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Author Topic: average speed.  (Read 2132 times)

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WillyGrubbs

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average speed.
« on: February 10, 2007, 08:05:02 PM »
 :puzzled:I wanted to take a kind of a census to see what the top speed is for some of the other jeep owners with the 4 bangers out there.  So if you would post how fast your wrangler can ride comfortably and what the top speed is it will help me get an idea of an average. I’m sure some of you have seen another post of mine wondering why my yj is so slow. I am trying to get an idea of what I should expect out of mine comparatively and then I will work on getting it where it needs to be.

Thanks everyone

Willy
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Offline Jeffy

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Re: average speed.
« Reply #1 on: February 10, 2007, 09:23:29 PM »
Official top speed is something like 98MPH I believe.  It would be scary to drive a lifted Jeep that fast though.

The problem you have with top speed is that it changes with gearing and tire combination.  Not to mention aerodynamics.  Still your jeep should be able to do 75mph fairly easily on a flat road.

55mph at 4000Rpm's is a lot in 4th.  I'm really wondering about the accuracy of the speedo and/or the gearing of that Jeep.  Can you crawl under it and look at the differential cover and read the ID tag on there.  It should be a metal tag at the 100'clock position.  There should be some three groups of letters and numbers.  What I'm looking for is teh middle set.  It should read something like 307, 354, 373, 410 or 411.
« Last Edit: February 10, 2007, 09:27:20 PM by Jeffy »
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

WillyGrubbs

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Re: average speed.
« Reply #2 on: February 10, 2007, 10:01:37 PM »
The front or rear differential? I am out of state now. When I get back home I will look for the number.

Thanks.
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Offline Jeffy

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Re: average speed.
« Reply #3 on: February 10, 2007, 10:18:08 PM »
Quote from: WillyGrubbs on February 10, 2007, 10:01:37 PM
The front or rear differential? I am out of state now. When I get back home I will look for the number.

Thanks.


It shouldn't matter, they are the same, except for 410/411.  Generally, an auto will have 373 while a manual will have 410 (Actual gears are 411 in the rear and 410 up front).  Now during times of low stock, Jeep has been known to mix and match ratios.  I've heard of a '95 having 354 instead of 373 and a manual could easily have 373 instead of 410/411.
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Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Jesse-James

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Re: average speed.
« Reply #4 on: February 10, 2007, 10:25:39 PM »
Couldn't tell ya my top speed, doesn't feel very safe above 70 so I don't take it any higher than that. With a headwind I struggle to keep 65 though. Flat ground with a tailwind I'm sure I could easily crack 80 but I wouldn't try it.
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/dev/null

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Re: average speed.
« Reply #5 on: February 11, 2007, 01:14:57 AM »
I'm running the stock gears on 31" tires with a OME lift, and 70 seems to about all she'll do comfortably.
With all the hills around here (San Diego) I find myself doing the 5-4-5 shift often. Next up will be a taller gear set. Hopefully, that'll help.

'Bout the only way I'd see anything higher than 75 is push it off a cliff.
A big cliff.

I mean REALLY big.  8)

Peter M
« Last Edit: February 11, 2007, 01:23:14 AM by /dev/null »
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j33p3r

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Re: average speed.
« Reply #6 on: February 11, 2007, 03:33:10 AM »
55 is the most comfortable.

I've been changing the tire pressures to see what works best with my setup.  I found that at 35psi I can run a little faster.  Drove to work the other day and was able to cruise at 65.  Started tire pressure at 45, then went to 40, 38,  and now 35.  May go down to 32psi and see how that works out.

I haven't been able to go over 70 downhill.  Doesn't feel safe going that fast.
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lanulos89

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Re: average speed.
« Reply #7 on: February 11, 2007, 06:42:54 AM »
80 when im feeling phsyco
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rwing1

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Re: average speed.
« Reply #8 on: February 11, 2007, 07:33:03 AM »
My bomb will routinely do 65-70 whether it's up/down hills on the way to work.  It does slow a bit in a heavy wind though.  Seems like being basically a brick on wheels, wind slows me down more than gravity!
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Offline chardrc

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Re: average speed.
« Reply #9 on: February 11, 2007, 08:57:29 AM »
before i did my 2 inch lift and 31's the fastest i went was 70 because my brother was with me and started getting scared when the jeep started bouncing up and down when went over 70... since i got my lift i haven't gone over 55 because i haven't gone on a freeway since i did the lift... but if i have hills and or a head wind   i can be stuck around 45 ( my motor isn't running as strong as it could)
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1990 YJ 4cly, ax5, 2.5 inch BDS lift, 31 MTr\'s,  Powertrax-lockers all around, track-bars removed, boomerang shackles, warn m8000 winch, electric fan. [sold but not forgotten]

2007 jk Rubicon 2dr

Offline SKI BOY

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Re: average speed.
« Reply #10 on: February 11, 2007, 09:48:46 AM »
75 - 80 ON THE FLATS
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Ski Boy

" It ain't broke til you can't fix it no more "

97 TJ, AT, 31'S ON AR CAST WHEELS, 4.0L TB / TBS, JET CHIP, CUSTOM HI-FLOW INTAKE, ON BOARD AIR, ELECT. RAD. FAN, SOFT TOP!

Offline supryj4

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Re: average speed.
« Reply #11 on: February 11, 2007, 10:38:50 AM »
I have a top speed of 80 but it will cruz at 70-75 all day.I have done alot of work to the motor and have 4:88s with 33s.
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90 YJ 2.5L MPI 33 MTRs on 15x10 US indy mags
F/super 30 ARB R/currie 44 ARB 4:88s

Chad

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Re: average speed.
« Reply #12 on: February 11, 2007, 05:54:25 PM »
before my lift with the stock 28" wheels I topped her out at 93 with the pedal to the metal in fifth going down a big hill with my car packed full of luggage and crap. 

Now with the lift and bigger tires tops out at about 70 but I think that the speedo is off by about 10% so like 77 i think
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Greatwhite

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Re: average speed.
« Reply #13 on: February 11, 2007, 06:10:35 PM »
I never pay much attention to how fast im going, just go with the flow of traffic...the jeep tells you when it doesnt want to go any faster but you have to remember its a jeep not a sports car :thumb:
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dunklervogel

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Re: average speed.
« Reply #14 on: February 11, 2007, 06:37:29 PM »
I was on a straight road for a few miles and got her up to 90.
That was with stock suspension and 30s

I have gotten two speeding tickets in the last 5 months though for doing 73ish in a 55  :brick:
I don't find it very hard to get to 75 (sometimes I don't notice I'm going that fast if there is no traffic around) ...but above that I have to work it a bit more and it becomes a lot more noticeable that I'm going fast.

Now that I have a 2" BB installed and 32s on the way... that will probably change though.  :uhoh:
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