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how to increase towing performance


 
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bulldogxj
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Joined: 16 Jun 2006
Location: charleston, sc

PostPosted: Sat Jun 17, 2006 3:29 am    Post subject: how to increase towing performance Reply with quote

I would like to make the following upgrades with the intent of improving my stock 97 manual 4x4's towing performance (3000# trailer with brakes):
heavy duty leaf springs
headers and performance exhaust (no idea what brand)
3 loop radiator
cold air intake
throtte body

30-40 additional HP while keeping it cool is the goal. Would a rear dif cooler be a good idea? Please let me know if any of the above are suspect or if you have additional ideas.

Also, my clutch is heading south and I'm wondering if it would be better to proactively replace it or just let go completely (it has about 65km)? I intend on replacing it with a heavy duty clutch.
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monkeyman3875
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Joined: 06 Jul 2005
Location: Charlotte, NC

PostPosted: Sun Jun 18, 2006 7:46 pm    Post subject: Reply with quote

The stuff you have listed sound like a good start (not sure about the diff. cooler). Be very careful towing something that heavy, especially if going up and down mountains.

Pretty much any improvement to HP will help you out.

Transmission: THIS will be your biggest problem. With something that heavy, your transmission is probably the first thing to go (more so with clutch trouble). Depending on where you plan on towing (mountain v. plains) deffinately think about replacing the clutch first.

Also consider a load leveler (if tounge weight aproaches 400+lbs.). Your jeep can handle up to 500lb. tounge weight (I think) but I wouldn't push it.
_________________
-1997 Stock XJ
-4.0 L
-4-speed automatic
-130k Miles (and counting)-> let me know of any preventative maintenance you guys can think of. PM me.
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bulldogxj
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Joined: 16 Jun 2006
Location: charleston, sc

PostPosted: Mon Jun 19, 2006 5:48 am    Post subject: Reply with quote

Thanks for the confirmation. Not too many mountains down in here in Charleston (just that new bridge). Although I do hear what you are saying. I'm hoping to be able to tow this trailer down to S. Florida occasionally (once per year). Again thanks for the reply.
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RockOn
Member


Joined: 04 Mar 2006
Location: Murfreesboro, TN

PostPosted: Mon Jun 19, 2006 6:42 pm    Post subject: Reply with quote

Well I can tell you about K&N filters that may help you.

I got a K&N cone filter & a large hose clamp. I removed the old air cleaner box and tossed it into the trash. I slippped the K&N into the factory flutted, rubber hose coming from the intake. I tightened the hose clamp around the factory intake hose to hold the snuggly fit K&N filter together.

I did notice afterwards the engine was sucking air in better. The rpm's did ramp up faster.

I do have an after market muffler, it helps a little. It would probably help more if I had a header & complete exhaust system installed. But for me, I can't justify $$$ for a couple of horses.

I personally do not want to try to reengineer the motor. I figure after I blow my motor I will drop a crate 350 into mine. I like the less horse power/dependable motor myself.

Althought!!! alot of peeps don't feel the same way I do & thats cool.

Now I will preach gears & lockers are the sheet! I have found there is the best bang for the buck!

Hope this helps a little....
_________________
89 or 90? XJ
http://i42.photobucket.com/albums/e330/Tahkesis/
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mpetess10
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Joined: 03 Apr 2006

PostPosted: Mon Jun 19, 2006 7:24 pm    Post subject: Reply with quote

best thing you can do to improve your towing capabilities is to regear
3.55's or even better would be 3.73 gears would be your best bet
not to mention the fact that if you already know your clutch is showing signs of failure its almost deffinately gonna fail at the most inoppurtune time
aka when your a good bit away from home and towing

hp adders will help but your biggest problem is like mentioned the tranny and clutch
if you can reduce the strain put on those parts your less likely to have an issue
lower gears is the best way to reduce that strain

also keep in mind that XJ's braking system is considered MARGINAL for towing
the 5 spd tranny will help in your slowing abilities but you still need to pay attention to the brakes

better gears will also help with gear braking and help slow you down quicker when you downshift
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bulldogxj
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Joined: 16 Jun 2006
Location: charleston, sc

PostPosted: Thu Jun 22, 2006 2:15 pm    Post subject: Reply with quote

just got back into town. thanks for all the advise. re-gearing is something i'll certainly consider.
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