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#1
RPM to Speed Ratio
DattoFrog
Posted on: 2009/5/19 1:08
My speedo is not reeding right. I am running with a std 4spd box, std H150 diff ex 120y sedan and 185/70-13 bags.
Coulld some give me an idea at what rpm I would be doing 60, 80 and 100 Kph please.  
#2
Re: RPM to Speed Ratio
Sumith
Posted on: 2009/5/19 11:10
Hi DattoFrog
It depends on your driving habits and the area you are driving thanks regards sumith
#3
Re: RPM to Speed Ratio
dattodude
Posted on: 2009/5/19 11:53
So: Doing some google magic..
http://hondaswap.com/reference-materi ... ranny-speed-vs-mph-28672/ We find 185/70-13 tyres are 23.1 inches. I'll assume the 120Y diff is the standard Datsun 3.9:1 Now lets convert KMs to miles for the calculator: http://www.teaching-english-in-japan.net/conversion/kilometers Speed to RPM in 4th gear ----------------------- 60 kmh = 37.28 mph = 2114.79 RPM 80 kmh = 49.71 mph = 2819.91 RPM 100 kmh = 62.14 mph = 3525.03 RPM Hope this helps.
#4
Re: RPM to Speed Ratio
Mawler1
Posted on: 2009/5/19 12:10
depends if you have a F4W56A or a F4W60L gearbox as the 60L was designed to be put behind A14's and A15's and the ratios are different...
#5
Re: RPM to Speed Ratio
revhead001
Posted on: 2009/5/19 12:21
4th gear is still 1:1.
Use a mates sat nav. It's the safest way.
#6
Re: RPM to Speed Ratio
racetech
Posted on: 2009/5/19 14:18
The best Gear Calculation tool I have found to date.
http://race-tech.co.za/wp-content/uploads/2009/04/gearcalc.zip goto Tools/Ratios/Nissan
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