what speed does this =

[dbn04]

if you were doing 5500rpm in 4th gear with a t5 box and 3.55 rear gears , 15 in rims and tyres 275/50/15 what speed would you be doing?

[Tommy]

If 4th gear is 1:1, the final drive ratio is 1 x 3.55 = 3.55 engine revs per wheel rotation. At 5500 RPM, the wheels are turning at 5500/3.55 = 1549.3 RPM. Tirerack.com says a BFGoodrich tire in 275/50/15 does 803 revolutions per mile. So, in one minute that wheel will travel 1549.3 / 803 = 1.93 miles. That is a speed of 1.93 miles/minute x 60 minutes/hour = 115.8 MPH, or 186 KPH.

[wtm442]

Just plug and play ...

http://www.secondstrike.com/Technical/GearCalc.asp

Speed (MPH) in Gears at RPM

Speed (MPH) in Gears at RPM

Gear 1st 2nd 3rd 4th 5th 6th
Trans Ratio 3.27 1.98 1.34 1.00 0.68
Overall Ratio 11.61 7.03 4.76 3.55 2.41
Split 1.65 1.48 1.34 1.47
Rev/Mile 9,380 5,679 3,844 2,868 1,950
1500 10 16 23 31 46
2000 13 21 31 42 62
2500 16 26 39 52 77
3000 19 32 47 63 92
3500 22 37 55 73 108
4000 26 42 62 84 123
4500 29 48 70 94 138
5000 32 53 78 105 154
5500 35 58 86 115 169
6000 38 63 94 126 185
6500 42 69 101 136 200
7000 45 74 109 146 215

[Excaliber]

Tommy, I actually followed that!

[dbn04]

thanks for the info guys , i new someone on here would have the answer

[750hp]

It depends - if you have armfuls of opposite lock on the steering wheel and smoke blazing off the tyres, then your engine revs won't match road speed....

[Cameron Parsons]

Craig,

Now only a man who drove a Cobra that would wheel spin 'just' before breaking the sound barrier would say that

Cameron

[BMK]

Tommy

Took me a little while to work it through but that makes sense..

Well done mate

[OZVENOM]

Hey Craig i think its about time you adjusted the valve lash got some avgas and took the beast out to the track and realy put it thru it paces. if i was 6 inches taller i would offer to come over and do it for you.


oz