Subaru Enthusiasts Car Club of the Sierras  

Go Back   Subaru Enthusiasts Car Club of the Sierras > Car Enthusiast Forums > Technical Chat

Technical Chat Ask and answer technical car questions.

Reply
 
Thread Tools
Old 2011-04-03, 06:32 PM   #1
Dean
Seņor Cheap Bastarde
 
Dean's Avatar
 
Real Name: Dean
Join Date: May 2003
Location: $99 Tire Store
Posts: 9,294
 
Car: $.04 STI
Class: Fast,Cheap & Reliable=STI
 
Deal, did somebody say Deal? Oh, Dean, yeah that's me.
Default Gear ratios and RPM at cruising speeds?

From our earlier conversation on this, I made some observations on the way home from Fernley and would be interested to see what other people in other cars get in the real world vs. what the specs say they are.

Everything is rounded to as close as I could get/estimate and hold for some time in a straight line on cruise.

Code:
Car: '04 STI
Wheels: 17x8 RPF1s
Tires: 225/45/17 RE070s
Gear RPM  Speedo GPS Speed
6th  2750  70       66
6th  2900  75       70
6th  3100  80       75
Speedometer error is pretty interesting considering these are the OEM tires on only slightly wider wheels.
__________________
I am a Commodore PET --- Now get off my lawn you kids...

Last edited by Dean; 2011-04-03 at 06:34 PM.
Dean is offline   Reply With Quote
Old 2011-04-03, 11:07 PM   #2
sperry
The Doink
 
sperry's Avatar
 
Real Name: Scott
Join Date: Nov 2002
Location: Portland, OR
Posts: 20,335
 
Car: '09 OBXT, '02 WRX, '96 Miata
Class: PDX/TT-6
 
The way out is through
Default

The speedo is well known to read high. It's great for running massive snows on the car and having a more accurate speedo rather than less accurate.
__________________
Is you is, or is you ain't, my con-stit-u-ints?
sperry is offline   Reply With Quote
Old 2011-04-04, 06:57 AM   #3
100_Percent_Juice
(40 percent vodka)
 
100_Percent_Juice's Avatar
 
Real Name: Joel
Join Date: Oct 2006
Location: Reno, NV
Posts: 4,446
 
Car: 2004WRX
Class: Baby-Hauler/GroceryGetter
Default

I will have to do this again. I remember I tried this when I first got my Garmin and I think it was pretty accurate.
__________________
"A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin
100_Percent_Juice is offline   Reply With Quote
Old 2011-04-04, 07:25 PM   #4
cody
Candy Mountain
 
cody's Avatar
 
Real Name: Cody
Join Date: May 2005
Location: Californication
Posts: 7,751
 
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
 
OMG Internet!
Default

With my stock size snows, my TomTom says I'm going about 58 when the speedo says 60.
__________________
Slow and low, that is the tempo.
cody is offline   Reply With Quote
Old 2011-04-04, 07:56 PM   #5
szucchet
EJ22
 
szucchet's Avatar
 
Real Name: Silvio
Join Date: Jul 2008
Location: sacramento, ca
Posts: 271
 
Car: 2004 Subaru STI
Class: 04 TSM
 
smooth is fast
Default

my 04 sti is about the same as deans except my is on 255/40/17
__________________
funny how day by day nothing changes, but when i look back everything is different
szucchet is offline   Reply With Quote
Old 2011-04-05, 08:39 AM   #6
Double Phister
EJ22
 
Double Phister's Avatar
 
Join Date: Mar 2005
Location: Elk Grove, CA
Posts: 450
 
Car: 2005 WRX STi
 
"I'm sideways and in control... I look good."
Default

I know the speedo is off. I wonder how accurate the odo is. I'll bet the error is not the same.
__________________
Dan - '05 Black WRX STi.
My Mods
Double Phister is offline   Reply With Quote
Old 2011-04-05, 12:14 PM   #7
A1337STI
EJ205
 
A1337STI's Avatar
 
Join Date: Jan 2006
Location: Reno, NV
Posts: 1,840
 
Car: Impreza and an Impreza
Class: AS / CRS PerfStock
 
"pedal on the right"
Default

My sti speedo to GPS (on stock sized tires) was reading the same way.
__________________
Fighting uphill battles, one bullet at a time!


