Racing Fuel And Fuel Injectors

[04trent04]

OK i have a 1991 Izusu stylus thats 100% stock (beceause of track rules) that i race at a local dirt track and i have had a couple of people tell me that running racing fuel (112 octane) in it will ruin the injectors. i have had problems with it running rough at idle and full throttle and getting hot the last few weeks and wondered if it was beceause of the injectors are going bad. Any help or suggestions would be appericated.
Driver of car 04,
Trent

[xXxRocker5150]

I think it's running rough at idle could be due to a number of things, but more than likely when was the last time you changed the timing belt/other belts, and all the pulleys/pumps... if the injectors are getting bad you could try some injector cleaner??? also when's the last time you changed your plugs and wires???? I'm not too good with injector stuff, but I don't think race fuel'll screw em' up...

[CBFryman]

define racing fule? 112 octane tells us nothing. Alcohol Mix? Leaded gasoline? a Nitro Alcohol mix? Ethanol can be hazardous to to fule systems if they have certian type of fittings and the injectors are mad of certian types of metals/platics. however if the car is certified to run on E85 there shouldnt be a problem.
Nitro Alcohol mixes are quite corosive to a lot of materials, generally Brass and Aluminum fittings are all that can be used as far as my knowledge goes.
Leaded fules wreak more havoc on your EGR system and Catalytic converters...
if your engine is stock running any of the above shows no benefit except for a nitro alcohol mix.

[04trent04]

we put a new timing belt on it when we got itand the plug/ wires are new at mid season and we dump a bottle of injector cleaner in it every other week
There is no catalytic converter on it unless you ask the track officials its not E85 certified and its an alcohol nitro mix fuel.

[CBFryman]

probably slowly eathing through your fule lines and sending little hunks of fule line into your fule injectors and cloging them if it is the injectors causing the problem.
Suggestion to get more performance, though you may have already done it, because it is 112 octane yo ucan advance the spark timing if it is alowable throgh your particular set up.

[04trent04]

the timing is advanced as far as the brackets will allow and its ran fine like that before

[nissanfanatic]

Are these side feed or top feed injectors?

I don't see typical racing fuel messing up your injectors. Most of the higher HP 240sx guys I know run it.

Now that injector cleaner BS is prolly what is messing you up. I'd quit using that stuff. As quoted from RC engineering:

"Chemicals that are strong enough to even clean your injectors would probably eat your entire fuel system,"

If anything, keep a set of backup injectors, send the set that is out to be cleaned, then at some point, pull the injectors from your car, put the cleaned ones in, and send the ones you just pulled to be cleaned.

As for fuel selection, you should run whatever the car runs best on. If it isn't detonating on what you are running now, then there is no point to running higher octane fuel.

[JekylandHyde]

The most commonly used race fuels, 110 and 112 leaded, should not affect your injectors in anyway. The lead will/can harm your oxygen sensors and clog your cats.

The bigger question is why would use such a high octane in a "100% stock" car?

Your best performance will come from using the lowest octane fuel you can use without experiencing detonation/knock. If you are not experiencing knock on 87, stay there ... then go to 89, 91 ... 93 ... 94 ... it takes a lot of power and/or boost pressure to justify 112 octane.

[nissanfanatic]

lol just reread that, the rough idle is becuse your plugs are prolly fouling to hell with that racing fuel.

You should prolly just run premium and call it a day. 87 might be a lil risky being under full throttle a lot due to cylinder temps. Could cause detonation after it gets hot enough. Seen that before on a couple other forums.

[Igovert500]

Originally Posted by JekylandHyde

The most commonly used race fuels, 110 and 112 leaded, should not affect your injectors in anyway. The lead will/can harm your oxygen sensors and clog your cats.

The bigger question is why would use such a high octane in a "100% stock" car?

Your best performance will come from using the lowest octane fuel you can use without experiencing detonation/knock. If you are not experiencing knock on 87, stay there ... then go to 89, 91 ... 93 ... 94 ... it takes a lot of power and/or boost pressure to justify 112 octane.

[DCarr511]

Originally Posted by JekylandHyde

The most commonly used race fuels, 110 and 112 leaded, should not affect your injectors in anyway. The lead will/can harm your oxygen sensors and clog your cats.

The bigger question is why would use such a high octane in a "100% stock" car?

Your best performance will come from using the lowest octane fuel you can use without experiencing detonation/knock. If you are not experiencing knock on 87, stay there ... then go to 89, 91 ... 93 ... 94 ... it takes a lot of power and/or boost pressure to justify 112 octane.

Bingo ....

Also ... please define your " Alcohol Nitro mix ' fuel. Are you saying that your using Methanol and Nitromethane ?

[CBFryman]

that is what I was refering to, a small percentile of nitromethane in the mixture, unlike what is used in top fule.