Thread: SHO - Premium vs Regular fuel
02-23-2010, 03:50 PM #1
SHO - Premium vs Regular fuel
I realise this has most likely been covered, but I cant find any info on it.
My SHO cruiser 2008 manual states to use just regular unleaded fuel, which I have been doing without any problems.
My question is...... What would be the pro's/con's of using premium fuel, like the supercharged Doo's have to use? (so I've been told).
I'm after facts on the differences, if anyone of you pro guys have used it or are using it and if it effects the motor in any way. I'm only going off the manual as it says regular fuel, but need reassurance from you all before trying premium (if its worth it in a ski engine).
Many thanks for your time.
02-23-2010, 03:53 PM #2
i use Premium small price too pay for a better fuel , i have my motec tuned too Premium and i hear its better for the engine as well and runs cooler ive been told
02-23-2010, 06:13 PM #3
if the ski is stock the only benefit is to the seller of the fuel. the higher octane fuel has no benifit for the stock sho motor, if they claim it has less build up of carbon on the valves that would not be something to consider since these motors are constantly at high rpm's and not depositing much if any carbon on the valves. the only reason to run a higher octane fuel (on a four stroke motor) is to avoid pre-detonation in the combustion chamber and since the compression of a stock boosted sho motor does not require the added octane there is no benefit from it.
02-23-2010, 06:17 PM #4
02-23-2010, 06:25 PM #5
Thanx guys. Really appreciate your input here. Dont want to waste $$ or damage anything.
Yeah, its stock. Thats good enough for me anyways! I'm happy with it.
I'm curious if the premium would give slightly better consumption.
Oh well.... from your remarks, I'll probably stay with regular.
02-23-2010, 06:46 PM #6
02-23-2010, 06:59 PM #7
My question is, has anyone using a motec or vi-pec used 89 octane fuel ? i dont know how much of you all out there know but 87 produces more power than 93 octane fuel. Would like to know if any motec guys runing pump gas has tried the lower octane as of yet ? also any guys with stock ecu's
02-23-2010, 09:59 PM #8
02-23-2010, 10:09 PM #9
ok yeah same here, but used 89 sometimes, never did check performance gains on gps, i know some motorcyle guys use 89 instead of 91 and gain some horsepower from it and some decent performance gains, also some of the mercury offshore racing boats to make more power went with 89 instead of 91 to make more power because of restrictions in the class. just curious to see some guys try it out. see if they gain anything .
02-23-2010, 10:27 PM #10
I ran regular unleaded until I went to a C3 s/c wheel. Many changes since and I don't think I will ever see anything but 93 octane+
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