NSX vs NSX ( me and my GF's NSX ) why?

VampNSXX

VampNSXX

Experienced Member
Joined
3 January 2003
Messages
1,252
Location
California
need to see if any one could tell me why this is.


me and my GF were trying to see how much faster my NSX is from her NSX both are 91 and have a 3000 difference in the motor.


my car
short gears
headers
tubi
no cats
rps clutch
17 and 18 wheels

her car
stock with a rps clutch


from a dead stop the 2 cars are head to head up to 3rd gear is when my car is faster and you could see it then.
from a rolling start in 1 gear my car is just a little faster when we go to 2nd gear but not much faster just like 1 feet ahead.
from a rolling start in 2nd gear my car does go much faster and you could see it. I pull from her fast.


my question is why does it vary in different situations? I would think that my NSX should be faster every time because I have more HP than she does but its not so, it faster yes but taking of from 0 to 3/4 of 2nd grear we are head to head.

why is that?

both cars were just at autowave and there is nothing wrong with them at all. bill of health 100% good.
 
with headers, exhaust, and no cats, you might have lost some backpressure which slightly reduces your torque at the low-end, which may explain why from stand-still and lower RPM's your car is closer to the gf's car. This difference goes away in higher gears and RPM's.
 
If the 17" & 18" wheels/tires are larger in diameter than the stock ones, then this would have the same effect as reducing (?) the rear end gearing, ie, from 4.023 to maybe a 3.80, I think.
 
This is a test, isn't it?

my car
short gears
headers
tubi
no cats
rps clutch
17 and 18 wheels

her car
stock with a rps clutch
Click to expand...

Here's your answer... Also like other said, Modification sometimes will hurt the torque/hp curve, and at that point, other factors came in play.

or, you just want to stir our mind that not only you have a good looking girl, she also drives a NSX? (Girl who owns a nsx, hot... with RPS clutch and no compliant...... hotter!)

Well, either way, 2 nsx on the driveway is cool.....
 
whatisreal7 said:
with headers, exhaust, and no cats, you might have lost some backpressure which slightly reduces your torque at the low-end, which may explain why from stand-still and lower RPM's your car is closer to the gf's car. This difference goes away in higher gears and RPM's.
Click to expand...

this sound like what is happening. unless there is another reson.
 
NSXDreamer2 said:
This is a test, isn't it?



Here's your answer... Also like other said, Modification sometimes will hurt the torque/hp curve, and at that point, other factors came in play.

or, you just want to stir our mind that not only you have a good looking girl, she also drives a NSX? (Girl who owns a nsx, hot... with RPS clutch and no compliant...... hotter!)

Well, either way, 2 nsx on the driveway is cool.....
Click to expand...


so the shot gears on my car are actually making my car slower at start?

I would have thought it would make it faster.
 
whatisreal7 said:
with headers, exhaust, and no cats, you might have lost some backpressure which slightly reduces your torque at the low-end, which may explain why from stand-still and lower RPM's your car is closer to the gf's car. This difference goes away in higher gears and RPM's.
Click to expand...

Explain to me why back pressure increases torque on the low end. I could see why if you had smaller pipe diameters it would as you would have increased exhaust velocity on the low end but would be sacrificing top end power as you start to choke the flow. The same converse relationship would make sense too, if you have larger exhaust pipes than another car the low end could suffer because of slower velocity initially through the pipes. What I don't get is why people say back pressure is needed on an engine for increased power etc.
 
Deltron Zero said:
Why don't you ask Brian Spilner? That's where I go for all by automotive advice. That guy's a genious!
Click to expand...

A genius he is. He is the only person I've ever seen being able to shift 7 times in a 5 speed tranny eclipse. I tried asking him how he did it and he just told me "i take my life a quarter mile at a time. For those 10 seconds, I'm free". I was like oookayy... no really, how'd you do it? And he just repeated himself. I don't get him.
 
Dude,

Who cares which car is faster and why...SHIT, NOT ONLY DO YOU HAVE A GIRLFRIEND WHO IS INTO CARS, SHE ALSO DRIVES AN NSX!!!!!!!!!!! We're not worthy, we're not worthy..

All Hail The Fire Chief,

Regards,

Danny
 
lowellhigh79 said:
Dude,

Who cares which car is faster and why...SHIT, NOT ONLY DO YOU HAVE A GIRLFRIEND WHO IS INTO CARS, SHE ALSO DRIVES AN NSX!!!!!!!!!!! We're not worthy, we're not worthy..

All Hail The Fire Chief,

Regards,

Danny
Click to expand...

