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Old 02-28-2011, 11:42 PM   #1
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Bear with me a moment . . . .

So back when I was young and foolish (8 months ago) I bought a "Stage 1 Jet Chip" for my Jeep. I put it in within a week of taking delivery and noticed nothing.

After spending some time here, I realized it was an expensive paperweight and took it out. As when I installed it, I noticed no change.

Six weeks ago, I started manually tracking my gas mileage. Every tank was within one tenth of 16.2 mpg. Always.

Two weeks ago, my wife pulled the chip out of a drawer and asked me whether I was ever going to put this (expensive) trinket back in the Jeep.

Fine. So I put it back in. As before, absolutely no change in the "butt dyno". However, the Jeep's computer started claiming another mpg. I had about a 3/4 tank of gas at the time.

At the next fill up, my manual calculation showed 17.14 mpg. I filled up again tonight, and got 17.58 mpg from the last tank.

There has been no change in driving habits, but it appears I'm suddenly getting nearly an extra mile and a half per gallon.

I'm pretty surprised by this and was not expecting it. Thoughts? Any explanation you can think of other than the chip?

(PS - I haven't done the math, but even if this is due to the chip, I would expect the cost of chip still means it was a bad purchase. I'm not advocating the chip, just sharing an observation that surprised me.)

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Old 03-01-2011, 12:35 AM   #2
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That is pretty interesting. I honestly don't know much about that chip, but maybe it is helping you out a little on the mileage.

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Old 03-01-2011, 01:40 AM   #3
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I have a JET stage 2 chip installed that was recommended to me when I got my Borla exhaust. I started at about 17.5 and am now in the 19.3 range, so I have to think it does something. Of course, I also changed the thermostat and air filter as recommended by Borla also, so maybe its a combination of things doing it. The chip is a little pricey, though (mine was $230 USD).
Sorry the pic is a bit blurry - it's dark in the garage and it's a tough angle to get a shot of it...
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Old 03-01-2011, 01:57 AM   #4
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no change in torque or engine strength?? what does it or supposed to do??
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Old 03-01-2011, 02:07 AM   #5
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From the Jet site -
"The JET Performance Module for Dodge, Chrysler and Jeep vehicles is a JET exclusive. Dynamic Spectrum Tuning provides power gains across the entire power band-not just at full throttle. Point by point air/fuel ratio, ignition advance and various other tuning points provide performance gains of up to 25 horsepower. Improves throttle response, acceleration and low end torque.
Stage 2-Designed for the performance enthusiast, the Stage 2 features more aggressive programming to make the most horsepower and torque available. Fuel and timing curves are extensively modified for peak performance and drivability. Requires use of 91 octane fuel, 180 degree thermostat and free flow exhaust. Also works well with aftermarket intake systems, mass air sensors, TBI spacers, etc."
JET Performance Products, Import & Domestic Performance, Performance Kits, Fuel Systems, Transmissions
They also have an air/fuel monitor if you really want to get mpg conscious...
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Old 03-01-2011, 02:26 AM   #6
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Im pretty sure that these different chips that are available help control the shift points for automatic vehicles. Which means that there will be little or no difference in power and acceleration on manual vehicles .
Congrats on the mpg gain, that makes it worth it in my books.
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Old 03-01-2011, 09:57 AM   #7
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Originally Posted by AdrenalineJunky45
no change in torque or engine strength?? what does it or supposed to do??
No, no discernible change in torque/power.

For the most part, performance chips are junk, particularly for the 3.8 in our Jeeps. The two exceptions I am aware of are (a) as another poster observed, those that reset the shift points for auto transmissions to give a "sportier" ride, and (b) programmers like the AEV ProCal that can adjust your speedometer and the like to account for bigger tires. I have a manual transmission and stock tires.

Anything that claims it's going to generate all kinds of new torque/power etc is full of BS in my opinion. You need a supercharger for that. Call RIPP.

Of course, I didn't know that was going to be my opinion 8 months ago when I shelled out $200+ for this goofy chip.

So I'm pleasantly surprised to find that it's apparently generating a nearly 9% increase in fuel economy. Still, I wouldn't recommend anyone run out and purchase one without thinking long and hard about how long it will take to "pay for itself".

I've already bought it, so it's just nice to see it's not a total waste of money. I'll post in this thread again over the next few weeks if I discover the mpg going back down--it's possible the computer could learn it's way around the chip.
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Old 03-01-2011, 10:06 AM   #8
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thanks for the write up.....

while I'd like to think benefits as advertised occur, it's hard to believe the OEM wouldn't put such in the rig to begin with if they were of any real advantage for their product.

There's a trade-off somewhere in any performance gizmo claim. Long ago I had my fill of various $$ wasted on hopes for real improvement in my own rigs. I could make 'em noisier, less reliable, more prone to a wide variety of needless unforeseen vulnerability, or I could put that money on some other project....such as paying the rig off in the first place.
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Old 03-01-2011, 10:36 AM   #9
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Very well put presentation on the "CHIP" pros/cons-You toldit like itis and showed a reality check for any prospective buyer

I've told about the use of my jeep, so gas mileage isn't important to me and is mainly governed by your DRIVING HABITS !!

