Using FD2R 5.062 Final Drive?

[plAythiNG]

Hey Guys,

so its time for me to upgrade my drivetrain in the next 6-12 months so doing some planning and seeing what your opinions are.

K20Z1:

-Injen CAI
-TODA Header
-Spoon N1 catback
-KPRO 138atw
-235/40/17 direzza Z1 tyres

I have since purchased;

Wavetrac LSD
Exedy Stage 2 clutch
EP3R 4.7Kg lightened flywheel

I am possibly looking at getting the FD2R 5.062 Final Drive and a TSX/Accord Euro 6th gear

I use the car 2-3 times a week with city/highway driving, in addition to the track day approximately 3-6 times each year.

I want to know if it be worth it installing the FD2R FD for my car and also the 6th gear from a TSX to keep revs down on highway driving?

Opinons? How much extra on top will it cost to install final drive? Worth the effort?

[Pizzo321]

FD is about $600 plus it's close to $700 for install, gearbox has to be pulled out

[Norm]

I doubt you will be able to get 700 including fd change. Possibly close to 1k. But the shorted fd does make a big difference. Question is whether you can bear it at high rpm on long drives. I'm fine with mine but I barely go on the freeway anyway.

Norm

[Stephen_AUS]

Well if he gets the TSX gear, he should be fine.

[Pizzo321]

I doubt you will be able to get 700 including fd change. Possibly close to 1k. But the shorted fd does make a big difference. Question is whether you can bear it at high rpm on long drives. I'm fine with mine but I barely go on the freeway anyway.

Norm

a simple FD change should be no more then $700, unless you thought i meant 700 for everything? lol

[plAythiNG]

Most liikely made up my mind regarding the 5.1FD.

it will be going in with my clutch also!

Looked at the gear ratio comaprisons and its not that bad! plus DD, i spent hardly anytime in any of the gears except for 6th gear... so it wont really be an issue for me. Looking forward to see its change on the track!

[Norm]

a simple FD change should be no more then $700, unless you thought i meant 700 for everything? lol

You do understand what's involved in a final drive change right? 400-550 for flywheel and clutch, 500-700 for fd change alone? Please ask your mechanic for a more accurate price. Mind you, they are on the forum. And having said that, the cheapest I got my clutch/fly/final drive/rigid collars/carbon synchros was 1k all up. If you look clearly in my previous post, I did mention the word 'including'

Norm

[plAythiNG]

Hi norm,

Sorry i forgot u replied! Yeah sounds about right, if the subframe is going out, veaper to install a fd then, i just wanted to know how much extra for fd on top.

Im also doing spoon rigid collars and also a baffle!

How do u find the final drive neways.. I know u dont have the accord euro 6th gear as u dont drive on highways, curious toyour driving habit, as all my driving on the streets is in 6th also.... Although with the tallergearing ofthe accord 6th, i may havw to cruise in 5th on the street but time will tell.

[TOU93]

I have been quoted $650-800 for LSD, Final Drive and clutch install from shops in Brisbane. That includes removing the box from the car and reinstalling it. They said 2 days to do it.

[Norm]

Hi norm,

Sorry i forgot u replied! Yeah sounds about right, if the subframe is going out, veaper to install a fd then, i just wanted to know how much extra for fd on top.

Im also doing spoon rigid collars and also a baffle!

How do u find the final drive neways.. I know u dont have the accord euro 6th gear as u dont drive on highways, curious toyour driving habit, as all my driving on the streets is in 6th also.... Although with the tallergearing ofthe accord 6th, i may havw to cruise in 5th on the street but time will tell.

The fd change is definitely noticeable, especially when you have upgraded mounts. Im only lucky I don't have to do much highway driving due to the location I'm at. But if I had to do it again, I would probably of added the tsx gear in for extra comfort. You love the extra torque with the shortened fd. Maybe Ill change mine when I decide to change my LSD and add a baffle sump in to. At this point in time I don't need it yet.

Norm

[plAythiNG]

Has your driving changed dramatiicaly ever since the installation of fd? I ahift at 3k rpm every gear, and just wondering how the fd will affect. I do plan on upgrading to k24 in the next several years... (4-5) the fd will become useless then but i would most likely source anoter gearbox for the swap and sell my current one..

[Norm]

Can you still not use a shorterened FD with a k24? Driving has changed slightly. You just change gears quicker mate, because it reaches the rpm quicker. Doesn't actually change your shifting at a specific rpm. You do know what a shortened final drive does right in comparison to longer one?



The final drive is the last gear found before the driven wheels. Depending on its ratio, it determines the number of times the driveshaft must turn before the axle shaft turns once. Using different final gear ratios will achieve different benefits i.e. Increasing the ratio will increase acceleration but will lower the top end speed and vice versa.


The standard DC5 final drive is 4.764, which means the transmission output shaft, after going through the selected gear ratio, turns 4.764 times for every time the wheels go around. As mentioned above, if you increase the ratio you gain acceleration but sacrifice top speed. I had chosen to go for a 5.062 final gear ratio more commonly referred to as a 5.1 final drive.

Essentially this would give a 6.255% difference in ratio from OEM. If I take my estimated torque at the fly which is at 178.6 ft/lb and combine it with the 5.1 FD, I would need an equivalent 189.7 ft/lb of torque with the standard FD to accelerate at the same rate.

The revs are noticably higher by +-500rpm than before. Previously on 6th gear @ 100km/h was on 3000rpm. Now with the same gear and speed, the revs have increased to 3200-3400rpm. It is actually more benefitial to me, one that is because before the 5.062 FD, I was maintaining 3000rpm and the noise from the engine bay was abit droning. But it revving at 3200rpm+, the pitch is less droning and more comfortable to stay at. So in my instance it has benefited me. Some people might hate it for the motorway drives due to the high RPM cruising. But for me, I'm enjoying it. Especially when it accelerates like an animal through the whole RPM band.





Norm

[plAythiNG]

I'll Add to my post above, if i were to go k24, id go k20 head so i can still rev high and even with the shortned fd, i can still rev it out as imo the lower redline on k24 and a 5.1fd wouldnt go too well.

[gunpoons]

nothing stopping you using 5.1 with a k24 but i'd say with the extra torque launching/taking off, first gear would become a bit of an issue, or a bit useless

[fatboyz39]

Invest in a Gear-X close ratio set as oppose to FD and 6th TSX gear. Worth the extra penny