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M-Style Temperature Based Variable Redline Retrofit in Stock Cluster
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04-15-2019, 10:07 PM | #1 |
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M-Style Temperature Based Variable Redline Retrofit in Stock Cluster
I successfully managed to modify my stock cluster to have the M style temperature based variable redline sweep. I had to harvest a stepper motor, and backing plate+ the ring gear to make it work. Only minor coding is needed to activate the sweeping redline.
This method avoids any issues using an entire M cluster (ie. unable to write VIN or mileage without special tools), and you retain your appropriate tachometer dial instead of a 9K one on a 7K motor. Parts needed:
Tasks:
What is not covered:
See the link above to:
Let's Begin. You should now be looking at this: Notice the speedometer side has a stepper motor and upper gear for the cruise control sweeping backing plate that the non-M tachometer side doesn't have, but the cutout/solder points are already present? This is part 1 of our problem. We need to transfer this motor and gear over from the M cluster's either cruise control or redline side onto our non-M cluster.
Coding:
Turn the car off, and restart it and enjoy your retrofitted variable redline in your original cluster!
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'16 M3 | '23 718 Spyder Past: E92 M3, F87 M2, E39 M5, etc Last edited by 6ixSpd; 04-16-2019 at 03:10 PM.. |
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04-16-2019, 07:19 AM | #2 |
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This is a great write-up for a mod many of us have been wanting to do without the M3 gauges. Thank you!
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04-16-2019, 08:09 AM | #3 |
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Very nice write up, thanks for taking the time to document it for everyone!
How did you determine what values to put into the RPM and step boxes? I ask because I'm considering doing something similar but I have a 335D. Being a diesel, these values should be different. |
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04-16-2019, 08:45 AM | #4 |
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Very cool!
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04-16-2019, 02:52 PM | #6 |
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Nicely done, good DIY. The only catch is finding a non working M3 cluster for parts. It's not very cost effective to tear up a good M3 cluster.
But if you guys are going to tear up good M3 clusters I might be interested in the leftover parts.
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04-16-2019, 03:09 PM | #7 | ||
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Glad to help, guys!
Quote:
Key point: the RPMs discussed for the scaling are with respect to where the yellow part of the redline starts, not the red part. Ie. The M3's 5600 RPM cold start range effectively means the yellow is at 5600, which means the red part is actually 6000. And this is actually exact how the M3's redline looks when cold. I don't know how accurate the scaling goes from there, it's certainly not tied to oil temp. Even on the M cars, the oil temp is still rather low yet the variable redline moves to the warm temp way too soon... If I discover any more info on the steps and scaling to slow it down, I'll update the thread. Quote:
Interestingly enough, you can use another non-M cluster to harvest the cruise control stepper, ring gear, and backing plate. But then you have to make a new printed sticker for the yellow and red portion. Certainly doable though, as the hardware is 100% identical. The M3 specific backing plates just has a different print.
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04-16-2019, 07:28 PM | #8 |
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Why not just....
Buy a working m3 cluster. Swap the eeprom chip, and code? I mean. You already do soldering with this job.... Soooo? Unless I'm way off |
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04-16-2019, 10:50 PM | #9 |
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Also, if anyone has a M3 cluster retrofitted to their non-M and also has the coding cable and software, please send me a PM!
I have a small request regarding the scaling that is super straight forward.
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04-17-2019, 03:26 AM | #10 |
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Quick question: does this mod just shift the position of the rev limit markers in the dial, or does it actually change the operation of when the rev limiter kicks in to a lower limit?
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04-17-2019, 02:49 PM | #12 | |
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Quote:
Replied, thanks!
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04-18-2019, 12:06 AM | #13 |
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So part of this is the custom faceplate which I dig. But correct me if I'm wrong: Don't the gauges do the same thing (I know LCI does), just with 5 white lines instead of the red colored circle/arc? The variable redline is based on operating temperature, correct?
Would an easier or comparable way be getting an LCI setup and changing the revline wheel? I know VIN issues would still be the same if you're swapping completely. Or is this the startup sequence sweep for show that this really accomplishes (vs temp based positioning)? |
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04-18-2019, 01:55 AM | #14 |
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LCI or not, the stock redline does not move. No idea where you're getting that from.
Read my post in full, the explanation is already there.
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'16 M3 | '23 718 Spyder Past: E92 M3, F87 M2, E39 M5, etc Last edited by 6ixSpd; 04-18-2019 at 02:02 AM.. |
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04-18-2019, 10:13 AM | #15 | |
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Quote:
Someone correct me if I am wrong. This is how I understood it.
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04-18-2019, 10:58 AM | #16 | ||
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There is no "trick" startup sequence where it does a "test race" — similar how cars like the STi used to do a fake rev gauge race at startup. Incidentally, time to his Vegas or Macao (see milage) |
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04-19-2019, 11:58 AM | #17 | |
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05-08-2019, 01:07 PM | #19 | ||||
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I thought I saw it somewhere, but do you have a DIY for the oil-temp coding? |
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06-17-2019, 05:50 PM | #20 |
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Could you just recode and swap gauges to a virginized m3 cluster?
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06-17-2019, 06:19 PM | #21 |
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What would be the point if you already have a virginized M3 cluster? Once you default code it to your car it all works correctly. Speedo and oil temp scaling is correct. If you wanted to move the variable redline cold start point you would use Perfekt Toolbox to adjust it.
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06-17-2019, 07:57 PM | #22 | |
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