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Old 08-26-2014, 08:35 PM   #1
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Tuner?

Wanting to know if there is any kind of tuner that work and give better mpg and maybe performance for my 99 tj sport

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Old 08-26-2014, 08:41 PM   #2
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No.

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Old 08-26-2014, 11:12 PM   #3
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Which one.
MPG or performance?
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Old 08-27-2014, 05:26 AM   #4
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Which one.
MPG or performance?
I was thinking one of the tuners with different settings
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Old 08-27-2014, 06:24 AM   #5
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A tuner IS NOT going to provide much if any gains on the TJ motors. (does work on other applications but not here)
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Old 08-27-2014, 07:58 AM   #6
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Our Jeep TJs use 'old' tech. Newer engines can be 'tuned' because of their DOHCs and/or VVT coupled with their engine computer units that make our engines look like sticks in the mud.
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Old 08-27-2014, 08:02 AM   #7
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I've also been curious on this...but I would like a tuner that doesnt have predetermined tunes on them, those things are junk. I prefer going in and being able to write the program on my own.
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Old 08-27-2014, 09:41 AM   #8
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Originally Posted by Fuzzra99 View Post
Our Jeep TJs use 'old' tech. Newer engines can be 'tuned' because of their DOHCs and/or VVT coupled with their engine computer units that make our engines look like sticks in the mud.
It does not take "DOHCs and/or VVT" to tune an engine system. Any computer controlled engine (provided the correct program and interface) can be tuned.
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Old 08-27-2014, 10:05 AM   #9
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You can "tune" a TJ if you're so inclined, but most likely the gains will be negligible on a stock setup. Gas engines are much more air/fuel ratio dependant for performance and with the 4.0 already getting enough air, there isn't much you can do that doesn't include the words supercharger, turbo, or engine swap.
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Old 08-27-2014, 10:49 AM   #10
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You can "tune" a TJ if you're so inclined, but most likely the gains will be negligible on a stock setup. Gas engines are much more air/fuel ratio dependant for performance and with the 4.0 already getting enough air, there isn't much you can do that doesn't include the words supercharger, turbo, or engine swap.
If you have a proper tuner there is actually quite a bit you can do for mpg that does not negatively impact performance.

We pulled 29mpg out of my buddies stock Sonoma, and he still gets 29-30mpg with bolt ons now as well.

Same thing goes for my LS1, when it was stock I was getting 30mpg highway, now I've added stuff but haven't retuned to compensate.

You would be amazed at what you can do by adjusting spark tables, reworking DFCO (decel fuel cut offs), and adjusting your AFR.

For performance, I am willing to bet that these things go much richer than they need to be at full throttle...Every car I have tuned is set like that from factory...they do it as a safety so that people who dont maintain their vehicles are still less likely to do damage to the motor when going full throttle.

Lean the car out and you'll get more power and better mpg ... 13.0-13.3 AFR is what you should run WOT...I bet if someone threw an AFR gauge on these jeeps it would likely be down in the 11's like every other vehicle does from factory
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Old 08-27-2014, 11:32 AM   #11
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You certainly have more experience in the finer points so I'll take your word for it. I was assuming the OP was looking more for a plug-in, upload and go type tuner.

And I'd still bet the gains on the 4.0 wouldn't end up being worth the hassle, unless you're as stubborn as I am.
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Old 08-27-2014, 11:42 AM   #12
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I think he was looking for plug and play but I agree the plug and play types are terrible. Every vehicle is different and needs to be tuned accordingly. Way too many factors come into play.

Unless there is something out there that allows you access to all the fueling maps, spark tables, fuel cuts, and every single parameter that triggers things like Power enrichment, fuel adders, transient enrichments etc, it's not worth the time or money...you won't gain anything worth bragging about.

Of course, when you have access to all of those systems you are also laughing for a lot of reasons lol, but I won't get into that.

and ya, it was really funny actually...we got him better mileage out of his 4.3L v6 truck than he was getting in his Honda Prelude hahahah
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Old 08-27-2014, 03:31 PM   #13
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Yeah I was mainly looking for mpg since I have 31s and I'm planing on a 2.5 inch lift I just don't want 10mpg....also for performance I might get new plugs....the jeep runs great I just wandered if there was any way to gain a few more hp and torque ( also I have noticed that changing spark plugs helps alot even when you can't notice a power difference
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Old 08-27-2014, 04:11 PM   #14
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plugs wont make a noticeable difference on their own unless you are in dire need of them.

