24x Reluctor Wheel 58x PCM Programming Fix?

[jad568]

I'm looking to install a nicely built LS2 into my 07 Z06. The issue is the LS2 has a 24x reluctor wheel and 1x cam gear and my PCM is obviously looking for 58x / 4x wheel/gear signals. I was planning on using the LINGENFELTER converter box but it now sounds like they are on hold pending more testing!

Sooooo, I don't really want to pull the crank to get a 58x wheel pressed on so I'm wondering if anyone has had any luck at getting to the PCM programming to make the change there?

I've heard of this being done with "other" tuning SW but my tuner uses HP so I'm hoping someone has figured out a way around this problem.

Thanks,

-John

[thesubfloor]

I'm looking to install a nicely built LS2 into my 07 Z06. The issue is the LS2 has a 24x reluctor wheel and 1x cam gear and my PCM is obviously looking for 58x / 4x wheel/gear signals. I was planning on using the LINGENFELTER converter box but it now sounds like they are on hold pending more testing!

Sooooo, I don't really want to pull the crank to get a 58x wheel pressed on so I'm wondering if anyone has had any luck at getting to the PCM programming to make the change there?

I've heard of this being done with "other" tuning SW but my tuner uses HP so I'm hoping someone has figured out a way around this problem.

Thanks,

-John

I'm glad you decided against the Lingenfelter box as I used one in a buddy's car and it was a complete POS, leaving him stranded multiple times in a single week.

[jad568]

I'm glad you decided against the Lingenfelter box as I used one in a buddy's car and it was a complete POS, leaving him stranded multiple times in a single week.

Very interesting, I'm really hoping to find a programming solution. I guess worst case I will be swapping out the reluctor wheel and cam gear.

[thesubfloor]

Very interesting, I'm really hoping to find a programming solution. I guess worst case I will be swapping out the reluctor wheel and cam gear.

That's what we ended up doing.

[jad568]

That's what we ended up doing.

I know one of the EFILive tuners was able to "edit" the file to overcome this issue, I just haven't found anyone who has done it with HP....YET

[doc350]

i just finished up a car using the lingenfelter box and it seemed to work alright. although this was a c5 vette with a ls3, so it was converting the opposite way you are.

one downside to the lingenfelter box, is that i was never able to get the car to start right up. it seemed like the box needed a few rpms to pick up and convert the signal.

as far as i know, even efi live has no way to change the signal to work with a different pcm.

[IDRIVEAG8GT]

Pull the crank, change reluctors, go. Screw the box.

[LSxpwrdZ]

Aparently it is possible to go from 24x to an E38 but not a 58x to a 0411 or the like....

[MikeOD]

Based on what I'm being told, it can be done with an E38 or an E67. I'm becoming very interested, as I'd love to use a newer/faster/better/more capable PCM to run my turbo engine.

[LSxpwrdZ]

I'm thinking the same thing... I've thought about running it on my 427 106mm 6spd setup. I'm just wondering what kind of task it'll be if even possible to keep factory gauges in a 4th gen Fbody and utilize an E67/38. Put a card MAF sensor in a 4.5" charge pipe and let her rip! Be really awesome considering the newer OS's have 4096g/sec of headroom before scaling.

[MikeOD]

I'm thinking the same thing... I've thought about running it on my 427 106mm 6spd setup. I'm just wondering what kind of task it'll be if even possible to keep factory gauges in a 4th gen Fbody and utilize an E67/38. Put a card MAF sensor in a 4.5" charge pipe and let her rip! Be really awesome considering the newer OS's have 4096g/sec of headroom before scaling.

I think you'd only have to worry about injectors for scaling, not the MAF table...but 127 lb/hr is a LOT of fuel...even if you run it on E85 lol. I can't see many setups ever approaching the limit of the MAF table.

[MikeOD]

I found this thread saying that there's a 3800 OS that has a setting to switch to 58x or 24x http://forum.efilive.com/showthread....and-Vice-Versa

[MikeOD]

I really don't even think this is a code patch, I think it's a table in the OS that you can select the crank/cam trigger combo style that we just don't have access to...yet. I wish I had access to the PCM without encryption, I'd try to find the locations of the table(s) to make it easier to add. The people I've talked to who've said they've done it have essentially said just that.

[Ben Charles]

Didn't even think about using a 24x with a E38 computer? You would have to use a DBW TB, hmmmm.

[ScarabEpic22]

The only ECM Ive heard that can do this is the GMPP one, supposed to be a 1-size-fits-all ECM for any engine swap. I.e. grab a junkyard engine, hook the GMPP ECM up, tune it and go.

I dont know of any factory OSs that have this ability, if someone has done it then they've spent some time working in hex getting it to work.

[ScarabEpic22]

The GMPP is just a E67. The E67 and the E38 are capable or running a 24x wheel.

Well its E67 hardware with a custom GMPP OS...and we all know that the OS is the critical aspect. Hardware is important, but considering GM uses a few hardware p/n's and tons of OSs, the OSs are the make-or-break aspect.

Care to share E38/E67 running a 24x reluctor with a factory OS? If it can be done, it'd be valuable info for the site.

[ScarabEpic22]

I have seen instances where the same tables are empty in 1 platform and fully populated in another, so that makes sense.

Sounds like you've been digging around in hex/assembler figuring this stuff out!


All good about the ass comment, I was being a little snarky when I posted before. All good, I appreciate the honest reply.

[Jabbott]

Actually they should not be different from one platform to the next. What that tells me is there may be and offset issues and the address is not lined up properly. Hopefully in that situation is a blank area of the ECU so if you populate it nothing will happen.

Sounds like you've been digging around in hex/assembler figuring this stuff out!

Something like that.

[Chris@HPTuners]

there are some values that can be changed but its something we never looked into after talking with some people who know.. The system was never designed for 24x, only 58x and a couple of different cam sensor options.

Not saying it can't be done, but it's not as simple as changing a value from 58 to 24. For example, the value that tells you how many teeth are on the relulctor is actually 60 and there are a few other things that need changing.

The things is that the crank pulse not only tells the engine RPM, but it is also used for triggering code loops for spark, fuel, dod, cam phasers and a whole bunhc of other things that need to be calculated prior to delivering fuel pulses, spark etc.

If someone wants to experiement i'm open to it.

Let me know an OS you can test with and i'll add some things to play with.

Chris...

[Chris@HPTuners]

email me a file that works and i can add it in 5 minutes.