3rd Gen Protege/MazdaSpeed/P5/MP3 General/Maintenance Discussion for 1999-2003.5 Models Only (BJ Chassis)

60 mph in 2nd gear!

Thread Tools
 
Search this Thread
 
Old Jul 1, 2002 | 03:15 PM
  #1  
njaremka's Avatar
Thread Starter
Banned
 
Joined: Oct 2001
Posts: 1,241
From: Central New York
njaremka is on a distinguished road
60 mph in 2nd gear!

well, work is a little slow, so i did some calculations on the gear ratios and tire sizes and max power and max torque figures all found off mazdas web site. well, the short of it is i noticed in second gear, we can hit 60.5 mph at 6500 rpm. of course, this is based on the gear ratios listed on mazdas web site, and a crude calculation of the rolling distance of the stock tires. another point, if this is true, my spedo / tach is waayy off. i think the lasat time i ran the car, at an indicated 6500 rpm, my speedo read something like 56 mph.

just thought i would share. based on 2001 es.
Old Jul 1, 2002 | 03:20 PM
  #2  
5SpeedP5's Avatar
SHIFT_mystick
 
Joined: Dec 2001
Posts: 1,228
From: Lincoln, Ne
5SpeedP5 is on a distinguished road
so basically thatd mean our real 0-60 time is much lower than what has been posted by magazines, as everyone ive heard of goes to 3rd gear
Old Jul 1, 2002 | 03:46 PM
  #3  
njaremka's Avatar
Thread Starter
Banned
 
Joined: Oct 2001
Posts: 1,241
From: Central New York
njaremka is on a distinguished road
could be. i would suspect that there could be some error in my claculations, too. i would have to know the actual rolling circumference of the tires to know more precisely. i guessed at it by taking the profile (195) times the aspect ratio (50%) times two, converted to inches, added to the wheel diamter (16), and used circumference = pi * diameter. it comes out pretty close, but it won't be exact.
Old Jul 1, 2002 | 03:47 PM
  #4  
nightowl's Avatar
Registered User
 
Joined: Oct 2001
Posts: 1,030
From: ottawa, ontario canada
nightowl is on a distinguished road
i redline in second doing 80km/h in my P5
Old Jul 1, 2002 | 03:55 PM
  #5  
njaremka's Avatar
Thread Starter
Banned
 
Joined: Oct 2001
Posts: 1,241
From: Central New York
njaremka is on a distinguished road
well, i checked up on dunlops web site, and they list the rolling circumference as smaller than i had calculated it. while it may not look like much, it made a little difference in my calcs. it now seems that to hit 60 mph in second gear, you need to rev up to 6701 rpm. while i have done this in my car, the power isn't really there. and this might be the reason that the magazines / testers had to shift to third gear.
Old Jul 1, 2002 | 08:52 PM
  #6  
mp5's Avatar
mp5
Fire Trucks Rock
 
Joined: Nov 2001
Posts: 302
From: Philly (Yo)
mp5 is on a distinguished road
if you dont mind the rev limiter you can push it a bit more than 60!
Old Jul 1, 2002 | 09:00 PM
  #7  
mp5's Avatar
mp5
Fire Trucks Rock
 
Joined: Nov 2001
Posts: 302
From: Philly (Yo)
mp5 is on a distinguished road
Too deep... you are reading too deep into the statement...
Old Jul 2, 2002 | 01:04 AM
  #8  
Davard
Guest
 
Posts: n/a
Originally posted by PseudoRealityX
stock tachs and speedos are usually off, or at least slow to respond to real changes in engine rpm or car speed.

Both of those combined with that the fact that circumfrence changes with tire wear, and even slightly with pressure would make up for any REAL accuracy.

The first gens goto 64 at fuel cut, IIRC...and its fastest to shift them there.

the 3rd gen guys should be short shifting because of the lack of power up top. This is probably how they got to 3rd gear trying to get the best 0-60s.
Actually, for fastest acceleration (and not 0-60 times), the shift from 2nd to 3rd should be at around 6500 rpm. This brings you into the meat of the torque curve.

For autocross, leaving it in 2nd to the rev-limiter is faster because you don't have to shift up and down, as long as you are on the rev-limiter for more than a sec or two.

