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Old 12-09-2018, 02:03 AM   #31
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Default Re: What should the RPM's be at 70 mph

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Originally Posted by calbiker View Post
Should be around 2640 rpm at 70.
that is exactly where my 2017 144 is at
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Old 12-09-2018, 02:54 AM   #32
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Default Re: What should the RPM's be at 70 mph

Could someone analog this pic. with some algebra and forecast what the rpm would be @ 70mph?
image.jpg
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Old 12-09-2018, 09:58 AM   #33
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Default Re: What should the RPM's be at 70 mph

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Originally Posted by CJPJ View Post
Could someone analog this pic. with some algebra and forecast what the rpm would be @ 70mph?
Attachment 104925
If I read the figures as 53 mph and 2,200 rpm then the algebra is:

2,200 / 53 x 70

So at 70 mph would be approx 2,900 rpm.

But do bear in mind your speedo will likely be over reading by maybe 2 to 3 mph so can you get an accurate speed either from GPS or through CAN with something like a ScanGauge II?

Keith.
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Old 12-09-2018, 01:05 PM   #34
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Default Re: What should the RPM's be at 70 mph

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Originally Posted by hippy View Post
Today I did 70mph it was 3200rpm
Sounds like mine...in 4th gear! 2600 in 5th rolling at ~10,800lbs.
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Old 12-13-2018, 07:20 PM   #35
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Default Re: What should the RPM's be at 70 mph

Just in case anyone finds this useful...

*edit* to be clear, being in the antipodes this is kmh, Not miles. If anyone has a 110mph sprinter, I'd like to see that!
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File Type: jpg DSC_1239.jpg (30.8 KB, 41 views)

Last edited by whambulance; 12-13-2018 at 07:23 PM.
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Old 12-13-2018, 07:26 PM   #36
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Default Re: What should the RPM's be at 70 mph

My 2008 170", high roof 2500 cargo van runs at 2600 RPM at 70 MPH.
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Old 12-17-2018, 03:24 PM   #37
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Default Re: What should the RPM's be at 70 mph

Results from a 2 hour freeway cruise yesterday.
60 MPH = 2200 RPM
65 MPH = 2400 RPM
70 MPH = 2600 RPM.
All results were noted on a relatively flat stretch of roadway, transmission in D, with minimal winds, at an ambient temperature of 44F. 13,000 miles on the engine & drive train. 3.0L V6 w/5 speed auto transmission. Forgot to mention the RV weighed 10,400 lbs.
Fluid temps were 214 EOT, 197 fWT, and 145 TFT for those with SGII real time gauges, for comparison.
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Last edited by Winterbagoal; 12-17-2018 at 05:26 PM.
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Old 12-18-2018, 08:46 AM   #38
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Default Re: What should the RPM's be at 70 mph

....and what's TFT?
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Old 12-18-2018, 09:46 AM   #39
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Default Re: What should the RPM's be at 70 mph

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Originally Posted by irvingj View Post
....and what's TFT?
Transmission Fluid Temperature.

I added custom ScanGauge II Sprinter gauges earlier this year from info derived from this thread. It may have been one of them, as I believe/seem to recall the SGII doesn't have a generic TFT gauge.
http://www.irv2.com/forums/f280/scan...er-374228.html
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Last edited by Winterbagoal; 12-18-2018 at 09:55 AM.
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