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RPMs at 70?

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Old Jan 7, 2008 | 09:23 PM
  #1  
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RPMs at 70?

Hi, i have a 96 7.3 with a 5 spd, 285/75/16 tires and 4:10 gears and the tach reads around 2900 at 70 mph. Can this be right? I was wondering if maybe the tach was off? It seemed like the 94 460 with 4:10s and a 5pd I had only ran around 2400 or so.
 
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Old Jan 7, 2008 | 10:49 PM
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Originally Posted by k460
Hi, i have a 96 7.3 with a 5 spd, 285/75/16 tires and 4:10 gears and the tach reads around 2900 at 70 mph. Can this be right? I was wondering if maybe the tach was off? It seemed like the 94 460 with 4:10s and a 5pd I had only ran around 2400 or so.
Sounds like your tach is off. I have a 96 7.3 automatic with a 356 (?) rear end. At 70 she is turning around 1800 RPM.

Justin
 
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Old Jan 7, 2008 | 11:22 PM
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235-85s with 4.10 gearing, 5 speed @ 70mph the rpms are right at 2500
 
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Old Jan 8, 2008 | 12:19 AM
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Originally Posted by ForemanES
235-85s with 4.10 gearing, 5 speed @ 70mph the rpms are right at 2500
foreman how many mpgs you getting?
 
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Old Jan 8, 2008 | 06:33 AM
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285/75 R16, 4:10 GEARS, AUTO 2200 RPM. Havent checked the milage in a while about 16 the last time I checked. You can reset the speed-ometer to compensate for bigger tires, but I don't know how thats done.
 
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Old Jan 8, 2008 | 07:43 AM
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I had my speedo checked and when I had 4.10 gears I was running 2500 rpm. Now with 3.55's I'm running 2100. That's at 60 mph though. 235-85's both times. Oh yeah. 5 speed
 
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Old Jan 8, 2008 | 12:47 PM
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Originally Posted by gt8684
foreman how many mpgs you getting?
If I keep it at 70mph in the summer I have seen 19mpg on the highway. Doing 75-80 it drops to about 16. I have seen an all time best doing 55 on a long trip, about 21 mpg.
 
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Old Jan 8, 2008 | 02:09 PM
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I get about 2500 at 70 with 4.10's and a 5 speed
 
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Old Jan 8, 2008 | 02:31 PM
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neal what size tires you running?
 
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Old Jan 8, 2008 | 04:25 PM
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295/75-16 BFG's
 
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Old Jan 8, 2008 | 05:27 PM
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Well, there must be somthing wrong, this morning going to school i was running about 2450 or so at 70 and it has been like that all day. Any ideas?
 
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Old Jan 8, 2008 | 06:35 PM
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315\75\16's on 4.10's auto trans, 70=2000
 
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Old Jan 9, 2008 | 10:30 AM
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k460 it sounds as if you never went to school. To fix your problem lift up on right foot. It is pretty hard to do but with some persistance it can be done.

Joe I believe the auto's allow for lower rpm's than the 5 speed's. I wouldn't imagine that the tire size will drop it 500 rpm's. What doyou think?
 
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Old Jan 9, 2008 | 12:13 PM
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you need to recalibrate your psom. look at the write up on steve baz's page.
 
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Old Jan 9, 2008 | 05:59 PM
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Neal 97 250: - k460 it sounds as if you never went to school. To fix your problem lift up on right foot. It is pretty hard to do but with some persistance it can be done.
What are you talking about? The tach changes what it reads and the speed stays the same while the rpms change.

You sound like you need to go back to school and work on reading comprehension?! That comment was not only ignorant but very out of line.
 
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