4 points - 1st is it should be a 75-85 viscosity oil, NOT an 85-140! 2nd is that it's over-filled! 3rd is that both those things will increase viscous drag and cause the diff' to run hotter than the correct oil and level would have. 4th is that the apparent power didn't reflect that because the axles and wheel assemblies were turning slower, so less parasitic power losses there.
Horsepower is torque times rpm. Engine produces the same hp with diff gear change So if you reduce diff gear, you make same WHEEL horsepower, but at a lower rpm (kmh wheel speed) But for the lower rpm you increase the torque. So more torque number times lower rpm = same hp. I think if you measured RPM instead of wheel speed, you would have had the same dyno graph before/after give or take tolerances/the calculations the dyno was doing. Quick maths. You looking for a mehcanic?
the fact it spits out 2 torques at the same horsepower and revs just proves that everything is a lie and it should be measured in how much it puts your head in the headrest out of 10
Take that as good validation that your dyno is accurate and reliable. The dyno measures tractive effort and roller suited, then calculates power from that. Although the diff gears generate higher torque, they do so at a lower roller RPM, hence you end up with the same peak power figure. A lot of dynos will show some varience, it's a good sign yours was that close.
Nice work fellas. If you want the sh*t-hot traffic light to traffic light acceleration, 3.9:1 is a good choice. The reliable all-rounder is 3.08:1 (or thereabouts). Any diff with a 2 as the first number might give highway cruisability and fuel efficiency, but will tend to be a bit of a slug.
Well done, that is the ONLY other comment that showed any intelligence! 👍😎 If they selected different gearbox gears that gave a similar "road speed" on the dyno', it would be even more informative.
4 points -
1st is it should be a 75-85 viscosity oil, NOT an 85-140!
2nd is that it's over-filled!
3rd is that both those things will increase viscous drag and cause the diff' to run hotter than the correct oil and level would have.
4th is that the apparent power didn't reflect that because the axles and wheel assemblies were turning slower, so less parasitic power losses there.
Horsepower is torque times rpm.
Engine produces the same hp with diff gear change
So if you reduce diff gear, you make same WHEEL horsepower, but at a lower rpm (kmh wheel speed)
But for the lower rpm you increase the torque.
So more torque number times lower rpm = same hp.
I think if you measured RPM instead of wheel speed, you would have had the same dyno graph before/after give or take tolerances/the calculations the dyno was doing.
Quick maths. You looking for a mehcanic?
the fact it spits out 2 torques at the same horsepower and revs just proves that everything is a lie and it should be measured in how much it puts your head in the headrest out of 10
I also was wondering how did gears would affect the dyno . Awesome video cheers lads
I just stumbled across this…. Subscribing now…
Appreciate it mate
Take that as good validation that your dyno is accurate and reliable. The dyno measures tractive effort and roller suited, then calculates power from that. Although the diff gears generate higher torque, they do so at a lower roller RPM, hence you end up with the same peak power figure. A lot of dynos will show some varience, it's a good sign yours was that close.
Solid point to be honest
Faaahk brother those shorts are a bit how ya going 😳
👀👀👀
Nice work fellas. If you want the sh*t-hot traffic light to traffic light acceleration, 3.9:1 is a good choice. The reliable all-rounder is 3.08:1 (or thereabouts). Any diff with a 2 as the first number might give highway cruisability and fuel efficiency, but will tend to be a bit of a slug.
100% it’s still good in 6th at crusing speed the 2:0 ratio is junk
i swapped the 2.7 out for a 3.08 and now I am actually able to use 6th gear
Yeah same I used to never go above 4th there is no need
You'll feel the torque.
100% as much as the power is the same the drivability is so much better and less boring
i got a wl stato with a ly7 in it and she had fuck all go on the 2.87 put a 3.08 in it and a turbo on it and she gos about as good as a stock vy LMFAO
😂😂😂😂
Sucks that you didn't (couldn't?) set the graph to RPM so the before/after power/ torque overlaid properly...
You definitely can and I’ll get that graph and update you because that is a much better way to compare it,
Well done, that is the ONLY other comment that showed any intelligence! 👍😎
If they selected different gearbox gears that gave a similar "road speed" on the dyno', it would be even more informative.