I think I've seen one of these before - if you know your tire diameter, final drive and gear ratio, you can input a certain RPM and get the car's theoretical speed as a result.

Reason - I followed Bef back to RDU from GSO tonight, and when we got back, I made a comment about her sudden onset of "lead foot." I was running an indicated 80-82 the whole way, while she swears the cruise on her Tore-*** was set at 73. I was showing a solid 4200 rpm indicated, which means about 4400 actual. Is that right, or are our speedos as wompted as the tachs? Just want to figure out what MPH 4400 rpm *should* be in an R.


Pat, who is posting his second "bored" thread of the day

 

I'll check on my way to work

 

on mine 4400 is around 80 mph.

 

Yeah, I know this. But my question is, what is the calculated speed for 4400 rpm? I know indicated - I have a speedo in my car. I'm trying to figure out which of our (mine or Bef's) speedos is off, and by how much.

 

oops sorry, misunderstood ya

 

http://www.4lo.com/

R speedo is off by ~7mph above 70mph.

 

http://www.smokemup.com/utilities/calc/mph_range.cfm

 

You guys didn't figure this out yet?

ITRs can't rev any higher or reach any speeds quicker than a GSR.

Acura just made the gauge clusters less accurate which fools us into believing our cars are faster.

 

While we are speaking of calculators, does anyone know what happened to the Honda CR calculator? That was totally useful for seeing what would happen with different pistons in different motors. Does anyone know another good calculator to use or could point me in the direction of the specs I would need in order to calculate compression for different Honda motors? My Helms manual does not have the specs I need.

 

Conspiracy?

 

All in the name of saving weight

 

The conversion is as follows:

1km/hr = 0.62 mi/hr

Here's the long division:

(1000m/hr)X(100cm/1m)X(1inch/2.43cm)X(1ft/12inch)X(1mi/5280 ft.)