718 GT4?
#1561
I had a tune on my WRX back in the day and remember paging through the COBB Accessport files and there was a program called ACN 91 which stood for Arizona, California, Nevada 91 octane. Apparently we all share the same garbo fuel.
#1562
Addict
Rennlist Member
Rennlist Member
Yeah, we only have 91 here too (ok for the GT3, since the high altitude effectively lowers the compression and need for octane). And for Turbo cars, there's the option of E85...
#1563
Rennlist Member
One wonders why fuel sellers even bother with the 89 button in the middle? Does anyone actually buy the mid-grade stuff? Would be so much better if gas stations offered 87 regular, 91 premium, and 93 performance. They might even make more money off of 93 or 95 than they do from the mid-grade stuff...
#1565
91-octane gas significantly reduced my enjoyment of my GT4, causing a torque trough from 3000~ to 5500 rpm that I didn't experience in Euro GT4s or my car after the computer was reset. A week later, it was back. Ditto for a friend with a GT4 locally. ECU reset and no more flat spot...for about a week until the computer learned it didn't like CA 91.
One wonders why fuel sellers even bother with the 89 button in the middle? Does anyone actually buy the mid-grade stuff? Would be so much better if gas stations offered 87 regular, 91 premium, and 93 performance. They might even make more money off of 93 or 95 than they do from the mid-grade stuff...
One wonders why fuel sellers even bother with the 89 button in the middle? Does anyone actually buy the mid-grade stuff? Would be so much better if gas stations offered 87 regular, 91 premium, and 93 performance. They might even make more money off of 93 or 95 than they do from the mid-grade stuff...
#1568
Drifting
One wonders why fuel sellers even bother with the 89 button in the middle? Does anyone actually buy the mid-grade stuff? Would be so much better if gas stations offered 87 regular, 91 premium, and 93 performance. They might even make more money off of 93 or 95 than they do from the mid-grade stuff...
What does the GT4 call for? I assumed 91 and just put in 93 since that's all we have that meets the 91 requirement. But I wouldn't have thought 93 would run any better in it than 91. Interesting that it does in your case.
#1569
I did several COBB datalogs with John from BGB trying to diagnose a timing issue and the limits of tuning on really hot weather...it all went back to the quality of the gas.
The GT4 is right on the edge of detonation and any correction will pull the ignition back several degrees...so you are belter off starting with less advanced timing than allowing the ECU to adjust if your gas is not up to specs.
Try to find the best gas you can.....93 is the best but is has to be pure 93 not the ethanol mixtures as we found that 93 octane but with 10% ethanol (which really is a 91 with some ethanol) is a no-go on the GT4.....on the other hand our F80 M3 ZCP loves that stuff.
I found a good 93 gas station and always fill up there...and for the track I fill with Sunoco GT260 which is 100-octane unleaded, just for safely but it gets very expensive.
Porsche also recently launched the Kerapur gasoline additive.....according to the service department at my dealer they had to provide these to different markets and they rank 1,2 3 the quality of the gas on that market....ours rank 3 so you can imagine and they highly recommend using Kerapur on every fill-up.
The GT4 is right on the edge of detonation and any correction will pull the ignition back several degrees...so you are belter off starting with less advanced timing than allowing the ECU to adjust if your gas is not up to specs.
Try to find the best gas you can.....93 is the best but is has to be pure 93 not the ethanol mixtures as we found that 93 octane but with 10% ethanol (which really is a 91 with some ethanol) is a no-go on the GT4.....on the other hand our F80 M3 ZCP loves that stuff.
I found a good 93 gas station and always fill up there...and for the track I fill with Sunoco GT260 which is 100-octane unleaded, just for safely but it gets very expensive.
Porsche also recently launched the Kerapur gasoline additive.....according to the service department at my dealer they had to provide these to different markets and they rank 1,2 3 the quality of the gas on that market....ours rank 3 so you can imagine and they highly recommend using Kerapur on every fill-up.
#1570
Porsche also recently launched the Kerapur gasoline additive.....according to the service department at my dealer they had to provide these to different markets and they rank 1,2 3 the quality of the gas on that market....ours rank 3 so you can imagine and they highly recommend using Kerapur on every fill-up.
#1571
That sounds more like something the dealer is pushing than Porsche. It doesn't appear on this list.
As for not being on that list it could be produce and marketed by other company...and Porsche just re-labels it....don't know.
Let me see if I can find the literature for it.....
#1572
Ohhh, my bad.... is Keropur and manufactured by BASF
#1573
I can totally feel the difference on my bikes with ethanol free 93 octane vs 93 with ethanol. Bike feels like it's just got more torque across all the gears so it accelerates harder for the same amount of twist I give it. It's a great feeling so I usually fill up at that gas station that's up in the mountains on my ride back. I should start doing that with my Spyder next time I am up there. I should probably take some cans and fill them up and bring them back with me!
#1575