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Old 09-11-2012, 09:41 AM   #1
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V6 V.s. V8

Im looking at new jeep and I'm probably going to stick to the TJ's. I was wondering if anyone had any idea of what the difference in gas mileage would be between a 6 and 8 cyl.

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Old 09-11-2012, 09:46 AM   #2
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The v8 is an after market swap the tj came with a 2.5 4 cylinder or a inline 6

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Old 09-11-2012, 09:47 AM   #3
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Good luck finding a V6 in a TJ since the TJs came with an I6 .

And if you find a V8 in a TJ...you may really want to consider it since those aren't factory either

TJs came factory with the 2.5L I4 and the 4.0L I6...in most cases you will see about the same mileage between the two. If you have the option to get a jeep with the 4.0, do it because you wont regret it. There will be more power with little to no loss in mileage.
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Old 09-11-2012, 05:51 PM   #4
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Step 1: Get an I6 4.0L
Step 2: Buy a Diablosport T-1000 (Trinity)
Step 3: Fill tank with 93 octane (or higher, if available)
Step 4: Load pre-canned 93 performance tune
Step 5: ??????
Step 6: Profit!

This really woke up my Jeep. Being big into the performance world, I had a Trinity waiting at my house the day I got the Jeep home. I'll be adding some basic bolt-ons (intake, header, exhaust) and that should keep my happy for a while. Unless you need the power of a V8, I'd probably stay away. Then again, Chevy 350s and Hemi 5.7s and 6.1s are quite fun ^_^
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Old 09-11-2012, 06:24 PM   #5
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Running a higher octane than the engine was designed for does literally nothing for performance. In fact, since higher octane fuels burn slower and are harder to ignite than lower octanes, running a higher octane than the engine was designed for can actually degrade an engine's performance and even leave deposits behind. Really.
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Old 09-11-2012, 07:35 PM   #6
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Quote:
Originally Posted by Jerry Bransford
Running a higher octane than the engine was designed for does literally nothing for performance. In fact, since higher octane fuels burn slower and are harder to ignite than lower octanes, running a higher octane than the engine was designed for can actually degrade an engine's performance and even leave deposits behind. Really.
I am assuming the diablo thing mentioned is a tuner, jerry. That is probably why he mentioned a higher octane fuel.
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Old 09-11-2012, 08:44 PM   #7
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Sorry to hijack but I'm pretty sure we killed the V-8 vs I6 question. What about these programmers? Do any of them actually work? And by work I don't mean five to ten hp, I mean like seat of the pants hp that you can actually feel.
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Old 09-11-2012, 09:18 PM   #8
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The Diablosport that came witb my Ripp supercharger really works great.

I will say the Superchip flashpak I bought when I first got my Jeep was worthless.
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Old 09-12-2012, 07:34 PM   #9
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I ment I6 when i said V6. Also i allredy have a 4.0 that i like was just wondering how bad the 8 would be.
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Old 09-12-2012, 08:49 PM   #10
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That would depend a lot on which V8 you swapped in. Most of the GM LS series motors get very good gas mileage. My 4.8L LS truck engine managed 21 to 22 on the hwy day in and day out, in a full sized truck. They're probably the easiest to manage from a wiring stand point and the ecm's have been wrung out pretty well, so would be easy to flash for your needs.

Transmission choices are also good, along with transfer cases that are used by Chevy/GM.

Can't tell you about Ford or Dodge, as I haven't owned one of those since the days of carburetors.
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Old 09-12-2012, 09:15 PM   #11
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Quote:
Originally Posted by Jerry Bransford
Running a higher octane than the engine was designed for does literally nothing for performance. In fact, since higher octane fuels burn slower and are harder to ignite than lower octanes, running a higher octane than the engine was designed for can actually degrade an engine's performance and even leave deposits behind. Really.
Accidentally filled my tank up with premium once, and I may have been imagining it but I thought it felt a little sluggish.
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Old 09-12-2012, 10:00 PM   #12
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Quote:
Originally Posted by Cons_Table View Post
I am assuming the diablo thing mentioned is a tuner, jerry. That is probably why he mentioned a higher octane fuel.
Last time I checked tuners didn't increase compression ratio.

Quote:
Originally Posted by DPD06 View Post
The Diablosport that came witb my Ripp supercharger really works great.

I will say the Superchip flashpak I bought when I first got my Jeep was worthless.
Big difference between a tuner paired with a supercharger and just a plain tuner.
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Old 09-12-2012, 10:15 PM   #13
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The Diablosport that came witb my Ripp supercharger really works great.

I will say the Superchip flashpak I bought when I first got my Jeep was worthless.

You supercharged the I6? If so that woke up the jeep. The tuner change the fuel mixture.
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Old 09-12-2012, 10:35 PM   #14
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Quote:
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Last time I checked tuners didn't increase compression ratio.
No, but they allow you to change the timing points along with the A/F ratio to create more power. This has been proven countless times on the dyno. Although in fairness, there aren't many people on this forum worried about how to best go a quarter mile on tarmac.
That's more for RWD V8 2 door cars.
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Old 09-12-2012, 10:44 PM   #15
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Quote:
Originally Posted by Bronek

No, but they allow you to change the timing points along with the A/F ratio to create more power. This has been proven countless times on the dyno. Although in fairness, there aren't many people on this forum worried about how to best go a quarter mile on tarmac.
That's more for RWD V8 2 door cars.
That's why I asked the way I did. Many things have been proven on the dyno but I want seat of the pants hp. And no I don't think anyone is looking for the best quarter mile time but a little torque never hurt.
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Old 09-15-2012, 09:40 AM   #16
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Originally Posted by kyjeep View Post
That's why I asked the way I did. Many things have been proven on the dyno but I want seat of the pants hp. And no I don't think anyone is looking for the best quarter mile time but a little torque never hurt.
When tuners advance the timing, they slightly help high RPM HP but they do nothing for low-end torque.
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Old 09-15-2012, 01:18 PM   #17
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Also, if I remember correctly, tuners can only change timing/AF ratios at WOT.

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