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Old 08-14-2006, 09:02 PM   #1
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Just got a '99... have a few questions...

hello all! I am a new owner of a 99 TJ. I just made my switch from my 95 lifted XJ... it was hard to part with her, but I have always wanted a wrangler and this one came along for the right price.
on to my questions. here are my stats: has the I4 (a step down from my I6 in the XJ), it has a skyjacker suspension lift (guessing 3"), also has 2" body lift, wide fender flares, intimidator air filter (a k&n knockoff?), quick disco's, onboard air, electric fan on radiator, and some other extras.

The engine seems to have a decent amount of power to it now, but I am wondering where I can go from here...
The tires that came on the jeep were 265/75/15. I figure these are about 30's. They look very small on the Jeep and are on some aftermarket AR rims. The spare on the back is a full size 33x12.50. I am assuming that the previous owner had 33x12.50's on it. Would the 33's fit on this size lift ok? Does anybody run this similar setup (with 33's) that I could take a look at some pics? the room under the flares looks like it would easily fit the 33's. Also, is the I4 engine going to struggle to turn these size tires? Should I worry about re-gearing? Are there are any simple engine mods that i can do to gain some more power?

If there are any tips or suggestions any of you have that will help me extend the life of my TJ, I would greatly appreciate it.

Thanks again, and I appreciate all the info that everyone shares here in the forum!

Jeff

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Old 08-14-2006, 09:41 PM   #2
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yes. not me. yes. yes. not much.

Oh yes, and welcome aboard. Not everyone on the forum is a smart a** like me.

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Old 08-14-2006, 09:53 PM   #3
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Okay, loosen up guys, before you rip me a new one. I was just in one of those moods. My feeble attempt at humor probably shouldn't have been directed at a newbie to the forum. There are some knowlegable guys on the forum who will be more than glad to steer you in the right direction.
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Old 08-14-2006, 09:53 PM   #4
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nah i think those are 32's on your jeep...but that is very small to have a 5 inch lift...if it has 5 inches of lift then the 33's will fit with plenty of room and fit absolutely fine...you will be fine even if it only has a 4 inch lift...and a bunch of people run 33's with only a 3 inch lift...it rubs at full flex but not a huge deal...and if you have 5 inches of lift then you can even fit 35's...if you run 35's then you will DEFINITELY want to regear...and as far as 33's go yes it would defnitely help to regear as it will help a lot with regaining lost power but you don't have to...although it would be very good to since you have the 4 banger...if you put the 33's on just see if it struggles or not and determine if you need them...i think that you will probably need them with a 4 banger considering 33's takes some power away even from the 6 banger and people regear with the 6...and as far as other performance mods...throttle body spacer, air filter, high flow cat, cat back exhaust, headers, computer chip, programmer
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Old 08-15-2006, 07:27 AM   #5
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Thanks for the replies guys. I do have another question... Does the TJ usually run with a higher oil pressure? I am always between 45 and 60 on the guage, and sometimes it sweeps along with acceleration. Is this normal?
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Old 08-15-2006, 07:41 AM   #6
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If the previous owner did that much work on the Jeep, maybe it's already been re-geared?
4-cyls come with 4.10's, which is what I'm running in my I-6 TJ wih 32's and it's about perfect. Granted, the 6 and the 4 have different power bands, but they're pretty close I think. I know other people who run 33 and even 35's with the 4 banger and they don't seem to mind. I'd say drive it awhile and then decide.
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Old 08-15-2006, 07:43 AM   #7
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I get nervous when I see that kinda thing.

I've neveer had it happen in a Jeep, but I had the same problem in my old 76 Stingray and in my 68 Firebird 400. Both times it was the oil pressure sending unit. The firebird only had a dummy light. It was humorous to watch it go on and off. Almost trippy. I didn't figure out what was wrong till I installed a real oil gauge.

If this ends up being the case, its not a difficult fix.

I've had jeep guys tell me that its not a big deal, as long as the oil level is correct. I'd rather know exactly what my engine is doing.
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Old 08-15-2006, 01:45 PM   #8
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Oil pressure is a function of rpm, since the oil pump turns proportional to rpm.

There is a bypass valve that above a certain pressure, ports extra oil directly back to the oil pan.

On dead cold start, you should see high oil pressure (40# or higher) even at idle. As the oil heats up, the pressure will drop. You should see at least 15# on a tight engine at idle fully hot. 7or8# is the absolute minimum.

With the engine at "room" temperature (50-90 degrees or so; don't do this at -40 degrees in other words), slowly increase the engine speed from idle to 2500rpm. You should see the pressure increase from a minimum of 15# (more likely 30#) at idle up to 45# or so (usually that's about the bypass setting) by 1500rpm, then stay constant above that.

When the engine is fully hot, you may see 15# at idle, and it will increase and hit 45# at maybe 2000rpm indicating it takes more rpm to produce the same pressure with hot (thin) oil.

Unless an engine is really worn, at some reasonable rpm (2500 or so) you will achieve maximum pressure when the bypass valve is open hot or cold. Note that with VERY thick or very cold oil, it IS possible to exceed the bypass valve oil pressure since the oil is just too thick to bypass enough through the return passages to lower the pressure all the way to its calibrated pressure.

This also depends upon what type (dinosaur or synthetic) and viscosity (10W30, 20W50, or straight 30 weight, for instance). A 20W50 will not thin out as much at high temperature, so you will experience less pressure drop with high temperatures.

The oil pressure in a TJ is "smoothed" meaning time averaged, so the readings are damped, or delayed somewhat. If you install a mechanical gauge, oil pressure changes instataneously with rpm, not smoothly.

Bob




Quote:
Originally Posted by TJeffro
Thanks for the replies guys. I do have another question... Does the TJ usually run with a higher oil pressure? I am always between 45 and 60 on the guage, and sometimes it sweeps along with acceleration. Is this normal?

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