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Old 07-26-2010, 05:45 AM   #1 (permalink)
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Difference between 91 and 93 octane tunes?

I just ordered a Predator and AFE CAI from Maryland Speed. Trying to decide which tune to install when it arrives. Is there a noticable difference between the 91 and 93 octace tunes?

Jason
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Old 07-26-2010, 11:27 AM   #2 (permalink)
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Quote:
Originally Posted by JClishe View Post
I just ordered a Predator and AFE CAI from Maryland Speed. Trying to decide which tune to install when it arrives. Is there a noticable difference between the 91 and 93 octace tunes?

Jason
Once you get the Predator you can answer your own question.

Presumably you have the 91 octane already in the tank, so install the 91 octane tune and go. Run until the tank is nearly empty.

Then the next time you need fuel fill it with 93 octane, change the tune to 93, and go.

Let you your butt dynometer tell you if there is any difference.
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Old 07-26-2010, 12:02 PM   #3 (permalink)
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Here is a difference that I have discovered.

This past weekend, we did a 700 mile round trip with our 08 SRT8, with a 91 octane Predator Tune. We drove as we always do, and the car returned a very respectable 22.8 miles to the US Gallon - even with a couple of 100 mile 80 mph freeway stretches and some slow sections on 2 lanes with heavy traffic.

On my 06 SRT8 I run the 93 octane tune and fuel. I cannot get that kind of mileage with that tune - usually 3 -4 mpg lower.
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Old 07-26-2010, 02:10 PM   #4 (permalink)
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Glad you guys chimed in. My answer was/is the different. It's 2
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Old 07-26-2010, 04:29 PM   #5 (permalink)
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Quote:
Originally Posted by Northern Rider View Post
On my 06 SRT8 I run the 93 octane tune and fuel. I cannot get that kind of mileage with that tune - usually 3 -4 mpg lower.
You had posted before you run the 93 Tune on 91 gas, do you still do that? I tried it and the car didn't seem too happy about it, where do you buy your gas?
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Old 07-26-2010, 05:12 PM   #6 (permalink)
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Impressive difference Northern! That '08 may be exceptional, because that is pretty good mileage for a 6.1, nice work. I would say that I would have to run about 60 mph to get 22 mpg no matter what tune I was running. I am going to take it on a 500 mi drive this weekend, so I will have to check it out. I have not noticed much difference if any mpg between tunes on the freeway myself with the '06.

The tunes have different advance curves and ultimately higher advance and a little more fuel on the top end, but what do you suppose would effect basically closed loop A/F ratio's etc on the freeway? I can feel and see a difference with logging those tunes at part and WOT. I have read about and logged about two degrees additional advance between the 91 and 93 CAI tunes at WOT FYI. You need some good gas to make the 93 octane tune work.
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Old 07-26-2010, 06:06 PM   #7 (permalink)
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You had posted before you run the 93 Tune on 91 gas, do you still do that? I tried it and the car didn't seem too happy about it, where do you buy your gas?
I did experiment with that, at one time. You're right - the car doesn't like it.

I actually run Sunoco 94 octane (available in Ontario) now with the 93 tune - car is very happy!
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Old 07-26-2010, 06:09 PM   #8 (permalink)
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Originally Posted by DGatzby1 View Post
Impressive difference Northern! That '08 may be exceptional, because that is pretty good mileage for a 6.1, nice work. I would say that I would have to run about 60 mph to get 22 mpg no matter what tune I was running. I am going to take it on a 500 mi drive this weekend, so I will have to check it out. I have not noticed much difference if any mpg between tunes on the freeway myself with the '06.

The tunes have different advance curves and ultimately higher advance and a little more fuel on the top end, but what do you suppose would effect basically closed loop A/F ratio's etc on the freeway? I can feel and see a difference with logging those tunes at part and WOT. I have read about and logged about two degrees additional advance between the 91 and 93 CAI tunes at WOT FYI. You need some good gas to make the 93 octane tune work.
Actually, I just bought a used Predator from a member here to tune the 08, and just installed the tune 2 weeks ago. Before that, the mileage was never over 20 mpg.

In the 08, I will leave the stock tune in, but on the 06 I am reading up on a CMR tune and may take it onto a dyno, as power is the name of the game for that car.
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Old 07-26-2010, 06:33 PM   #9 (permalink)
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^^ I will swap in the 91 CAI tune and a Diablo-Toona tune (this tune has great drive-ability and throttle response) and see if there is a difference this weekend on the freeway and report back. I just can't bring myself to even test the stock program, besides if I return to stock I would loose all of the custom programs until it meets the computer again. Another good reason to not return to stock.
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Old 07-26-2010, 07:27 PM   #10 (permalink)
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Sorry - when i said I will leave the "stock" tune in, I didn't mean the stock Chrysler program - I meant the Diablo 91 octane tune.

Look forward to hearing about your custom Predator tune . . .
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