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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32632
Location: Reading Pennsylvania
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skills@eurocarsplus
Samba Peckerhead
Joined: January 01, 2007
Posts: 16883
Location: sticksville, ct.
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 Posted: Sun Apr 04, 2021 4:33 pm Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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really don't have a good answer other than do you trust your tire size and tach.
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| gprudenciop wrote: |
my reason for switching to subaru is my german car was turning chinese so i said fuck it and went japanese....... |
| Jake Raby wrote: |
| Thanks for the correction. I used to be a nice guy, then I ruined it by exposing myself to the public. |
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djkeev
Samba Moderator
Joined: September 30, 2007
Posts: 32632
Location: Reading Pennsylvania
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50352
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| Posted: Sun Apr 04, 2021 11:48 pm Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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| IIRC the stall speed of the torque converter is 2700 rpm so add a bit of movement to the vehicle and the engine is going to be running at 3000 rpm or higher most any time that the throttle is to the floor. The high stall speed is how you get a riding lawnmower engine to move a two ton brick. |
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AceTaylor
Samba Member
Joined: July 15, 2009
Posts: 139
Location: PERKASIE, PA
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| Posted: Mon Apr 05, 2021 5:48 am Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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| Those speeds seem about right. It's been a while since I've been on a long trip with this car, but it seem to me 70 mph was about 4150 rpm. I would love a lock up torque converter. |
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kamzcab86
Samba Moderator
Joined: July 26, 2008
Posts: 7925
Location: Arizona
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| Posted: Mon Apr 05, 2021 9:24 am Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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My 1990 2.1 with automatic and 200,000 miles on the clock (trans rebuilt with 3rd owner back in 2008-ish), 15" tires with stock diameter (but slightly wider than stock):
3800 rpm = 68 mph
(Speed is via GPS.)
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~Kamz 
1986 Cabriolet: www.Cabby-Info.com
 1990 Vanagon Westfalia: Old Blue's Blog
2016 Golf GTI S
"Real knowledge is to know the extent of one's ignorance." - 孔子 |
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4Gears4Tires
Samba Member
Joined: October 08, 2018
Posts: 3054
Location: MD
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| Posted: Mon Apr 05, 2021 9:34 am Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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If you really wanted to be accurate:
You could double check the accuracy of your tach with a handheld unit. It comes with reflective tape, so just cut a square and stick it on the crank somewhere.
https://www.amazon.com/Neiko-20713A-Digital-Tachom...amp;sr=8-3
Have a friend hold 1000rpm, 2000rpm, 3000rpm, etc and see the % discrepancy.
Then, download a speed app on to your phone and have it run while you drive down the road and compare all your data.
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'87 Syncro
Ferric Oxyhydroxide Superleggera Edition |
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eeebee
Samba Member
Joined: July 17, 2009
Posts: 431
Location: Tujunga
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| Posted: Mon Apr 05, 2021 11:30 am Post subject: Re: Automatic 1.9 or 2.1 RPM's and Speed |
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I would estimate that I am getting the same relationship that you are. I did not notice any change when the torque converter was replaced along with the new transmission.
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Eric
1987 Vanagon Wolfsburg Special Edition
GoWesty 2.3
Democracy is the recurrent suspicion that more than half of the people are right more than half of the time. |
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