What diff ratio ve series 2 sv6

[nonricer]

some calculator the website is
http://www.enormouslysideways.net/calc.html
i entered 245/45/18 tyres with 2150 rpm with a 0.67 overdrive and a 4.11 diff ratio

 

[mikey-]

Might just be an issues with the actual outer circumference of your tyres compared to your theoretical circumference.

 

[nonricer]

just made sure the tyre sizes such as diameter and circumference were correct and it appears that they are according to
Tire Size Calculator

 

[nonricer]

just checked another calculator with the same specs and it was 61 mph at 2150 rpm, the website is
Top Speed Calculator

 

[nonricer]

if this is really the case with 2150 rpm at 100 km/h this seems to be a very good gear, but you have said that it would rev at 2400-2500 i cant see how it would be so much variation.

 

[mikey-]

Ok here I go....

My car does 1500rpm @ 100kmh.

I have a 3.45 diff ratio and a 6th gear ratio of 0.5 : 1

Presuming a SV6 had the same gear ratios as an auto V8 you would have a 6th ratio of 0. 67 : 1 and want to fit 4:11 diff gears.

1500 * ((4.11 * 0.67)/(3.45 * 0.5)) = approx. 2400rpm

This is purely for cruising, without even going into the fact that the auto box has a MUCH shorter 1st and 2nd gear than the manuals.....

 

[nonricer]

OK so 2150 is theoretical and 2400 is reality is that what you mean.

 

[mikey-]

No? 2400rpm is theoretical, and reality....

 

[EnFoRcEr_001]

Non ricer you are not factoring in your current diff ratio, sv6 series 2 come out with 3.27 ratio. Jumping to 4.11 is heaps, some one please correct me but I'm pretty sure your increase in rpm at 100 would be close to 40%. So your looking at roughly 2700rpm at 100km/h. Have fun.

 

[EnFoRcEr_001]

6th gear ratio is 0.67