Superchips power programmer
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Elder User
Joined: Mar 2007
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From: Canyon Country
Superchips power programmer
I have a 02' Screw 4x4 4.6l 65,000 miles.
I was wondering why they say to use 91 octane fuel when using the Tow/performance and High performance settings? Is this just to gain top performance with the tune? I forgot I put the tow/performance tune on my truck while filling up with 87 octane and I didn't notice any ill effects like running lean (pinging/detonation) or fault codes, I ran about a half tank before I realized it...oop's. I have since switched back to the 87/economy tune just in case. I would like to go back to the Tow mode with 87 octane because I really liked the low end torque for around town. (alot of hills out here).
I was wondering why they say to use 91 octane fuel when using the Tow/performance and High performance settings? Is this just to gain top performance with the tune? I forgot I put the tow/performance tune on my truck while filling up with 87 octane and I didn't notice any ill effects like running lean (pinging/detonation) or fault codes, I ran about a half tank before I realized it...oop's. I have since switched back to the 87/economy tune just in case. I would like to go back to the Tow mode with 87 octane because I really liked the low end torque for around town. (alot of hills out here).
Tuned
Joined: Dec 1999
Posts: 464
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From: Bismarck USA
I sure thought it was because the higher tune advances the timing a fair amount. You should have had some pinging without it.
You notice any power difference when dropping back to the 87 tune? Only reason I ask is because the tune changes the shift points as well. So maybe you weren't on the throttle enough to see the power change. You're only seeing transmission changes.
I don't have a tuner, so I'm only throwing out ideas here.
You notice any power difference when dropping back to the 87 tune? Only reason I ask is because the tune changes the shift points as well. So maybe you weren't on the throttle enough to see the power change. You're only seeing transmission changes.
I don't have a tuner, so I'm only throwing out ideas here.
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Elder User
Joined: Mar 2007
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From: Canyon Country
That's what I thought that the timing and fuel curves were the difference in tunes...no noticeable pinging/knocking...but I also am running the truck unloaded, I would assume I would get pinging with it loaded up though. I have not tried the 91 performance setting with the 87 gas...and don't think I will.
There was a loss of power when I changed back to the 87 economy tune, and I want it back on the cheap gas. lol but I don't want to damage the engine either...
There was a loss of power when I changed back to the 87 economy tune, and I want it back on the cheap gas. lol but I don't want to damage the engine either...
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