Hello,

While I realize this is a tuning question, I thought I'd get some helpful answers here due to the high HP aspect of it.

Does anyone know the highest HP that was successfully tuned using FI with a factory ECM that supports a 24x reluctor? Is there any benefit/can you switch to a 58x reluctor for more accurate control? I realize changing the reluctor wheel is a big deal, but not so much if you're starting from the beginning.

I realize high HP is subjective. For me I'm thinking over 1000rwhp tuned via speed density.

Curious about your thoughts. TIA!

 

Made 1300rwhp on a billet 24x reluctor and the factory pcm, you will be fine.

 

Thanks for your response. 1300rwhp is a lot of jam!

I wonder what the record with a street car and 24x reluctor?

 

60-2 gives greater resolution in crank angle sensing

but you then need an ECM that makes use of that greater resolution

 

Thanks for your response.

I'm not sure if it's possible to swap my factory ecm with a different version. I'm not sure if I would lose gauges, active handling, etc.?

 

So I'm not sure I have the whole story right but GM went with 24x in the beginning to avoid paying royalties to the 60-2 (58x) patent holder

That they did switch when the patent timed-out makes me think that it was a better system. In theory it provides more data points to the ECM to predict crank angle.

Now if the delphi controls people asked for the switch I have to think there was good reason. What that reason actually is and how the 58x ECM's use that data I have no clue.



I'm sure there's a way to piggy back aftermarket engine management to your stock body control modules, some sort of can-bus translator. But that is way outside my wheelhouse.

 

you might catch a bigger fish with this question over in the PCM and diagnostics section. Some pretty smart fellers lurk over there. I see Banish post once in a while.

 

Thanks! I'll create the thread now

 

As covered elsewhere....

the 24x wheel in itself is not really a limiting factor. The physical wheel may to a degree...but a billet one could sort that

RPM limit within the ecu may be....software may fix that, or there may be hardware limitations in that respect.

I would always choose a different trigger wheel, I just think the 24x is ****...but if that's what the car has and you insist on using an OEM ecu....then just do it.

 

Great. Thank you. All my questions have been answered

 

Why would horsepower have anything to do with this?

 

The more HP the engine makes the quicker it revs during drag racing. I was concerned that there is a speed limitation on how fast the engine can increase rpm under load

 

Yep its called timing.lol.

 

HP could affect crank stability...hence trigger stability, the 24x is poor there.

HP could require rpm's the factory ecu hardware cannot cope with...depends what EFILive or HPT can offer there.

OEM ecu could have boost/tuning limitations...although those would easily be worked around.

depends whether you wanted to make say 2000hp at 6000rpm, or 10,000rpm for example.

 

Perhaps I should build the engine with a 58x and use the LPE conversion box? This way if I later go to a stand alone I don't have to swap the reluctor wheel?

https://www.summitracing.com/parts/l...SABEgJ28fD_BwE

I've heard good and bad about the lpe conversion box

 

the bad about the box was in the initial production. I believe its been revised and they work well and are reliable. I installed one in a car 5 years ago and no hiccups to date.

 

There is no way I would ever trust something like that, for something as critical as crank position triggering.

 

I am not using the factory pcm any longer. I am running an ms3 evo so depending on who you talk to that is worse lol. jk.

I am running 7.7/7.8@180-181 1/4's and been 206mph with a gm 24x reluctor. Not the billet. Its been good to me for two years straight.

From personal experience the only time Ive had issues in the past was timing control with my previous 0411 at 7,500-8,000 rpm. I ran my car for 6 months up to 7,500 without issues. Id run it out to 7,8-8,000 and pop headgaskets within seconds. 25-26 psi and 15 degrees, 12 degrees, 10 degrees ... didnt like those rpms. That is the issues Ive seen. Rpm more than power with the factory gm units.

 

Thank you for the info, that's very helpful!

Mental note to set rev limiter to 7500!

 

I have had no issues with oem gm 24x crank reluctor wheel up to 8100. I use Holley efi.