NickG

Hi all. Does anyone have precise info on the maximum speeds in each of the 8's six gears at redline? I don't own one ( yet! ) but am curious. During my two test drives I've been too busy watching the tacho to notice the speed at the upchange points! Not that easy to do so in any case as the digital speedo seems to me to be a bit of a jumble when you are accelerating hard! (Tried to search on this but without luck - maybe my keywords were wrong).

Peggy

(1) 41 MPH
(2) 68 MPH
(3) 94 MPH
(4) 130 MPH
(5) 150 MPH
(6) 150 MPH

Hey, I got this from an article by Automobile Magazine I got at the dealer. These aren't my numbers, so if anybody records anything different, feel free to correct me.

Oh, and by the way, I'm not "Peggy". This forum seems to have a problem with user sign on's. I hope someone else won't be able to hack into my profile when I get my own username.

DragonStar4681

i think first at redline is about 40 thats all i know.

Chef RX-8

I was able to get to 43 at 9000 RPM's in first and then 71 in second.

FirstSpin

I've been to 91 in 3rd....

MikeA

Good luck getting the right numbers.....since everyone is a chicken around here when it comes to hauling ***.....

Jeff_pap31s

Now that was comedy!!!

flatso

Has anyone seen the recommended shift points in the owner's manual...it's pretty funny. Try to shift at those speeds sometime.

grogiefrog

The MT is an AT with being able to do 40 in first. This covers a lot of city driving!

NickG

Thanks for the info. 68mph in second? ...now THAT's COOL!

grogiefrog

Now where does the AT shift?

red_rx8_red_int

I think the first three are right on, I hit 41 twice today in first, and 68 for second and 94 for third sound exactly right from memory. Have not tried 4th 5th or 6th. Really never drive in 6th unless on a road trip, put in 6th and set cruise control to 85. In my daily cummute I typically drive in 4th until around 80-85 depending on traffic.

idle0ne

wont driving in 4th doing that fast and never hitting 5th or 6th burn gas faster?

StealthTL

iTrader: (1)

They sound right, I have had the buzzer going, in 5th, which is relatively qiuck....

The Japanese spec cars have a limiter (138mph, if I recall)
but there is NO limiter on the US model. Someone posted that on a dyno they took it to 178mph, indicated.

S

red_rx8_red_int

I'm sure it does. I typically get about 15 mpg. I tried a couple of times to drive granny style (use the shift points in the manual) but can never go through a tank doing it. For example, I'll fill up making a mental note to try to drive conservatively for this tank of gas, and end up peeling out from the gas station. The FUN factor is just too much. I've given up trying to maximize my mpg for a while. Maybe if there's snow on the ground for a complete tank period I might find out the best mpg I can get. But for right now I don't care, I have almost 10k on the car and still concentrate on fun, not best mpg.

beachdog

There was a prior posting about this and a reference to a website with a speed in gear calculator. Here's the website:
http://rogerlarsen.home.comcast.net/ratio.html

Here's the calc it gives for 9000k

1. Accelerating to: 9000 rpms gives a speed of: 40.37 mph..
2. at 5431. rpms. Accelerating to: 9000 rpms gives a speed of: 66.91 mph..
3. at 6524. rpms. Accelerating to: 9000 rpms gives a speed of: 92.29 mph..
4. at 6494. rpms. Accelerating to: 9000 rpms gives a speed of: 127.90 mph..
5. at 7582. rpms. Accelerating to: 9000 rpms gives a speed of: 151.82 mph..
6. at 7587 rpms. Accelerating to: 9000 rpms gives a speed of: 180.09 mph..


--------------------------------------------------------------------------------
Disclaimer .. The results of this calc is based upon the stock tire diameter reported by
bridgestone (25.7 inches). The ratio on the differential is calculated to 4.5589:1 based
on 3750 rpms at 75 mph. The gear ratios are off the rx8 specs:
1. 3.76
2. 2.269
3. 1.645
4. 1.187
5. 1
6. 0.843

The calc does not use wind resistance and/or other external factors when calculating the results.

red_rx8_red_int

Nifty calculator. The rev limiter is above 9000, so I punched in 9200 and got the following results.

1. Accelerating to: 9200 rpms gives a speed of: 41.27 mph..
2. at 5551. rpms. Accelerating to: 9200 rpms gives a speed of: 68.39 mph..
3. at 6669. rpms. Accelerating to: 9200 rpms gives a speed of: 94.34 mph..
4. at 6638. rpms. Accelerating to: 9200 rpms gives a speed of: 130.74 mph..
5. at 7750. rpms. Accelerating to: 9200 rpms gives a speed of: 155.19 mph..
6. at 7755. rpms. Accelerating to: 9200 rpms gives a speed of: 184.09 mph..

beachdog

Looking back at this calculation, it reminds me that i was certain that I had shifted into 3rd at 70mph with the rev buzzer going during my road test. Haven't done this in my own yet.

red_rx8_red_int

It's been posted someplace here that the Renesis has actually been tested to be somewhat reliable at 12k rpm! The following is the result gotten when 12000 is punched in to that calculator (note this clearly ignores many factors):

1. Accelerating to: 12000 rpms gives a speed of: 53.83 mph..
2. at 7241. rpms. Accelerating to: 12000 rpms gives a speed of: 89.21 mph..
3. at 8699. rpms. Accelerating to: 12000 rpms gives a speed of: 123.05 mph..
4. at 8658. rpms. Accelerating to: 12000 rpms gives a speed of: 170.53 mph..
5. at 10109. rpms. Accelerating to: 12000 rpms gives a speed of: 202.42 mph..
6. at 10116 rpms. Accelerating to: 12000 rpms gives a speed of: 240.12 mph..

sferrett

Well here's me at the top of 4th gear last weekend - unfortunately the flash reflected off the spedo and I didn't have the presence of mind to look at the preview (ugh - just taking the photo was ridiculous enough).

Anyhow - I think the speedo was reading something like 131...

Gord96BRG

If you're looking up transmission gear ratios, why wouldn't you just grab the differential gear ratio while you're at it?? The diff ratio is 4.444:1, no need to back-calculate it.

Regards,
Gordon

gingersrus

I could swear I see the fuel gauge moving down, and it's a STILL PHOTO!

WOW! You guys are crazy!

(Not a flame, just an expression of amazement from a much more conservative driver.)

Jump120MPH

I got up to 141 mph in 5th..it was time to shift.

Rambling Man

Cool thread. On a test drive I had it to 88 in third and barely cracked 6,000 RPM. I've never seen a car harder to redline.

mamccubbin

No limiter on the US model? I am pretty sure it is limited to 148.