A question about tunes and octane
09-30-2010, 09:31 PM
#11
6th Gear Member
A few gallons of 87 mixed with 92 octane won't hurt anything. The PCM can adjust for minor octane deviations. But if you feel better, then run a tank of 92 before uploading the 92 tune. As mentioned above, you can run a higher octane than the tune calls for with ill-effect; you just won't get the perfromance of the higher octane.
Also, many people carry the tuner in their car. I've been on roadtrips on 2 occasions where I was in the middle of bumfuk and could only get 87 octane. I was back on the road in less than 4 minutes.
Also, many people carry the tuner in their car. I've been on roadtrips on 2 occasions where I was in the middle of bumfuk and could only get 87 octane. I was back on the road in less than 4 minutes.
10-01-2010, 08:11 AM
#14
6th Gear Member
Not to burst a bubble, but don't expect to see major differences going from the 87 custom tune to the 92 custom tune. Yes, there WILL be some changes but more likely the changes are in the CHARACTERISTICS of the tune (how it pulls in certain RPM ranges) than overall kick-in-the-pants changes. The most noticeable change is from the stock 87 to the custom 87. After that, the change from the custom 87 to any of the higher octane custom tunes is a bit less pronounced, but still an improvement.
I always recommend that folks get a good, spirited drive under their belt while stock and then start with the custom 87 tune and then work up from there. Otherwise, it's very difficult to distinguish the subtle (and not so subtle) differences.
I always recommend that folks get a good, spirited drive under their belt while stock and then start with the custom 87 tune and then work up from there. Otherwise, it's very difficult to distinguish the subtle (and not so subtle) differences.
10-01-2010, 07:38 PM
#15
10-01-2010, 08:03 PM
#16
4th Gear Member
Join Date: May 2010
Location: Temple, TX
Posts: 1,277
Only problem is what about the fuel still left in the line from the tank to the fuel rail... I dunno. I give up...
You guys are good for a laugh anytime. Thanks... I hope I added to this discussion (with a little chuckle)...
Don
10-02-2010, 10:22 AM
#18
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
Just be aware that if you like to be a filling up with gas
and while you are a waiting for the nozzle to go a clicka,
and you havea your ignition on so that you can procede
to a change tunes, there is a key on gas fill mode a that
you DO NOT WANT TO GET INTO.
This can be avoided by putting on the parking brake and
the SJB will not go into whats called RECOVERY MODE.
(sorks bad for 50 mins or so)
The more you know.....
and while you are a waiting for the nozzle to go a clicka,
and you havea your ignition on so that you can procede
to a change tunes, there is a key on gas fill mode a that
you DO NOT WANT TO GET INTO.
This can be avoided by putting on the parking brake and
the SJB will not go into whats called RECOVERY MODE.
(sorks bad for 50 mins or so)
The more you know.....
10-05-2010, 09:37 AM
#19
3rd Gear Member
Join Date: Mar 2006
Location: New Hampshire
Posts: 854
Just be aware that if you like to be a filling up with gas
and while you are a waiting for the nozzle to go a clicka,
and you havea your ignition on so that you can procede
to a change tunes, there is a key on gas fill mode a that
you DO NOT WANT TO GET INTO.
This can be avoided by putting on the parking brake and
the SJB will not go into whats called RECOVERY MODE.
(sorks bad for 50 mins or so)
The more you know.....
and while you are a waiting for the nozzle to go a clicka,
and you havea your ignition on so that you can procede
to a change tunes, there is a key on gas fill mode a that
you DO NOT WANT TO GET INTO.
This can be avoided by putting on the parking brake and
the SJB will not go into whats called RECOVERY MODE.
(sorks bad for 50 mins or so)
The more you know.....
Not that I would ever try reloading the tune while filling up, but this has peeked my interest!