I care because if spending money on my car to inprove the performance and it ends up in the same place it was when stock then I just blew thousnds of dollars on basically nothing.


dont want to trow away money. I am not a millon dollar man yet.
 
I agree with the others who posted that you might have lost some low end torque with your headers, test pipes, and exhaust. The modifications weren't for nothing. Your car is faster, and it must sound much better than stock.
 
getting an AIS and uni-filter (or that big-ass intake that gruppeM makes in carbon fiber) might help you get some of that low-end back. Cost you <$200. If you really want that lower-end torque i'm afraid you'll have to go forced induction, and that's some serious money. btw i think someone is selling a GruppeM supercharger in the for sale section if you really wannt kick your gf's ass.
 
I had some head work done on my old yamaha 440 snowmobile, my wife at that time ran the same sled that had run into a tree and had a dented in exhaust system. Her sled waxed mine. Sounds like the same thing here.
This is one of the reasons i left my cats on when I got headers.
Also I only gutted part of my stock muffler and left some backpressure.
No science here, just trying some different stuff.
It will be interesting to see how she dynos after I break in that Refreshed Motor from SOS. I just know it sounds great.
Enjoy the cars and the lady friend.
Trev
 
VampNSX said:
I care because if spending money on my car to inprove the performance and it ends up in the same place it was when stock then I just blew thousnds of dollars on basically nothing.


dont want to trow away money. I am not a millon dollar man yet.
Click to expand...

Vamp,

I know what you mean about getting your performance "bang for the buck." Now for the serious response. I think if you overlap the two cars' dyno graph (hypothetical as you probably have not dynoed both cars on the same dyno, back to back), most of your gains will be in the top end, say after Vtec comes on.
As you stated in the three scenarios, 1st is basically a wash, especially from a standstill start because most of the time in 1st will be below 6000 rpm, where both cars exhibit similar hp numbers. When you get into the higher rpms in 2nd, then 3rd and so on, you are spending more time in the higher rev band where your additional mods are working. Your bigger wheels (front and rears) are a disadvantage however. The gains by your short gears are offset by your bigger wheels and the added torque you may have gained is at least partially offset by the heavier wheels (likely heavier).


Regards,

Danny
 
Last edited:
lowellhigh79 said:
Dude,

Who cares which car is faster and why...SHIT, NOT ONLY DO YOU HAVE A GIRLFRIEND WHO IS INTO CARS, SHE ALSO DRIVES AN NSX!!!!!!!!!!! We're not worthy, we're not worthy..

All Hail The Fire Chief,

Regards,

Danny
Click to expand...

I agree. Post pics of the GF with her NSX, ya its ok if you are in the photos with your NSX :P
 
Hmm, I understand your question completely.
There is a lot of assumption in the replies so far, but I think there is only one think you should do.
First, of all, put yourself and your girlfriend on a scale (separately of course :smile: ) so you will no your weight.
Then, fill up both cars and have them weighed as they are being driven. (Maybe she's driving around with an empty boot while you are driving with lots of stuff in it.). Then, you will know the weight of both cars.
Then, go to the same shop and have both cars dynoed. Don't just ask for the graph, ask them for the full listing of the results.

Then, with all these results, you can play around in Excel (or whatever spreadsheet you use) and then start calculating.

Something else you can do to measure....
Swap you wheels with those of your girlfriend's car and test again.
I'm sure you see a bigger difference then.
 
MvM said:
Hmm, I understand your question completely.
There is a lot of assumption in the replies so far, but I think there is only one think you should do.
First, of all, put yourself and your girlfriend on a scale (separately of course :smile: ) so you will no your weight.
Then, fill up both cars and have them weighed as they are being driven. (Maybe she's driving around with an empty boot while you are driving with lots of stuff in it.). Then, you will know the weight of both cars.
Then, go to the same shop and have both cars dynoed. Don't just ask for the graph, ask them for the full listing of the results.

Then, with all these results, you can play around in Excel (or whatever spreadsheet you use) and then start calculating.

Something else you can do to measure....
Swap you wheels with those of your girlfriend's car and test again.
I'm sure you see a bigger difference then.
Click to expand...

Hi Marteen,

Weight was already addressed when they swapped cars.

Regards,

Danny
 
unit-x said:
A genius he is. He is the only person I've ever seen being able to shift 7 times in a 5 speed tranny eclipse. I tried asking him how he did it and he just told me "i take my life a quarter mile at a time. For those 10 seconds, I'm free". I was like oookayy... no really, how'd you do it? And he just repeated himself. I don't get him.
Click to expand...


I asked him how double clutching during a drag race helps and all he would say is "I like the tuna here."
 

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