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post #1 of 13 (permalink) Old 04-15-2009, 08:19 PM Thread Starter
 
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How much octane?

The info on the engine says to use 91 octane or better. Is it OK to use racing fuel around 100? If so, does it really give a perfomance boost or not enough to notice?
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post #2 of 13 (permalink) Old 04-15-2009, 08:27 PM
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Re: How much octane?

Good question! Me and four_by_nut just found out that these motors are 11.5 to 1 compression which means to me 110 octane is perfect
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post #3 of 13 (permalink) Old 04-15-2009, 09:03 PM Thread Starter
 
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Re: How much octane?

Thanks for the info! I've never used high octane before cuz I've never had anything that could handle it. Does it make that big of a differance?
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post #4 of 13 (permalink) Old 04-15-2009, 09:17 PM
 
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Re: How much octane?

I have an email into our contacts at Weber asking this exact same question. I will let you know what they come back with. For me, this is only effective (going to a higher octane fuel) if the computer/motor has the ability to adjust the spark advance and fuel delivery.

More to come.........
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post #5 of 13 (permalink) Old 04-15-2009, 10:44 PM
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Re: How much octane?

Hey Jay,

I would be curious to hear what the have to say when they get back with you. My Revolt runs perfectly fine on 91 octane pump gas. I never have had any predetonation (pinging) issues running 91.

Is the guy at Weber you are talking to named Marcel?

Mike

Last edited by Red Rock Powersports; 04-15-2009 at 10:57 PM.
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post #6 of 13 (permalink) Old 04-19-2009, 09:20 AM
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Re: How much octane?

I run Premium pump gas. I've had my Revolt up to 9,250' and it runs great. I cant breath, but the Revolt seems to do fine.
Lower altitudes, you can use higher octane fuel >2,000'.



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post #7 of 13 (permalink) Old 04-20-2009, 12:29 PM
 
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Re: How much octane?

Got a response from the Weber guys the other day. They said:

"Unfortunately higher grade fuel would not hlep unless the engine is re-mapped to take advantage of the higher octane. I am not aware of anyone doing that kind of performance work to date.

The only easy change is a less restrictive exhaust system. You can gain about four horsepower by doing that. I think Redline is close to offering this. You may also want to use a larger two stage air intake filtration from Donaldson or Fleetguard. The original one is a just a bit restrictive.

An expensive option is to change to a turbo charged engine. Redline is just finalizing a factory coversion that is quite unique so it all fits. The base engine has pistons swapped (lower compression), high temp exhaust valves, and they reconfigure our turbo to be upside down so it will fit in with special brackets and swap to the turbo intake manifold and single TB and new single exhaust.

You might want to contact them to see if they are willing to convert used buggies, or do it through someone else like Wasteland Performance (normally does Ranger and Rzr conversions) or Watcon.com (Weber Aftermarket Dealer Distributor in Washington)."

I have followed up with a question about needing to re-tune the computer if you do an exhaust swap because there is no O2 sensor. I believe, like in a Rhino, if you swap out for a free flowing exhaust and intake, you need to update the computer to take advantage so you don't run lean and burn stuff up. No O2 sensor to adjust the fuel curves, etc. More to come........
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post #8 of 13 (permalink) Old 04-20-2009, 01:09 PM
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Re: How much octane?

Good follow up!! It sure seems a closed loop efi controller would be a great option and I think that Wasteland offers a different unit that they can tune. It sure would be nice to see an option for altering maps if a O2 logger like a Wide Band Commander were used to remap......
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post #9 of 13 (permalink) Old 04-20-2009, 05:08 PM
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Re: How much octane?

Four-by-nut, "if you swap out for a free flowing exhaust and intake, you need to update the computer to take advantage so you don't run lean and burn stuff up."

I've done both. You do gain a little HP, mostly top end RPM to redline. It hasn't had that bad lean smell, but then I'm at 4,300" and above. Remapping would be good.



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post #10 of 13 (permalink) Old 04-20-2009, 07:24 PM
 
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Re: How much octane?

Here is the followup response from the Weber guys.

"No, calibration was completed with less restrictive intake and exhaust and there are plenty of safety factors and features that should not allow any issues."

So my take is............put on an upgraded exhaust and free flowing intake and don't worry about computer upgrades.
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