Yea the 87 is essentially worthless on the SC. If you're gonna get a tuner for your truck go big or go home. Do the 91 tune

 

Yeah I just noticed he said he had the 03 also. Which means he paid more for a tuner that never would help anyway or any more than a SC3815

He could do the TMR mod and that's free!

 

I run the 87 tune, and im more then happy with it. I opted out on the shift firmness, because why do I want fly wheel or trans problems down the road. I feel a decent difference in tuning, and mpg, add a CAI and efan. And youll notice a huge difference in performance and MPG.

As for running 91, its an extra 10 cent a Litre up north. Running that gas negates the whole idea of saving my money. But from a performance stance, I can see it being worth it. Maybe ill try a tank of 91, and see what I think.

And the trans option. Does it give you any noticable gains in MPG? or is it just a performance feature? I.E making the 1st 3 gears shorter so I can drive in higher gears at lower speeds, to gain some MPG or does the engine work harder to keep that gear, negating the MPG aspect?

 

I paid $225 which seems more than fair................for what it is.

 

And 225 is fair but what Im saying is you could have saved more or spent less by getting the SC3815 for the 03 and did the TMR mod

What you have will work and work fine. The only diff between the 3865 and the 3815 is the 3865 can do the trans tuning whereas the 3815 cannot. And there is no trans tuning avail for the 03 at all because the PCM/TCM are separate

As for the price difference on average of 10 cents from 87 to 89, whats .10x26 gals?

$2.60 isnt going to break ANYONES bank acct here so IMO, everyone one here should put in 89 at a minimum.

87 to 93 here on avg is .20 to .30 cents difference. Thats still small change IMO if you fill the tank up, even less if youre just adding a few gallons or just topping it off.

 

Plus the gains you get performance and MPG wise make up for the extra $5 you spend to use 91/93. I only have 93 around me so I'm paying more than I need to but it doesn't break my bank anymore than getting 89 (which is the bare minimum I would ever use). I just dont eat out as much so it's good for you health wise too

 

The tunes are much better on '04+ trucks, but the HP & Torque gains on the '03 Hemi is not bad. Although I do have to question why anyone would think that purchasing a tuner and running a tune that allows the use of 87 octane fuel when the truck's stock tune recommends 89 octane would net any significant gains. The tune would have to retard timing to run 87 octane with no pre-detonation...

 

BUT, I think he can do a FREE Torque Management Mod being that he's an '03. I know Hammer did it with his '04.
He has to jumper a wire in his relay box. Hammer has a Thread in the Faq section about this. The amount of Torque Management(HP remover basically) is ridiculous. Stock setting for my '08 was 80% loss between shifts....puke... no wonder they gave Lifetime Drivetrain Warranties.

 

10 cents a litre not gallon. So 10 bucks a tank, for a little more butt dyno, and no marginal gain in MPG to offset the initial $10.
And if I want to feel fast I drive my bike, not an 8000lb truck.

4 quarts = gallon right ( i think) 948ml per quart

im paying 1.099 per litre
that turns to 4.167 a gallon. thats for 87, add another 35 - 40 cents or so for 91

Base Hemi- Automatic Tansmission

The standard or "base" Hemi engine has a slightly lower compression than the SRT8 performance version. When the Hemi is matched with an automatic transmission, Chrysler recommends 89 octane fuel for peak performance. 87 octane is the minimum octane rating listed for the base Hemi regardless of transmission

Minimum works fine for me.

your all making me wonder why Superchips would even put an 87 tune or a mileage tune on there programs, maybe there missing some information.... the hemi only does 9.6:1 ratio. My Bike on the other hand needs 91+ because of its 12:1 ratio.

Sorry just dont feel the hype with the 91 crowd.

 

This topic has been debated over and over and over (87 v 89), here's a little summary of some of it

https://dodgeforum.com/forum/4th-gen...87-octane.html

It may be "ok" to run 87 octance, but as dirty and hammer say in that link , almost every guy who has had cylinder failure was running 87. Now, im sure there are plenty of people doing it who have not had any problems, but there is undeniably a greater risk running the 87 than 89. The question is are you willing to take that risk. Chances are you probably will be fine, but if you blow a piston bc of 87 gas, well that'd sure suck.