Speed Governor
#4
Get in ma belly!!
Join Date: Aug 2004
Location: Dallas, Texas
Posts: 955
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Omicron
Nope, it's programmed into the PCM/ECU. However, many members have gotten the car up to around 150 MPH... :D
Be safe. Don't overdrive yourself or the car. Better be alive than have a cool story to tell!!
- Irish
![Cool](https://www.rx8club.com/images/smilies/cool.gif)
#6
Bummed, but bring on OU!
Could buy an ecu from ..i think it is Knight Sports.. in Japan, they advertise one that removes the limiter (may be meant for the AT, i didn't think the US 6-speed had a limiter)
#7
black RX-8 6 speed
Join Date: Aug 2004
Location: Tampa, FL
Posts: 183
Likes: 0
Received 0 Likes
on
0 Posts
official top speed for the manual is 145. i've had it to 143. i think i would need something to create more downforce on the front if i were to consistantly run at those speeds. at about 130 or so i could feel the car getting light in the steering. nothing i couldn't handle but light none the less. i don't know if the manual has a limiter or not but i think the engine had another 10 or 15 in it.
#8
Originally Posted by bigblockbeater
official top speed for the manual is 145. i've had it to 143. i think i would need something to create more downforce on the front if i were to consistantly run at those speeds. at about 130 or so i could feel the car getting light in the steering. nothing i couldn't handle but light none the less. i don't know if the manual has a limiter or not but i think the engine had another 10 or 15 in it.
However, since its not gearing alone, the car does not have enough horsepower to go faster than about 162mph. The manual is electronically limited to 148mph at what should be 7650rpm. Any additional downforce would only reduce the possibility of reaching 162mph, so light or not it wouldn't do more than 162 in current trim.
There is one more thing that tends to have an affect on your top speed run...If the oil temp, coolant temp, or exhaust temps are too high, the ECU automatically reduces power to reduce heat. This has not been considered in a number of dynos I have seen where there is insufficient airflow to keep the engine cool. The RX8 ECU does alot of different things to keep from running any hotter than it already does. Air/Fuel Mixture, Ignition timing, etc are all changed based on these factors. Unfortunately, very significantly.
#10
Registered User
Join Date: Apr 2004
Location: Durham, NC
Posts: 60
Likes: 0
Received 0 Likes
on
0 Posts
What would be the motivation for going over 148 MPH. Just wondering. Why would it be worth all of the trouble
1. racing?
2. that 155 MPH jaunt every once in a while instead of 148 :-) (sarcastically)?
3. just the satisfaction of knowing you weren't limited(this would be my vote even though it would be pretty useless)
1. racing?
2. that 155 MPH jaunt every once in a while instead of 148 :-) (sarcastically)?
3. just the satisfaction of knowing you weren't limited(this would be my vote even though it would be pretty useless)
#11
Registered
And if anyone is wondering why Mazda picked a strange random number like 148 (mph)... they didn't. They picked 240 km/h, which just happens to equate to ~148 mph.
The German manufacturer's "gentleman's agreement" followed by BMW, Mercedes, Audi, and VW, is to limit top speeds to 250 km/h, which equals ~155 mph.
Nonsense - in the right (safe) conditions, 105 is absolutely safe. If you're doing it through heavy traffic that is moving much slower, if the road conditions (curves, bumps, sight lines, etc) are too tight, if the road surface is wet or slippery (or gravel
), if the vehicle is not capable of travelling safely at those speeds, then it isn't safe. But on a relatively light traffic, fast moving road designed for high speeds (like, say, sections of the Autobahn or US interstates), in a good car, then 105 is perfectly safe. Don't fall for the overwhelming propoganda pushed by bureaucratic agencies with other agendas that trumpet "speed kills". In itself, it doesn't - it's the sudden stops that kill. Properly managed and in appropriate circumstances, there is absolutely nothing wrong with highway speeds in excess of 100 mph. That's why the Autobahn fatality rates are no higher than North American highway fatality rates. Speed doesn't kill, 100+ mph can be perfectly safe.
Regards,
Gordon
The German manufacturer's "gentleman's agreement" followed by BMW, Mercedes, Audi, and VW, is to limit top speeds to 250 km/h, which equals ~155 mph.
