Does the headers increase the MPH at the top of 3rd?
Thread Starter
Happy CL-S Pilot
Joined: Jan 2001
Posts: 9,215
Likes: 1
From: Nashua, NH, USA
Does the headers increase the MPH at the top of 3rd?
I noted that now flooring it in 3rd... I approacd 95 MPH and still hvae like 1000 rpms to go... So I guess now I can redline 3rd at 105+ MPH...
Anyone noted that? Does headers improve speed at the same rpm at the top of the 3rd?
Anyone noted that? Does headers improve speed at the same rpm at the top of the 3rd?
SHIFT_over.so.I.can.see
Joined: Aug 2002
Posts: 3,760
Likes: 1
From: Lubbock, TX
mph in third? I'm thinking that headers like any other performance part would only change how fast your engine finished 3rd ... MPH has to do with the ratio between engine/tranny/wheels... nothing to do with the hp of the engine... I'm thinking that at X RPMs in X gear that the car will always run at the same speed in MPH...
Thread Starter
Happy CL-S Pilot
Joined: Jan 2001
Posts: 9,215
Likes: 1
From: Nashua, NH, USA
I thoight the same, but I think I see 3-digit speed very quick now... so now I am 
only at the track I can note the difference.. I mean at the drag is the only place that I top 3rd at 7100rpms and shift to 4th!
only at the track I can note the difference.. I mean at the drag is the only place that I top 3rd at 7100rpms and shift to 4th!
Oh yeah.. spd!
Sold 12/29/04 :-(
Joined: Feb 2001
Posts: 1,277
Likes: 0
From: Ft. Lauderdale, FL
More HP does add more MPH. The general rule is you gain about 1 MPH for every 10-12 HP gained across the entire RPM band. If you are just peaking 10 HP at the end of your RPM band you will most likely not gain 1 MPH, however if you gain 10 HP over a more consistant range like (4500 to 6900 RPM) you will gain about 1 MPH.
Trending Topics
Suzuka Master
Joined: Mar 2002
Posts: 5,579
Likes: 0
From: Chicago Suburbs
Re: Does the headers increase the MPH at the top of 3rd?
Originally posted by Nashua_Night_Hawk
I noted that now flooring it in 3rd... I approacd 95 MPH and still hvae like 1000 rpms to go... So I guess now I can redline 3rd at 105+ MPH...
Anyone noted that? Does headers improve speed at the same rpm at the top of the 3rd?
I noted that now flooring it in 3rd... I approacd 95 MPH and still hvae like 1000 rpms to go... So I guess now I can redline 3rd at 105+ MPH...
Anyone noted that? Does headers improve speed at the same rpm at the top of the 3rd?
Drifting
Joined: Nov 2000
Posts: 3,373
Likes: 0
From: Chicago, IL USA
Re: Re: Does the headers increase the MPH at the top of 3rd?
Max is on the money. With more HP you just get to the MPH faster. You still shift at the same MPH
Originally posted by Maximized
Nope....Your gearing hasnt changed so speed in gears is the same.
Nope....Your gearing hasnt changed so speed in gears is the same.
2ManyMiles
Joined: Sep 2002
Posts: 337
Likes: 0
From: Dallas
DeezNutz' 2 Cents for the Day...
/Start 2 Cents
I've definitely been over 110 in 3rd a few times (always under safe driving conditions of course), and agree with the fellows who say that HP does NOT increase the speed in a gear--it's all linked together the same, so you'll just get there faster.
/End 2 Cents
/Start 2 Cents
I've definitely been over 110 in 3rd a few times (always under safe driving conditions of course), and agree with the fellows who say that HP does NOT increase the speed in a gear--it's all linked together the same, so you'll just get there faster.
/End 2 Cents
Burning Brakes
Joined: Feb 2002
Posts: 763
Likes: 0
From: MD
Have you changed the tires / rims while you were doing headers? A different size tire or rim will change your effective gear ratio and could account for some difference indicated on the speedo and tach.
Horsepower will never change your mph or rpms at any given point - that's controlled by the combined ratios of the tranny, differential and tire / rim combo..
