Author Topic: Mountain Runner Flash -- Dumb Question; Octane  (Read 401 times)

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Offline dcstrng

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Mountain Runner Flash -- Dumb Question; Octane
« on: May 27, 2020, 10:07:39 am »
I have the Shoodaben Mountain Runner ECU -- recently 90-octane non-ethanol  gas has become reasonably available in my area; can I use this all the time, or is the 89-octane ONLY "for the times you are on a long trip and can't get premium octane fuel..."

I've been running 93 octane 100% of the time and am wonderfully pleased with this ECU, but just noticed the new fuel availability -- riding style (if you can call it that...) is to rely much more on the low-mid-range torque than top end power -- my bike sees much more time in the 3-5K RPM range, than anywhere above 8K RPM

Thanks...
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Offline mgoodrich

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #1 on: May 27, 2020, 10:53:48 am »
This is off of his website,

"10) I tune with 10% ethanol pump gas. Mountain Runner is built with, and can safely run 89 octane. Mountain Runner PREMIUM and THE HAMMER must use 91+ octane, unless throttle is limited to less than 50%."

So, I take that you can run with 89 under all conditions with Mountain Runner.

I have several stations around me that only sell 89 locally, and 91 is the highest premium I can get.  The station that sells 91 shares the hose with the 87 octane, so I figure when I fill up there I get about .8 gallon of 87 from what is in the hose (that is what I have read anyway) before the 91 comes through, so that is something to be aware of as well.

I run the mountain runner flash.  It is a nice improvement in the throttle response.

Online Shizzle

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #2 on: May 27, 2020, 02:23:31 pm »
Pretty sure the owners manual calls for 90+ so that's what I would use. You didn't change the compression ratio with the tune so go by the Owners manual would be my recommendation. I run 91  non ethanol from BP with Ivan's flash and a V&H Slip On and the bike is amazing.

Offline lather

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #3 on: May 27, 2020, 04:34:41 pm »
I have run 89 only with Mouintain Runner for two years, no problems.

Offline Dirtwiz

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #4 on: May 27, 2020, 10:06:18 pm »
I just messaged with Steve yesterday since I am having my flash upgraded from the EVO to Mountain Runner 89. I only can depend on getting 91 octane consistantly in my area and that will work with the Mountain Runner 89. The Mountain Runner Premium requires 92 octane and above unless like stated above, it is held to below 50% throttle. I went with the MR 89 since I didn't want to chance it with the wrong fuel and have problems. If I had better gas in my area I for sure would have gone to the MR Premium flash. My ECU is in the mail to him now so hoping I like it better than my EVO which is great.
In theory, practice and theory are the same. In practice, they aren't. Without data you are just another guy with an opinion.

Online MAN OF BLUES

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #5 on: May 27, 2020, 11:09:53 pm »
ez pz.. cheap, and an alternative.. I can get 92+ everywhere here in Ohio, and P.a., but still carry a bottle in the trunk.. for just in cse.. along with IsoHeet..
https://www.thedrive.com/reviews/28072/best-octane-boosters

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Offline connie_rider

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #6 on: May 27, 2020, 11:31:33 pm »
MOB beat me to it, but I agree with him. {please don't tell anyone I sed that  :truce:}

If your worried about octane values, keep a little octane booster with you.
   Problem solved.

Dirtwiz, with that info, ya might want to consider the Mountain Runner Premium? {Hint hint}

Ride safe, Ted
 
« Last Edit: May 28, 2020, 11:45:18 pm by connie_rider »
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Offline WFL

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #7 on: May 28, 2020, 02:17:49 am »
Everything you have wanted to know about octane, octane boosters, what is "octane" and how it is measured.  Found this web site when i was board and messing around in Perth AU last Christmas. The web truly has a lot of amazing info on it. :great: :great:
http://www.fuelexpert.co.za/Octane-Booster-Shootout.php#
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Offline Road Runner

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Re: Mountain Runner Flash -- Dumb Question; Octane
« Reply #8 on: May 28, 2020, 08:02:00 pm »
Thx MoB and WFL for sharing the octane booster info.;  :great:
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