100 octane. Yes or no

[Spoilt22]

I have recently upgraded to LMS 93 tune and CAI, was wondering if I can run 100. Also does anyone know where to find 100 in the Philadelphia or surrounding area?

 

[MNRubyRed2013]

I'm sure others will chime in, but I believe unless you have a tune for 100, you are just throwing away your money.

 

[SHOdded]

Like John says, get the tune for the 100. Worth the effort to swap out tunes. Best bet is to find either Sunoco 100 or VP Racing Fuels. If you can find e98, possibly blend with 93 to get 100 octane, but then would not be LME supported.

 

[MR-R1CHTER]

Check this out --->
http://www.racegas.com/fuelfinder
Im from the allentown area and there is plenty of shops that sell the 260 GT fuel with 100 octane and even the 260 GT Plus with 104. I was wondering myself if my SHO will agree with that high of an octane though...

 

[EcoPowerParts]

Actually if LMS left the ability for the ECU to add timing then yes 100 octane should add power as the ECU will try and add timing until it sees knock.
From the conversations I've had with tuners and the logs I've seen I believe that I am correct in my understanding of this function. That's why you'll see both + and - values in the knock pid when logging via SCT I've been told.

 

[BamSHO]

I've email LME about running race fuel. They said ok, as long as it was unleaded race fuel and no E85. I'm running the 4X tune.

 

[RealityCheck]

I've email LME about running race fuel. They said ok, as long as it was unleaded race fuel and no E85. I'm running the 4X tune.

Running higher octane fuel than your tune can take advantage of will actually cause you to lose power. If LMS says its timing/fueling maps can take advantage 100 octane fuel, you're good. Otherwise, you're spending more money to make your car slower.

Did they say "OK" as in it won't hurt anything or "OK" as in you'll get more power? They're 2 very different questions. Considering they have different tunes for slight changes in octane (91 vs 93, for example), I'd be surprised if a tune can account for a 7+ point jump in octane.

 

[sho/saleen]

I use Sunoco SS100 in my 1988 Saleen because of the Mods. Go to Sunoco racing gas web page and select SS100 and input your zip code and that's it. Its also legal for the street.

 

[BamSHO]

When I was out for the first LME CAD, I asked about running unleaded race fuel and if I would gain anything. They said yes, they suggested VP Racing MS109, which is what Mike runs. I'm in the same boat as to finding unleaded racing fuel in my area.

 

[Livernois Motorsports]

The primary reasons that we recommend VP Racing Fuels is because pretty much any track or shop carries it, you can order it directly and it is the exact same quality every time that you put it in your tank. So if you are at Milan Dragway, racing on Balboni highway in Italy or lapping Lewis Hamilton in the outback we can count on the fuel being consistent. So it allows us to tune for it very effectively.

 

[brucelinc]

So, if one is running the normal 4X tune, is there a benefit to higher octane than 93? If so, how much higher is helpful and at what point is the octane so high that it degrades performance? I don't want to tune for race fuel because I don't want to run it all the time. However, if I go to the track, is there a benefit to the higher octane with the 4X tune?

 

[Livernois Motorsports]

The logic of the tune will accommodate the extra octane by adding boost and timing where it deems safe. Keep in mind, when you do go to the track you will need to have already been running that higher octane through the fuel system ahead of time for the ECU to adjust and add power.

 

[ticoscen]

Running higher octane fuel than your tune can take advantage of will actually cause you to lose power. If LMS says its timing/fueling maps can take advantage 100 octane fuel, you're good. Otherwise, you're spending more money to make your car slower.

Did they say "OK" as in it won't hurt anything or "OK" as in you'll get more power? They're 2 very different questions. Considering they have different tunes for slight changes in octane (91 vs 93, for example), I'd be surprised if a tune can account for a 7+ point jump in octane.

 

[ticoscen]

I have a 2010 SHO PP with CAI and 93 4X plus tune. I presumed 100 octane was a good idea but NO BUENO!!! Ran at Summit point today and by the second lap, was getting lots of exhaust noise from unburned fuel, rough engine and low power.
I had to pull out early from an HOD event. The 100 octane doesn't burn all the way with that tune at load and you get rough engine and lots of back fire when the engine gets hot. I will ask for a 100 octane tune option now. My bad to presume this would be OK. Car is OK. Once I hit half a tank, I'll put in some 87 octane to mix the 100 octane 50/50. That'll get me to about 93.5 octane again. Car runs ok if lite on the throttle but when pushed hard at track temperatures, its snap, crackles and pops.

 

[stripSHO]

I have a 2010 SHO PP with CAI and 93 4X plus tune. I presumed 100 octane was a good idea but NO BUENO!!! Ran at Summit point today and by the second lap, was getting lots of exhaust noise from unburned fuel, rough engine and low power.
I had to pull out early from an HOD event. The 100 octane doesn't burn all the way with that tune at load and you get rough engine and lots of back fire when the engine gets hot. I will ask for a 100 octane tune option now. My bad to presume this would be OK. Car is OK. Once I hit half a tank, I'll put in some 87 octane to mix the 100 octane 50/50. That'll get me to about 93.5 octane again. Car runs ok if lite on the throttle but when pushed hard at track temperatures, its snap, crackles and pops.

There's about a 0.0002% chance that octane was your problem. Doesn't this 1xx,*** mile car already have a history of breaking up on the course?

 

[ticoscen]

There's about a 0.0002% chance that octane was your problem. Doesn't this 1xx,*** mile car already have a history of breaking up on the course?

First track day at Shenandoah was great. So, no.
Trans over heated at VIR due to bad fluid. Got shudder and rebuilt that. That’s all redone. Today,
I did have it throw a Po305 code today from a loose coil pack bolt.Tightened it up.
Definitely was running rich at WOT when it got hot.
Backed off to 90% throttle and it smoothed out better. WOT was acting odd.

 

[ticoscen]

First track day at Shenandoah was great. So, no.
Trans over heated at VIR due to bad fluid. Got shudder and rebuilt that. That’s all redone. Today,
I did have it throw a Po305 code today from a loose coil pack bolt.Tightened it up.
Definitely was running rich at WOT when it got hot.
Backed off to 90% throttle and it smoothed out better. WOT was acting odd.

UPDATE: I had installed some RED TRQ coils before track day ASSUMING they were the same quality as MSD. They are NOT!!!!! High RPM misfires were happening and killed my track day..... I just installed the FOMOCO coils back into the car and ran it hard today and pulls hard and revs right up to 7000 RPM now, repeatedly, without misfires. TRQ RED coils are "high performance" coils for 100 bucks on eBay....chinese got me again with their cheapo bootleg engineering....

 

[stripSHO]

Glad you found the real culprit. Now, I don't know why you're shifting at 7000 rpm, but that's a different subject probably better suited to another thread.

 

[76FoMoCo]

Glad you found the real culprit. Now, I don't know why you're shifting at 7000 rpm, but that's a different subject probably better suited to another thread.

LM@o 7k on a 3.5 WOW! bet the torque curve at the end looks like a skydive.

 

[ticoscen]

It shifted close to that....like 6200 or so at WOT with some hard launches.