Bryans951

WHat harm will this do to my engine? My friend was putting gas in my car and udes 87 instead of 93. It lost all power and won't go. I told him to get some octane booster to get the octane up close to 93. Aything that I should do when I mget home tonight?

Bryan
86 951

ERAU-944

the only possible damage i could be thinking of would be detonation... the explosive combustion of the fuel air mixture caused by using a lower octane fuel than you should... you shouldnt notice a giant power loss. do get some octane booster and see if that helps. if your car should have 91RON then 87 should be fine from us pumps... personally i dont use anything but 93, cleaner burning, and no chance of detonation... my car runs smooth and very nice at all times. i'd rather pay more and be assured that my engine isnt going to blow up, because detonation is harmful. so go for that octane booster, but it sounds like you have some other problem like water in the gas if you lose all power, the car should run fine on 87.

happy driving,
-Mike

Tabor

The KLR should dial back boost and timing to prevent any damage (if it detects knocking). This is why it feels weak.

IceShark

Tabor is right. Also, if you are aftermarket chipped you can be sure you are getting dialed back from knocking.

You are going to have to add a ton of octane booster to get that tank back up to the low 90s. Say you have 18 gallons of 87 in there. You would need to add a bit over 4 gallons of toulene (114 octane) to get to 92, and your tank isn't that big. You can get the toulene at the hardware store or paint shop. May as well get a 5 gallon can for the price break, or just forget the whole thing and burn up that tank and live with it.

Danno

And forget about those little bottles of 104+ and other crap you find at the auto-parts places. First, they use organo-metallics which are highly carcinogenic. Second, they only raise your octane by 2-3 'points', which is really 87 -> 87.2 octane.

So 4 gallons of toluene in an 18 gallon tank would give you: [(4*114)+(14*87)]/18= 93 octane. That would cost $40 for a tank, more expensive than going with the 93 octane at the pump to begin with.

However it is cheaper than race gas at $7.50/gal if you blend it 40/60 (7 toluene/11 92-octane) for a 101-octane tank.

996FLT6

I would like to fuel up with 100 octane fuel but where I live the only station is at Sears Point(45 miles away)so by the time I fuel up I already used 1/4 tank. In CA, octane is 91 so from what I read hear- where do you get touluene and whats the mixture proportion(my fuel tank is 15 gallons aprox.)? And toulene is what raises the octane rating(main ingredient?)?

Danno

Yes, toluene is one of the principle octane-boosting aromatics in gasoline (pure hydrocarbons, no organo-metallic additives like lead or maganese). Please review the Fuel FAQ section from my <a href="http://members.rennlist.com/951_racerx" target="_blank">951 RacerX website</a> to see that it is a major component of gasoline (specifically the F1-RocketFuel FAQ).

As you can see, aromatics make up about 29% of gasoline in the US. However, this is about 10% lower than the formulations in Europe. By adding 10% more toluene to a 91-octane pump-gas mix, you'll get 100-octane.

So you would then make a 40/60 mixture of toluene/91-octane pump gas. In a 15-gallon tank, that's about 6 gallons toluene to 9 gallons 91-octane pump gas.

It'd be interesting to see some dyno comparisons with the difference between the 91/100 octane maps from the Unichip device.

EDIT: PS- Toluene can be found at paint-supply stores (Sherwin Williams, etc.) as 'lacquer thinner'.

IceShark

If you buy toulene in huge bulk, like a group purchase, you can drive the price down quite a bit. I don't know where you would store that bomb, though. I get nervous enough with 55 gallon drums sitting by the garage.

Tremelune

Just make sure you use 93 from now on...it'll smooth itself out.

Peckster

Your firemen would freak. Is this the same stuff as acetone?

IceShark

No, toulene is not the same as acetone but close enough that firemen would get sort of excited with 55 gallon drums around.

996FLT6

Thanks for your responses. Now would you like top it off with touleune like for exaample if I have 9 gallons of 91 remaining I would top off with 6 gallons of touluene? And this is for unleaded right? Thanks. Mike

Huntley Racing

Another Option is that Huntley Racing now drop ships directly to YOUR location 55 gal drums of 101 unleaded, 111 leaded, 120 leaded at only $4.25 a gal!! If you are a POC member it is even cheaper! We rent and sell pumps too if you need one. There is a $25 deposit. We sell fractions of a drum at Huntley Racing too.

<img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

deni durrell

996FLT6:

you can also get high octane fuel somewhere in Manteca. It's still going to be a drive from the City though. A truck and a 55 gallon drum would still be worth it.

There was an intresting thread on the some 911 turbo forum (rennlist). interesting discussion about fuel pumps and filters, and having to change them often because of the crap in our petrol, etc..

We can only get __maximum__ 91 octane over the counter here in California, people! so no braggin about what octane you can get from you corner &lt;chemical&gt; dealer! we are hating it enough as it is..

Danno

As a little note of caution: DO NOT BUY 91-OCT GASOLINE FROM THE ULTRAMAR STATION 1-EXIT NORTH OF LAGUNA SECA ON 101 !!!

I made that mistake last January and the car was simply unruly on the track. It buckled and pissed and moaned like a wild bronco ride! I ended up dumping as much race gas @ $7.50/gal as possible into the tank to try and dilute that stuff. Just say no to Ultramar!