anyone use Octane booster in their 991.2 GT3?
03-29-2018, 12:33 PM
#31
Instructor
Chemically regular octane boosters are snake oil as someone mentioned before. They are however, a good business model, spend 20cents worth of benzene, add some color and sell it for $10-$30. They are a s good as Slick50 or any other additive. Take a look at t
or
or
in YouTube, and be open minded. They do a lot of consistent practical tests.
If you are willing to dump orange or yellow snake oil in your engine then look at Toluene.
Toluene and xylene (a very close cousin of toluene) are safe and effective gasoline additives which increase octane number. Pump gasoline generally already contains at least 10% and possibly as high as 30% of these "aromatic hydrocarbons"...
Because gasoline already contains toluene and xylene, the components of your fuel system will not be adversely affected by use of toluene or xylene as an octane booster. it is a lot more refined than any of the crap you can buy at an auto store. But it has to be really good quality to make a difference.
When I was young and not so smart, I used it in my 9ff 750hp 2008 Cayenne Turbo with with "good" results. Now I just stick to either race fuel or 91/93 standard fuel depending where I am in the US
If you are willing to dump orange or yellow snake oil in your engine then look at Toluene.
Toluene and xylene (a very close cousin of toluene) are safe and effective gasoline additives which increase octane number. Pump gasoline generally already contains at least 10% and possibly as high as 30% of these "aromatic hydrocarbons"...
Because gasoline already contains toluene and xylene, the components of your fuel system will not be adversely affected by use of toluene or xylene as an octane booster. it is a lot more refined than any of the crap you can buy at an auto store. But it has to be really good quality to make a difference.
When I was young and not so smart, I used it in my 9ff 750hp 2008 Cayenne Turbo with with "good" results. Now I just stick to either race fuel or 91/93 standard fuel depending where I am in the US
Last edited by astolfor; 03-29-2018 at 12:57 PM.
03-29-2018, 01:04 PM
#32
Race Director
Thank you, good info. As I've had a few gt3 friends in California mention pinging with our 91 gas, I was wondering if this was a worthwhile issue to explore. From what I understand our ecu adjusts.. but then does it make any difference to put 100 octane when you can find it??
03-29-2018, 01:14 PM
#33
Instructor
Thank you, good info. As I've had a few gt3 friends in California mention pinging with our 91 gas, I was wondering if this was a worthwhile issue to explore. From what I understand our ecu adjusts.. but then does it make any difference to put 100 octane when you can find it??
Someone that knows mappings could answer this better than me.
I use race fuel 100octane because I mix it with 91octane to get to 95octane in my 4c, GTr and AMG63s because I cant buy 92-95octane in Washington state.
03-29-2018, 01:16 PM
#34
Drifting
I wouldn't fill up on 100 octane. Waste of money. But I would put a few gallons in with 91 to bring the mix up to 93 or so. The ECU does adjust for whatever octane. I don't really know how fast it does though. Like does it constantly monitor and adjust in real time? Or does it take a tank or two for the ECU to remap? I don't know.
03-29-2018, 01:18 PM
#35
Addict
Rennlist Member
Rennlist Member
Thank you, good info. As I've had a few gt3 friends in California mention pinging with our 91 gas, I was wondering if this was a worthwhile issue to explore. From what I understand our ecu adjusts.. but then does it make any difference to put 100 octane when you can find it??
In Colorado, we also only get 91 (aside from race fuel and E85), but the low air density from the altitude makes the engine behave like it has a lower compression ratio. So, there really is not much benefit to anything more than 91 at high altitude (for an NA motor on stock tune).
03-29-2018, 01:55 PM
#36
Rennlist Member
I can't say I've ever heard detonation in any GT car I've owned running CA 91; not even at the track in 100+ heat. Further, the ECU's on modern cars are so good at regulating detonation, fueling, O2 and timing that I can't imagine octane booster really helping much. I could see adding some 100 octane for really hot days at the track for some added piece of mind but I'm not sure they are that fragile that it's required.