My modified JKU gets 17 mpg-ON LEVEL FREEWAY and I use the AEV ProCal Module, so we're all in the same game, just some deeper than others-

Thanx MTH fot the logical presentation !!

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Old 03-01-2011, 10:46 AM   #10
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Originally Posted by JeeperJake View Post
thanks for the write up.....
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Originally Posted by JIMBOX View Post
Thanx MTH fot the logical presentation !!
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Old 03-01-2011, 04:29 PM   #11
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Last post on this from me unless I see a change in the mpgs worth reporting.

I did "the math" to roughly figure out when this particular chip would actually be a "worthwhile" investment. I've assumed a per gallon cost of $3.50, that my results will not deteriorate, and (to JeeperJake's point) that there are no other adverse consequences from the chip.

At $3.50 per gallon, my per mile cost with the chip (17.58 mpg) is about 20 cents. Without the chip (16.2 mpg), it's about 22 cents.

Therefore, over the course of 13000 miles, I will have spent $2860 on gas without a chip, but only $2600 with a chip. That's a difference of $260, which is the MSRP of the chip. (See here.)

Carrying that a step further, I have a 22.5 gallon gas tank. With the chip (17.58 mpg), this means I can go about 396 miles per tank. Without the chip (16.2 mpg), that will drop by just over 30 miles to about 365 miles per tank. Therefore, to cover 13000 miles, it'll take almost 33 tanks with the chip, and almost 36 tanks without it.

So, this Jet Chip will "pay for itself" in about 13000 miles, or, put another way, after 36 (full) tanks of gas. This is more than a year's worth of driving for most folks. Of course, if you're paying more than $3.50 per gallon or can get the chip at a discount, it could pay for itself sooner.

Whatever the case, I'm now almost at 11000 miles, so I wish I'd left the friggin' thing in all this time . . . .
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Old 03-01-2011, 04:41 PM   #12
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Might be worth mentioning that the ambient temperature can make a difference in your mileage. Over the past year, my TJ (yeah, I know I'm in the JK form, I like to browse the new posts) ranges from about 19 mpg in Jul-Aug (having the top down helps, along with the warm weather) to 17 mpg in Jan-Feb. Just mentioning that there are a lot of other factors involved in your mpg. Stock TJ, 4.0, 5sp, stock Michelin LTXs.
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Old 03-01-2011, 04:48 PM   #13
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Quote:
Originally Posted by billyb View Post
Might be worth mentioning that the ambient temperature can make a difference in your mileage
Good point. For what it's worth, it's generally been cold over the course of my little experiment here.

Quote:
Originally Posted by billyb View Post
Just mentioning that there are a lot of other factors involved in your mpg.
Also a good point. I've by no means controlled for all variables or some such thing. I've just generally kept the same driving habits (same drive to work, etc.) and am drawing purely anecdotal conclusions. As I indicated earlier, however, I'm going to continue to track it and if my mileage begins to drop back down I'll post about it.
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Old 03-01-2011, 05:49 PM   #14
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MTH: I'd be interested to know the results. I bought the chip at a discount and have had it in the vehicle for a few months. While I was able to calculate some gain in mpg, I could not certify the claims in gain of horsepower they tout on the site. As Tyler pointed out, it could be better seen in an automatic transmission (although I've put similar devices in muscle cars and found noticeable hp differences when coupled with lots of other upgrades). Consistent throttling seems to be the biggest feature I've experienced along with the slight rise in mpg. As I was told by one of their tech reps, if you want big leaps in hp, they have a stage 3 chip, but requires 'substantial engine changes in order to gain the performance expected'... I suspect that would mean heads, jugs, rods, cams, turbo/super chargers, manifolds, gears... Basically a different vehicle.
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Old 03-02-2011, 07:42 AM   #15
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I have an 07 Jk, with minor engine upgrades, dual exhaust, air raid intake, throttle body spacer, accel wires, sythetic oils in all orifices. I do a substantial amount of city (Chicago area) driving and over the road, too. As a rule, I keep my stock 17" Goodyears at no less than 40psi, yea, I know they wear faster, but with 70,000 + miles on em, what the hay. Anyway, I am getting pretty much 17 mpg around town and at least 20 mpg on the road. I have been seriously thinking about a chip or programmer, but after reading the blogs about Jet, I will check out the others. Any advice on which others are better than Jet. Ps, I had a Jet in my 00 Jimmy S-10 4x4, lifted, big tires, auto, and I have to agree the results were disputable??
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Old 03-02-2011, 08:16 AM   #16
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Quote:
Originally Posted by jvass
I have been seriously thinking about a chip or programmer, but after reading the blogs about Jet, I will check out the others. Any advice on which others are better than Jet.
In my opinion, as I indicated in an earlier post above, if you have an auto transmission or have added larger tires then there are programmers that can help you. Otherwise, it's all junk. The the 3.8 is just about as "tuned" as it can be.

