New wheels and tires
- Thread starter steveny
- Start date
I have to tell you all that my NSX is a 92 and put OEM spec 1999 wheels on it and Bridgestone NSX OEM tires. The TCS is affected and does come on during turns at certain radius at low or med speeds. Sometimes it comes on during accelaration on a straight away. I can only speculate that the computer is activating it b/c it is being fooled that there is wheels spin. I know we all know this... If we increase the tire size ie: the height, now it will take more revolutions right. Well those extra revolutions are being calculated as whell spin by the TCS system. I have to find a newer TCS head unit computer or upload the newer program, LOL.
Bad news! I was planning to go to late model OEM size wheels + OEM tires on my '93. I thiught the TCS was supposed to tolerate that degree of difference. I'd like to hear about your solution when you find it.
The computer does tolerate that degree of difference. I have a '91 NSX and have a set of the 16"/17" OEM wheels and tires, and haven't had any problems with the TCS. I know a bunch of other folks who have done the same thing with no problems.
I have to find a newer TCS head unit computer or upload the newer program, LOL.
Why does this make you laugh out loud (LOL)?
[This message has been edited by nsxtasy (edited 13 August 2001).]
I have to find a newer TCS head unit computer or upload the newer program, LOL.
Why does this make you laugh out loud (LOL)?
[This message has been edited by nsxtasy (edited 13 August 2001).]
Under hard exceleration in my stock 2000 my TCS kicks in big time when doing a 1,2 shift and 3,4 shift. I just thought this was normal. I usually just lean forward and turn off TCS 'till I am in 4th. With TCS off my tires chirp during those two shifts but I don't loose power. If this isn't normal maybe I should have it looked at.
-matt
This is normal behavior by the TCS but it means that you are doing a poor job of matching the revs when shifting. This is very hard on your clutch and will shorten its lifespan.
Well I did learn to drive manual in the NSX and only ~4 months ago so...
How do you match revs when shifting at 8000 RPM 1st gear into 2nd gear? I am talking about when I shift really fast and the revs fall form 8000 to ~5100 or so. (not sure exactly how far they fall) but they don't jump when I hit the gas again.
(sorry for more shifting habits posts) ;p
How do you match revs when shifting at 8000 RPM 1st gear into 2nd gear? I am talking about when I shift really fast and the revs fall form 8000 to ~5100 or so. (not sure exactly how far they fall) but they don't jump when I hit the gas again.
(sorry for more shifting habits posts) ;p
How do you match revs when shifting at 8000 RPM 1st gear into 2nd gear? I am talking about when I shift really fast and the revs fall form 8000 to ~5100 or so. (not sure exactly how far they fall)
In the Gear Ratios section of the FAQ, there's a chart that shows how far they fall. For example, with the stock 5-speed, they fall from 8000 to 4499 rpm on the 1-2 upshift. (They don't fall as much on the other upshifts.)
There are several tricks to smooth shifting:
1. Matching revs. If you're shifting quickly, this means timing the shift so that you let out the clutch exactly when the falling revs reach the point that they match the road speed the car is traveling.
2. Let off the clutch smoothly; don't just take your foot off suddenly (also known as "dumping the clutch").
In the Gear Ratios section of the FAQ, there's a chart that shows how far they fall. For example, with the stock 5-speed, they fall from 8000 to 4499 rpm on the 1-2 upshift. (They don't fall as much on the other upshifts.)
There are several tricks to smooth shifting:
1. Matching revs. If you're shifting quickly, this means timing the shift so that you let out the clutch exactly when the falling revs reach the point that they match the road speed the car is traveling.
2. Let off the clutch smoothly; don't just take your foot off suddenly (also known as "dumping the clutch").
ok so I was in the ball park the faq says my revs fall to 5106 which is about right.
As far as shifting.. I guess what I have been doing when shifting really fast is dumping the clutch.
As far as shifting.. I guess what I have been doing when shifting really fast is dumping the clutch.
I think you are greatly overstating the impact on the clutch from upshifts. Side-stepping the clutch off the line and other similarly abusive practices will waste a clutch pretty quick, but upshifts require no special talent in terms of clutch wear. Synchros on the other hand can take a beating because they are doing the speed matching work for you. Generally, the 1-2-1 synchro is the only one that tends to suffer in most cars, and that's as often due to forcing it into gear on downshifts rather than waiting for a lower speed or double clutching.
[This message has been edited by sjs (edited 13 August 2001).]
Why can't I laugh if I want?? I thought we went over this that it is a free country already?
Regardless if others and yourself have not had problems, this does not make everyone's car compatible with larger tires and wheels. unless ofcourse you can back up what you are saying because you are a former or current Honda engineer that specializes in TCS systems. Or how bout you come on by and hook up you laptop to my car's TCS system and upload the necessary changes so this little green light in the tach gauge does not come on. Or are my wheels broken....?????????
[This message has been edited by dochartung (edited 13 August 2001).]
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It is a fact that some of the early ('91 for sure, possibly some '92?) TCS units are overly sensitive to the point where they will activate TCS with a very small change in tire sizes such as going to OEM 16"/17". Some will also activate with the OEM 15"/16" tires over uneven road surfaces.
The only "fix" is to replace the unit.
Of course it is also possible there is another problem, such as a flaky sensor, etc.
The only "fix" is to replace the unit.
Of course it is also possible there is another problem, such as a flaky sensor, etc.
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