A1337STI is offline   Reply With Quote
Old 2011-04-06, 10:30 AM   #8
WRXlerate
EJ22
 
WRXlerate's Avatar
 
Real Name: John B.
Join Date: May 2005
Location: Behind a brick wall.
Posts: 471
 
Car: 02 Soccermom Wagon
Class: "sleeper"
 
Destroying V8 Egos 4 cylinders at a time
Default

Now I see why I have not had a speeding ticket in a while. I think I'm doing the normal 10 over on the freeway but am really only doing 5 over.
Good to know.
__________________
Stuff sold by the gram is always more exciting than stuff sold by the pound. JC
WRXlerate is offline   Reply With Quote
Old 2011-04-06, 11:39 AM   #9
Dean
Seņor Cheap Bastarde
 
Dean's Avatar
 
Real Name: Dean
Join Date: May 2003
Location: $99 Tire Store
Posts: 9,294
 
Car: $.04 STI
Class: Fast,Cheap & Reliable=STI
 
Deal, did somebody say Deal? Oh, Dean, yeah that's me.
Default

Come on, somebody with a WRX, preferably bugeye 5MT, do the whole RPM/Speedo/GPS thing, please...
__________________
I am a Commodore PET --- Now get off my lawn you kids...
Dean is offline   Reply With Quote
Old 2011-04-06, 11:44 AM   #10
cody
Candy Mountain
 
cody's Avatar
 
Real Name: Cody
Join Date: May 2005
Location: Californication
Posts: 7,751
 
Car: 03 Pussy Wagon, now with more pink!
Class: TESP
 
OMG Internet!
Default

I'll try it on my way home.
__________________
Slow and low, that is the tempo.
cody is offline   Reply With Quote
Old 2011-04-06, 01:10 PM   #11
k-dogg39
Little Slugger
 
k-dogg39's Avatar
 
Real Name: Kevin
Join Date: Jan 2007
Location: North Lake Tahoe, NV
Posts: 777
 
Car: 05 WRB STI Wagon/00 BRP GC Sedan
Class: 39 TSM
 
I'm not crazy, I'm just passionate!
Default

I should be on the freeway this weekend, so I can check mine too with the 6-speed.
k-dogg39 is offline   Reply With Quote
Old 2011-04-06, 03:40 PM   #12
A1337STI
EJ205
 
A1337STI's Avatar
 
Join Date: Jan 2006
Location: Reno, NV
Posts: 1,840
 
Car: Impreza and an Impreza
Class: AS / CRS PerfStock
 
"pedal on the right"
Default

I'll do some testing with my 93 RS once its running. (98 transmission)

oh last night speedo 65, GPS 65 Tire size? 215/55/17 5.4% over sized.
__________________
Fighting uphill battles, one bullet at a time!


A1337STI is offline   Reply With Quote
Old 2011-04-08, 11:59 AM   #13
szucchet
EJ22
 
szucchet's Avatar
 
Real Name: Silvio
Join Date: Jul 2008
Location: sacramento, ca
Posts: 271
 
Car: 2004 Subaru STI
Class: 04 TSM
 
smooth is fast
Default

Quote:
Originally Posted by WRXlerate View Post
I think I'm doing the normal 10 over on the freeway but am really only doing 5 over.
Good to know.
NO... bad to know, i wish i did know because i compensate for it
__________________
funny how day by day nothing changes, but when i look back everything is different
szucchet is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -8. The time now is 12:28 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
All Content Copyright Subaru Enthusiasts Car Club of the Sierras unless otherwise noted.