Clogged cat???

 

Tires will make a difference in speed especially if its a 4 banger. i had a 2.5 " lift and 31 " tires and it struggled to hit 70 on a flat and uphill I was in 3rd sometimes.

 

I have 31s......... and ^^^^^^^^^ is OH SO true......

 

I can hit 75 with no problems no faster tho and hills drop me but no there is a problem the question is does it vibrate or something above 60

 

I have a small lift and 32's...2.5l, 63 tops on flat ground. However, not sure i would want a lifted jeep to hit 70+.....scary

 

Welcome to wranglers. My 95 has a lift and 32" tires, it can only hit 75 if I'm going downhill for a stretch on the interstate. Regular flat interstate driving I get up to 65 tops.

 

I have a 95 4.0 4" lift and 31s. I could drive 75+ if i wanted to on flat ground without a problem, but I'm not asking to die. I have 3.07 gears which definitely is hurting me for power but will hold u until I get a 8.8 to install. Also have a clogged cat which also needs to get fixed. Just my .02

 

I appreciate all the answers. I went to look at the Jeep, and it was way more work than I wanted to start with right off the bat. Too much frame repair, body rust, and leaks everywhere. This Jeep has been rode hard, and nobody took care of it. Thanks for helping, I am sure when I do purchase one of the few I am looking at, I will have more questions.

 

I agree with the 65 mph limit. Sounds like my 4 banger is running stronger though! I can hit 75 on a slight downward slope on the interstate and I have 33 x 12.5s! Roar! For those saying its a death trap... it runs smoother than most cars I have been in!

 

I have a 4 banger in my 91 and have 35 nitto mud grapplers and hit 70 easy! there is definitely something more going on with that jeep!

 

The real question here is,

"Is your speedometer accurate?"

Chances are, no, it is not. Speedometer accuracy changes depending on the age, the design, and the tire size. Everything is engineered to be accurate with factory components. Older YJ's have a mechanical speedometer setup with a cable and a spring inside of the gauge itself. Over time this spring gets worn out, so accuracy is altered, even with the factory 215/70/15 tire size (which is about 28"). I had 235/75/15 tires on my YJ (about 29.5" tall) and my speedometer was perfectly accurate on the money. My spring was worn out inside of the speedo itself. Newer YJ's with electronic speedometers do not have this issue.

Case in point, any change to the factory specified components alters the speedometer reading. 33's would throw it off quite a bit, so you might actually be going 75mph while the speedo only says 60mph. You need to verify with a GPS unit, preferably 2 separate ones (your phone, and a traditional GPS unit typically works well).

 

The real question here is,

"Is your speedometer accurate?"

X12! Mine is about 10 off

 

My 87 2.5 with 31's hits 70 easy and it will hold it in 5th gear on a slight rise,
somewhere along the line the cat and egr valve fell off so I'm sure that helped a little
sound nice too!

 

Hey.. a couple things.. I have a 93 YJ 2.5" lift 31" tires.. I eventually hit 65-70 mph.. How can I tell if my cat is clogged. ? Is there an easy way to tell?
And those speeds are thru GPS

 

How can I tell if my cat is clogged. ? Is there an easy way to tell?
And those speeds are thru GPS

After driving a little ways, hop out and look at the cat.. if it's glowing red, that's a good sign..

 

I had my cat clog a few years back and I couldn't go over 30 so not sure oher than lack of power tall tires and to big of gears will keep it above 60. My 95 YJ 4" 33" tires won't go above 70 but only in 4th gear. When I shift to fifth I slow down.

 

Speedo may be an issue. I am actually rethinking the purchase of this YJ, because the price is right, and other than cosmetics....it is a pretty solid ride. I appreciate all the help, it is making it a lot easier to know what to do with it once it is in my driveway. I will have to try the GPS idea...that is an awesome idea. And no, I do not have a death wish, the speed limit is 70 on our highways, and I want to be closer than 60.