Logging Speed MPH stops increasing at 158 and I can't figure out why

[mjmenke1]

I'm at the Wanna Go Fast 1/2 event and preparing for day 2 in the AM. Reviewing my logs today, for some my Speed MPG goes to 158 and stops logging any high MPH. Its set to log up to 200, I can't figure out why it stops there. Any help is greatly appreciated, I've attached a log that I ran 170 on according to the event.

Thanks,

Mike

[wesam]

I had the same problem last year in half mile event
But i dont know why it stop at 158

[GMPX]

If that is the SAE.VSS PID unfortunately that is the upper limit of the PID itself, it is not an EFILive error.

[wesam]

Is there any other PID you advice us to log ?

[GMPX]

Some of the E38 and E67 vehicles may support these two:
E38.VSS_DMA
E67.VSS_DMA

That will go all the way up to 255 MPH.

Cheers,
Ross

[wesam]

No thing for LS1B ?

[GMPX]

No sorry, nothing for LS1B.

[minytrker]

Some of the E38 and E67 vehicles may support these two:
E38.VSS_DMA
E67.VSS_DMA

That will go all the way up to 255 MPH.

Cheers,
Ross

Thats good to know, I'll try those for E38. We run 2 C6 Z06 in the Texas mile and they both run 200+mph and the pid I was logging stops at 158, which is a pain. I never tried a different PID since I was used to the ls1 pcms stopping.

[SS2win]

How about creating a calc pid? click me (https://forum.efilive.com/showthread.php?3168-How-to-scan-speeds-faster-than-158-mi-h-(255km-h)&p=31088&viewfull=1#post31088)

[GMPX]

^^ Neat solution

[joecar]

I knew I had seen this before, I just couldn't find it... lol, a ten year old thread.

[Tre-Cool]

Yeah i had to do a similar thing when i was doing some 1km race events. I can't remember the exact math but it had something to do with rpm vs gear ratio & tyre diameter.

http://torqueup.net/downloads/Wyalcatchem%20Race%20Wars/E38_Speed.png

[Blue70SS]

Some of the E38 and E67 vehicles may support these two:
E38.VSS_DMA
E67.VSS_DMA

That will go all the way up to 255 MPH.

Cheers,
Ross

Has anyone confirmed the E38.VSS_DMA works on the E38? (2010 Camaro SS here with an E38)

[Blue70SS]

Yeah i had to do a similar thing when i was doing some 1km race events. I can't remember the exact math but it had something to do with rpm vs gear ratio & tyre diameter.

http://torqueup.net/downloads/Wyalcatchem%20Race%20Wars/E38_Speed.png

How were you able to log gear position? Auto or manual tranny? (looking for manual in a 2010 Camaro, TR6060)

[minytrker]

I never got around to do this so I could log mph higher than 158 but now that we are getting well into the 200+ I should like to log my actual mph. Have a 2006 and 2008 C6Z06 (E38) both manuals with different trans ratios and rear end ratios.

[joecar]

How were you able to log gear position? Auto or manual tranny? (looking for manual in a 2010 Camaro, TR6060)The pid GM.GEAR works with the AT.

[joecar]

I never got around to do this so I could log mph higher than 158 but now that we are getting well into the 200+ I should like to log my actual mph. Have a 2006 and 2008 C6Z06 (E38) both manuals with different trans ratios and rear end ratios.For the MT, you could write a calc pid that uses engine RPM, the axle ratio, and the gear ratio that you would be running in

( or have 6 calc pids, one for each gear ratio )



from the other thread mentioned above:


Hi Blue70SS,

...

so for example (using say 6th gear):

TR6060 6th = 0.63
your rear axle = 3.25

using engine RPM:
gear_ratio = 3.25 * 0.63 = 2.0475
road_speed[mph] = (engine_speed[rpm] * tire_diameter[inch]) / (2.0475 * 336)

using have transmission output rpm:
road_speed[mph] = (trans_output_speed[rpm] * tire_diameter[inch]) / (3.25 * 336)


I don't know if there's a pid for the M6 trans output speed in RPM.


I'm know (pretty sure) that the following pids work only for the AT's:
- GM.TOS
- GM.TIS
- GM.GEAR
- GM.BOXRATIO