CR box what speed am I doing

[Scotty C]

as my speedo isnt working.

does anyone know what spped my car is doing?

S1 fitted with a CR box. i need to add stickers to the rev counter so i know what speed im going.

No Funny answera so i end up with loats of speeding tickets

[graeme]

Let's see, Scotty driving an S1, so...

9,500 RPM in 2nd gear is...

[Sanjøy]

GPS app for phone?

[robin]

20mph/1000RPM in 5th is pretty accurate.

More accurate calculation:

1000RPM / (0.848 * 4.20) = 280.8RPM at the wheel.

Wheel is 225/45 R 16 = 1857mm rolling circumferance.

Thus at 1000 RPM in 5th you'll be doing 280.8 * 1857 mm/min = 521,395mm/min = 19.44mph.

So the 20/1000 is a small overestimate which is what you want when considering staying within the speed limits.

Cheers,
Robin

[neil]

Do you want a shot of a sat nav? I've got a spare one that'll give you a speed readout

[tut]

Do you know what is causing the problem Scotty? Is it the sensor reading the toothed ring?

tut

[IanD]

As per Robins calculation and Steve's link to the seloc wiki guide in this post, can be calculated for all combinations but more fun going for drive with a GPS phone.

http://www.scottishelises.com/phpbb/vie ... 6&start=15

[Dominic]

Next time I'm in mine (hopefully next day or so) I will check revs at certain speeds.

[Mike Scib]

Next time I'm in mine (hopefully next day or so) I will check revs at certain speeds.

No need, I have already done it on route to the Ring

[Dominic]

Cool ............



....erm, wait a minute!!!

[mwmackenzie]

Next time I'm in mine (hopefully next day or so) I will check revs at certain speeds.

No need, I have already done it on route to the Ring

box?

I didn't think an elise with a CR could go that fast? I think that's a std box?

Would be handy to know 3rd and 4th calc/ratio for built up or speed restricted areas?

James (Jimbo) with my old 111s should be able to tell you?

[alicrozier]

Thats CR at those MPH/rpm

S1 CR box by gear...

MPH/1000rpm
1st 5.73
2nd 9.56
3rd 12.81
4th 16.20
5th 19.74

Standard S1 is:
MPH / 1000rpm
5.64
9.69
13.66
17.28
23.33

[Dominic]

I didn't think an elise with a CR could go that fast? I think that's a std box?

That is a Sport 135 (now mine! ), so it is a CR box.

I once saw (I think I was on the autobahn at the time ) 143tuts indicated on my 111s (also CR box). As I say, indicated - not sure how accurate the stack is though.

[alicrozier]

That is a Sport 135 (now mine! ), so it is a CR box.

I once saw (I think I was on the autobahn at the time ) 143tuts indicated on my 111s (also CR box). As I say, indicated - not sure how accurate the stack is though.

The 2-11 saw all the shift lights in 6th on the Autobahn (following AndyG in the GT3). It was difficult to tell as I was having to hold on to my Oakleys (they seem only stable up to 150) but I suspect a genuine 160. It probably would have been reckless to take the other hand off the wheel for a photo.

I also bumped the limiter in top along Dottinger Hohe after drafting an M3. If 8,200rpm that would have been 165mph...

[Scotty C]

That is a Sport 135 (now mine! ), so it is a CR box.

I once saw (I think I was on the autobahn at the time ) 143tuts indicated on my 111s (also CR box). As I say, indicated - not sure how accurate the stack is though.

The 2-11 saw all the shift lights in 6th on the Autobahn (following AndyG in the GT3). It was difficult to tell as I was having to hold on to my Oakleys (they seem only stable up to 150) but I suspect a genuine 160. It probably would have been reckless to take the other hand off the wheel for a photo.

I also bumped the limiter in top along Dottinger Hohe after drafting an M3. If 8,200rpm that would have been 165mph...

yip i did the same had to hold onto my oakleys, 157 2 up with ozzy dave chasing a bike on route to the ring. i hope i was in Germany at the time