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Old 04-06-2009 | 10:41 PM
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6th gear
In 6th gear on the interstate my rpms are at 4,000 to 5,000 goin between 70 to 80 mph is that normal

This is an 04
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Old 04-06-2009 | 10:44 PM
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yes.
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Old 04-06-2009 | 10:47 PM
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Indeed ... thats normal ... Our 8's turn a lot of rpms
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Old 04-06-2009 | 10:53 PM
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Originally Posted by Sheehan
Indeed ... thats normal ... Our 8's turn a lot of rpms
The high RPMs per MPH are b/c the 8 has 4.44s (which is high compared to some other cars)
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Old 04-06-2009 | 11:04 PM
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Perfectly normal
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Old 04-06-2009 | 11:06 PM
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3500rpms is 70mph for me
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Old 04-06-2009 | 11:10 PM
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3k rpms @ 62.5mph is normal for me
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Old 04-06-2009 | 11:16 PM
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Originally Posted by blackmagic99
In 6th gear on the interstate my rpms are at 4,000 to 5,000 goin between 70 to 80 mph is that normal

This is an 04
Are your transmission and tire sizes stock?

4000 rpms = 80 mph in my car and another RX-8 owner told me the same. As gukdoebabdoe said, this would be 70 mph @ 3500 rpms. At 5000 you should be going 100 mph !
Last edited by rx8cited; 04-06-2009 at 11:19 PM.
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Old 04-06-2009 | 11:28 PM
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that seems a bit high to me. there is an exact answer to this.

in 3rd, 70 mph is 7000 rpms

this is true, i assume, for all stock rx8s.

not sure what it is in 6th, but there's a mathematical formula available to find it. i'm not sure what that is either.
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Old 04-06-2009 | 11:45 PM
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Originally Posted by blackmagic99
In 6th gear on the interstate my rpms are at 4,000 to 5,000 goin between 70 to 80 mph is that normal

This is an 04
how could it be otherwise?
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Old 04-07-2009 | 12:15 AM
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Originally Posted by myriadshalaks
.....
not sure what it is in 6th, but there's a mathematical formula available to find it. i'm not sure what that is either.
Formula for 04 GT:
(tach reading in 6th gear / 1000) * 20 mph = speedometer reading in 6th gear
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Old 04-07-2009 | 02:16 PM
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in 6th gear, every 20mph is 1k rpm.

2k rpm = 40mph
3k rpm = 60mph
4k rpm = 80mph
5k rpm = 100mph
6k rpm = 120mph
7k rpm = 140mph
8k rpm = 160mph
9k rpm = 180mph

at least for me. i dont know about the last half personally, but its been accurate for the first half. my tires are 245/40/18.
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Old 04-07-2009 | 11:00 PM
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Yeah, 80 at 4k for me
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Old 02-02-2010 | 01:44 PM
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i wish 6th was taller.... would definitely help highway mpg's =/
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Old 02-02-2010 | 04:11 PM
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Yup, I wish 6th were 3k @ 70mph..
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Old 02-02-2010 | 04:13 PM
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Damn nubz....



Attached Thumbnails 6th gear-speed-rpm.gif  
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Old 02-02-2010 | 08:10 PM
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sounds about right....
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Old 02-02-2010 | 10:57 PM
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After 10 months ??
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Old 02-03-2010 | 12:28 AM
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very very normal
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Old 02-03-2010 | 11:26 AM
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there should be a mod for taller gearing in 6th....lol
the scion tC i used to have also revved pretty high too. at around 80mph in 5th it was close to 4k. does crap for hwy mpg's.....
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Old 02-03-2010 | 02:58 PM
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The way I remember rpm vs mph for each gear is that at 3000 rpm the speed for 2nd through 6th is pretty close to 10 times the gear number.

That makes it easy to figure out which gear I'm in without looking at the shift lever or remembering what I just did.

Ken
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Old 02-03-2010 | 11:31 PM
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Originally Posted by silverbullet05
there should be a mod for taller gearing in 6th....lol
the scion tC i used to have also revved pretty high too. at around 80mph in 5th it was close to 4k. does crap for hwy mpg's.....
there is.

09 transmission
change rear gear
taller tires

beers
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Old 02-03-2010 | 11:48 PM
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anyone know why my 6th gear makes water flowing sound??? it gets too annoying so im driving 70 in 5th gear...
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Old 02-04-2010 | 01:17 AM
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sounds about right wait i have an at how would i know
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Old 02-04-2010 | 06:07 AM
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From: sevenONEfour
sounds about at..cruising in 6th at 74 mph i'm usually around 4k rpm
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