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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
i had a quick look in the write-up section but couldn't find anything in the first few pages.
what would be the best way to install some LED lights activated by a switch INSIDE my XJ? for example in the footwell area and the like. for wiring and installing the switch I'm fine, but what power source would be best to use?
It's just the speedometer gear. Changing tire size or gear ratio means you also need to change the speedo gear accordingly. Otherwise the speedometer and odometer will read too high or too low.
Originally Posted by 89Laredo
No. The transmission has an internal OSS for that.
Originally Posted by salad
Not to mention the shift points are largely based on throttle position and engine load anyway...
If running 35s on stock gears you've got more pressing matters than the speedometer lol
Something just isn't clicking for me...lol So on a more modern car you can adjust the tire size or pinion factor in the computer so if you go to a larger tire size or different gear ratio it knows to hold a gear for example if climbing a hill as it compensates for the reduction of torque at the tires(if larger). I noticed this on my ZJ when I went from 30's to 31's, there's a 45mph hill I take everyday and on the 30's it could shift to 4th and hold speed going up. Now on the 31's it would shift and then slow down downshift get to speed and shift again without adjusting the throttle position. Changing the speedo gear is the only way the computer can know you changed the drive ratio by changing tires? Or are the older systems just dumb and you have to deal with it?
i had a quick look in the write-up section but couldn't find anything in the first few pages.
what would be the best way to install some LED lights activated by a switch INSIDE my XJ? for example in the footwell area and the like. for wiring and installing the switch I'm fine, but what power source would be best to use?
although for my application I don't think I need it, what I mean by LED is really just a couple bulbs or strips that I'll place around the interior in order to get more light inside when needed (the bulb in the headliner doesn't do a really good job)
at first I thought I could use the current switch in the door that triggers the buzzer, but I would rather have a switch i can manually turn on/off when needed, I just don't know where to draw power (I guess looking at a diagram but even there I wouldn't really know what to do!)
thanks for the link, I'll keep that bookmarked. although for my application I don't think I need it, what I mean by LED is really just a couple bulbs or strips that I'll place around the interior in order to get more light inside when needed (the bulb in the headliner doesn't do a really good job) at first I thought I could use the current switch in the door that triggers the buzzer, but I would rather have a switch i can manually turn on/off when needed, I just don't know where to draw power (I guess looking at a diagram but even there I wouldn't really know what to do!)
Something just isn't clicking for me...lol So on a more modern car you can adjust the tire size or pinion factor in the computer so if you go to a larger tire size or different gear ratio it knows to hold a gear for example if climbing a hill as it compensates for the reduction of torque at the tires(if larger). I noticed this on my ZJ when I went from 30's to 31's, there's a 45mph hill I take everyday and on the 30's it could shift to 4th and hold speed going up. Now on the 31's it would shift and then slow down downshift get to speed and shift again without adjusting the throttle position. Changing the speedo gear is the only way the computer can know you changed the drive ratio by changing tires? Or are the older systems just dumb and you have to deal with it?
Thought we were talking about a cherokee. This thread /is/ in cherokee tech...
i had a quick look in the write-up section but couldn't find anything in the first few pages.
what would be the best way to install some LED lights activated by a switch INSIDE my XJ? for example in the footwell area and the like. for wiring and installing the switch I'm fine, but what power source would be best to use?
There should be factory wiring for footwell lights on your '96. Look above hood release and kick panel area for empty plug.
If you want independent lights with low draw, there is an accessory port in fuse box labeled ACC. It is switched power, only on when ignition is on. I use it to trigger relays.
am I on the right track? is what I highlighted where I would splice and pull my power from and use an inline fuse?
Originally Posted by SteveMongr
There should be factory wiring for footwell lights on your '96. Look above hood release and kick panel area for empty plug.
If you want independent lights with low draw, there is an accessory port in fuse box labeled ACC. It is switched power, only on when ignition is on. I use it to trigger relays.
the factory lighting will be triggered by the door though right? could this easily be modded to also use a switch or I should l go straight with your second suggestion? also where would I connect to access that power?
Originally Posted by SteveMongr
Replacing stock filament bulb with an LED will make a significant improvement.
yeah I should probably do that too, but I also want lights in the back and in dark spots like the footwell area when checking fuses or looking for dropped change!
have a 1995 xj and was wondering if the doors are interchangeable with doors from later models like a 1997-2001. don't like the little triangle window in the front on my 95.
have a 1995 xj and was wondering if the doors are interchangeable with doors from later models like a 1997-2001. don't like the little triangle window in the front on my 95.
Sorta, kinda. It's a somewhat common swap but the strike plate has to be moved. They do not just bolt up. (There's probably something else too as the hinges are different)
Something just isn't clicking for me...lol So on a more modern car you can adjust the tire size or pinion factor in the computer
Yeah, maybe on a new-fangled "hack me from my WiFi" technomobile. The only thing modern about XJs is that they have internal combustion lol.
(Also what is "pinion factor"?)
Originally Posted by rcguymike
so if you go to a larger tire size or different gear ratio it knows to hold a gear for example if climbing a hill as it compensates for the reduction of torque at the tires(if larger).
Noot quite. New TCM/TCUs might have that setting, but the basic decision is based on RPM, throttle position, and calculated engine load. (Engine load being a new thing, automatic transmissions existed long before computers). Road speed is irrelevant and doesn't change the internal gear ratios or how much power the engine makes.
Originally Posted by rcguymike
I noticed this on my ZJ when I went from 30's to 31's, there's a 45mph hill I take everyday and on the 30's it could shift to 4th and hold speed going up. Now on the 31's it would shift and then slow down downshift get to speed and shift again without adjusting the throttle position.
Absolutely. With larger tires there's a LOT more resistance to movement than otherwise. Overall RPM is lower and engine load goes up.
Originally Posted by rcguymike
Changing the speedo gear is the only way the computer can know you changed the drive ratio by changing tires? Or are the older systems just dumb and you have to deal with it?
The system doesn't care. The transmission programming is based on a power band. Change the axle ratio if you want different behaviour.
Sep 21, 2015, 03:49 PM