Horsepower will never change your mph or rpms at any given point - that's controlled by the combined ratios of the tranny, differential and tire / rim combo..
SHIFT_over.so.I.can.see
Joined: Aug 2002
Posts: 3,760
Likes: 1
From: Lubbock, TX
Originally posted by SFLA_Type-S
More HP does add more MPH. The general rule is you gain about 1 MPH for every 10-12 HP gained across the entire RPM band. If you are just peaking 10 HP at the end of your RPM band you will most likely not gain 1 MPH, however if you gain 10 HP over a more consistant range like (4500 to 6900 RPM) you will gain about 1 MPH.
More HP does add more MPH. The general rule is you gain about 1 MPH for every 10-12 HP gained across the entire RPM band. If you are just peaking 10 HP at the end of your RPM band you will most likely not gain 1 MPH, however if you gain 10 HP over a more consistant range like (4500 to 6900 RPM) you will gain about 1 MPH.
Grammar Police
Joined: Feb 2002
Posts: 196
Likes: 0
From: SF Bay Area
Originally posted by SFLA_Type-S
More HP does add more MPH. The general rule is you gain about 1 MPH for every 10-12 HP gained across the entire RPM band. If you are just peaking 10 HP at the end of your RPM band you will most likely not gain 1 MPH, however if you gain 10 HP over a more consistant range like (4500 to 6900 RPM) you will gain about 1 MPH.
More HP does add more MPH. The general rule is you gain about 1 MPH for every 10-12 HP gained across the entire RPM band. If you are just peaking 10 HP at the end of your RPM band you will most likely not gain 1 MPH, however if you gain 10 HP over a more consistant range like (4500 to 6900 RPM) you will gain about 1 MPH.
There is a direct connection between the engine crank, the transmission, and the wheels.... The only thing that affects car speed at the redline is: the engine RPM, the gear you're in, and the radius of your wheels/tires.
Moderator Alumnus
Joined: Dec 2001
Posts: 9,263
Likes: 2
From: Lenexa, KS
Seems some people think adding HP gives you better top speed in each gear.
If you have two similar cars with the same wheels, transmission, tires, differential gearing and redline limit. Even if one has 1000hp and the other 260. Both will have the same max. speeds in each gear...
period. Modifying the engine doesn't change the gearing...
Now it could be possible the 260hp doesnt have enough power to max out the last gear because of wind resistance.
If you have two similar cars with the same wheels, transmission, tires, differential gearing and redline limit. Even if one has 1000hp and the other 260. Both will have the same max. speeds in each gear...
period. Modifying the engine doesn't change the gearing...
Now it could be possible the 260hp doesnt have enough power to max out the last gear because of wind resistance.
Three Wheelin'
Joined: Jul 2000
Posts: 1,505
Likes: 0
From: South Florida
Originally posted by SiGGy
Seems some people think adding HP gives you better top speed in each gear.
If you have two similar cars with the same wheels, transmission, tires, differential gearing and redline limit. Even if one has 1000hp and the other 260. Both will have the same max. speeds in each gear...
period. Modifying the engine doesn't change the gearing...
Now it could be possible the 260hp doesnt have enough power to max out the last gear because of wind resistance.
Seems some people think adding HP gives you better top speed in each gear.
If you have two similar cars with the same wheels, transmission, tires, differential gearing and redline limit. Even if one has 1000hp and the other 260. Both will have the same max. speeds in each gear...
period. Modifying the engine doesn't change the gearing...
Now it could be possible the 260hp doesnt have enough power to max out the last gear because of wind resistance.
The things that affect top speed in a given gear are maximum RPM and effective gearing (gear ratio, final drive ratio and OD of the tire). Power has nothing to do with it.
Thread
Thread Starter
Forum
Replies
Last Post
IBankMouse
1G TSX (2004-2008)
8
Jun 13, 2020 12:53 PM
navtool.com
5G TLX Audio, Bluetooth, Electronics & Navigation
31
Nov 16, 2015 08:30 PM