JDM Tuning Expert advice and discussion on JDM tuning for your S2000.

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Old Jan 7, 2007 | 08:59 AM
  #3391  
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Originally Posted by tcjensen,Jan 6 2007, 05:24 PM
versionjdm,

Do you reach higher speeds in given gears at redline while going through the gears with the 70mm as opposed to the hks/stock setup?
For example, I want to hit 60mph in second. My AP2 only gets to 55 or a lil higher if you bounce it. I've always been curious how much power I would have to add to do that.

blownap,

I'm confused---comparing your dyno charts with your sig numbers. Did the sig come from a previous setup or did you switch dynos? Just trying to follow everyone's experiences.

wildcardtrd,

Be sure to post pics. Good luck!

thx,
Tom
Ok...because some of you guys still seem a little confused:

Horsepower does not control how fast you can go in any certain gear. The gear is a solid piece of metal with a finite number of teeth and regardless of you having 20hp or 2000hp it is going to spin at the same speed everytime. So at the rev limiter you are limited to having the engine spin the gear box at ~ 9000rpm that will translate into the gears spinning a certain rpm, the final drive (in the diff) spinning at a certain rpm...and the wheels spinning at a certain rpm or mph, and it will all be constant.

What more horsepower will do is it will get you through the gears faster.

Now as far as the top speed thing, you guys have that down. If your car is gear limited then you will hit your rev limiter at your top speed. However if the car is drag limited then you will get to a certain speed and not be able to go any faster because your car is not producing enough power to overcome aero and friction drag. If the later is your case, then yes, adding power to the car will increase your top speed. If you car is gear limited however, power will only get you to your top speed faster but it can not increase the top speed. It could theoretically change the top speed if you changed the car's gearing with say 3.9 rear gears
Old Jan 7, 2007 | 11:54 AM
  #3392  
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Originally Posted by Silver9k,Jan 7 2007, 09:59 AM
Ok...because some of you guys still seem a little confused:

Horsepower does not control how fast you can go in any certain gear. The gear is a solid piece of metal with a finite number of teeth and regardless of you having 20hp or 2000hp it is going to spin at the same speed everytime. So at the rev limiter you are limited to having the engine spin the gear box at ~ 9000rpm that will translate into the gears spinning a certain rpm, the final drive (in the diff) spinning at a certain rpm...and the wheels spinning at a certain rpm or mph, and it will all be constant.

What more horsepower will do is it will get you through the gears faster.

Now as far as the top speed thing, you guys have that down. If your car is gear limited then you will hit your rev limiter at your top speed. However if the car is drag limited then you will get to a certain speed and not be able to go any faster because your car is not producing enough power to overcome aero and friction drag. If the later is your case, then yes, adding power to the car will increase your top speed. If you car is gear limited however, power will only get you to your top speed faster but it can not increase the top speed. It could theoretically change the top speed if you changed the car's gearing with say 3.9 rear gears
pretty much what i said in my first post,
Old Jan 7, 2007 | 12:28 PM
  #3393  
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^ yep and ^^yep

just seems like some people aren't fully understanding that a gear is a solid piece of metal that doesn't change with hp
Old Jan 7, 2007 | 12:37 PM
  #3394  
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2QY, BlownAP, Silver9k, thanks for the clarification

So just for kicks, in order to increase the 150-155 mph top speed of the s2k, one would have to:

a) swap out for a lower final drive

and

b) reduce the aero-drag coefficient (would this be possible i.e. hardtop ?)

and

c) increase the horsepower by a significant margin (turbo, blower, stroker, etc)

anything else I missed?
Old Jan 7, 2007 | 12:40 PM
  #3395  
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your right for top speed.


if you want to raise the speed you will hit in lower gears, 1-4. you could ether lower your final drive, Raise your Revs, or Change your Tire size
Old Jan 7, 2007 | 02:38 PM
  #3396  
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This is how we suppose to drive our car!!

Watch his feet if you wanna learn heel/toe braking.

Check it out
http://vids.myspace.com/index.cfm?fuseacti...eoid=1655095907
Old Jan 7, 2007 | 03:07 PM
  #3397  
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kenstyle is a genius, thats all I have to say, lol. To think that an increase of HP would increase your speed in a gear at a certain RPM shows a serious lack of understanding basic automotive concepts......

I suggest looking at http://auto.howstuffworks.com/ before tackling the 230rwhp thread....
Old Jan 7, 2007 | 03:41 PM
  #3398  
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Originally Posted by kenstyle,Jan 7 2007, 11:00 AM
I'd be pretty disappointed if I threw on a huge turbo and dyno'd 450+ rwhp and still theoretically be limited to the stock top speed.
Well, you'd be disappointed in the wrong forum.

You know those black plastic little pieces in front of your tires that get redesigned everytime you scrape the ground? Those are functional in reducing lift at the tires(so I've read). Soooo, if you plan on running higher speeds, be sure to check those from time to time. Couldn't figure out why, at speed, I was feeling some instability. Come to find out, I was missing one of those deflectors.
Old Jan 7, 2007 | 04:00 PM
  #3399  
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Originally Posted by deathsled,Jan 7 2007, 04:07 PM
kenstyle is a genius, thats all I have to say, lol. To think that an increase of HP would increase your speed in a gear at a certain RPM shows a serious lack of understanding basic automotive concepts......

I suggest looking at http://auto.howstuffworks.com/ before tackling the 230rwhp thread....
Ouch! that is harsh.....

Anyone have any Criticism? on My VAFC tune? I know the Fuel Curve is not as smooth as stock but i will work on that,

pretty good power for a noob trying to tune??
Old Jan 7, 2007 | 04:01 PM
  #3400  
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[QUOTE=deathsled,Jan 7 2007, 04:07 PM] kenstyle is a genius, thats all I have to say, lol.



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