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CAGS trick to disable the dreaded 3-2 shift

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Old Aug 1, 2003 | 02:18 PM
  #1  
2002Z28SSConv's Avatar
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CAGS trick to disable the dreaded 3-2 shift

I also posted this in the Computer Diagnostics/Programming section but haven't got much response.

I read about it a few months back but can't find the thread now. What parameters need to be changed? I've heard a few different arguing accounts of how CAGS gets activated.

Some say it's a calculation between speed and load.
Others say it's strictly speed dependant. I know that's wrong.
Others say it's temp/RPM dependant.
Others say it's temp/speed/load(or throttle position) dependant. That makes more sense to me.

So if the last scenario is correct, where can you change the CAGS to activate at >150 degrees/>90 MPH/>85% load? Are those the correct parameters to use?

Assume that LS1Edit will be the tool used to program it.

Any suggestions are appreciated.


Additional info:
I was thinking 85 MPH for the speed threshold. I'll NEVER want to downshift to 2nd or 3rd at that speed.

I don't have LS1 Edit so I don't know what the parameters are called or where to find them.

If I could definatively isolate what parameters the CAGS system uses and where to find them in LS1Edit I can pass this info along to the person setting up my custom tune programming at Diablosport. He said if it was easy enough to set it up he would throw it in there.

One more thought:
As far as the construction of the T56, will activating CAGS while the shifter is already in 3rd cause any damage or lock it in 3rd?

I know somebody has either done this or knows the details I'm looking for.

Thanks,
Chuck
Old Aug 1, 2003 | 02:36 PM
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CAGS only controls the 1-4 upshift, but not any downshifts. The only way not to do the 3-2 shift is to pay attention. I did it one time at 40 mph ( no big deal at that speed), I learned and haven't done it again. Attention is the price we pay for manual transmissions.
Old Aug 1, 2003 | 03:03 PM
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2002Z28SSConv's Avatar
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Take it easy on the "learn to shift" comments guys. It happened once when the car was just over a month old. The tranny has always been very hard to get into gear and it slid from the 4th location into 2nd coming through Nuetral. It always binds for a split second in neutral before going into any gear. I don't drag race the car anymore unless I'm challenged by the owner of another interesting car. It ran 13.3 stock @ 106. That was all I was trying to see. It has done it. I'm happy with that. I don't need to do it anymore. Autocrossing is infinitely more anjoyable to me. So that's what I do. Wanna see if I can shift? Come on out! I want to see if you can steer? (No flames intended - BTW)

The question still remains the same. I have a system already in place in the car that can be altered and used for a good purpose. Therefore I would like to do so.
Old Aug 1, 2003 | 03:11 PM
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2002Z28SSConv's Avatar
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I may have found my own answer at www.ls1.com. I didn't do a search there before because their search function used to be pretty limited. Before I posted there though I figured I would take my own medicine and do what I tell people here to do all the time. My search came up with this to disable it completely:

bump speed way up 200/201
kpa load leave the same
enable temp 275
and throttle % way down 5

Pretty much impossible to satisfy all these settings at one time


So if I ...
bump speed up to 84/85
change kpa load to 85% (is it a % based parameter?)
change enable temp to 150
change throttle % to 90

...it should work, right?
Old Aug 1, 2003 | 03:26 PM
  #5  
2002Z28SSConv's Avatar
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Originally posted by SSCamaro99_3
CAGS only controls the 1-4 upshift, but not any downshifts.
Okay, I thought this was false. So I just went out and shifted from 1-4 with CAGS light on and tried to shift back from 4-3. No shifty! So even going from 4th back to 3rd (a downshift) CAGS effectively blocks entry into 2nd and 3rd gear when it is enabled.

I still need to know if it will cause any damage to the solenoid if 3rd gear is already engaged when it activates and whether or not it will lock the shifter in 3rd gear.

Thanks again.
Old Aug 1, 2003 | 06:30 PM
  #6  
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Originally posted by 2002Z28SSConv
I still need to know if it will cause any damage to the solenoid if 3rd gear is already engaged when it activates and whether or not it will lock the shifter in 3rd gear.

Thanks again.
That's what I was wondering when I read the first post...I have no idea.

I have yet to do a 1-2-1 or a 2-3-2 @ WOT in this car so I'm not really worried about it (knock on wood)...but I guess it would be nice to have a little peace of mind. Let us know what you find...and especially if Diablo can do it. I need to run over there sometime soon so they can delete my rear O2s and I guess I'd have them do this little CAGS mod too (if they can).
Old Aug 1, 2003 | 09:19 PM
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The CAGS soleniod pushes out a large pin & simply does not allow
the shifter to go in the rear 1/2 shift gate position.(2nd gear only)
Old Aug 1, 2003 | 10:39 PM
  #8  
2002Z28SSConv's Avatar
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Originally posted by wrencher
The CAGS soleniod pushes out a large pin & simply does not allow
the shifter to go in the rear 1/2 shift gate position.(2nd gear only)
Can you please explain that in a bit more detail?

I don't know what you're talking about by "rear 1/2 shift gate position. (2nd gear only)".
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