redline / MPH
May-21st-2005, 12:43 PM
#1
Rotor Head
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Join Date: Sep 2004
Location: Charlotte NC
Posts: 1,309
redline / MPH
ok...i have an 02DX 2.0l protege. problem is...theres no tach. so i was wondering what the redline is in each gear as in MPH.
1st--------**mph
2nd-------**mph
3rd--------85mph
4th--------***mph
5th--------***mph
peak torque is at 4000rpm, so i am wondering what would be a good shift point? winding it all the way to redline would put me right at the peak, if not then a little after (estimating), so should i shift at peak HP or peak TQ?
1st--------**mph
2nd-------**mph
3rd--------85mph
4th--------***mph
5th--------***mph
peak torque is at 4000rpm, so i am wondering what would be a good shift point? winding it all the way to redline would put me right at the peak, if not then a little after (estimating), so should i shift at peak HP or peak TQ?
May-21st-2005, 06:45 PM
#2
Registered User
Join Date: Aug 2002
Location: New Jersey
Posts: 349
Torque = 135 lbs/ft @ 4000 RPM
HP = 130 @ 6000 RPM
Redline = 6500 RPM
If you shift at redline, you'll be beyond your power peak.
To calculate MPH from a given RPM:
MPH = RPM/overall gear ratio(wheel diameter, in inches)
then, divide that figure by 336.31
To find the overall gear ratio in each gear (1st through 5th) see TheMAN's FAQ.
Reference:
The Design and Tuning of Competition Engines, Fifth Edition, by Philip H Smith, page 459
HP = 130 @ 6000 RPM
Redline = 6500 RPM
If you shift at redline, you'll be beyond your power peak.
To calculate MPH from a given RPM:
MPH = RPM/overall gear ratio(wheel diameter, in inches)
then, divide that figure by 336.31
To find the overall gear ratio in each gear (1st through 5th) see TheMAN's FAQ.
Reference:
The Design and Tuning of Competition Engines, Fifth Edition, by Philip H Smith, page 459
Last edited by goldstar; May-21st-2005 at 06:51 PM.
May-21st-2005, 08:58 PM
#3
Registered User
Join Date: Oct 2004
Posts: 1,277
ive never read on a forums yet until now... that someone had a reference for the information givin
that is one smart ma-fa right there
does that also work motorcycles?
or other toy mobiles?
(excluding marine (water) mobiles)
that is one smart ma-fa right there
does that also work motorcycles?
or other toy mobiles?
(excluding marine (water) mobiles)
May-21st-2005, 10:32 PM
#5
Registered User
Join Date: Nov 2004
Location: Lincroft, NJ
Posts: 1,105
Originally Posted by kmaalfiisa
ive never read on a forums yet until now... that someone had a reference for the information givin
that is one smart ma-fa right there
does that also work motorcycles?
or other toy mobiles?
(excluding marine (water) mobiles)
that is one smart ma-fa right there
does that also work motorcycles?
or other toy mobiles?
(excluding marine (water) mobiles)
P.S. Goldstar, where in Jersey are you....?
May-26th-2005, 11:54 AM
#10
Registered User
Join Date: Apr 2004
Location: Michigan
Posts: 1,164
Originally Posted by goldstar
To find the overall gear ratio in each gear (1st through 5th) see TheMAN's FAQ.
The above link will take you there.
May-26th-2005, 12:07 PM
#11
Registered User
Join Date: Apr 2004
Location: Michigan
Posts: 1,164
Originally Posted by goldstar
Torque = 135 lbs/ft @ 4000 RPM
HP = 130 @ 6000 RPM
Redline = 6500 RPM
If you shift at redline, you'll be beyond your power peak.
To calculate MPH from a given RPM:
MPH = RPM/overall gear ratio(wheel diameter, in inches)
then, divide that figure by 336.31
To find the overall gear ratio in each gear (1st through 5th) see TheMAN's FAQ.
Reference:
The Design and Tuning of Competition Engines, Fifth Edition, by Philip H Smith, page 459
HP = 130 @ 6000 RPM
Redline = 6500 RPM
If you shift at redline, you'll be beyond your power peak.
To calculate MPH from a given RPM:
MPH = RPM/overall gear ratio(wheel diameter, in inches)
then, divide that figure by 336.31
To find the overall gear ratio in each gear (1st through 5th) see TheMAN's FAQ.
Reference:
The Design and Tuning of Competition Engines, Fifth Edition, by Philip H Smith, page 459
May-26th-2005, 03:45 PM
#13
Registered User
Join Date: Apr 2004
Location: Michigan
Posts: 1,164
Okay, I think I've got it. There was a problem with the original formula, as you are supposed to use overall tire height (as opposed to wheel diameter alone). I thought something about it didn't make sense.
Please see the attached and let me know if anything about it seems funny. Of course, our cars will never pull redline in top gear. Even with the mods I've got, the absolute most I figure I could pull in top gear would be 5500rpm or so, give or take. That's good for just about 125.
The gear tables at TheMAN's FAQ are great if you want to build your own table in Excel and plug in some values.
In my attachment, the formulas are even called out for you in dialogue boxes.
Please see the attached and let me know if anything about it seems funny. Of course, our cars will never pull redline in top gear. Even with the mods I've got, the absolute most I figure I could pull in top gear would be 5500rpm or so, give or take. That's good for just about 125.
The gear tables at TheMAN's FAQ are great if you want to build your own table in Excel and plug in some values.
In my attachment, the formulas are even called out for you in dialogue boxes.
Last edited by juddz; May-26th-2005 at 03:51 PM. Reason: I am an idiot.
May-26th-2005, 03:59 PM
#14
Rotor Head
Thread Starter
Join Date: Sep 2004
Location: Charlotte NC
Posts: 1,309
Originally Posted by juddz
Okay, I think I've got it. There was a problem with the original formula, as you are supposed to use overall tire height (as opposed to wheel diameter alone). I thought something about it didn't make sense.
Please see the attached and let me know if anything about it seems funny. Of course, our cars will never pull redline in top gear. Even with the mods I've got, the absolute most I figure I could pull in top gear would be 5500rpm or so, give or take. That's good for just about 125.
The gear tables at TheMAN's FAQ are great if you want to build your own table in Excel and plug in some values.
In my attachment, the formulas are even called out for you in dialogue boxes.
Please see the attached and let me know if anything about it seems funny. Of course, our cars will never pull redline in top gear. Even with the mods I've got, the absolute most I figure I could pull in top gear would be 5500rpm or so, give or take. That's good for just about 125.
The gear tables at TheMAN's FAQ are great if you want to build your own table in Excel and plug in some values.
In my attachment, the formulas are even called out for you in dialogue boxes.
to the tach guy - buying a tach? well, its like 100$ that i dont have and 5" of rice i dont need
besides, i cant find a dash/gauge replacement for it.
May-26th-2005, 04:08 PM
#15
Registered User
Join Date: Apr 2004
Location: Michigan
Posts: 1,164
Originally Posted by Stueck
you = hero
to the tach guy - buying a tach? well, its like 100$ that i dont have and 5" of rice i dont need besides, i cant find a dash/gauge replacement for it.
to the tach guy - buying a tach? well, its like 100$ that i dont have and 5" of rice i dont need
besides, i cant find a dash/gauge replacement for it.