Originally Posted by 9G Redline
even though 105 isn't exactly safe anyway. :p
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
Regards,
Gordon
Last edited by Gord96BRG; 12-13-2004 at 09:39 PM.
#12
Not so Super right now
Join Date: May 2003
Location: Beyond that there swamp.
Posts: 1,493
Likes: 0
Received 0 Likes
on
0 Posts
Let loose on a dyno I saw 175MPH on the speedo at 9000RPM in 6th. On the actual road I've taken it to 142 and didnt have a lot behind it at that speed (I am a bit chunky though)
#14
good for clothes too ;-)
Join Date: Sep 2004
Location: Toronto, ON
Posts: 210
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Gord96BRG
And if anyone is wondering why Mazda picked a strange random number like 148 (mph)... they didn't. They picked 240 km/h, which just happens to equate to ~148 mph.
The German manufacturer's "gentleman's agreement" followed by BMW, Mercedes, Audi, and VW, is to limit top speeds to 250 km/h, which equals ~155 mph.
Nonsense - in the right (safe) conditions, 105 is absolutely safe. If you're doing it through heavy traffic that is moving much slower, if the road conditions (curves, bumps, sight lines, etc) are too tight, if the road surface is wet or slippery (or gravel
), if the vehicle is not capable of travelling safely at those speeds, then it isn't safe. But on a relatively light traffic, fast moving road designed for high speeds (like, say, sections of the Autobahn or US interstates), in a good car, then 105 is perfectly safe. Don't fall for the overwhelming propoganda pushed by bureaucratic agencies with other agendas that trumpet "speed kills". In itself, it doesn't - it's the sudden stops that kill. Properly managed and in appropriate circumstances, there is absolutely nothing wrong with highway speeds in excess of 100 mph. That's why the Autobahn fatality rates are no higher than North American highway fatality rates. Speed doesn't kill, 100+ mph can be perfectly safe.
Regards,
Gordon
The German manufacturer's "gentleman's agreement" followed by BMW, Mercedes, Audi, and VW, is to limit top speeds to 250 km/h, which equals ~155 mph.
Nonsense - in the right (safe) conditions, 105 is absolutely safe. If you're doing it through heavy traffic that is moving much slower, if the road conditions (curves, bumps, sight lines, etc) are too tight, if the road surface is wet or slippery (or gravel
![Wink](https://www.rx8club.com/images/smilies/wink.gif)
Regards,
Gordon
I wish someone would do a study on slow drivers, had two of them today coming back to work going slower than the flow of traffic in the fast lane on the highway, whole line of cars had to overtake them to get by.
Granted the flow of traffic was 20 over the speed limit (kph), but that just goes to show that the speed limit is too low!
#16
I'm curious whether this will actually work on the 8 :
http://www.hksusa.com/products/?id=781&rsku=
"SLD - Speed Limit Defender
The HKS SLD is an electronic device that prevents the triggering of the factory speed limiter. SLD units are vehicle specific due to the unique electronic signals of each type of vehicle."
http://www.hksusa.com/products/?id=781&rsku=
"SLD - Speed Limit Defender
The HKS SLD is an electronic device that prevents the triggering of the factory speed limiter. SLD units are vehicle specific due to the unique electronic signals of each type of vehicle."
#17
Registered User
Join Date: Aug 2004
Location: Berkeley, CA
Posts: 430
Likes: 0
Received 0 Likes
on
0 Posts
150mph.!! hmm.... is that not fast enough for u?! honestly I have not reach the top speed yet.!! not even once..!! the fastest mph I reached was like 138mph..!! that's fast enough for me.!! and I don't really think there has some place around city can let u drive ur car up to top speed.!! even there has... I don't think that's a good idea to do that.. because in top speed 8 is very easy to lose control..!! also I believe if there happen some accident u die for sure .!! don't try that.!!
Thread
Thread Starter
Forum
Replies
Last Post
jasonrxeight
RX-8's For Sale/Wanted
2
09-30-2015 01:53 PM
Racingjunkie
Series I Wheels, Tires, Brakes & Suspension
2
09-29-2015 05:05 PM