Quantitative/relevant technical information re: Top Speed governor
02-17-2011, 02:26 PM
#1
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Quantitative/relevant technical information re: Top Speed governor
I was wondering if anyone had any quantitative or otherwise relevant technical information/data regarding the 5th gen top speed governor.
I know from experience in searching around that the 00-01's are different than the 02-03's due to their ECU differences, but have yet to definitively verify if some models have higher governors than others, i.e. early production 02's vs late model 03's.
I'm also aware that all car companies sometimes dictate their speed limiters/governors with respect to the speed rating on the factory tire.
I also realize that some production car speedometers are inaccurate, and realize that when dictating actual top speed governors, other means of data collection should be required. (i.e. GPS, dyno, etc.)
I know from experience in searching around that the 00-01's are different than the 02-03's due to their ECU differences, but have yet to definitively verify if some models have higher governors than others, i.e. early production 02's vs late model 03's.
I'm also aware that all car companies sometimes dictate their speed limiters/governors with respect to the speed rating on the factory tire.
I also realize that some production car speedometers are inaccurate, and realize that when dictating actual top speed governors, other means of data collection should be required. (i.e. GPS, dyno, etc.)
Last edited by NmexMAX; 02-23-2011 at 02:07 PM.
02-17-2011, 02:48 PM
#4
its like 138 on autos and 158 on 6spds.
I THINK, Aaron's 3rd gen had a auto ecu and when dyno tuning they where hitting the speed limiter, so he switched to the 6sped ecu, for a few other reasons too
I THINK, Aaron's 3rd gen had a auto ecu and when dyno tuning they where hitting the speed limiter, so he switched to the 6sped ecu, for a few other reasons too
02-17-2011, 02:55 PM
#5
Yeah I don't remember TS saying only the A/T had speed limiters.....I believe both had them.....but maybe different values...I remember reading that the speed limiter was 142 mph for all 5.5th gens according to a Sport Compact Car article comparing a 03 3.5 SE Altima 5spd to the 03 Maxima 6 spd......
Last edited by CMax03; 02-17-2011 at 02:58 PM.
02-17-2011, 03:54 PM
#7
02-17-2011, 04:42 PM
#10
http://forums.maxima.org/7441318-post1100.html
a utec will not remove the speed limiter.
John you probably seen that speed but the speedo gauge is usually not very accurate, and depending on your wheel size n such.
a utec will not remove the speed limiter.
John you probably seen that speed but the speedo gauge is usually not very accurate, and depending on your wheel size n such.
fair enough
02-17-2011, 05:04 PM
#12
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http://forums.maxima.org/7441318-post1100.html
a utec will not remove the speed limiter.
John you probably seen that speed but the speedo gauge is usually not very accurate, and depending on your wheel size n such.
a utec will not remove the speed limiter.
John you probably seen that speed but the speedo gauge is usually not very accurate, and depending on your wheel size n such.
02-17-2011, 06:16 PM
#13
the ecu only gets a speed signal from the gauge cluster, the gauge cluster gets it from ABS system.
Their is no speed sensor in 5.5 gen 6spd transmission.
02-17-2011, 06:52 PM
#16
^ no, so i guess in theory our speedometers will show the same no matter what tires/wheel size we have? Even though if we do have different sizes we are actually going a different speed.
hmmmm
hahahahh
hmmmm
hahahahh
02-17-2011, 07:36 PM
#17
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Yep, speedometer will show the same at each RPM in each gear, regardless of tire size. Could throw some tiny 22" tires on there and peg it, but actually be going like 135 lol
02-18-2011, 07:18 AM
#22
So that brings up a good point... Does the ECM adjust for the inherent inaccuracy of the speedometer and uses an algorithm to limit the car to 130 actual, even if that's 133 or 135 on the speedometer? As far as I can tell, my speedometer is accurate up to at least 90. This goes against all the other cars I drive (Fords and Toyotas), as they all are adjusted to have the speedometer read 2 or 3 miles per hour faster than what you're actually driving. I just assumed all manufacturers did this to help with speeding-related accidents, people THINK they are speeding more than they actually are.
