Help working out speeds

[t45_ste]

Evening al, is there anybody that can help me out. Im trying to work out my speeds for the ratios in my box using stuarts calculator, but the results dont seem right.

Here are the ratio's

1st - 2.615
2nd - 1.937
3rd - 1.611
4th - 1.350
5th - 1.160
6th - 1.044

Final drive 4.867

Rev limit 8900

Tyre 195-50-15

Help is hugely appreciated

Ste

[Adam]

Hmm, aye, something in the calculator is definently wrong there

Because comparing it to Ollys box
... 1st Gear 2.54 ~ 55mph
... 2nd Gear 1.76 ~ 79mph
... 3rd Gear 1.42 ~ 99mph
... 4th Gear 1.19 ~ 117mph
... 5th Gear 1.040 ~ 134mph

And thats a 7750 limiter.
But with a 3.74 fd

[t45_ste]

Sorry, i havnt posted up the speeds i was getting as they didnt seem right. I put in the ratios of ollys box too and they came out different to what they should be. Think im doing somthing wrong.

[Stuart]

post the speeds you got out of it.
how else will I fooking know if its broken lol


and are you sure you are going 8900rpm?

[t45_ste]

Speed @ Limit 1st 31.45 Mph
Speed @ Limit 2nd 42.46 Mph
Speed @ Limit 3rd 51.05 Mph
Speed @ Limit 4th 60.92 Mph
Speed @ Limit 5th 70.9 Mph
Speed @ Limit 6th 78.78 Mph

Im on steel rods, omega pistons, bronze guides, solid lifters, double valve springs and dry sump. So shoul be ok at 8900.

Thanks

Ste

[Stuart]

Speed @ Limit 1st 31.39 Mph
Speed @ Limit 2nd 42.37 Mph

Speed @ Limit 3rd 50.95 Mph

Speed @ Limit 4th 60.8 Mph

Speed @ Limit 5th 70.76 Mph

Speed @ Limit 6th 78.62 Mph




they seem low, but then youve got a bonkers FD, and stupid gearbox with no overdrive (ie less than 1:1)

[t45_ste]

I put ollys using in his details and came out with a similar top speed?

[Stuart]

ollys wheel size?

[Stuart]

ill stick the numbers into my spreadsheet at work tomorrow and get you the answer... I need to fix the website

[t45_ste]

Used ollys tyre size. These are the results

Speed @ Limit 1st 36.39 Mph

Speed @ Limit 2nd 52.51 Mph
Speed @ Limit 3rd 65.08 Mph
Speed @ Limit 4th 77.66 Mph
Speed @ Limit 5th 88.86 Mph

[t45_ste]

Thankyou stuart :thumb:

[Stuart]

1st = 47.45mph
2nd = 64.06mph
3rd = 77.03mph
4th = 91.92mph
5th = 106.97mph
6th = 118.86mph

the speeds will be reduced a touch based on tyre pressures and tyre wall strength.

[t45_ste]

Cheers Stuart