Racing fuel 100/110 octane
10-15-15, 06:57 AM
#46
Driver School Candidate
100 octane?
giving these cars have high compression I would have imagine at high intake air temps the computer would start to pull timing because of maybe sensing knock or about to sense knock, SO I figure running 100 octane the ecu would allow it to run higher timing by pull less timing, but im just speculating. Have anyone dynowed or ran at the track with 100 octane vs 93 octane
10-16-15, 10:18 AM
#47
giving these cars have high compression I would have imagine at high intake air temps the computer would start to pull timing because of maybe sensing knock or about to sense knock, SO I figure running 100 octane the ecu would allow it to run higher timing by pull less timing, but im just speculating. Have anyone dynowed or ran at the track with 100 octane vs 93 octane
10-20-15, 10:51 AM
#48
Driver School Candidate
I tend to agree, it would likely take a couple tanks of higher octane to see the full benefits. I typically run 94oct. I would like to do some testing with 20L of 100+ octane added to the tank over 3-4 tanks to see if the ECU has ability to adjust and show some increases in power. Like you say the ECU may be pulling a bit of timing as is. The ISF is in a compression range that is often recommended to use high octane fuels.
11-26-15, 01:00 PM
#49
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I have a brand a lexus IS350 F Sport 2015 with less than 10K miles on it. I have used racing fuel 110 mixed with 100 and 93 and one time 110 mixed with 93. The high octane does make a difference which you feel, in addition, I have raced the car and pulled 7 cars on a RC 350 F sport and 2 cars and a hal on a G37.
Let me also mention, to all the haterz out there that have nothing to do other than to talk ****, try this yourself before talking non sense.
All sensors working with no issues...
Let me also mention, to all the haterz out there that have nothing to do other than to talk ****, try this yourself before talking non sense.
All sensors working with no issues...
11-26-15, 01:21 PM
#50
I have a brand a lexus IS350 F Sport 2015 with less than 10K miles on it. I have used racing fuel 110 mixed with 100 and 93 and one time 110 mixed with 93. The high octane does make a difference which you feel, in addition, I have raced the car and pulled 7 cars on a RC 350 F sport and 2 cars and a hal on a G37. Let me also mention, to all the haterz out there that have nothing to do other than to talk ****, try this yourself before talking non sense. All sensors working with no issues...
11-26-15, 02:26 PM
#52
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And the race was done on a 3 lane street the rc 350, g37 and my car at the same time. Rolling on 1st gear @ 25Mph. If im not mistaken my Rps were at around 4,500 when I jumped
11-27-15, 06:12 AM
#53
Tech Info Resource
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I have a brand a lexus IS350 F Sport 2015 with less than 10K miles on it. I have used racing fuel 110 mixed with 100 and 93 and one time 110 mixed with 93. The high octane does make a difference which you feel, in addition, I have raced the car and pulled 7 cars on a RC 350 F sport and 2 cars and a hal on a G37.
Let me also mention, to all the haterz out there that have nothing to do other than to talk ****, try this yourself before talking non sense.
All sensors working with no issues...
Let me also mention, to all the haterz out there that have nothing to do other than to talk ****, try this yourself before talking non sense.
All sensors working with no issues...
11-29-15, 05:15 AM
#55
Racer
I hardly ever put race fuel in my car, But what I do try and do is fill up from a new gas station that was built and the difference between filling my car up with crappy dirty gas vs clean gas is very noticeable for me.
I'm talking about crappy fuel being < 93 octane and clean fuel as being around 93 octane.
I would have thought that a slightly better octane say 95 would give you better performance, but hearing you guys I will now assume you'll get nothing which is hard for me to believe.
I can understand if were talking about race fuel of octane above 100.
I'm talking about crappy fuel being < 93 octane and clean fuel as being around 93 octane.
I would have thought that a slightly better octane say 95 would give you better performance, but hearing you guys I will now assume you'll get nothing which is hard for me to believe.
I can understand if were talking about race fuel of octane above 100.
11-29-15, 08:28 AM
#56
Defratos, the car is calibrated for premium unleaded, which means optimizing ignition timing (and of course fueling) on that particular fuel and we can also make the assumption that it's to some degree conservative and not on the edge of what 93 octane could handle.
If the fuel quality is low, the ecu can pull timing via the knock sensors to protect the engine which may end up pushing it into a low octane timing table again, for engine protection until the next time the car is fueled and knock may relearn into the high octane table.
On the other hand, there is nothing in the calibration that would add timing for higher octane fuel (assuming that higher octane fuel and more timing would even result in a power gain, it may not). Also since most race fuel is not 10% ethanol like pump 93, part throttle fuel trims will go slightly negative due to higher stoich of pure gasoline but would still run slightly richer at wide open throttle, possibly then reducing power over 93.
It might pick up some power on ms109e just because it's oxygenated and also because of it's slightly richer stoich value it would lean the car out a bit at wide open throttle (though would likely self compensate after ecu learns long term positive fuel trims).
Either way, this could only be tested/confirmed on a back to back dyno or 1/4 mile trap speed. To just say it -feels- faster doesn't equate to any real proof.
If the fuel quality is low, the ecu can pull timing via the knock sensors to protect the engine which may end up pushing it into a low octane timing table again, for engine protection until the next time the car is fueled and knock may relearn into the high octane table.
On the other hand, there is nothing in the calibration that would add timing for higher octane fuel (assuming that higher octane fuel and more timing would even result in a power gain, it may not). Also since most race fuel is not 10% ethanol like pump 93, part throttle fuel trims will go slightly negative due to higher stoich of pure gasoline but would still run slightly richer at wide open throttle, possibly then reducing power over 93.
It might pick up some power on ms109e just because it's oxygenated and also because of it's slightly richer stoich value it would lean the car out a bit at wide open throttle (though would likely self compensate after ecu learns long term positive fuel trims).
Either way, this could only be tested/confirmed on a back to back dyno or 1/4 mile trap speed. To just say it -feels- faster doesn't equate to any real proof.
11-29-15, 10:14 AM
#57
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And let me add something i forgot to say. I drive in S+ most of the time and when i have added the octane 100 and 110 before ive noticed that the gass would last more before i have to put gas again. Not sure if this make any sense but it is another observation.
11-29-15, 06:48 PM
#58
Tech Info Resource
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I have actually seen power losses from running high octane fuel in engines not tuned for it. If you do the homework on how gasoline is formulated for higher detonation resistance, it's not hard to see why this happens.
Measured, not felt.
Measured, not felt.
06-29-18, 03:15 AM
#59
Driver School Candidate
Expensive!
I used to use this kind of fuel at the race track on my motorcycle, besides the fact that it smells different and it leaves a white powder residue on the exhaust tips, I really never noticed any advantage to using it. Not sure how it can make a difference in a street car. It sure did put a dent in my wallet...