02-18-2011, 12:21 PM
#23
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I havent stretched the legs of my 2000 yet, but with my 4th gen 5-speed, there is a fuel cutoff on the GXE models at 117.We had a very simple fix for that, by finding the correct wire to the speedo and installing a switch. When you wanted to go past the limiter, you hit the switch and you could go past. When you were done, hit the switch again to turn it back on. If you left it off you'd get a CEL.
02-18-2011, 07:15 PM
#24
Sometimes it is drag limited. With the automatic 5.5 gens, I believe the ECU simply closes the throttle body enough to maintain 130 mph.
02-18-2011, 09:41 PM
#25
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'01 Max SE 5-spd... Top is just under 145 - AZ, NM have plenty of open space, but AZ is putting speed-cams on their highways now.
Can't speak to other years/models, but in '01 speed was governed to the quality of tires the car was sold with. The SEs w/17in "V" (150 mph) tires were ungoverned. Friction and drag limit the '01 SE's speed to abt 143 in 5th gear long before the tach hits red-line. Other models sold with "H" (130mph) tires were governed at 130mph. If they sold cars capable of speeds faster than the original tire rating, they'd be sued if tires failed at over that rated speed. As the '01 SEs also have added torsion bars for better handling, it may have been the only ungoverned model.
...edited to say "H" vice "W" in orig as per other's correction...
Can't speak to other years/models, but in '01 speed was governed to the quality of tires the car was sold with. The SEs w/17in "V" (150 mph) tires were ungoverned. Friction and drag limit the '01 SE's speed to abt 143 in 5th gear long before the tach hits red-line. Other models sold with "H" (130mph) tires were governed at 130mph. If they sold cars capable of speeds faster than the original tire rating, they'd be sued if tires failed at over that rated speed. As the '01 SEs also have added torsion bars for better handling, it may have been the only ungoverned model.
...edited to say "H" vice "W" in orig as per other's correction...
Last edited by Oldnewbie; 02-24-2011 at 06:10 AM. Reason: Correct error in "W" tire speed - chg to "H"
02-19-2011, 12:36 AM
#26
'01 Max SE 5-spd... Top is just under 145 - AZ, NM have plenty of open space, but AZ is putting speed-cams on their highways now.
Can't speak to other years/models, but in '01 speed was governed to the quality of tires the car was sold with. The SEs w/17in "V" (150 mph) tires were ungoverned. Friction and drag limit the '01 SE's speed to abt 143 in 5th gear long before the tach hits red-line. Other models sold with "W" (130mph) tires were governed at 130mph. If they sold cars capable of speeds faster than the original tire rating, they'd be sued if tires failed at over that rated speed. As the '01 SEs also have added torsion bars for better handling, it may have been the only ungoverned model.
Can't speak to other years/models, but in '01 speed was governed to the quality of tires the car was sold with. The SEs w/17in "V" (150 mph) tires were ungoverned. Friction and drag limit the '01 SE's speed to abt 143 in 5th gear long before the tach hits red-line. Other models sold with "W" (130mph) tires were governed at 130mph. If they sold cars capable of speeds faster than the original tire rating, they'd be sued if tires failed at over that rated speed. As the '01 SEs also have added torsion bars for better handling, it may have been the only ungoverned model.
02-20-2011, 07:04 AM
#27
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yea. my bro's old 02 max did 7500 rpm on rev limiter on sss, today his 05 max us normal rev limiter, because he not want to use on it, but he still to use remove governor speed limiter.
you insulting @ me, sparks03max and other stilling to do that on me. because im honest to them about remove governor, other threads. ok well.
you insulting @ me, sparks03max and other stilling to do that on me. because im honest to them about remove governor, other threads. ok well.
Just give up the lying and be yourself and maybe you won't be disliked so much around here.
02-21-2011, 06:03 PM
#29
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No 5.5 gen auto is going past 130 period, 5.0 gens SE auto's can although.......as Scott showed with GPS it (5.5 gen auto) just shuts down even though it has more ooomph in it the ECU says no way and just cuts the fuel flow. Did it going to Houston on 45 on a empty stretch, once it hit 130 game over. 6spds will get in the mid/high 140's no prob on long stretches, hell even the 5spd 5th and 4th gens will get to low 140's.
