i havent seen if n e one has used race fuel at all in the us lancer and i did a half *** search cause im half awake. anyways, i was told that i would be safe running 100 oct. leaded with the cat removed and the test pipe in. is there any truth to this theroy, if so i plan on going to the track and trying it.

thanks

Cory

 

Without any kind of fuel management, that extra octane will just exit unburnt and unused. There's only so much that the stock ECU knows what to do with in regards to air/fuel, which is why there's good gains to be had with air/fuel controllers, ECU reflashes, and chips.

As for what that added octane will allow, best to leave that to the experts, which I am most definitely not.

 

i am tunning with an afc controler with an a/f gauge.....

 

ijust wanna know that i will be safe to use race fuel, or if any one has any experence with it in the lancer with correct fuel tunning moddifications

 

on a NA car it isnt really worth the 4 bux a gallon or so. But with your cat out it is safe enough. You computer doesnt know what to do with that high of octane but with proper tuning you could run it.

 

is it even safe to run leaded gasoline?

 

Odds are you'll never run the compression/boost/timing to warrant racing gas on a Lancer and still be streetable. All that octane would just make it harder for your car to burn the gas.

 

dont forget about your second cat in the header
and also dont forget abotu your o2 sensors leaded gas will start to f*ck those things up

 

liquidlancer hit the nail on the head... stay away from the leaded gas! Even if you have a header without the pre-cat, the lead can **** up other parts of the engine. If you still have stock exhaust manifold, the pre-cat inside of it will clog up from the lead.

 

SEARCH LOL and dont hijack peoples threads 2nd as far as tuning i hope your using a wideband air fuel gauge not an autometer blinking lite on for tuning

 

if your na, just stick with the 91 or 92 octane. you really dont need anything higher, unless your running high compression or a really good spark system


Link

 

with this huge gas crisis here in arizona, I was only able to get 87, and that was after an hour wait. I have a tb, headers, intake, test pipe, axle back, and other mods not directly affected by the octane I put in, and I tell you my car runs like **** on 87. Noticeably slower, not as alive and smooth as 91!

 

The worst part about running leaded fuel on a fuel injected car is the O2 sensors. As someone said before, they tend to "clog up" or collect a build up of material on the sensor which intern, if I remember correctly, creates a lean condition and the ecu compensates by adding more fuel. Why not use 100 unleaded octane or even a mixture of 91-93 and 100? Just remember: high octane fuel needs to be burned at a hotter rate. Then there is always the colder plugs, timing, etc. I use to run 118 octane leaded race fuel for my 14:1 Digital Fuel Injected NOS BBC Z-28. Just my 2c.

 

The octane's not going to help and the lead is bad for cats and o2's but it is actually a lubricant for your valves. I know theres unleaded high octane gas out there like VP and Sunoco racing fuels, But you can only get them by the drum.($500) So unless you substancially retard your timing or raise your compresion its really not worth buying.

 

Read the manual. I think it says only use regular fuel only which is 83 octane.