What happens in the Nsx stays in the Nsx :biggrin:
What's the fastest you have driven your NSX?
- Thread starter mknmoves
- Start date
Steveny: I fully agree. Highways are a lot more fun without speed limits. And if you blow by a cop at that speed, it doesn’t matter. It’s legal!
Shawn110975: I have a 1991 USDM 3.0 liter 5-speed. If I don’t turn off the traction control, the car hits a kind of speed limiter at about 7500 rpm in fifth gear. If I turn the traction control off, the TCS failure light comes on instead at that speed and the car can accelerate further.
I don’t agree that the instrument cluster is more accurate than a sat nav. However, if you look at the rpm in the picture above and multiply that through with the gearing, you get to the same speed as is shown in the sat navs in posts #9 and #20.
I find that decent GPS devices do show the speed quite accurately when their antennas get a clear signal. Cellphones are typically not decent GPS devices. Apple iPhones, Sony Ericsson phones, etc. often use “assisted GPS” chipsets that can quickly determine your location to within 100 meters or so based on signals from cell phone towers, even if you’re indoors. However, the actual GPS portion of the receiver that sees the satellites is miserable. It seems to me that even a cloud passing overhead can cause them to go blind. And if they can’t accurately determine your position, they can’t accurately calculate your speed.
If you had a TomTom, Garmin, etc. device mounted on your windshield and the speed shown was usually 6 mph off compared to your instrument cluster, then I would suspect that your instrument cluster is off. If you got your GPS readings from a cellphone, then that may well be the cause of the discrepancy.
Shawn110975: I have a 1991 USDM 3.0 liter 5-speed. If I don’t turn off the traction control, the car hits a kind of speed limiter at about 7500 rpm in fifth gear. If I turn the traction control off, the TCS failure light comes on instead at that speed and the car can accelerate further.
I don’t agree that the instrument cluster is more accurate than a sat nav. However, if you look at the rpm in the picture above and multiply that through with the gearing, you get to the same speed as is shown in the sat navs in posts #9 and #20.
I find that decent GPS devices do show the speed quite accurately when their antennas get a clear signal. Cellphones are typically not decent GPS devices. Apple iPhones, Sony Ericsson phones, etc. often use “assisted GPS” chipsets that can quickly determine your location to within 100 meters or so based on signals from cell phone towers, even if you’re indoors. However, the actual GPS portion of the receiver that sees the satellites is miserable. It seems to me that even a cloud passing overhead can cause them to go blind. And if they can’t accurately determine your position, they can’t accurately calculate your speed.
If you had a TomTom, Garmin, etc. device mounted on your windshield and the speed shown was usually 6 mph off compared to your instrument cluster, then I would suspect that your instrument cluster is off. If you got your GPS readings from a cellphone, then that may well be the cause of the discrepancy.
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A parsec is a unit of length or distance. The Kessel Run is typically an 18 parsec route. So saying you made it in 12 parsecs doesn't indicate a speed, but rather that you found a shorter route. [/NERDING] :tongue::biggrin::tongue::biggrin:
I know that (Gandy) bridge well. Its an excellent spot for this sort of thing.
Not that I condone street racing.
I've barely gone 100 mph. I hate tickets and that keeps me from going faster.
shawn110975
Suspended
S14_TAT actually YES all those runs were with the TCS ON. I didnt think that really did anything I mean at top speeds. something for me to think about. Might have to try it out one night while im dreaming. LOL
Green Beret Wow. I didnt know that. so your telling me if the tractio control is off that the car can get those extra MPH? I did not know that.
also you said that if the TCS is off, when you get to those speeds then its blinks or shots an error. my question is after returning to normal speeds does the TCS error go away?
Green Beret Wow. I didnt know that. so your telling me if the tractio control is off that the car can get those extra MPH? I did not know that.
also you said that if the TCS is off, when you get to those speeds then its blinks or shots an error. my question is after returning to normal speeds does the TCS error go away?
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win!
i have taken my NSX as far as 130...on a closed course under the direct supervision of professionals. Remember, always wear your seatbelt! :biggrin:
I top out third routinely and just get into fourth gear at T-hill in Willows CA, not the top speed of the car for sure, but it does raise questions when you're coming into turn one
Best I've done is 56 mph - which was in reverse backing out of my driveway.... :biggrin:
shawn110975
Suspended
JayBird We have a winner. bling bling bling bling. fireworks and all that..
LOL reverse LOL
LOL reverse LOL
65 mph on the 101 South from San Francisco to San Jose.
What can the hoverround do on the 101 shoulder?
