Top speed on auto
04-13-2005 | 08:42 PM
#6
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Originally Posted by TxRx8
I dont know how, but I seen it! :D
Everything I have heard limits the auto to 125 as you mentioned. I have not seen anything to suggest manual mode gets you any more.
Last edited by BlueEyes; 04-13-2005 at 08:51 PM.
04-14-2005 | 07:27 AM
#10
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From: boston
topped out.. not yet but close
i got my manual up to 167... that was prior to the turbo,...which all my other mods will be on in four days... but at that speed driving on a highway, i hit a bump, and literally skipped a lane.... but i plan after the mods to take it to a track...
04-14-2005 | 07:30 AM
#11
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From: Planet Earth
Now fella's...we all got ***** here...lol
Yeah, 184 without wind resistance does not mean much. I wish we could test an 8 without the limiter holding it back at 148mph. I know I've heard of it reaching 150HP in 5th gear but apparently 6th gear has a limiter.
I was just wondering...wait a sec, how did it get that on the dyno if the limiter should have kicked in at 148???
Yeah, 184 without wind resistance does not mean much. I wish we could test an 8 without the limiter holding it back at 148mph. I know I've heard of it reaching 150HP in 5th gear but apparently 6th gear has a limiter.
I was just wondering...wait a sec, how did it get that on the dyno if the limiter should have kicked in at 148???
04-14-2005 | 10:35 AM
#12
Made Paid & Laid
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From: SOUTH DAKOTA (NOT BY CHOICE)
I got my first 8 which was an auto up to 141mph shifting myself
125 is the speed limit for the cruise control
by the way no one asked what the 6 speed can do just the auto
125 is the speed limit for the cruise control
by the way no one asked what the 6 speed can do just the auto
Last edited by RAGE91169; 04-14-2005 at 10:38 AM. Reason: add info
04-14-2005 | 10:42 AM
#13
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I have a very hard time believing that a car with 192 horsepower at the crank is capable of 141 mph and a car with 238 is capable of 160 +. You guys must have been going down a mountain, it just doesn't add up.
Last edited by BlueEyes; 04-14-2005 at 10:46 AM.
04-14-2005 | 10:44 AM
#14
RX8 and a Truk....
Joined: Nov 2004
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From: OKC
Originally Posted by rx8wannahave
Now fella's...we all got ***** here...lol
Yeah, 184 without wind resistance does not mean much. I wish we could test an 8 without the limiter holding it back at 148mph. I know I've heard of it reaching 150HP in 5th gear but apparently 6th gear has a limiter.
I was just wondering...wait a sec, how did it get that on the dyno if the limiter should have kicked in at 148???
Yeah, 184 without wind resistance does not mean much. I wish we could test an 8 without the limiter holding it back at 148mph. I know I've heard of it reaching 150HP in 5th gear but apparently 6th gear has a limiter.
I was just wondering...wait a sec, how did it get that on the dyno if the limiter should have kicked in at 148???
Right - that proves the car is not 'electronically-limited' to 148. It proves the car has NO electronic speed limiter.
04-14-2005 | 05:31 PM
#17
Bummed, but bring on OU!
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From: Charleston, SC
the power required to get from 140-160mph is much much higher than the power required to get from 120-140mph. it's just not linear. (assuming the same drag coefficient). only had my auto to 120's in third, whatever that top's out at. I don't remember, it's been a while.
04-14-2005 | 09:39 PM
#19
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From: Puyallup, WA
I'm going to say that the 167 was downhill. I did the stupid thing once and topped it out in fifth(150) and that was with a slight down hill....the car didn't have the power to go much faster if I had decided to switch to sixth.
04-14-2005 | 09:44 PM
#20
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From: SOUTH DAKOTA (NOT BY CHOICE)
I Did Not Top Out I Was Only At 6100 Rpms In 4th I Dont Think I Could Go Any Faster And Cops In Rapid City Love That Red Little Car So Much They Stoped Me Twice A Month Just To Say Hi Your Going 4 Over The Speed Limit So I Stoped Pushing My Luck
04-16-2005 | 02:37 AM
#22
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238HP to the engine is not enough HP to hit 160mph guaranteed (on the RX8), I think I topped out at 154mph on my 94 RX7 with 255hp.
what's the coeff drag of the RX8 without the spoiler?
I would say the Auto8 can at best hit 140mph.
During high speed, the HP becomes exponential to keep up with the linear speed. Only two things matter for top speed on a flat windless road, the Coeff Drag and HP. Now the HP will have to be the actual RWHP which will have to account for the condition of the engine, ambient temp, moisture, air pressure, engine temp, fuel grade, and a lot more but I'm too dumb to think of it now. Hell it's 12:37am I'm going to sleep. This can even be done on paper and will actually be accurate.
what's the coeff drag of the RX8 without the spoiler?
I would say the Auto8 can at best hit 140mph.
During high speed, the HP becomes exponential to keep up with the linear speed. Only two things matter for top speed on a flat windless road, the Coeff Drag and HP. Now the HP will have to be the actual RWHP which will have to account for the condition of the engine, ambient temp, moisture, air pressure, engine temp, fuel grade, and a lot more but I'm too dumb to think of it now. Hell it's 12:37am I'm going to sleep. This can even be done on paper and will actually be accurate.
04-16-2005 | 04:40 PM
#23
RX8 and a Truk....
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From: OKC
Originally Posted by Dangrzne25
The top speed of a stock 6sp on a completely straight, windless road would be 152mph.
Also, according the the gear ratios listed on the mazda website and calculating a drag coefficent of .31, the RX-8 would require aproximately 970 HP to top out at 9000rpm in 6th gear for a top speed of 243.
(shrug)
04-16-2005 | 04:48 PM
#24
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sorry slight mis-calculation on the final drive ratio...looked funny to me too :D Would be 193 at 9000rpm in 6th.
And yes I meant assuming no head or tail wind on a flat road with coefficient of drag being .31 the 6sp would achieve 152 and the automatic 134. Obviously there are other things to consider but this would be fairly accurate based on the HP, gears, and coefficent of drag.
And yes I meant assuming no head or tail wind on a flat road with coefficient of drag being .31 the 6sp would achieve 152 and the automatic 134. Obviously there are other things to consider but this would be fairly accurate based on the HP, gears, and coefficent of drag.
04-16-2005 | 05:31 PM
#25
RX8 and a Truk....
Joined: Nov 2004
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From: OKC
Originally Posted by Dangrzne25
sorry slight mis-calculation on the final drive ratio...looked funny to me too :D Would be 193 at 9000rpm in 6th.
In 6th gear, so says abbid, every 1k rpms is 20mph.
And yes I meant assuming no head or tail wind on a flat road with coefficient of drag being .31 the 6sp would achieve 152 and the automatic 134. Obviously there are other things to consider but this would be fairly accurate based on the HP, gears, and coefficent of drag.