Adding TSX 6th gear to A3 tranny

[mp_02si]

Cool thanks for all the info. I work at Honda so I just checked the part numbers for the cones and they are the same part number between the ep 5 spd and the accord. So that means it should fit 100% no problems.

[lemonhead228]

Man I thought that tsx package deal they sell on clubep3 is all I need cuz that's what they said.. I guess Ima have to do more research before I do it. Hopefully it isn't to hard to do

[AKEP]

As long as the synchro is the same type (2 cone VS 3 cone) then it should work in either the 5th or 6th gear position.

all synchros after 1-2 are the same. and i thought they were all single cone? i know 1-2 are triple coned...

or are they called that?

Man I thought that tsx package deal they sell on clubep3 is all I need cuz that's what they said.. I guess Ima have to do more research before I do it. Hopefully it isn't to hard to do

its only if you already had a 6 speed. just $200 more and y ou can convert the 5spd to a 6spd like me =] its pretty sweet...

[Ba82Ep3]

all synchros after 1-2 are the same. and i thought they were all single cone? i know 1-2 are triple coned...

or are they called that?

Thats a good question, one i havent seen answered as of yet. In my CSX.pdf (Canadian k20z3 trans) they show a triple cone for 1-4 and then call a double cone for 5-6. Funny thing is the double cone looks just like the EP's syncs (what we commonly call a single cone). So, are they including the cone that is part of the gear in that case?

My thinking is... the synchro is a separate assembly from the gear... so a triple cone synchro has 3 pieces to it (not including the spring ring). If thats the case... then 3-5 are single cone, since there is only one piece to the sync. Thats partially my bad for not going into that a little more... but i figured most people wouldnt read all that typing anyways. lol

So i guess its open to interpretation until someone can definitively answer that question... but the pdf manuals are inconsistent from model to model.

[03 inspire]

AK wanna show me how to rebuild one :) and where can i find a OBX lsd

[lemonhead228]

You know much would it cost to convert the a3 to a six speed? I'm doing the labor myself.

its only if you already had a 6 speed. just $200 more and y ou can convert the 5spd to a 6spd like me =] its pretty sweet...

[mr-alternative]

Dont want to start a thread:


I have a 2003 Civic Type R, which had a totaled title by insurance and was parted out.

Bought it and rebuild it as a track-car.

I have got the K20A2 installed with a 5 speed Civic Type S tranny, its the NRE3 tranny, should be the same to your ones.

Have done a test drive yesterday and saw thats fully rubbish at the moment for a track car.

All gears have got a too high gaer ratio ( 4th and 5 th seems to be similar to the NPQ3 6speed tranny).

At the moment i have gear ratio resulting followong maximum speed in gears:

1st gear: 70 kph
2nd gear: 130 kph
3nd gear: 170 kph
4nd gear: 210 kph

would be better with following:

1st: 45 kph
2nd: 90 kph
3nd: 130 kph
4nd: 170 kph
5nd: 210 kph

Have got anyone ideas how to change that or may have done such a conversion?

[Ba82Ep3]

Assuming you have a 4.7FD, you could switch that to a 5.0FD. But if you have a 4.3FD then a 4.7FD would be the easiest to do (and cheapest).

The RSXS 6 speed is 4.3FD
The EP 5 speed is 4.7FD
The JDM CRV is 5.0FD... or aftermarket

You mentioned a TYPE-S 5 speed tranny... so im a little confused there.

Otherwise you need to track down an ITR/CTR trans for the gears... which can be the costlier option....

[mr-alternative]

Had a look to the specifications:

tranny code is NRF5 and got followong gear ratios:

1st: 3,266
2nd:1,769
3th:1,212
4th:0,972
5th:0,780

Final drive: 4,388

This results a top speed at 8000 rpm:

1st: 64 kph
2nd: 118kph
3th: 173 kph
4th: 216 kph
5th: 269 kph (gear ratio is way too long, in real 240kph speedo reading)

I have done some research and found out that a 5,0 Final drive would bring following result:

1st: 56 kph @ 8000rpm shifting to second gear about 4300rpm
2nd: 104 kpg @ 8000rpm shifting to 3d gear about 5500 rpm
3d: 152 kph @ 8000rpm shifting to 4th gear about 6400 rpm
4th: 189 kph @ 8000rpm shifting to 5 th gear abotu 6400 rpm
5th: speed at 8000rpm 236kph

So the gear ratio with a 5,0 Final drive would be ok and shifting would bring the engine RPM near to VTEC engagment point or into VTEC timing.

Now i need OEM part no.s for such a final drive or aftermarket ones.

Saw a OBX one at ebay.com, will that stuff work or is it trash?

After brands also welcome, so please tell me these.

[Ba82Ep3]

You can look on ClubRSX for some info there. The only place I know other than that is a stateside Honda dealer named AutoFair Honda. They are a vendor on k20a.org. The OEM 5.07FD has the ring gear, countershaft, and lower bearing as a package for $450 shipped.

