I usually use the cheap stuff when it come to gas and my car has always idled at 1500rpm and sometimes 2000rpm warming up!!!! I'm using the racingbeat setup. But on friday night I thought I might as well try the medium (86 oct.) this time and as soon as the gas got to the carb it started idling really low. Like 800 rpm low. Then as soon as I would let off the gas it sounded like it wanted to stall and would go down to 400rpm but would then pick up the idle back to 800rpm. I know I've heard people say that 800rpm or so is normal but not for my car!!! lol Why and how is this?!?!?!?! Is it possible that the 7 doesn't like higher octane gas??? Or maybe I got a bad batch of gas????? Or what else is going on????? It doesn't seem to suffer any horse power when your on it. What do ya guys think????? Thanks.

 

if anything i think higher octane gas would make your car idle higher... 1500 RPMs is way to high unless you have a giant port or something..

 

No port, just stock core. We tried to make it idle lower but the flippin thing wont!!!!! It makes me so mad!!!!!!!!! lol Thats exactly what I thought, it should idle higher with higher octane...............

 

Rotaries love low octane, the lower the better. I believe the racers were running something like 83 octane back in the day. The higher the octane rating, the slower the burn. Rotaries need a fast burn due to the short burn cycle.

 

Hey great!!! Thanks for that info kentetsu!!! By the way I saw some of your vids and they're awesome!!!!

 

86 octane is your medium??? 86 is like water here in OH. it starts at the low low 86 (if you can find it) then goes to 87, then to 89, 92, 93, 94......

 

We only have three to choose from at the local sheetz. I supppose your also paying more than $3.65 a gallon too tho!!!!!

 

is there a way to lower the octane in gas?

 

I suppose you could try using cetane boosters? Dunno if it would work, and I certainly doubt it'd be worthwhile.

 

2 stroke oil lowers the octane slightly.

 

i paid $3.73 for 87 today in the GSL. it was $3.83 for 89, $3.93 for 93, and $3.99 for 94

 

ha you guys got it easy here were paying 4.25 for 91

 

That sucks!!!

 

we are paying about 4.50 for 87

 

I just reaized the medium stuff I got was actually 93, not 87. 87 is the lowest we can get....... I was mistaken.

 

That makes a bit more sense.

 

I thought it would, thanks again for all the great info kentetsu!! You saved me a lot of worrying! lol