02-23-2011, 02:55 AM
#30
If someone really would like a definitive answer on this, I would suggest simply running a 5.5 gen 6MT on the dyno in 5th gear. Depending on the wheel size, it should hit about 165 mph (at 6600 rpm). imo if it is not electronically limited before then, it isn't at all. According to my calculations, if you were to actually drive 165 mph, you'd need at least 240 whp. I can provide my calcs upon request...
02-23-2011, 10:05 AM
#33
I think there are a couple of us who have 
But the couple people I know of has TS ECU's. Mine went to 7K in 3rd, and that was about 135 or so. IIRC SR20DEN went past 140. (lemme check on that from either his older posts or his older dynos that I have) *Edit: http://forums.maxima.org/dyno-discus...tup-today.html
The "rule of thumb" is that 02+ AT's have "soft" limiters at about 130, and I believe the 6MT's were not limited. I thought they were, but according to knight, they are not .
Again, this is better to do on a non load based dyno, since whp REALLY becomes a factor at those speeds, and well, these are only Maximas afterall, and who cares what roads are isolated from which mile marker to which mile marker.
1.) Our tachs and speedo's are off
2.) Dynojet software is the safest and most accurate way to go, WRT MPH & RPM
3.) Ahh, w/e
But the couple people I know of has TS ECU's. Mine went to 7K in 3rd, and that was about 135 or so. IIRC SR20DEN went past 140. (lemme check on that from either his older posts or his older dynos that I have) *Edit: http://forums.maxima.org/dyno-discus...tup-today.html
The "rule of thumb" is that 02+ AT's have "soft" limiters at about 130, and I believe the 6MT's were not limited. I thought they were, but according to knight, they are not .
Again, this is better to do on a non load based dyno, since whp REALLY becomes a factor at those speeds, and well, these are only Maximas afterall, and who cares what roads are isolated from which mile marker to which mile marker.
1.) Our tachs and speedo's are off
2.) Dynojet software is the safest and most accurate way to go, WRT MPH & RPM
3.) Ahh, w/e
02-23-2011, 01:14 PM
#35
02-23-2011, 01:32 PM
#37
02-23-2011, 01:59 PM
#38
I think you might have rev limiter and speed limiter confused. SR was smart enough to try 5th gear, and ahh, it theoretically goes a bit passed 151. He never mentioned the RPM he was at, but I'm guessing it wasn't even near the rev limiter.
Last edited by NmexMAX; 02-23-2011 at 02:17 PM.
02-23-2011, 02:02 PM
#39
http://www.texasmile.net/
Our cars would probably be in the 130 mph class.
Have a friend with a twin turbo Ford GT who went 219, 223 and 224 before blowing a hole in a piston. Considering he'd been pushing 1000 hp through the otherwise stock engine for two years, the motor held up well. Car should be back together before summer, more boost, more displacement, headwork and different engine management. He's looking for 1400-1500 hp and 235-240 mph.
Hardest pulling car I've ever been in. At 160, it has more punch than my car does at 20. We did a 50 mph roll-on and hit 160 in about 8 seconds. With that engine, he's putting 20 mph on a Bugatti Veyron in the standing mile! Can't wait for a ride in it with the new engine.
02-23-2011, 02:09 PM
#40
Have a friend with a twin turbo Ford GT who went 219, 223 and 224 before blowing a hole in a piston. Considering he'd been pushing 1000 hp through the otherwise stock engine for two years, the motor held up well. Car should be back together before summer, more boost, more displacement, headwork and different engine management. He's looking for 1400-1500 hp and 235-240 mph.
Hardest pulling car I've ever been in. At 160, it has more punch than my car does at 20. We did a 50 mph roll-on and hit 160 in about 8 seconds. With that engine, he's putting 20 mph on a Bugatti Veyron in the standing mile! Can't wait for a ride in it with the new engine.
Hardest pulling car I've ever been in. At 160, it has more punch than my car does at 20. We did a 50 mph roll-on and hit 160 in about 8 seconds. With that engine, he's putting 20 mph on a Bugatti Veyron in the standing mile! Can't wait for a ride in it with the new engine.