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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? |
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 |
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) |
Yes, that formula will work for motorcycles also.
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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) P.S. Goldstar, where in Jersey are you....? |
I live in northern NJ near Parsippany.
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no one will just say :he, first is 35 and second is 50"?
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Goldstar just curious where you get the 336.31 number?
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Why dont you just get a tach ???
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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. |
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 |
Sounds like a plan, huh mac?
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1 Attachment(s)
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. |
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. to the tach guy - buying a tach? well, its like 100$ that i dont have and 5" of rice i dont need :p besides, i cant find a dash/gauge replacement for it. |
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 :p besides, i cant find a dash/gauge replacement for it. |
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