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  #1  
Old November 17th, 2013, 07:59 PM
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Bill Ski
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110 rpm

So who else is running a LT95 that has a tach installed.

My idle double checked on 2 tachs is 400 rpm and it's smooth. I'm going to adjust it to about 700 rpm.

At 55 mph though I'm turning about 3100 rpm That's insane. Is anyone else seeing that kind of rpm?
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  #2  
Old November 17th, 2013, 08:11 PM
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John B.
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Buy a laser tach. They are cheap and you will know the true speed and be able to properly adjust the tach.
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Old November 17th, 2013, 08:15 PM
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mark kellgren
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I used an iphone app that used the mic to deterine rpm and I set my adjustable vdo with that. i didn't trust it's precision though, so bought a $15 laser tach off ebay. turns out it was spot on.
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Old November 17th, 2013, 08:30 PM
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I believe the tach is accurate, that's pretty cool though had never seen one of those. Not sure how it would help check rpm at 55 mph though?

That is what concerns me that just seems damn high. My MGB turns those kind of rpms at that speed but it's a little 4 cyl and that seems more reasonable.
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Old November 17th, 2013, 08:35 PM
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What size tires? The calculator at ashcroft shows that would be about right if you had 29" tall disco size tires.
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Old November 17th, 2013, 08:48 PM
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7.50x16 stock size. I'll be switching hopefully this week to 32's, that should help a bit I guess lol.

Thanks Jafir, I need a 5 speed or to switch the 4hp22 that seems like it is just hard on the motor.
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Old November 17th, 2013, 08:52 PM
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You don't check while driving. You turn up y
The engine speed to 2000 or so with the throttle cable and then adjust the tach. It will them always be correct.
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Old November 17th, 2013, 08:52 PM
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mark kellgren
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Quote:
Originally Posted by ArmyRover View Post
I believe the tach is accurate, that's pretty cool though had never seen one of those. Not sure how it would help check rpm at 55 mph though?

That is what concerns me that just seems damn high. My MGB turns those kind of rpms at that speed but it's a little 4 cyl and that seems more reasonable.
If you are sure your tach is accurate then use the ratio calculator on ashcroft siite to plot rpm curves for your rig.
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Old November 17th, 2013, 08:53 PM
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7.5x16 are 32" tires.
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Old November 17th, 2013, 08:54 PM
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Quote:
Originally Posted by Overlander View Post

If you are sure your tach is accurate then use the ratio calculator on ashcroft siite to plot rpm curves for your rig.
Maybe you hv a 1.6 tcase :0
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Old November 17th, 2013, 08:55 PM
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Assuming the lt95 is originally from a 110, then the high range ratio would be 1.3:1
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Old November 17th, 2013, 09:00 PM
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I always thought the 7.50 were 31" learn something new everyday.

While I'm pretty sure the tach is accurate, I didn't take into account the speedo being off. I'll check it tomorrow against my gps reading to see what it says. If it's off by 10% which wouldn't overly surprise me that would line it up pretty much dead on the ashcroft calculator.

I guess it just really surprised me to see the cruising rpm being that high on a V8.
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Old November 17th, 2013, 09:01 PM
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Put 35" tires on it.
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  #14  
Old November 17th, 2013, 09:20 PM
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Bill Ski
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lol that would drop the rpm a bit.

I think I just need to put the 4hp22 in it that would bring it down about 1000 rpm at cruise
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Old November 18th, 2013, 12:47 PM
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J. Michael McCaig
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My 110 originally had a LT95 and was turning about the same RPM's as yours at the same speed. I finally changed it to a 5 spd and a LT230 1.2 transfer case and it is much better on the highway. I left the idle set down low which for me works well off-road. It will idle all the way down to 300 RPM without stalling which is great when I need to crawl along.
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