Print Page - 5th gear, 3000 rpm = speed?

Title: 5th gear, 3000 rpm = speed?
Post by: L18M on May 21, 2011, 10:00:01 AM

just wondering if this sounds normal.
5th gear, 3000 rmp and doing about 65mph on flat roads.

it seems a bit slow to me..

Title: 5th gear, 3000 rpm = speed?
Post by: Brett on May 21, 2011, 10:31:36 AM

Sounds right for an EGI, got a feeling the TII should be over 70 at that point.

Title: 5th gear, 3000 rpm = speed?
Post by: johnf on May 21, 2011, 11:05:05 AM

Are you confident you speedo is reading correctly.

Have you changed tyre sizes as that would have an effect.

John

Title: 5th gear, 3000 rpm = speed?
Post by: TiddlesRX7 on May 21, 2011, 11:10:06 AM

Think thats not far out iirc. Got a feeling its between 65-70 mph.

Title: 5th gear, 3000 rpm = speed?
Post by: yiug412 on May 21, 2011, 05:45:05 PM

My JDM TII about 10x km/h for 3000rpm engine speed in 5th gear. all reading from the stock gauage.

Title: 5th gear, 3000 rpm = speed?
Post by: L18M on May 21, 2011, 06:56:07 PM

wheel/ tyre size is upgraded to 17" with 235 45 i think. cant remember off hand.
cheers for the replies.. i was kind hoping i had a close ratio box lol or different final drive for more acc not top end.

oh well :)

Title: 5th gear, 3000 rpm = speed?
Post by: papercutout on May 22, 2011, 07:43:09 PM

I\'m running 225/45/17\'s on the rear and mine reads about 70mph, or slightly over.

Title: 5th gear, 3000 rpm = speed?
Post by: captainbizzaro on May 22, 2011, 07:46:59 PM

Did this today funnily enough-just FYI it\'s a Series 5 box, Series 2 diff and was 70MPH at 3400. Not particularly helpful I know but worth a mention.

Title: 5th gear, 3000 rpm = speed?
Post by: Prof on May 22, 2011, 08:49:52 PM

Looking at my emange data - 4000 rpm is approx 160 kmh, so that\'s 100mph in old money.

3000 rpm would be 75 then.

(5th Gear)

Title: 5th gear, 3000 rpm = speed?
Post by: antnicuk on May 22, 2011, 09:29:56 PM

let me know your tyre size and if its stock turbo II gearbox and diff and i can tell you your speeds at all rpm and gears as i have a gear calculator but dont know how to post it up here.

Title: 5th gear, 3000 rpm = speed?
Post by: L18M on May 22, 2011, 10:59:31 PM

cheers tony, its 235/45/17 on 9j rims.
should be stock box and assume final drive on diff as stock. i not cracked open the rear diff so not 100% sure on diff.

Title: 5th gear, 3000 rpm = speed?
Post by: antnicuk on May 23, 2011, 07:40:32 AM

i cant make it come out on the boards without looking like gibberish but basically 2934 rpm is 75 mph, give me you email and i will save it in a word doc and send it across.

Title: 5th gear, 3000 rpm = speed?
Post by: L18M on May 23, 2011, 09:59:18 AM

wow.. thats like 120kmph
i dont even get that sitting just over 3000rpm. maybe more load due to the diff?
w.liam.li (at) gmail.com

cheers again :)

Title: 5th gear, 3000 rpm = speed?
Post by: antnicuk on May 23, 2011, 04:35:12 PM

thats based on a normal coupe FC turbo II diff final drive of 4.1. If its a convertible it will be a 3.9 IIRC but they had smaller wheels as stock.

Email sent

Title: 5th gear, 3000 rpm = speed?
Post by: L18M on May 23, 2011, 07:07:25 PM

the table..

(http://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc6/248971_10150195117091825_509706824_7310969_7285354_n.jpg)
(http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/228604_10150195117131825_509706824_7310970_5121446_n.jpg)

Mazda Rotary Club

Cars by Model Type => 2nd generation RX-7's => Topic started by: L18M on May 21, 2011, 10:00:01 AM