2005 Rubicon rpm's at 65 MPH (Manual Tranny Only) - JeepForum.com
 
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post #1 of 14 Old 05-07-2007, 06:05 PM Thread Starter
cpleasant
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2005 Rubicon rpm's at 65 MPH (Manual Tranny Only)

I was wondering if anyone could post what their Rubicon with the NV3550 tranny (early models) rpm were at 65 mph? I wanted to know because I just had some 4.10's installed in my 02 with the 4.0 and nv3550. My tires are slightly larger than the Rubi (31x10.5 vs. 30.5x9.5)

I just wanted to compare..


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Originally Posted by liredneck View Post
I know your rite I seid the dealer seid the same thing as you and that I don't want them there , but I was asking another qeustin as in what do I do about the slots in the brackets couse if I just put a bolt in there it will slide back and fourth but again thank you all knowing and powerfull jeep god sorry us lesser jeep peeons might have some more qeustins in the future , so please if there to much for you sit back relax go to the next post

Last edited by cpleasant; 05-08-2007 at 05:27 PM.
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post #2 of 14 Old 05-07-2007, 06:52 PM
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http://www.ringpinion.com/Calc_RPM.aspx

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post #3 of 14 Old 05-07-2007, 10:55 PM Thread Starter
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Let me be a little more specific. looking for 5th gear with people's actual experience.

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Originally Posted by liredneck View Post
I know your rite I seid the dealer seid the same thing as you and that I don't want them there , but I was asking another qeustin as in what do I do about the slots in the brackets couse if I just put a bolt in there it will slide back and fourth but again thank you all knowing and powerfull jeep god sorry us lesser jeep peeons might have some more qeustins in the future , so please if there to much for you sit back relax go to the next post
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post #4 of 14 Old 05-07-2007, 11:14 PM
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My 2006 wrangler unlimited (6 speed transmission 3.73 gears) is at around 2,000-2,200 rpms in 6th gear at 60 mph i believe.. i don't really go to much faster than that. Heck i dont think i've ever gone faster then 65 in my lj

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post #5 of 14 Old 05-08-2007, 06:41 AM
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My bone stock Rubi is spinning 2500 rpm at 70 mph (true 70 as per GPS), which would calculate to about 2320 rpm at 65.

By the way, if you check your tire manufacturer's specs for 31x10.5, you will probably find that the listed diameter is within a tenth of an inch of the Rubi's 245/75R16 OEM tires...essentially the exact same diameters. So your results should be pretty darn close to mine. Remember that your speedometer and odometer will indicate a little different that they did with the stock tires. You might want to GPS verify it. It is not out of the question that it could actually be more accurate with the 31's than it was before.

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post #6 of 14 Old 05-08-2007, 09:10 AM Thread Starter
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I had to change my speedo gear when the axle gears were changed. It was WAY off. Bad thing is it seems that the website that I bought it from had bad info as to which one I need. I still have to check it with gps to see exactly how far off it is.

Quote:
Originally Posted by liredneck View Post
I know your rite I seid the dealer seid the same thing as you and that I don't want them there , but I was asking another qeustin as in what do I do about the slots in the brackets couse if I just put a bolt in there it will slide back and fourth but again thank you all knowing and powerfull jeep god sorry us lesser jeep peeons might have some more qeustins in the future , so please if there to much for you sit back relax go to the next post
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post #7 of 14 Old 05-08-2007, 09:29 AM
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65mph x 4.10 ratio x 336 / 30.3" tall x .84 OD ratio = 2,482-2,500rpm.

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post #8 of 14 Old 05-08-2007, 02:27 PM
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Quote:
Originally Posted by hoseclamp
65mph x 4.10 ratio x 336 / 30.3" tall x .84 OD ratio = 2,482-2,500rpm.

NV3550 has a 0.78 OD ratio.

'03 red Rubi
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post #9 of 14 Old 05-08-2007, 04:06 PM
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The '05's and newer got the 6sp with a .84 reduction, the 5sp like my '04 has the .78, I understood he was wanting the 2005 rpm's, correct? Regardless, the '04 and older style tranny would be pprox 2,[email protected]

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post #10 of 14 Old 05-08-2007, 05:28 PM Thread Starter
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Sorry, I meant PRE 05 models. My screw up. Its fixed.

Quote:
Originally Posted by liredneck View Post
I know your rite I seid the dealer seid the same thing as you and that I don't want them there , but I was asking another qeustin as in what do I do about the slots in the brackets couse if I just put a bolt in there it will slide back and fourth but again thank you all knowing and powerfull jeep god sorry us lesser jeep peeons might have some more qeustins in the future , so please if there to much for you sit back relax go to the next post
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post #11 of 14 Old 05-08-2007, 07:01 PM
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I checked mine on the way home today and it is running 2350-2400 at 65.

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post #12 of 14 Old 05-08-2007, 07:41 PM
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Quote:
Originally Posted by kingvm
I checked mine on the way home today and it is running 2350-2400 at 65.
So i guess the 6 speed transmission actually does help a little on the gas saving.. i looked at my tach when i was driving home today and it was like i said.. 2,200 rpms. not to much less.. but its less! (thats 60 mph)

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post #13 of 14 Old 05-09-2007, 06:46 AM
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Quote:
Originally Posted by WILLY348
So i guess the 6 speed transmission actually does help a little on the gas saving.. i looked at my tach when i was driving home today and it was like i said.. 2,200 rpms. not to much less.. but its less! (thats 60 mph)
Lower RPM does not always translate to better gas mileage.

The 6 speed will turn higher RPM than the 5 speeds if all other factors are equal.
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post #14 of 14 Old 05-09-2007, 08:53 AM
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Quote:
Originally Posted by Wheelin98TJ
Lower RPM does not always translate to better gas mileage.

The 6 speed will turn higher RPM than the 5 speeds if all other factors are equal.
Correct. From what I am seeing the 4.0 is happier running at about 2800-3000 RPM at 70 MPH or freeway speed. On the ROF there has been a number of people who experimented with running their 6 speeds in 5th gear only on the autobahn and the gas mileage in most cases went up 1-2 and in some case more MPG. Now these were all stock geared Rubicons with the 4.10 axles and 33" tires. The consensus seems to be a 4.88 or 5.13 works well for Jeeps with 33" and 35" tires and standard shift 6 speed transmissions. The 5.13 is best for the 5 speed as it has a higher Overdrive. The 5.13 is the best for automatics. The 2800-3000 RPMs at highway speeds is the sweet spot. Here's a link with a calculator to see what you have.

http://www.grimmjeeper.com/gears.html

I think I will eventually go with 4.88's for my 33" tires.

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