And most magazines use the redline on the tach as a shift point. There are quite a few cars that would be faster if you shifted at the fuel cut rather than at the redline (Like the Celica GTS in 1st-2nd), and some are slower if taken to the redline (cars that make no power in the last 1500 rpm, only noise).

The BP Protege is faster if you shift from 1st-2nd at cut-off, because it keeps you higher up in 2nd at the shift.
Old Jul 2, 2002 | 08:16 AM
  #9  
David's Avatar
Registered User
 
Joined: Oct 2001
Posts: 545
From: W.Htfd. CT
David is on a distinguished road
I can't speak for the 2.0L but on my 1.8 I can not get to 60MPH in 2nd. 52-54 MPH and I'm the limiter. the speedo on almost every car are off alittle but they will be off on the plus side. By law they can't tell you your going 25MPH when your driving 40MPH (this is in stock form).
Old Jul 2, 2002 | 08:23 AM
  #10  
njaremka's Avatar
Thread Starter
Banned
 
Joined: Oct 2001
Posts: 1,241
From: Central New York
njaremka is on a distinguished road
Originally posted by 90&00 Protege
The stock tach is basically to be disregarded at high rpms. In doing the last round of tuning on my Miata (which has an aftermarket ECU), I had set the hard rev limit at 7,400rpm. I found that I was shifting at beyond 8,000rpm on the tach (there's no numbers past 8,000) and I still hadn't hit the rev limiter.
you know, after doing my calculation, i am tending to think that the stock tach in my protege is pretty good. according to my revised calcs, i should be hitting 60mph just after redline. when pushing the car, i can hit 60 in 2nd if i rev up into the red zone on the tach, just past redline.
Old Jul 2, 2002 | 05:03 PM
  #11  
Davard
Guest
 
Posts: n/a
Originally posted by 90&00 Protege
The stock tach is basically to be disregarded at high rpms. In doing the last round of tuning on my Miata (which has an aftermarket ECU), I had set the hard rev limit at 7,400rpm. I found that I was shifting at beyond 8,000rpm on the tach (there's no numbers past 8,000) and I still hadn't hit the rev limiter.
My stock tach is a pretty consistent 4% high. At the 7200rpm fuel cut, it registers 7500. At 70 mph, where it should read 3500rpm, it's a little below 3700. At least it's consistent. My friend's '92 LX appears to be dead on, however.
Old Jul 4, 2002 | 01:51 PM
  #12  
protetype's Avatar
Registered User
 
Joined: Sep 2001
Posts: 1,667
From: Centennial, Colorado
protetype is on a distinguished road
Originally posted by TheMAN

Last edited by protetype; Jul 4, 2002 at 02:02 PM.
Old Jul 4, 2002 | 03:10 PM
  #13  
protetype's Avatar
Registered User
 
Joined: Sep 2001
Posts: 1,667
From: Centennial, Colorado
protetype is on a distinguished road
Originally posted by TheMAN
you see that Jesse? he called you stupid! what a 'tard. i hope you're not gonna take that from the likes of him. you know his kind just likes to act tough. RTFM, i'm sure it says in there somewhere that everything in Texas is bigger and better, including the ego of a certain Man.
Old Jul 4, 2002 | 03:24 PM
  #14  
protetype's Avatar
Registered User
 
Joined: Sep 2001
Posts: 1,667
From: Centennial, Colorado
protetype is on a distinguished road
Originally posted by PseudoRealityX



so you agree that youre a retard?
Old Jul 4, 2002 | 08:03 PM
  #15  
protetype's Avatar
Registered User
 
Joined: Sep 2001
Posts: 1,667
From: Centennial, Colorado
protetype is on a distinguished road
Johnny... don't make me destroy you ::heavy breathing::

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
atila
1st gen/323/GLC Engine and Drivetrain
0
Aug 11, 2003 07:31 PM
DigitalAssassin
3rd gen Engine/Drivetrain
7
Mar 16, 2003 02:20 AM
JustinMP3
3rd gen Engine/Drivetrain
6
Aug 11, 2002 09:31 PM
Buck Rogers
3rd Gen Protege/MazdaSpeed/P5/MP3
10
Jul 21, 2002 09:36 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 



All times are GMT -5. The time now is 06:29 AM.