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I have sent an email to Maggs and Granitali requesting contact and technical info. Let’s see what happens. I also found these people: https://gmgaugespecialists.com/produ...nd-firebird-v8
Since they are making custom overlays, I don’t why they can’t just print out a 200 version and let people have different redlines on the tach. Let’s see what they say. As far as the calibration goes, I am a 36 years Instrument Technician in chemical plants and refineries. Too calibrate the gauges I will just need to know what kind of signal generator that I would need.
Did you ever hear from these folks?
Last edited by Trans Am WS6 420; 12-06-2023 at 02:23 PM.
Reason: Can't speel
Wouldn't you just increase your current pcm output by 33.34%? Since the scale changes 33.333%.
or maybe subtract. I'm not really sure how that one works.
mine shows 4,000 pulse per mile right now. At 60 I'm like 3 mph high.
Wouldn't you just increase your current pcm output by 33.34%? Since the scale changes 33.333%.
or maybe subtract. I'm not really sure how that one works.
mine shows 4,000 pulse per mile right now. At 60 I'm like 3 mph high.
Interested in this. $550 for the gauge overlay + ~$400 to calibrate is pretty painful.
Wouldn't you just increase your current pcm output by 33.34%? Since the scale changes 33.333%.
or maybe subtract. I'm not really sure how that one works.
mine shows 4,000 pulse per mile right now. At 60 I'm like 3 mph high.
The car will count mileage incorrectly and your shift points will be wrong if you've got a PCM controlled auto.
The car will count mileage incorrectly and your shift points will be wrong if you've got a PCM controlled auto.
the transmission doesn't shift based off of pcm output it uses vss which is a pcm input. Output is just for speedo and abs. And if your scale changes it's entirety 33.333 percent then changing the rate that the cluster input is received by that same amount it should be dead on.
the sweep is the same but there are 33.333 percent more numbers.
I have a Granatelli overlay on a normal gauge cluster that I bought years ago. Supposedly the cluster itself needed to be calibrated (mine wasn't so the MPH was incorrect when installed in the car). Still have the overlay and gauge cluster in storage lol.
Cluster, cruise, radio.
Like i said. Mine is like 3mph off at 60 so i will do the math on that one later and calibrate it for that. Its not rocket surgery, it's just conflicting info based on what used to be the only options vs what is now optional with new technology.
the transmission doesn't shift based off of pcm output it uses vss which is a pcm input. Output is just for speedo and abs. And if your scale changes it's entirety 33.333 percent then changing the rate that the cluster input is received by that same amount it should be dead on.
the sweep is the same but there are 33.333 percent more numbers.
Sorry I thought you were referring to the pulses you can adjust in the tune. When you change pulses per mile, it affects how the PCM interprets the signal from the transmission. You are correct, you can rob the output from the PCM between the PCM and dash but you'd need an interstitial piece of hardware to adjust the signal. The mileage would still count incorrectly though.
Sorry I thought you were referring to the pulses you can adjust in the tune. When you change pulses per mile, it affects how the PCM interprets the signal from the transmission. You are correct, you can rob the output from the PCM between the PCM and dash but you'd need an interstitial piece of hardware to adjust the signal. The mileage would still count incorrectly though.
here is a diagram for every wire that plugs into the cluster.
in order for the pcm to tell the cluster "display this milage" it will need a dedicated communication line. Most cases CAN-C. These cars do not have that luxury in the cluster so ALL of the speed/mileage information that can be displayed to the driver comes from the cluster. So if the count for the speedo is wrong, then so is the odometer by the same amount. If the cluster input from the pcm is calibrated correctly then the needle will be accurate and so will the odometer and trip meter.
on modern cars that do use CAN communication the bcm and the pcm will store milage and have not only a non cluster milage storage, but also a back up in case the other one fails.
I understand it sucks being corrected publicly and you definitely seem to be the kinda person that needs to have the last word. So let's leave it at this. You just got mixed up with old tech vs modern tech.
here is a diagram for every wire that plugs into the cluster.
in order for the pcm to tell the cluster "display this milage" it will need a dedicated communication line. Most cases CAN-C. These cars do not have that luxury in the cluster so ALL of the speed/mileage information that can be displayed to the driver comes from the cluster. So if the count for the speedo is wrong, then so is the odometer by the same amount. If the cluster input from the pcm is calibrated correctly then the needle will be accurate and so will the odometer and trip meter.
on modern cars that do use CAN communication the bcm and the pcm will store milage and have not only a non cluster milage storage, but also a back up in case the other one fails.
I understand it sucks being corrected publicly and you definitely seem to be the kinda person that needs to have the last word. So let's leave it at this. You just got mixed up with old tech vs modern tech.
Figured I was being courteous, apologizing that I misunderstood you. Do your thing, I don't care.
No pass through device needed. It's all on hp tuners.
Yessir, what I was trying to explain was that value does indeed feed the speedo but it also feeds the dash logic controller that counts miles for the odometer. If you modify that value 33% lower to sweep the needle at a different rate, you also count miles 33% slower.
I've been wrong before and I'll be wrong again. Give it a shot and if it works, awesome. If not, I'm sure there's another solution.
Hey guys i own Gmgaugespecialists.com. i make faces for several vehicles including fbodies. I have the faces available to be made and trying to figure out the programming. I've read about doing a tire size with a programmer/hptuners that gets it close. 6le and others have reached out to me about doing it for them but there is way to much price gouging on that. I sell my traditional faces for $120-$135. These will be a $150 plus whatever i figure out for programming. I
12-04-2023, 09:34 AM
