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  #13  
Old 07-13-2012, 08:48 PM
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Re: Ready for some tuning? Look here!

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Originally Posted by JTS97Z28 View Post
Well maybe the way I explained it came off harsh. My Jeep drives perfectly fine, its just that I personally am not happy with the shift points. Why they would design this thing to shift so early just ruins the driving experience for me. And besides I don't see how bogging the engine can help improve economy. So I wasn't saying my Jeep had a lack of power because it doesnt, it goes just fine if I make it, but during economy minded driving it simply has annoyingly bad shift points.
So in other words in your experience, the lighter your foot, the earlier it shifts and more poorly chosen the shift point?
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Old 07-13-2012, 09:13 PM
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Re: Ready for some tuning? Look here!

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Originally Posted by JeepersCreepers View Post
So in other words in your experience, the lighter your foot, the earlier it shifts and more poorly chosen the shift point?
Yes I would say that's a good description of how it feels my jeep drives. For example there is this intersection that I go through everyday going to work. It's a right turn with a slight incline that starts as you are turning. Every day my jeep does the same thing where it will shift into 2nd or 3rd (can't remember which) and will literally big itself at like 1100rpm while I'm trying to accelerate up an incline with cars behind me. Then I either gotta push the pedal down to atleast 50%+ to get it to kick down or I use the autostick to do it myself. And then there are days when I drive my wife's Honda and it shifts at perfect times everytime. Just annoyances like that I wish I could fix.
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Old 07-13-2012, 09:33 PM
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Re: Ready for some tuning? Look here!

I know what you mean. Have you tried sport mode and the tow/haul button? That helps.
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Old 07-13-2012, 10:02 PM
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Re: Ready for some tuning? Look here!

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Originally Posted by JTS97Z28 View Post
Yes I would say that's a good description of how it feels my jeep drives. For example there is this intersection that I go through everyday going to work. It's a right turn with a slight incline that starts as you are turning. Every day my jeep does the same thing where it will shift into 2nd or 3rd (can't remember which) and will literally big itself at like 1100rpm while I'm trying to accelerate up an incline with cars behind me. Then I either gotta push the pedal down to atleast 50%+ to get it to kick down or I use the autostick to do it myself. And then there are days when I drive my wife's Honda and it shifts at perfect times everytime. Just annoyances like that I wish I could fix.
Does that happen if you take the same turn but while pressing down further on the gas pedal (before it drops to 1K RPM)?

I agree that it does seem fuel-inefficient to force you to give it more gas when it shifts too early and it bogs down at 1K RPM, so I do hope Jeep comes out with a TSB for that as at this point I plan on buying a WK2 in a couple months (and it probably won't have Selec-Terrain).

One other thing, I know that the transmission apparently "learns": have you tried resetting its memory to see if that maybe improves things?
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Old 07-13-2012, 10:09 PM
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Re: Ready for some tuning? Look here!

how do you reset the trans memory?
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  #18  
Old 07-13-2012, 10:20 PM
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Re: Ready for some tuning? Look here!

Why do you usually get better mileage with a CAI then?

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Originally Posted by FAUEE View Post
You're confusing a few concepts here into one big concept.

What he's saying is right, a warmed up engine is more efficient, and engines have operating temperatures they're designed for, and use more fuel until they reach that temperature. Lowering the temperature the engine is trying to run at may put it out of balance, and reduce efficiency.

What you're thinking of is the temperature of intake air. It's a common misconception that colder air is better always. Cooler air is denser, and thus, requires more gas to achieve the correct mixture. Where people get tripped up is that since the air is denser, and more gas is injected, you get more power. You're not getting more power from the air, you're getting more power because you're injecting more gas in to offset the extra air.

Truthfully, a hot air intake is better for fuel economy, as hot air is less dense, and thus less gas is injected for combustion. Less gas injected = higher fuel economy.
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Old 07-14-2012, 07:46 AM
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Re: Ready for some tuning? Look here!

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Why do you usually get better mileage with a CAI then?
Can't say I have ever seen anyone get better fuel economy after installing a CAI.



As for the other question I was asked....i have not reset the computer although I have thought about that. Might be worth a shot because under normal driving I do tend to baby the car. As for more throttle going in the turn, I think that actually makes it worse unless I do a LOT of throttle. But under normal throttle it will try to accelerate up an incline at 1100rpm unless I do something about it.
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Old 07-14-2012, 09:40 AM
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Re: Ready for some tuning? Look here!

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Why do you usually get better mileage with a CAI then?
You don't. The only times you could potentially get better fuel economy from a CAI is 2 reasons.

1) Your CAI is actually a HAI, has a big metal pipe and is actually causing the intake air to be hotter than the OEM setup.

or

2) Your vehicle is underpowered, and the additional power allows the vehicle to move without stressing the engine as badly. Nowdays this is fairly rare, but it does happen when manufacturers want to claim very high fuel economy numbers (GM has had quite a few of these in the past years).
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Old 07-14-2012, 04:42 PM
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Re: Ready for some tuning? Look here!

Not really looking for better fuel economy nor make it run below design. Just if the thermostat is designed to open at 195, I do not want it running over 200F on a 70F day.

Similarly I do not want the intake temperature running over 100F (is typ 115-135F & have seen a lot hotter). True, the plastic is a btter insulator than metal but see no purpose in the furnace section over the exhaust side of the head. Factory plastic "hose" has a lot more surface area in hot places than a metal pipe does.

I live in a hot climate and have found that running engines cool (typ 180-190F) and keeping the intake at 100F results in the best MPG and everything under the hood lasts longer.

What no-one has explained is how the coolant can be 206-210F and the oil temp is reading 188-192F.
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Old 07-14-2012, 05:36 PM
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Re: Ready for some tuning? Look here!

Sensors are in different areas of the block? Oil does not get as hot as not much of it is flowing through the head? I dunno, but running a lower coolant temp will effect emissions a lot, contributing to global warming, and making your climate even hotter .

I think you are worried about a non-issue. Heat doesn't degrade todays components, (unless you set them on fire) especially now that nothing is made of rubber. I recall years ago having to replace radiator hoses every couple years, but over the last 15 years or so after synthetics have taken over, never. Belts only wear out, they no longer age... The only reason to play with the intake are temp is to fool the computer into providing a slightly richer mixture, which certainly does not improve mpg.
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Old 07-14-2012, 08:24 PM
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Re: Ready for some tuning? Look here!

No, my purpose is to start further down the PV curve to lessen the odds of detonation on trash gas. Again, I am not talking about cooler per se as keeping it on the lower end of the design points. It has a 195 thermostat so if I can lock it under 200F I'll be happy. IAT is designed to be all in by 100F so no reason to let it go higher. Florida has a different climate than Michigan (really do not need heated mirrors).

Golbal warming ? Thought that was no longer a buzzword. Baby seals now...
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Old 07-15-2012, 01:47 PM
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Re: Ready for some tuning? Look here!

If contacted B&G about a tune via phone and email with no success.
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