But the little things do add up. If you do plugs, try indexing them as well as side gapping them.
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Old 08-27-2014, 05:26 PM   #15
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Originally Posted by Letzride View Post
plugs wont make a noticeable difference on their own unless you are in dire need of them.

But the little things do add up. If you do plugs, try indexing them as well as side gapping them.
Is that adjusting the distance on the plugs? ( sorry rookie question )
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Old 08-27-2014, 07:49 PM   #16
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Is that adjusting the distance on the plugs? ( sorry rookie question )
No worries...you learn on forums- Indexing them is when you place the open side of the gap so that it is facing the opening of the intake valve.

Side gapping is something I have been reading into and would like to do, but essentially you are cutting back the top of the plug and then gapping the angle to the electrode so that more of the spark area is exposed to the mixture for a more complete combustion. It goes hand in hand with indexing the plugs.

More complete combustion = more power per cylinder
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Old 08-27-2014, 10:06 PM   #17
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Originally Posted by Letzride View Post

No worries...you learn on forums- Indexing them is when you place the open side of the gap so that it is facing the opening of the intake valve.

Side gapping is something I have been reading into and would like to do, but essentially you are cutting back the top of the plug and then gapping the angle to the electrode so that more of the spark area is exposed to the mixture for a more complete combustion. It goes hand in hand with indexing the plugs.

More complete combustion = more power per cylinder
Thanx
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Old 08-27-2014, 10:40 PM   #18
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I've also been curious on this...but I would like a tuner that doesnt have predetermined tunes on them, those things are junk. I prefer going in and being able to write the program on my own.
Why? I've tuned hundreds of vehicles and with 100% stock parts, the canned tunes work decent. I custom tune any vehicle with aftermarket parts.

Quote:
Originally Posted by Fuzzra99 View Post
Our Jeep TJs use 'old' tech. Newer engines can be 'tuned' because of their DOHCs and/or VVT coupled with their engine computer units that make our engines look like sticks in the mud.
yeah, they do look like sticks in the mud compared to independent adjustable intake and valve timing.
Quote:
Originally Posted by Letzride View Post
If you have a proper tuner there is actually quite a bit you can do for mpg that does not negatively impact performance.

For performance, I am willing to bet that these things go much richer than they need to be at full throttle...Every car I have tuned is set like that from factory...they do it as a safety so that people who dont maintain their vehicles are still less likely to do damage to the motor when going full throttle.
I know for a fact that the 05-06 jeeps run closed loop WOT for the first 25 seconds before they get into PE. You can tune this out and make some power. I haven't bothered doing it on my dyno even though I have the ability to do it for free. There may be some small gains from fuel cutoff on the 05- 06s compared to the older wranglers because they have much higher cutoffs to get into coasting fuel shutoff
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Old 08-27-2014, 10:59 PM   #19
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Why? I've tuned hundreds of vehicles and with 100% stock parts, the canned tunes work decent. I custom tune any vehicle with aftermarket parts.

Canned tunes are just that - canned and generic. lots of things play a factor in why they aren't good. Different density altitudes, different maintenance of the vehicle, etc.

Think about it, if you live in Denver where DA could be 12000 to 15000 and I live over here where in the colder months we're minus 2000 DA, that impacts fueling.

Yes, your pcm will adjust, but what is ideal for you is not ideal for me.

Every motor is different, maintenance from 1 rig to another can affect a lot of things. Will it run? yes, but you are paying to optimize something and you definitely aren't optimizing it with a canned tune.

Plus, canned tunes tend to change the bare minimums so as to maintain safeness of the tune because they know it has to be able to be safe in multiple conditions for multiple users. I compared my old canned tune to my custom one...big difference (in the Camaro)

Quote:
I know for a fact that the 05-06 jeeps run closed loop WOT for the first 25 seconds before they get into PE. You can tune this out and make some power. I haven't bothered doing it on my dyno even though I have the ability to do it for free. There may be some small gains from fuel cutoff on the 05- 06s compared to the older wranglers because they have much higher cutoffs to get into coasting fuel shutoff
I can't really speak on this without seeing the tuning software and the entire program for jeeps. A lot comes into play and there are reasons for everything. I'd be more inclined to know at what TPS is PE enabled, what is the command AFR across the RPM range and is there a delay entering PE?

Then I'd want to look at what engine temps correlate to that as well as a number of other factors.

Then I'd love to see how much KR these things get from factory, because cleaning up the timing for that alone will do wonders.

There is a lot at play with pcms, they are complicated intricate little programs

Factory tunes are not as clean as you think, and jeep being as unrefined as it is, I suspect will be no different than the cars I've touched.

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