Hi all.
I'm almost at the buy a different car point.
Which saddens me. I've done a lot the my xj.
But I have recently started towing a small self built camper.
Weighs about 8or900 loaded. (560 licensed)
I'm struggling with upper end power. Especial inclines. Even medium ones. Often going down to 2nd to maintain speed.

I have rebuilt the motor. 20thou over, reseated valves etc. (same issue on the old motor)
New sports exhaust. (2.5")
Fuel pressures good. Regulators ok.
Injectors cleaned.
There is a new transmission in it now.
31's and regeared diffs to 4.11

I fail to see why a 4.0 petrol would struggle so much with such a small load.

Any suggestions?

 

31s and 4.11s that thing should rip!
what's the condition of your cats? Any noticeable lack of power without the trailer?

 

That thing is sail. Its not just about weight.

Buy a f150 . The xj wasnt desinged to tow a windsail

 

New exhaust.
Great power around town.
Still seems at 100ks there is not a lot left.

 

As Evan said, trailer design makes a huge difference. I used to tow my Bug which was probably a 3500-4000lb load total and my XJ did it no problem. I would borrow my brothers trailer that maybe weighed 1000lbs and it was a nightmare, completely empty. His trailer had a huge folding gate that acted as a parachute.