Throttle Cracker - No CPP due to being a Holden PCM

[bimbleuk]

I've got some low speed surge on a mildly cam'd LS1 (M6 - manual).

I've rear several thread and understand how the TC & TF might help with this.

However I've logged the IAC_TC_DMA & IAC_TF_DMA on both a 1221256 & COS5 OS the TC PID is showing basically zero adjustments. The TF is adding air to match any changes I make to tables.

As I don't have a CPP switch or the wiring as I'm using a Holden based wiring loom & PCM. Maybe an automatic OS might get the TC tables working again?

Any other suggestions would be appreciated.

[bimbleuk]

I think I'll try the 12225074 OS which was originally on my PCM.

I have a choice of two files one from an auto and one from a manual. Is there actually a difference in the software? Both are 12225074.

[joecar]

Is there a way to add a CPP switch...?

[bimbleuk]

Is there a way to add a CPP switch...?

I will check at the weekend as I'm not near the car but there may not be a pin on my connector. On the Holden autos that pin is Blue/White and connects to PRNDL A.

So I may be able to add a pin and use the 1221256 OS but I've got a custom converted car with a bias pedal box and it's a lot more hassle than finding an OS that will work without one. I'll try the Holden OS on the PCM and post back the result.

[bimbleuk]

OK so I copied over all the tables from 1221256 LS1B 512K PCM to my original Monaro (Holden/HSV) 12225074 LS1B 512K tune which took a while!

I reprogrammed the PCM with the new OS and went for a drive. Immediately I could see the IAC_TC_DMA PID was logging consistent values and my surge has 99% gone. I have some transmission slop so it will never be perfect and there may still be some fine tuning but I now have the Cracker tales working without a CPP clutch switch.

Maybe this is worth a sticky?

Only downside is the LTFTs have shifted a bit so it probably needs a few CALC.VET etc. runs to get them close again.

[joecar]

OK, stickied (and I'll work it into the collected links thread).

[Highlander]

I can actually change in the cal to eliminate the CPP.

[Happy Jim]

I can actually change in the cal to eliminate the CPP.

Interested how to do this as my retrofit also doesn't have a CPP - can you share?

Thanks

Jim

[Highlander]

No, cannot, but I can fix it... send email to desaintpreux at gmail dot com.

[Happy Jim]

No, cannot, but I can fix it... send email to desaintpreux at gmail dot com.

Mail sent

Regards

Jim

[Highlander]

The CPP is disabled in this calibration.

[Highlander]

Is this a manual car?

[Happy Jim]

Hi, Yes mine is manual

[Highlander]

So you need me to enable the CPP switch?

[Highlander]

There are 2 modes for the switch... 1 to ground 2 to ign... which is it you want?

[Highlander]

Throttle Cracker is disabled...

you have b4311 b4312 maxed out.... what cam is in this car?

[Highlander]

What transmission do you have? Gear ratios????

[Happy Jim]

Hi Christian, I have no CPP switch fitted in my car, as long as the ECU isn't "expecting" an input then all is good (I have a feeling that from what you've said above that may already be the case....in which case I apologise for wasting your time)

Regards

Jim

[Happy Jim]

Throttle Cracker is disabled...

you have b4311 b4312 maxed out.... what cam is in this car?

Thunder Road TR230 (226/230 reverse split off the top of my head)

[Highlander]

No, no problem.. its disabled
but the test is running for CPP OBD2 wise.... I can disable that too.

[Happy Jim]

No, no problem.. its disabled
but the test is running for CPP OBD2 wise.... I can disable that too.

Yes please.

There are times when Virtual Beers would be really handy to give out :-)

[Highlander]

What gear ratios are in your transmission? where did you get this cal from? did you do a segment swap? does your tranny have the temperature sensor?

[Highlander]

Try the file I sent you... has the CCP OBD2 test disabled to be sure... The surging was caused for different reasons... all which i have fixed (hopefully, every car is different).

Basically you had idle closed loop control enabled 100% of the time... that is a completely different routine.

[Highlander]

Sorry,

you have closed loop disabled... any reason why?

[Highlander]

Still.. my changes should fix your surging issues while coasting in neutral.

[Happy Jim]

What gear ratios are in your transmission? where did you get this cal from? did you do a segment swap? does your tranny have the temperature sensor?

2.66:1 1.78:1 1.30:1 1.00:1 0.74:1 0.50:1
Original cal was 2000 Camaro, then upgraded to COS3 (did it a while back so can't remember how, but followed the tutorial),
Tranny temp sensor....nope
CL disabled as I have zero O2 sensors fitted (or cats or anything else vaguely emissions related).

I'll go try the file you sent

Huge thanks

Jim

[Highlander]

Email Resent... disabled O2s Permanently.. disabled heater routines. Disabled O2 Tests... Disabled pretty much any use of the O2 sensors. (it should free some headroom)