Loren Forsmint New Member 1 Member For: 2y 10m 12d Posted 23/08/22 09:50 AM Share Posted 23/08/22 09:50 AM Hi guys, I’ve owned my FG turbo for a while now. Recently I’ve started making a little more and switched to putting 98 octane in the tank. There’s been a noticeable increase in responsiveness and power, which has been nice and it’s making me wonder if it’s been dyno tuned for it. The car has an intake and battery relo, bigger intercooler, and exhaust. As for injectors, turbo, and fuel system I assume it’s stock. The previous owner never mentioned it being tuned, and given the mods made by the owner before him I’m starting to bet it has been, likely on 98. My question therefore is whether or not the year I’ve run it on 91 has caused any damage. Other articles say that cars designed to run on 98 from the manufacturer can experience knocking and premature combustion, but obviously stock falcons are designed to run on cheap fuel. I’ve kept it regularly serviced, but is there a chance I’ve caused some amount of long term damage running it on 91 for the last 40000 kilometres? Thanks. Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/ Share on other sites More sharing options...
hjtrbo Bronze Donating Members 328 Member For: 14y 5m 16d Posted 23/08/22 10:06 AM Share Posted 23/08/22 10:06 AM Absolutely possible. Or completly fine. It all depends on if it was tuned or not. Need to find that out. Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713956 Share on other sites More sharing options...
Rob70 Silver Donating Members 82 Member For: 5y 2m 25d Gender: Male Location: Wellington, NZ Posted 24/08/22 06:02 AM Share Posted 24/08/22 06:02 AM Pretty sure the handbook says 98 recommended, 95 is OK, 91 emergency only, or something to that effect, and that's factory tune. Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713978 Share on other sites More sharing options...
hjtrbo Bronze Donating Members 328 Member For: 14y 5m 16d Posted 24/08/22 07:09 AM Share Posted 24/08/22 07:09 AM If that is indeed true then I suggest the OP does some investigative work to determine if there is damage to the pistons ring lands, valves, piston tops etc etc... Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713981 Share on other sites More sharing options...
Rab WOT? Moderating Team 10,981 Member For: 12y 4m 10d Gender: Male Location: Frankston, 3199 Posted 24/08/22 08:04 AM Share Posted 24/08/22 08:04 AM Both the I6 Turbo and Boss 290 will run on 91RON without ill effect, says Ford. Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713983 Share on other sites More sharing options...
Tom Tucker Donating Members 704 Member For: 6y 5d Posted 24/08/22 08:28 AM Share Posted 24/08/22 08:28 AM It'll be fine Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713985 Share on other sites More sharing options...
hjtrbo Bronze Donating Members 328 Member For: 14y 5m 16d Posted 24/08/22 09:12 AM Share Posted 24/08/22 09:12 AM 1 hour ago, Rab said: Both the I6 Turbo and Boss 290 will run on 91RON without ill effect, says Ford. Good news then for the OP if it's a virgin PCM. Now just to find out if there is a tune in there??? Link to comment https://www.fordxr6turbo.com/forum/topic/96779-using-91-in-a-car-tuned-for-98/#findComment-1713987 Share on other sites More sharing options...
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