Rev Limiter on 85
Le Mans Master
Joined: Jun 2001
Posts: 6,694
Likes: 3
From: Less Talk, More WOT | Houston TX
The feature is available in the chip for both an auto and manual car. You would have to burn a new chip. Another option is installing a MSD digital 6 or soft touch rev control ignition controller. I am pretty sure both of these allow for a rev limit to be set.
Melting Slicks
Joined: Aug 2003
Posts: 3,401
Likes: 397
From: Lakeville MI
The $1F xdf file I have only lists a speed based fuel cut.
It should be possible to convert this to an rpm based limiter if you hack in the address of the rpm signal instead of the mph signal and correct the resolution.
I thought I saw a patch for this somewhere.
It should be possible to convert this to an rpm based limiter if you hack in the address of the rpm signal instead of the mph signal and correct the resolution.
I thought I saw a patch for this somewhere.
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Get the latest def file from TunerCATS. The $1F file is currently at revision W. Just email TunerCATS. See under "ECM Constants" table: "Highway Mode Spark RPM Disable Thresh" is set at 6350 RPM. Haven't been able to confirm but I think this is the rev limiter.
Le Mans Master
Joined: Jun 2001
Posts: 6,694
Likes: 3
From: Less Talk, More WOT | Houston TX
Highway spark is different from rpm limit. Sorry to the original poster, my 6E chip has an rpm and speed limit available and I assumed yours was the same.
Melting Slicks
Joined: Aug 2003
Posts: 3,401
Likes: 397
From: Lakeville MI
Here's an example of how to do it:
http://www.thirdgen.org/techboard/di...thod-demo.html
You need to find the correct addresses in your $1F bin to follow this example. The mph limit values are easy to obtain from a TunerPro xdf.
LC3B2: 255 mph to stop fuel
LC3B3: 254 mph to restore fuel
These will need to be converted to rpm limits
Now you need to find the correct ram addresses of the mph and rpm/25 signals in $1F.
Sorry I don't have them readily available. Somebody should have a good $1F disassembly. Anyone?
http://www.thirdgen.org/techboard/di...thod-demo.html
You need to find the correct addresses in your $1F bin to follow this example. The mph limit values are easy to obtain from a TunerPro xdf.
LC3B2: 255 mph to stop fuel
LC3B3: 254 mph to restore fuel
These will need to be converted to rpm limits
Now you need to find the correct ram addresses of the mph and rpm/25 signals in $1F.
Sorry I don't have them readily available. Somebody should have a good $1F disassembly. Anyone?
Last edited by tequilaboy; May 1, 2007 at 05:01 PM.
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Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia