Are you running 305/45R17? Question 4u

IneedAZ · 03-19-2021, 06:43 AM

Finally getting mine mounted this weekend and wanted to know what you changed in hp tuners for the speedometer. Could you post a screen shot or what setting you changed. Is it only the the setting that says Dist? What number? 726?

Thanks

IneedAZ · 03-20-2021, 05:17 AM

Anyone? Even if u don't have that size but have different than stock size can u confirm which settings to be changed

wnta1ss · 03-20-2021, 06:53 AM

I have used the 304/45-17 Mickey Thompson ET Street R and it's pretty tall. With my stock-tune SS, A8 trans, it was able to go 116mph in 4th gear at 6500rpm. That is a 1.69 4th gear ratio and a 2.77 diff, and the math looks like somewhere around 718 revs/mile. BTW that was inflated to 17 psi on the dragstrip. As far as changing tire size for the speedometer, in HP Tuners it's in Speedo>Calibration>Sensor Calibration. Sceenshot of a stock ZL1 tune file below, and the red arrow is pointing to the spot that calibrates the speedometer for the tire.

The VSS is for the speedometer, and my guess is that the Driven and Undriven tire circumferences are used by the Stabilitrack/ABS systems.

Name: where-is-speedo-tire.jpg
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Name: where-is-speedo-tire.jpg
Views: 151
Size: 42.3 KB

IneedAZ · 03-20-2021, 08:47 AM

That is the one i thought it was, but wasn't sure. My speedo page looks a little bit different though.

Thanks for the help!

arpad_m · 03-20-2021, 10:02 AM

Quote:

Originally Posted by IneedAZ

That is the one i thought it was, but wasn't sure. My speedo page looks a little bit different though.

Thanks for the help!

His tune file may be ECM only, while yours has TCM, too. Those three extra parameters you see come from the TCM.

wnta1ss · 03-21-2021, 08:18 AM

Quote:

Originally Posted by arpad_m

His tune file may be ECM only, while yours has TCM, too. Those three extra parameters you see come from the TCM.

Yes I think that you're correct, as that screenshot is an M6 file from the repository (notice the 3.73 final drive ratio).

03-19-2021, 06:43 AM	#1
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	Are you running 305/45R17? Question 4u Finally getting mine mounted this weekend and wanted to know what you changed in hp tuners for the speedometer. Could you post a screen shot or what setting you changed. Is it only the the setting that says Dist? What number? 726? Thanks __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

03-20-2021, 05:17 AM	#2
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	Anyone? Even if u don't have that size but have different than stock size can u confirm which settings to be changed __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

03-20-2021, 08:47 AM	#4
IneedAZ Drives: 2017 ZL1 A10 & 2021 BMW M340i x Dr Join Date: Mar 2009 Location: Tampa Posts: 5,110 View My Garage	That is the one i thought it was, but wasn't sure. My speedo page looks a little bit different though. Thanks for the help! Attached Images __________________ Sold 2012 2LT RS 12.3@112 old setup Sold 1967 Camaro Pro Street. Ran 10's mild BB on NOS. 2017 HyperBlue ZL1 A10 Born 3/17/17Delivered 4/08/17 2020 Build: Mag2650, BTR Stage2, NW103, BG, 14% lower, 90mm upper, ARH 2" Long system w/no cats, SW Legend mufflers. 807hp/762tq on 93 gas and 848hp/792tq on e47 Sold 2018 (Go Mango) Dodge Charger Daytona 392 Daily Driver Daily Driver 2021 BMW M340i Xdrive

03-20-2021, 06:53 AM	#3
wnta1ss Drives: 2017 Camaro 1SS Join Date: Aug 2016 Location: NH Posts: 1,693	I have used the 304/45-17 Mickey Thompson ET Street R and it's pretty tall. With my stock-tune SS, A8 trans, it was able to go 116mph in 4th gear at 6500rpm. That is a 1.69 4th gear ratio and a 2.77 diff, and the math looks like somewhere around 718 revs/mile. BTW that was inflated to 17 psi on the dragstrip. As far as changing tire size for the speedometer, in HP Tuners it's in Speedo>Calibration>Sensor Calibration. Sceenshot of a stock ZL1 tune file below, and the red arrow is pointing to the spot that calibrates the speedometer for the tire. The VSS is for the speedometer, and my guess is that the Driven and Undriven tire circumferences are used by the Stabilitrack/ABS systems.

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