connector


beyond that, assuming you wire it up correctly
you need to use "Custom" for your ignition type
select 24x in the crank section

and you didnt mention what cam sensor and wheel you are using....
but you just need to select the appropriate one(I'm assuming its a 4x sensor and wheel)

you do not need to change the reference angle on the crank sensor, but you may need inductive delay (they typically need around 20u-sec)
to test it... you can just put a mark on the crank pulley...really anywhere will work...
then check it with a timing light...
if it moves forward or back when you rev up the engine while doing a static timing check, then you need to change the inductive delay

and the 4x cam sensor should be set as digital Rising

also, your Dwell time should be in the 3.5~5 msec range (if you have coils with the metal heatsink in the top of them keep it to no more than 4.5ms

 

there are plenty of people at holley who answer the phones, but really dont know about the wiring...they basically only know that one is wired for the 58x/4x combo and one is wired for the 24x/1x combo

they have no knowledge of the individual wiring....


ALL of the Wiring is in the Help Files and you could have read them to discover for yourself that a simple wiring change would have solved your problem

also, dont be afraid to extend wires when necessary
the only wires you cannot extend with solder are the o2 sensor wires. (o2 sensors use the wires resistance to determine free air oxygen content...solder changes it enough to screw it up on the very small scale the sensor is look at)

 

When you talked to their tech support and they say it wont work I am not going to try it and see if it works and possibly mess up a $2k computer that is not mine.
I have since met with Holley and have a direct number to someone there who knows the Holley system so I dont have to go through anything like this again.