The 4.7 would be much cheaper since you can source it from a US spec EP 5 speed. You can also find them used for sale for a lot cheaper than $450. For instance, I have a 4.7FD left over after rebuilding my trans. They usually go for 100 to 150 depending on mileage

[mr-alternative]

What a nonsence Honda has done?

So they build a 5speed tranny with 4,7 final for US Market which is powered by a K20A3 and for europe's 5 door model with k20a3 the used a 4,3 final drive... such a nonsense.

Plus the Civic Type R also got a 4,7 final.

@Ba82Ep3, PM me for pics and price for the 4,7 final you have got, please.

[lldiesel386ll]

didnt check into the gear ratios, but a 5 speed with a 4.3 makes me think that the civic type s transmission youre referring to is not very different from the base rsx transmission, andre

[AKEP]

http://www.k20a.org/forum/showthread.php?t=6395
http://www.zealautowerks.com/transcalc.php

jdm crv it is, also 07+ CTR.

get that crv 1st gear too,
02-04 type-s 2nd-4th
04-08 CL9 (USDM only?) TSX 5th gear
01-05 ITR 6th
07+ctr final

3.533
2.13
1.517
1.147
0.921
0.825
5.062fd

56kph or 35mph
93kph or 58mph
130kph or 82mph
174kph or 108mph
204kph or 128mph
241kph or 150mph

green is base rsx gearing, blue is this "custom" short gearing.

you're welcome.

ps. i don't know if that would all work fine and dandy with the shift forks, and god knows what, but im guessing its all the same, as long as you were using a ep3 (for 5 speed) or 02-04 type-s (for 6 speed) i don't see why it wouldn't drop in like a tsx 6th... i mean the rsx uses an ep3 5th gear for a 6th gear if you catch what im saying, it looks like it doesn't matter what goes where as far as gears are concerned.

[mr-alternative]

http://www.k20a.org/forum/showthread.php?t=6395
http://www.zealautowerks.com/transcalc.php

jdm crv it is, also 07+ CTR.

get that crv 1st gear too,
02-04 type-s 2nd-4th
04-08 CL9 (USDM only?) TSX 5th gear
01-05 ITR 6th
07+ctr final

3.533
2.13
1.517
1.147
0.921
0.825
5.062fd

56kph or 35mph
93kph or 58mph
130kph or 82mph
174kph or 108mph
204kph or 128mph
241kph or 150mph

green is base rsx gearing, blue is this "custom" short gearing.

you're welcome.

ps. i don't know if that would all work fine and dandy with the shift forks, and god knows what, but im guessing its all the same, as long as you were using a ep3 (for 5 speed) or 02-04 type-s (for 6 speed) i don't see why it wouldn't drop in like a tsx 6th... i mean the rsx uses an ep3 5th gear for a 6th gear if you catch what im saying, it looks like it doesn't matter what goes where as far as gears are concerned.

NRK5 tranny which habve got some other gear ratio:

1st: 3,266
2nd: 1,769
3d: 1,212
4th: 0,972
5th: 0,78

Final drive: 4,388

This final drive causes very long gears in combination with a K20A2 engine.
Referring to the k20a.org gear ratio graphic the tranny has got exactly the 1st, 4th, 5th and 6th gear from the JDM CTR 6 speed tranny, which is also shorter.

Thats why i'm thinkng about usinf just a stock 4,7 final drive or a 5,07 JDm final or obx racing / skunk.
i'm thinking about replace the second gear and install a normal CTR 2nd and 3th gear plus take the exisitng ones for a 4th, 5th and th gear.

The car should be used for track-days at different raceways, but pereferly the setup should be good for Nurburgring raceway.
This raceway needs a short tranny so VTEC is engaged nearly all time for fast laps.

[Ba82Ep3]

1st and 2nd are part of the mainshaft... so you will have to get the matching mainshaft for the 1st and 2nd countershaft ratio you choose.

So, mainshaft follows countershaft 1st and 2nd.

Ring gear follows countershaft.

You cannot mix triple cone synchro gear sets with gears that have less synchro cones. For instance, you CANT use an ITR 3rd and EP 4th as 3rd and 4th on the same mainshaft (countershaft 3-6 gears are interchangeable though). The design of the synchro hub, the gear, and the synchro itself wont allow the mix. It will physically fit, but it moves the remaining gears up the mainshaft (increased tolerance), and offsets the synchro sleeve in relation to its shift fork.

You CAN use two of the same in the same gear set. For instance you CAN use EP 3rd and 4th as 3rd or 4th, and then ITR 5th and 6th as 5th and 6th. EP gears have the same sync types, and ITR gears have the same sync types. But, why would you want a single or double synchro cone on 3rd and 4th gears if its a track car? Triple cone is your best bet.

If you cant find OEM ratios you want within the same synchro type (1/2 and 3/4 and 5/6), then your other option is a custom gearset. I have a feeling after you look at THAT pricetag... adding a 4.7 or 5.07FD to your existing trans sounds like a much better option.