Nhms fuel mistake

[j4eric]

I bought fuel at nhms during today's TTD...now my 99 r6 is backfiring
And twice the engine stalled during two separate sessions.....my r6 is not FI...if that makes any difference.....I think it is running lean due to the 98 octane.......can I just dilute the leftover gas in the tank with 87 octane? So it will run normal again?

[rice_rocket]

I thought you could only get backfiring if you have fuel of too little octane, not too high...

I would think that the only problem would be too much fuel burnt? You certainly could dilute gas down though......

I don't know a thing about carbs though, this is just experience from car tuning I'm babbling about.

[Boosh]

I wouldnt put that fuel in my bike its crap they tend to get water in it

[j4eric]

Maybe I sounded like it was all the time....I'd like to clarify myself....it only backfired twice under heavy acceleration....approx 13k rpm, and the other during downshift from 3rd to second on turn 11....then it stalled......it's running fine now at idle....but I know it will do it again on my next track day.....it's a dedicated track bike so I can't test it on the road.

[j4eric]

I wouldnt put that fuel in my bike its crap they tend to get water in it

This is the first time I did this.....So I guess I'll stick with 93 octane.....
I swear I did not know it was 9.90 per gallon.....I had sticker shock...I had 20.00 bucks in my hand...so I had to put it on my debit card.
The kid already filled the can, too late or me to back out..lol

[hondarider102]

Im not even sure i would run 93, its a 99 r6, i would doubt the compression is super high, you may be better running 87 or 89

[Eric Baker]

Yeah you're better off running 87 all the time. You want to run the lowest octane you can without getting detonation. You get the best power that way. I run nothing but 87 in my '02 R6 with slightly higher compression with no issues.

As far as the backfiring, the high octane isn't gonna cause that. If the gas has some kind of contaminants in it, i.e. water, it could though.

[Marc]

It sounds like you got water in there to me too. I would siphon your tank out and look at it. The owner's manual for your bike probably says 87 and that's what you should put in it, even at a track day.

[TTD]

I am no expert on this stuff, but I though too high an octane is just as bad as too low?

I didn't realize it was 98 octane either... or that expensive!

Guess i will have to keep reminding people to bring their own fuel.

[j4eric]

I am no expert on this stuff, but I though too high an octane is just as bad as too low?

I didn't realize it was 98 octane either... or that expensive!

Guess i will have to keep reminding people to bring their own fuel.

i didnt even look Tony, i just told the kid to fill it up.....$34.00 later, i looked
and i thought the pump was reading in error....$9.90 a gal...lol

[DucDave]

I would be really surprised to hear that running a tank full of 93, 87 or anything inbetween would make a noticable difference in a stock street bike. In all my riding on all my bikes I've had to mix various grades and have never noticed a difference.

If it's really the fuel, I'd agree that it could be water.

It could also be a leak in the exhaust somewhere. I've had that happen when a header nut loosened up and also once when the access port came out on the mid pipe...

[hondarider102]

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I would be really surprised to hear that running a tank full of 93, 87 or anything inbetween would make a noticable difference in a stock street bike. In all my riding on all my bikes I've had to mix various grades and have never noticed a difference.

If it's really the fuel, I'd agree that it could be water.

It could also be a leak in the exhaust somewhere. I've had that happen when a header nut loosened up and also once when the access port came out on the mid pipe...

You won't really notice it as far as throttle response or the way the motor sounds but using high octane causes excessive carbon build up

[TTD]

I would be really surprised to hear that running a tank full of 93, 87 or anything inbetween would make a noticable difference in a stock street bike.

Yeah, but this stuff is 98 octane... so I believe it has a higher ignition point?

My current bike is the first bike I've owned that prefers 93 (as opposed to 87). I get slight "cut outs" going down the front straight with the lower octane. (unless that was a bad batch of gas?)

[j4eric]

i would like to think that water is not the cause...i have confidence in the fuel quality
at NHMS....why wouldnt I, its a NASCAR track.

i would like to think that it was the high octane that caused this....i will dilute with 87 octane and go from there.

thanks guys.

[Lxpony]

$9.90 a gal...lol

What the FUCK!!! Bastards! The Shell station just south of the track has 91 for like $3.80 a gallon

[FireboltEric_MA]

i would like to think that water is not the cause...i have confidence in the fuel quality
at NHMS....why wouldnt I, its a NASCAR track.

Have you seen This thread, He has a Gas Problem?

[TTD]

What the FUCK!!! Bastards! The Shell station just south of the track has 91 for like $3.80 a gallon

yes...but this is 98 octane

[KB]

Really?

Seriously?

KB

[Danz19899]

fill it with 87 call it a day. should dilute it enough.

your bike probably couldn't burn the 98 octane very well so it might have fired up in your exhaust hence the back fires

[CBR929RE]

if you're really worried about it drain it and mix it in your car with a full tank. then fill the bike up.