I was pleasantly surprised to see a mpg increase because I truly believed it did absolutely nothing. However, as I also indicated above, it would likely take more than a year just to break even. And that assumes the mpg increase stays, which it may not, and assumes I'm not injuring the engine in another way.

I'd save your money and buy something else.
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Old 03-03-2011, 08:32 PM   #17
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MTH: Given that the chip wouldn't do much for the motor with a manual tran, would the addition of the coil, wires, and plugs also yield negligible to no results on the 3.8L ?
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Old 03-03-2011, 09:44 PM   #18
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Originally Posted by trennmaschine
MTH: Given that the chip wouldn't do much for the motor with a manual tran, would the addition of the coil, wires, and plugs also yield negligible to no results on the 3.8L ?
I don't know--I've always heard "no," that only a supercharger can truly improve the performance of 3.8.

However, I have in fact had a mileage increase from the chip. I also did a post a while ago discussing that I did in fact see a modest--very modest--performance improvement from a CAI.

I also have a manual transmission, if it matters to you.

If you're curious, you could always take out your chip (or coil etc.) and see what happens. I think the important thing is just to remain as objective as possible. At the end of the day, whether you're happy with your mod choices or not, there will be other choices in the future--some will be better than others.
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Old 04-05-2011, 08:44 AM   #19
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My 2010 Mountain edition in Mnaual always gets 17.2 to 17.6 MPG. If I drive at 72 MPH on the interstate for 25 miles to work, I get closer to the 17.4 to 17.6. At 75 to 78 MPH, I get closer to 17.2. I check my mileage with every tank. Quirky habit, but I have done it ever since my first Jeep, an 88 Grand Wagoneer I still miss so much broke the fuel gauge, leaving me stranded. 4 times. SO I learned to calculate remaining gas and miles to next gas station constantly. Surprised as heck to see no real improvement to the overall picture. But then, I would offer the Jet chips at manufacturer at that cheap price. I have spent tons of money trying to get performance out of my 5.9 liter Grand . . .synthetics, K& N filter, high performance 3 inch exhaust . ..Jacobs electronic ignition . . .that kept burning out my ignition pack . . .swirly device for the intake . . .13 to 15 on a good day, downhill with a tail wind. All I ever got.
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Old 04-05-2011, 10:21 AM   #20
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I installed a stage 1 Jet module on my 2010 JK and it did run more crisply, my wife noticed the improvement as well. However, now there is no heat from the heater, even with the dial turned full on. AC works, though. Any thoughts?
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Old 04-05-2011, 07:33 PM   #21
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If something that may void your warranty and cause damage to your motor only nets you an mpg ( which in this case is 150$ a year savings) better economy and 10 or less hp ( which you will not notice ) can't be worth it to a logical person. The Op realized he made a bad purchase and is making a great post in his finds. He is saving money because of the chip but as he stated I'm sure he wouldn't buy it again. I believe it has become obvious on this forum that basic chips or tunes are really not worth the "performance" gains. They seem to have there up's with the auto's and opening up some features but I would not get a chip or tuner expecting more power or mpg. I would get one to able to unlock the computer a bit as they seem to provide some functions that we would want.

I did full high flow exhaust, bbk throttle body and cai on my one xj that only sees street and yes there was no doubt alot more power. These computer controlled to the max jk's not gonna happen short of a major upgrade.
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Old 04-05-2011, 09:24 PM   #22
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I have the Superchips Flashpaq and Ive seen no change in the performance, regardless of the setting. Any similar experience or am i using it wrong?
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Old 04-05-2011, 09:45 PM   #23
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I have the Superchips Flashpaq and Ive seen no change in the performance, regardless of the setting. Any similar experience or am i using it wrong?
Read my post again. You are on target.
What trans do you have?
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Old 04-06-2011, 11:20 PM   #24
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I don't know what formulation your gasoline is there, i.e. do they sell a winter gas in N.C.? Here, when late fall/early winter arrive, the fuel is changed (some ethanol added I think) and mileage sucks all winter. Even in late winter/early spring, when the temp comes up and mileage should otherwise be as good as summer, the crappy winter fuel will still give you a lower mpg by at least 1 to 2 mpg.

Maybe you are getting better fuel this time of year perhaps?
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Old 04-07-2011, 07:34 AM   #25
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Quote:
Originally Posted by Second Wind
Maybe you are getting better fuel this time of year perhaps?
Could be. Perhaps the very same weekend I put the chip back in, better fuel was made available.

The only issue I see with that possibility is that my computerized mileage readout literally began climbing minutes after I installed the chip, and my mileage (calculated by hand) in fact did improve for the rest of the same tank.

Still, I'm planning on pulling the chip out again once summer is here just to see if my mileage drops.

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