Author Topic: 2017 M8 speed limiter  (Read 2692 times)

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Offline rigidthumper

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Re: 2017 M8 speed limiter
« Reply #25 on: November 05, 2017, 08:56:28 AM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Offline PoorUB

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Re: 2017 M8 speed limiter
« Reply #26 on: November 05, 2017, 09:49:02 AM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Don't tell me, are you are trying to say that HD speedometers are not accurate? :hyst:

My bet is at 120 MPH that speedo is off more than 4 MPH, my guess is 6 MPH or more.
I am an adult?? When did that happen, and how do I make it stop?!

Offline happyman

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Re: 2017 M8 speed limiter
« Reply #27 on: November 05, 2017, 05:12:34 PM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Don't tell me, are you are trying to say that HD speedometers are not accurate? :hyst:

My bet is at 120 MPH that speedo is off more than 4 MPH, my guess is 6 MPH or more.
Years
Quote from: PoorUB
link=topic=101112.msg1187244#msg1187244 date=1508968587
No sir! I never have ridden at three times the speed limit on a public road! (At least, not on a Harley!) :bike:
Years ago did a data run on a ultra limited . Ran it in 5th gear to wide open. Looked at the run and it showed 149mph if I recall correctly. At just a couple 10ths under 6700 rpm
.that was as fast as I have had a Harley in many years.

Offline FLHRI_2004

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Re: 2017 M8 speed limiter
« Reply #28 on: November 05, 2017, 05:20:07 PM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Don't tell me, are you are trying to say that HD speedometers are not accurate? :hyst:

My bet is at 120 MPH that speedo is off more than 4 MPH, my guess is 6 MPH or more.

You win the bet.  My 2014 is off.  When I ran Pocono raceway this year, I got to 120 mph, just (according to GPS).  The speedo was way over that.  I'm guessing 5 mph generous at that speed.  I had to slow for turn one, so I couldn't top out the speed.  At 65 (GPS), it reads almost 70.
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Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #29 on: November 06, 2017, 12:45:04 AM »
125 is about 5800 in 4th  5th and 6th do the same thing at 125  tiny digital that doesnít keep up when wot

Offline biglew55

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Re: 2017 M8 speed limiter
« Reply #30 on: November 06, 2017, 05:07:57 AM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Don't tell me, are you are trying to say that HD speedometers are not accurate? :hyst:

My bet is at 120 MPH that speedo is off more than 4 MPH, my guess is 6 MPH or more.

You win the bet.  My 2014 is off.  When I ran Pocono raceway this year, I got to 120 mph, just (according to GPS).  The speedo was way over that.  I'm guessing 5 mph generous at that speed.  I had to slow for turn one, so I couldn't top out the speed.  At 65 (GPS), it reads almost 70.
In my experience, pre-2015 Harleys are 6% off (65 GPS would read 68 speedo, 120 would read 127).  Somewhere around 2015, they decided to sell them with accurate speedometers.  All this really meant was updating the calibration number in the ecm, and anyone with a TTS or PowerVision tuner could do that too.
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Offline happyman

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Re: 2017 M8 speed limiter
« Reply #31 on: November 06, 2017, 07:43:22 AM »
Sounds like maybe hitting the rev limiter (or an optimistic speedo)- with 2.79 overall gearing, 4th gear @ 6200 RPM would be ~121MPH.

Don't tell me, are you are trying to say that HD speedometers are not accurate? :hyst:
ran a couple  GPS with my speedo  is bout 2.5 off on both.  one on my phone is the same also .   bike is 17 CVO SG.  don't dare hook a  TTS to a new bike with all the issues.   

My bet is at 120 MPH that speedo is off more than 4 MPH, my guess is 6 MPH or more.

You win the bet.  My 2014 is off.  When I ran Pocono raceway this year, I got to 120 mph, just (according to GPS).  The speedo was way over that.  I'm guessing 5 mph generous at that speed.  I had to slow for turn one, so I couldn't top out the speed.  At 65 (GPS), it reads almost 70.
In my experience, pre-2015 Harleys are 6% off (65 GPS would read 68 speedo, 120 would read 127).  Somewhere around 2015, they decided to sell them with accurate speedometers.  All this really meant was updating the calibration number in the ecm, and anyone with a TTS or PowerVision tuner could do that too.

Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #32 on: November 07, 2017, 05:18:18 AM »
1st thing this is a 130mph 2018 Speedo not pre 2015 120 speedo. Come to Va Beach and you can ride it. Then you can decide. M8 can not be compared to any Harley before..New World.

Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #33 on: November 07, 2017, 05:24:07 AM »
Mr Ridgid, I have been riding since 1964. Raced NHRA Pro Stock 1989-1991 PSB 291. 7 second 1/4 miles  17 year racing career I know more than you can imagine about shift points and relimiters ..You have zero clue about me and what I know or can accomplish 

Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #34 on: November 07, 2017, 06:28:21 AM »
Mr Ridgid, hey genius. M8 has 4th gear overall ratio of 3.88. Not your 2.79 you came up with. RIF reading is fundamental! Read up on what the M8 is and has inside the cases. Makes you look better.  Yep you found someone who has knowledge

Offline rigidthumper

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Re: 2017 M8 speed limiter
« Reply #35 on: November 07, 2017, 06:30:35 AM »
I'm impressed with your credentials, and your unwarranted attacks.
You have a nice day.

Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #36 on: November 07, 2017, 06:38:04 AM »
Mr Ridgid you attacked 1st.  M8 and TC are not geared the same  but! The overall ratios are the same  there is about 300 rpms difference in 6th  must be in primary gears  now Iím guessing

Offline Larry757

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Re: 2017 M8 speed limiter
« Reply #37 on: November 07, 2017, 06:40:10 AM »
Maybe tire dia. 200-17. Vs 240-18. Difference in gearing

Offline rigidthumper

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Re: 2017 M8 speed limiter
« Reply #38 on: November 07, 2017, 06:53:26 AM »
I never attacked you.
It's obvious you know infinitely more than I do about HDs. Softail gearing is identical 2017 TC & 2018 M8.
Again, have a nice day.
« Last Edit: November 07, 2017, 07:01:40 AM by rigidthumper »

Offline rigidthumper

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Re: 2017 M8 speed limiter
« Reply #39 on: November 07, 2017, 07:00:08 AM »

deleted- double post

Offline PoorUB

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Re: 2017 M8 speed limiter
« Reply #40 on: November 07, 2017, 07:28:07 AM »
Years ago did a data run on a ultra limited . Ran it in 5th gear to wide open. Looked at the run and it showed 149mph if I recall correctly. At just a couple 10ths under 6700 rpm
.that was as fast as I have had a Harley in many years.

149 MPH on a bagger? What engine? Sure wasn't a near stock 103"!
I am an adult?? When did that happen, and how do I make it stop?!

Offline happyman

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Re: 2017 M8 speed limiter
« Reply #41 on: November 07, 2017, 07:32:57 AM »
Years ago did a data run on a ultra limited . Ran it in 5th gear to wide open. Looked at the run and it showed 149mph if I recall correctly. At just a couple 10ths under 6700 rpm
.that was as fast as I have had a Harley in many years.

149 MPH on a bagger? What engine? Sure wasn't a near stock 103"!
not  stock at all. was a 107  T Man build I did .

Offline Hossamania

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Re: 2017 M8 speed limiter
« Reply #42 on: November 07, 2017, 10:32:04 AM »
Mr Ridgid you attacked 1st.  M8 and TC are not geared the same  but! The overall ratios are the same  there is about 300 rpms difference in 6th  must be in primary gears  now Iím guessing

I didn't see it as an attack. He did not know your history, and was honestly wondering and asking a legitimate question.
Most people on this site are very respectful, when statements or questions are asked, they are not done so in a disrespectful or attacking manner, or name calling. That's left for the other sites, maybe that's what you are used to seeing.
This site is not like that, and it is not tolerated.
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Online 1FSTRK

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Re: 2017 M8 speed limiter
« Reply #43 on: November 07, 2017, 11:01:44 AM »
M8 and TC are not geared the same  but! The overall ratios are the same  there is about 300 rpms difference in 6th  must be in primary gears  now Iím guessing

Maybe tire dia. 200-17. Vs 240-18. Difference in gearing

First i would like to wecome you to HTT.
This is the best Tec site for Harleys I have found and we can always use more people with knowledge and personal experiance.

Can you explain to me how these two models the overall gearing would be effected by either the primary ratio or rear tire in high gear only?
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