If you happen to have this dream when this thread is still active, please post your results. =)
Did 130 mph in my '96 NA1 once. If anyone knows the road....... it was the new route 288 which connected the West End near Short Pump to the South Side (Midlothian) all of this near Richmond,VA. Funny thing, the guy I sold it to a few weeks back, also did 130 mph for a short burst when driving it home from NJ to Fla. :biggrin:
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That is a pretty sweet video. I believe you now. I have only done 120 and I track my car on road courses so it a little safer. I got my BMW 335 up to top speed which was in the 175ish range with the limiter taken off.
Hi,
100% on greenberet ... i once cutted fuel on 5th... at the time i did some math and it was like 307km/h real speed (190.7mph)..
the rpm tach showed like 8100rpms, where every gear cuts off, and the speedo passed the 300km/h mark, arround where the 320km/h would be...i looked at it real fast...
The engine did cut with the same behaviour as if it was cutting 3rd or 4th, which surprised me, because i thought that at those speeds, the engine hability to revup again against the fuel cut would be slower.
mod wise:
- CF AIS (came with the car, don't know which brand)
- K&N Filter in OEM airbox
- no cats
Thanks,
Nuno
PS - it was a slight downhill, at arround 2am and only passed 1 car in about 50km... excelent highway (way better than autobahn:wink
100% on greenberet ... i once cutted fuel on 5th... at the time i did some math and it was like 307km/h real speed (190.7mph)..
the rpm tach showed like 8100rpms, where every gear cuts off, and the speedo passed the 300km/h mark, arround where the 320km/h would be...i looked at it real fast...
The engine did cut with the same behaviour as if it was cutting 3rd or 4th, which surprised me, because i thought that at those speeds, the engine hability to revup again against the fuel cut would be slower.
mod wise:
- CF AIS (came with the car, don't know which brand)
- K&N Filter in OEM airbox
- no cats
Thanks,
Nuno
PS - it was a slight downhill, at arround 2am and only passed 1 car in about 50km... excelent highway (way better than autobahn:wink
shawn110975: If you turn the traction control off and then drive fast enough for the TCS failure light to come on, that yellow light will stay on even when you slow down again. Turn off the ignition once, the system will reset, and all will be back to normal.
If you leave the traction control on, if I remember correctly, the green traction control light does not blink when it’s acting as a speed limiter. That made it harder to find what was causing the “speed limiter” effect. I spoke with the guy who programmed my EMS chip, sent it to Comptech for their chip guy to look over, put my car on a dyno to check out the fuel pressure at max rpm, etc. And it turned out there is no speed limiter in the EMS – it’s in the traction control.
UnhuZ: Driving downhill, when my car runs into the redline in fifth, it’s a sharp brap-brap-brap kind of cutout. Just like in the lower gears. The TCS cutout feels softer to me.
If you leave the traction control on, if I remember correctly, the green traction control light does not blink when it’s acting as a speed limiter. That made it harder to find what was causing the “speed limiter” effect. I spoke with the guy who programmed my EMS chip, sent it to Comptech for their chip guy to look over, put my car on a dyno to check out the fuel pressure at max rpm, etc. And it turned out there is no speed limiter in the EMS – it’s in the traction control.
UnhuZ: Driving downhill, when my car runs into the redline in fifth, it’s a sharp brap-brap-brap kind of cutout. Just like in the lower gears. The TCS cutout feels softer to me.
greenberet, I really enjoyed that video, thank you. And yes, when GPS has access to several satellites like on a dash or out in the open on a boat, the speed is very accurate. I use GPS on my boat to see how modifications affect top speed.
greenberet, is your exterior completely stock including the rear wing? I'm curious as to how the car felt at top speed. Did the steering feel light? Did the car feel pretty calm and planted?
Did the side windows bulge out (due to pressure differential between inside and outside). Did any gaps appear in any of the window seals? I would be curious as to how tight the T-top is at those speeds, anybody have a "dream" about that speed in their T-top NSX?
I remember driving my 1990 Talon 145MPH and popping up the headlights to see how that affected aerodynamics at that speed. It would cause the outside mirrors to violently shake, and these are mirrors that feel very solid at rest! They are directly attached to the car, not out on an arm like the NSX. Were your outside mirrors shaking at all at that speed? (on the autobahn you constantly have to be watching for faster cars behind you)
greenberet, is your exterior completely stock including the rear wing? I'm curious as to how the car felt at top speed. Did the steering feel light? Did the car feel pretty calm and planted?
Did the side windows bulge out (due to pressure differential between inside and outside). Did any gaps appear in any of the window seals? I would be curious as to how tight the T-top is at those speeds, anybody have a "dream" about that speed in their T-top NSX?
I remember driving my 1990 Talon 145MPH and popping up the headlights to see how that affected aerodynamics at that speed. It would cause the outside mirrors to violently shake, and these are mirrors that feel very solid at rest!
