speed limitation

[dutch kj]

Is there a speed limitation on a kj 3.7L .
At 180 km/u ,he is changed gear at that speed. (with kickdown)
But he is not going faster than that.
It feels that there is power enough.

 

[HoosierJeeper]

Yes. I believe it's there to preserve the ******.

 

[Ry' N Jen]

Must be a Dutch thing!
I'm sure all KJ's have a Governor fitted. I'm not sure at what maximum speed ours is set for. But I do know that I can accelerate well past 200 KMH. in ours!
Weather the speedometer is accurate at those speeds is another matter all together.

 

[jnaut]

Must be a Dutch thing!
I'm sure all KJ's have a Governor fitted. I'm not sure at what maximum speed ours is set for. But I do know that I can accelerate well past 200 KMH. in ours!
Weather the speedometer is accurate at those speeds is another matter all together.

Put in a GPS to verify speedometer accuracy.

 

[liberty84]

my 05 sport AT ******, will go 105mph and then bounce back to like 98 , (thats when it was stock, now I don't go past 70/75)

 

[Ry' N Jen]

Put in a GPS to verify speedometer accuracy.

Seeing I drive like an old man most of the time, I'm not particularly concerned with it.

 

[Dave]

I havn't driven mine fast enough to find out I guess.

Dave

 

[tjkj2002]

KJ's,at least '02-'04's,are limited to 114mph.A Jeep is scary at that speed,2-3mph in 4low is what a Jeep likes best.

 

[twack]

KJ's,at least '02-'04's,are limited to 114mph.A Jeep is scary at that speed,2-3mph in 4low is what a Jeep likes best.

I can confirm this, but you can hold it steady at 113mph without problems. But that was before the lift im not sure i want to try that again just yet

 

[Ry' N Jen]

KJ's,at least '02-'04's,are limited to 114mph.A Jeep is scary at that speed,2-3mph in 4low is what a Jeep likes best.

Seeing other people drive any Jeep model is scary!
My idiot sister amost rolled her TJ, 2 days after buying it!
"Oh, it certainly doesn't handle like my old MG Midget!"
BTW, MG Midgets don't handle unless you put lots of money into them!

 

[tjkj2002]

I can confirm this, but you can hold it steady at 113mph without problems. But that was before the lift im not sure i want to try that again just yet

Yeah I took mine to the limiter once,about 20mins after buying it.I always run to top speed in every vehicle I own at least once.The best so far was my '75 Cutlass after the built motor went in,since the speedo only went to 120mph by the math I topped out at about 180mph(give or take 5mph for math being wrong),not bad for a 5000lbs led sled and nothing like a big block singing at 7000rpm's through open headersleghump.gif

 

[jnaut]

KJ's,at least '02-'04's,are limited to 114mph.A Jeep is scary at that speed,2-3mph in 4low is what a Jeep likes best.

You know, I would never drive a KJ (or any suv, for that matter) at anything like that speed. But the fact that it's limited bothers me, bothers me somewhere inside. It offends me deeply and I'm not sure why.

Now, my 1979 280z? Hell yeas. Drove that summb**ch at 140mph across the Tularosa Basin. That was a frickin' sports car.

 

[HoosierJeeper]

Yeah I took mine to the limiter once,about 20mins after buying it.I always run to top speed in every vehicle I own at least once.The best so far was my '75 Cutlass after the built motor went in,since the speedo only went to 120mph by the math I topped out at about 180mph(give or take 5mph for math being wrong),not bad for a 5000lbs led sled and nothing like a big block singing at 7000rpm's through open headersleghump.gif

Just don't make them like they used to....

 

[tjkj2002]

Just don't make them like they used to....

And they never really did,I had to massage the 575HP out of that big block 350 that came from the factory with a measly 140HP.

 

[HoosierJeeper]

And they never really did,I had to massage the 575HP out of that big block 350 that came from the factory with a measly 140HP.

Yeah, I remember when all emissions stuff sucked the fun out.....

 

[moparman]

Speed limiters and tire speed ratings are usually similiar. Vehicle stability must be another factor. I have had my KJ up to an indicated 100 mph, it's not that fun.

 

[Powerslave]

I think it is more of a REV limiter as well. I have had mine past 105, recently in fact. It is really not to preserve the transmission, they can take 400+HP, and speeds well past what the limiter is. The limiter is there for safety, period.

I had a Dodge Avenger, I had that to 125, on a flat surface, 119 up a hill, and that's when a Durango beat me. I was revved out at 6200 in 3rd, and 4th would not get me up the hill, I was losing speed, so it would kick down again. Once I got to 6200rpm in 3rd, it would try and shift to 4th again, no go... The car fell flat on its face... SO, the Durango passed me going up the hill.. These KJs can go faster.

You can TRICK the speed and REV limiter with a circuit board that reduces the signal by 50%, though you would not need that much, but the circuit diagram and parts list I have is wired for that reduction.

A GPS to track speed is in error by +/- 3MPH... I have TWO GPS units, and both are off by different values, depending on what car it's in; Liberty, or the Vibe. They are not accurate either, even the maps are in error by 30meters, and you are told this in the directions, and disclaimers.

Too bad that Bolt On Supercharger is no longer in production man, that would help a lot. The intake is PLASTIC, so fabricating an intake for an Eaton SC is not ALL that hard, if you have the machinery. I know people who have cut their intake plenums up, and welded an Eaton to the intake, of course, with all the correct measurements so the belt will attach to the double pulley to wherever you use it...

I would like to see an Underdrive crank pulley for the KJ, for some more get-up and go.

 

[jnaut]

A GPS to track speed is in error by +/- 3MPH... I have TWO GPS units, and both are off by different values, depending on what car it's in; Liberty, or the Vibe. They are not accurate either, even the maps are in error by 30meters, and you are told this in the directions, and disclaimers.

The disclaimer and actual performance are two different things. Actual performance of a major brand GPS (Garmin) can be much, much better than that, depending on coverage etc. If you have a WAAS enabled GPS (I do... well, did until some punk stole it a few months ago) you can get repeatable horizontal accuracy within about 7 meters.

My GPS Always showed around 1.5mph slower than my Speedo. This lines up with the idea that most manufacturers calibrate their speedometers to error high, but never low.

I'm an avid kayaker, dealing with continuous speeds of 3 to 5mph. My speeds and averages always were accurate and mapped out when compared to traveling distances over maps. A gps with say, a 3mph speed error would show me traveling at 0mph, or 6mph. When you're on a kayak, you KNOW the difference between 3 and 6mph. You may have speed spikes which will show up briefly due to changes in coverage, but when you do low speed traveling on a GPS, you'll know pretty fast if your GPS is accurate or not. Different GPS's do better at low speed accuracy than others. My original GPS bought way back in the 90's wasn't good at low speed accuracy. So often my speed in my kayak did fluctuate between 0 and 7 mph. Most off-the-shelf GPS's of good brand will do a very accurate speed reading at higher speeds driven in a car.

Also as for your car's speedo, even small amounts of tread wear can have a statistically significant effect on Speedo calibration.

As for different GPS's, a lot can factor in its accuracy: sampling rate of the location can be a major factor. The higher the sampling rate, generally the more accurate the calculation. Garmin claims a .05 meter accuracy (.11 mph)

Lastly, steady speeds on a GPS will make a difference as opposed to rapidly changing or erratic speeds.

A good GPS should give you a very good idea of your actual speed.