03-29-2018, 02:07 PM
#37
Addict
Rennlist Member
Rennlist Member
I can't say I've ever heard detonation in any GT car I've owned running CA 91; not even at the track in 100+ heat. Further, the ECU's on modern cars are so good at regulating detonation, fueling, O2 and timing that I can't imagine octane booster really helping much. I could see adding some 100 octane for really hot days at the track for some added piece of mind but I'm not sure they are that fragile that it's required.
03-29-2018, 03:46 PM
#38
Instructor
To this date I haven’t found a octane booster that stopped the pinging on a carbureted , non computer controlled car. I’m a big believer of blending some race fuel , i know it gets the job done .
Both my F12 and GT3 briefly ping on low revs, Unfortnatley all we have in so cal is 91 at the pump, even that’s questionable if it’s really 91, so yes I do blend 10 gal of 100 in the F12 n 5 gal in the GT3 14gal fuel tank , No more ping and very noticeable change in the throttle response
Both my F12 and GT3 briefly ping on low revs, Unfortnatley all we have in so cal is 91 at the pump, even that’s questionable if it’s really 91, so yes I do blend 10 gal of 100 in the F12 n 5 gal in the GT3 14gal fuel tank , No more ping and very noticeable change in the throttle response
03-30-2018, 01:28 AM
#39
I agree that the GT3 should not detonate on 91 octane, even under extreme conditions. But the way the GT3 ensures its survival under those conditions is to retard the ignition timing (safe for the car, but you lose some power and throttle response). So ideally, adding a little race fuel should theoretically be a benefit.
03-30-2018, 01:32 AM
#40
Drifting
Is E85 something that would work in place of actual 100 octane unleaded? To mix with 91 I mean.
03-30-2018, 01:34 AM
#41
03-30-2018, 06:35 AM
#42
Never used booster, but here in L.A. we've got a few Unocals that have 100, which I try to get as often as possible. and yes I notice a big difference in performance in my 991.1.
03-30-2018, 07:04 AM
#43
ARS RACING fuels
Gas Station
1635 W ******* St
(562) 432-1301
Closed ⋅ Opens 8AM
76
Gas Station
100 Beach Blvd
(714) 761-1076
76
Gas Station
3631 Santa Fe Ave
(562) 981-2918
Open 24 hours
76
Gas Station
1542 W Willow St
(562) 492-6475
Open 24 hours
76
Gas Station
1410 W Pacific Coast Hwy
(562) 495-4384
Open 24 hours
76
Gas Station
465 W Pacific Coast Hwy
(714) 375-4700
Open 24 hours
76
Gas Station
5404 W 190th St
(310) 542-0368
Closed ⋅ Opens 5AM
76
Gas Station
16719 Lakewood Blvd
(562) 633-9176
Open 24 hours
76
Gas Station
4870 Bellflower Blvd
(562) 425-1603
Open 24 hours
Mobil
Gas Station
22240 N Avalon Blvd
(310) 522-4377
Open 24 hours
Mobil
Gas Station
5005 Long Beach Boulevard
(562) 422-2086
Open 24 hours
Mobil
Gas Station
2601 Atlantic Ave
(562) 424-1348
Open 24 hours
WEBSITE
DIRECTIONS
Mobil
Gas Station
127 W Pacific Coast Hwy
(562) 591-7976
Open 24 hours
Mobil
Gas Station
3400 E Anaheim St
(562) 597-0813
Open 24 hours
Propel Fuels
Alternative Fuel Station
701 W Torrance Blvd
(800) 871-0773
Open 24 hours
Propel Fuels
Alternative Fuel Station
1250 Sepulveda Blvd
(800) 871-0773
Open 24 hours
Propel Fuels
Alternative Fuel Station
6819 E Carson St
(800) 871-0773
Open 24 hours
76
Gas Station
10211 Alondra Blvd
(562) 804-5487
Open 24 hours
Propel Fuels
Alternative Fuel Station
1401 W Pacific Coast Hwy
(800) 871-0773
Open 24 hours
03-30-2018, 09:14 AM
#44
Race Car
03-30-2018, 11:12 AM
#45
The stock 997.2 GT3 fuel injectors were large enough to accommodate for E85. All I had to do was tune. 396whp sae stock on 93 octane. 430whp sae on E85 with Akrapovic Race exhaust, intake filter, and tune on the same dyno in 95 degree Florida weather.