They are directly attached to the car, not out on an arm like the NSX. Were your outside mirrors shaking at all at that speed? (on the autobahn you constantly have to be watching for faster cars behind you)
Hi,
precisely... when the TCS is on, i can't really feel nothing when 280km/h arrives... it just stop to accelerate...this on a flat road..downhill, i can actually feel the limiter trying to decelerate so the speed is mantained...
Nuno
precisely... when the TCS is on, i can't really feel nothing when 280km/h arrives... it just stop to accelerate...this on a flat road..downhill, i can actually feel the limiter trying to decelerate so the speed is mantained...
i have 100% stock aerodynamics, and yes, at these speeds, the car is glued to the road... i tested some high speeds corners... like 200km/h, then going back and do the same corner at 230km/h, then 260km/h and the more speed, more glued the car was.....that is one thing i admired... the aerodynamics are so well achieved, even in stock form, that the car feels secure to drive... even with slight corrections to the steering wheel, like changing lanes, you can't feel it float due to speed and weight...M Baker said:
mine didn't even shake at all, regardless of the speed... only a slight vibration visible on the hood.. it raised a bit at the side gaps to the fenders.
Nuno
M Baker: … what UnhuZ said. An NSX is very stable at top speed and the outside mirrors don’t shake. When the video was shot, my alignment was slightly off. I had one of the rear CV joint boots replaced and the shop didn’t realign the suspension afterwards. At high speed, the car then pulled to the right when I got off the gas - as you can see in the video. But if the suspension is aligned, the car is very stable at high speeds. Unlike UnhuZ, I haven’t seen my front hood vibrate or raise up at all.
No, my exterior is not completely stock. As you can kind of see in the picture below, I have a 2002+ trunk lip spoiler mounted beneath the stock rear wing and my car has undertrays to make the bottom smooth. You can find information about the trunk lip underspoiler here, the front undertray here, the fuel tank undertray here, and the rear undertray/diffuser here.
If the windows are aligned correctly using the procedure in the service manual, they don’t get sucked away from their seals and the wind noise is like in the video. If the windows are not aligned properly, then yes, they can get sucked away from their seals and you can get a lot of wind noise all of a sudden. From what I’ve heard, wind noise is more difficult to get under control in an NSX-T than in a coupe like mine.
Hope that helps!
No, my exterior is not completely stock. As you can kind of see in the picture below, I have a 2002+ trunk lip spoiler mounted beneath the stock rear wing and my car has undertrays to make the bottom smooth. You can find information about the trunk lip underspoiler here, the front undertray here, the fuel tank undertray here, and the rear undertray/diffuser here.
If the windows are aligned correctly using the procedure in the service manual, they don’t get sucked away from their seals and the wind noise is like in the video. If the windows are not aligned properly, then yes, they can get sucked away from their seals and you can get a lot of wind noise all of a sudden. From what I’ve heard, wind noise is more difficult to get under control in an NSX-T than in a coupe like mine.
Hope that helps!
UnhuZ, is the exterior completely stock, no underbody or other modifications?
BTW, thanks for all the documentation greenberet, I read all the links - very interesting. The 2002+ trunk lip spoiler makes complete sense, and I can see adding a front underbody cover - both of those are easy. I am watching to see how the rear undertray works out as you study the airflow.
My E30 M3 was designed with underbody panels right from the factory - the rear of the car is pretty flat and tightly connected to the rear bumper lip. It's impressive to see what they did back in the late 1980's right from the factory and more so when you use the 1991 E30 M3 EVO front undertray.
shawn110975
Suspended
I watched this video it was in japanese (sub title in english) and they were explaining that the cars design is the faster you go the more stable it actually is, and this was the designer of the NSX, he said that at 130mph is actually more stable than 60 mph. this was the designer. I will see if i can find the video.
the one post saying it didnt feel stable and he let off the gas. was his car maybe his tires were not balance or an after market bumper.
the one post saying it didnt feel stable and he let off the gas. was his car maybe his tires were not balance or an after market bumper.
Hi,
relatively to a 100% stock NSX as they left the factory, what the car have is:
- removed both front fog lights
- the car already had an CF AIS and no vent grill on it
- 02+ wheels now (oem 16/17 when that 5th fuel cutoff happened)
so, as you see, nothing that would positively or negatively affect it's aerodynamics... go to my build thread to see photos :wink:
Thanks,
Nuno
relatively to a 100% stock NSX as they left the factory, what the car have is:
- removed both front fog lights
- the car already had an CF AIS and no vent grill on it
- 02+ wheels now (oem 16/17 when that 5th fuel cutoff happened)
so, as you see, nothing that would positively or negatively affect it's aerodynamics... go to my build thread to see photos :wink:
Thanks,
Nuno
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