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M8 114 Stage 4 rev limit

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  #1  
Old 07-16-2018, 03:49 PM
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Default M8 114 Stage 4 rev limit

Is there a particular reason the rev limit is cutting off around 6400 rpm? Its most annoying in first and second gear. Engine has a ton of power still available and shows no sign of faltering. What would be the harm in bumping it up to say 6700. Is there a technical reason for such a shallow cut point?
 
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Old 07-16-2018, 11:16 PM
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Mine stopped making power at 6400. HP rose until 6400 then fell off, torque dropped before that. On my bike any more RPM would be a total waste.
 
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Old 07-17-2018, 12:31 AM
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Originally Posted by Patrick Eubanks
...Engine has a ton of power still available...
How do you know this? If the rev limiter kicks in, then the dyno chart stops there.

How many more hp do you think you'll get in that next 300 rpm? Even more importantly, how many tenths do you think you'll shave off before the next red light?

6,400 is plenty, unless it's a pure, purpose-built race bike.
 
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Old 07-17-2018, 01:04 AM
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Default Engine Grenade

Originally Posted by Patrick Eubanks
Is there a particular reason the rev limit is cutting off around 6400 rpm? Its most annoying in first and second gear. Engine has a ton of power still available and shows no sign of faltering. What would be the harm in bumping it up to say 6700. Is there a technical reason for such a shallow cut point?
Your Stage 4 Tune already lifted the stock Rev limit by 900 rpm from 5500.Really don't understand what you want to achieve up higher.Even if you shift up one gear from 6400 you will still be above 5400 revs which is the max out speed of 120 mph in 5th.
Generally Stage 111 and 1V M8s are not capable of more than 4800 revs on a flat road In 6th!
Of course you will meet many guys who can exceed these figures,sitting on a stool at the bar!
 

Last edited by Peter Quinn; 07-17-2018 at 01:06 AM.
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Old 07-17-2018, 01:28 AM
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Originally Posted by Patrick Eubanks
Is there a particular reason the rev limit is cutting off around 6400 rpm?

Yes! So it don't go boom.
 
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Old 07-17-2018, 09:18 AM
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**** my tts is set at 6100
 
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Old 07-17-2018, 12:22 PM
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Default 6400 Redline

Usually so you won't blow it up...Valve springs will be among the first things to give up.
 
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  #8  
Old 07-17-2018, 01:18 PM
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6400 RPM... Da ***?
Go back to riding Jap bikes, you're obviously a mental midget.
 
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Old 07-17-2018, 01:51 PM
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For the record, the factory HD Map for a CVO 114 is set to 6000 rpms. The HD Factory map for a Stage IV 117 is set to 6800 rpms.
 

Last edited by Heatwave; 07-17-2018 at 01:52 PM.
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Old 07-17-2018, 02:45 PM
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Originally Posted by heatwave
for the record, the factory hd map for a cvo 114 is set to 6000 rpms. The hd factory map for a stage iv 117 is set to 6800 rpms.
thats high
 


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