How many People

[Anthony]

hav had a new gear box on there bravo can u tell me what model aswel please
could you also tell me has this happened after lowering the car
and also if you hav put bigger wheels on??
thanks

 

[Dan]

Fiat Bravo 80sx Formula 1.2
2001 Y Plate
25,000 miles
Only been driven by myself and my mum so i know it's not been screwed


i had a new gearbox and clutch put on my bravo last week.
the car was still under warranty (2 years 11 months into it)
the car has not been lowered and has the original 15" alloys on it.


are you having a problem with your gearbox yeah?

 

[Anthony]

not yet dan but i was jus seein if most of the people that hav changed the suspension and wheels hav had to get a new gear box
i know that lowerin it put more stress on the gear box so im worried about doin but still will!!

 

[Anonymous]

more stress??? hows that?? i can see more stress on the diffs but not on the gear box surely

Smee

 

[Dan]

oh right i didn't know that?

is this right tom?

maybe i shouldn't lower my car then

 

[alan]

there is potential to put a greater force on the clutch and gearbox with bigger wheels but at the end of the day it's down to the driver more than anything. The clutch will be the most likely to suffer

Basiclally the moment applied to the drive shaft is proportional to the force and the distance. if we assume the force put onto the road is equal regardless of wheel size then the moment on the shaft is proportional to the radius of the wheel, thus bigger wheel, bigger force.

 

[Anthony]

the diveshaft is set at an angle when lowerin it, it move the drive shaft down and makes it straighter i think which causes more stress on the diffs.
don't hold me to that i was told a long time ago when i lowered my first car didn't listen tho

ok smee

 

[alan]

i dont think lowering it should increase gearbox wear. the ball joints shouls do basically the same job whatever the angle.

 

[Anthony]

well i was told that i dunno, tom if u read this help please

 

[Anonymous]

thats correct ant... but u wont notice the diffence its only for racing for optimum performance under max accel u want the wheel, drive shaft and the diff on a perfect...

Smee

 

[Tom]

Right, lets set everyone stright:

Bigger wheels = more stress on CV joints, DIFF, GEARBOX, CLUTCH and ENGINE.

The driveshaft angle puts stress on ONLY the CV joints. The greater the angle the more stress. The flatter the driveshaft the LESS stress.

Lowering makes bugger all difference to CV stress, the difference in driveshaft angle is minimal and 95% of the CV joint stress is caused when you steer. Lowering will not affect the gearbox.