Premium gas?
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Road Master
Joined: Feb 2015
Posts: 1,040
Likes: 203
From: Susanville CA
Premium gas?
I have owned my 2001 road glide for a little over a year now. I have used regular unleaded since day 1. Some of the guys I ride with insist I am going to screw up my motor. Twin Cam 88. Can some one please explain to me why I need to use higher octane?
Thanks
Thanks
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
I live/ride in south Texas and do run 93 June through August when ambient temps start to approach 100*. I suspect I could run those months on 89 octane, maybe even 87 but I don't want to take a chance of introducing detonation.
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Seasoned HDF Member
Joined: Oct 2009
Posts: 7,438
Likes: 4,895
From: North Dakota
40 - 50 cents a gallon extra here. But it's the only pure gas available.
Does HD ecm have that system that retards your timing if it detects knock?
Does HD ecm have that system that retards your timing if it detects knock?
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Ultimate HDF Member
Joined: Jan 2008
Posts: 6,532
Likes: 132
From: SoCal
I run premium. No way to know if you need premium unless you look at the timing when it's being ridden to see if the ecm is pulling timing out due to detonation unless it's so bad that you actually hear it because the ecm can't pull enough out. I hope that run on sentence made sense,LOL
Ultimate HDF Member
Joined: Jul 2014
Posts: 8,251
Likes: 3,989
From: Windwardside, Saba N.A.
As long as no pre-detonation in combustion chamber, engine will make fractionally more torque when run on lower octane fuel. Has to do with lower octane fuel having lower vapor pressure. There are LOTS of vitriolic threads about this topic.