S15 6 Speed Transmission for Dummies

[LoneWolfK16]

Originally Posted by TheRealSy90

Like they say, get an unsprung clutch disc since you're using the dual mass flywheel. That's all.


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This doesn't answer my question what so ever.

[LoSt180]

Originally Posted by LoneWolfK16

This doesn't answer my question what so ever.

It does, sorta. Either of those clutch kits will work with the dual mass flywheel. The diameter of the disc and the mount points of the pressure plate are all the same. There are no physical differences between the 14 and 15 clutch apart from the 14 ones have springs in the friction plate to absorb harsh loads. S15's don't 'need' this as the dual mass fly does the same job but fitting a S14 clutch to a S15 will not be detrimental at all.

Personally (just an opinion of a guy on the internet), I'd get rid of the dual mass flywheel and find a good lightweight flywheel. It will need to be S15 specific due to the flywheel being physically thicker than the S13/S14 one. If converting to a single mass lightweight flywheel, then you'd probably want to consider a sprung clutch (ie a normal SR clutch kit available).

[LoneWolfK16]

Originally Posted by LoSt180

It does, sorta. Either of those clutch kits will work with the dual mass flywheel. The diameter of the disc and the mount points of the pressure plate are all the same. There are no physical differences between the 14 and 15 clutch apart from the 14 ones have springs in the friction plate to absorb harsh loads. S15's don't 'need' this as the dual mass fly does the same job but fitting a S14 clutch to a S15 will not be detrimental at all.

Personally (just an opinion of a guy on the internet), I'd get rid of the dual mass flywheel and find a good lightweight flywheel. It will need to be S15 specific due to the flywheel being physically thicker than the S13/S14 one. If converting to a single mass lightweight flywheel, then you'd probably want to consider a sprung clutch (ie a normal SR clutch kit available).

Now this answered it perfectly. Thanks mane.

[LoneWolfK16]

Originally Posted by LoSt180

It does, sorta. Either of those clutch kits will work with the dual mass flywheel. The diameter of the disc and the mount points of the pressure plate are all the same. There are no physical differences between the 14 and 15 clutch apart from the 14 ones have springs in the friction plate to absorb harsh loads. S15's don't 'need' this as the dual mass fly does the same job but fitting a S14 clutch to a S15 will not be detrimental at all.

Personally (just an opinion of a guy on the internet), I'd get rid of the dual mass flywheel and find a good lightweight flywheel. It will need to be S15 specific due to the flywheel being physically thicker than the S13/S14 one. If converting to a single mass lightweight flywheel, then you'd probably want to consider a sprung clutch (ie a normal SR clutch kit available).

Turns out the clutch inside the car was a NISMO Super Coppermix and I was not able to install the new ACT due to the flywheel being totally different than stock.

Lesson learned..

[TheRealSy90]

Yep, just get an aftermarket flywheel with the specific offset for the s15 transmission, and then you can use any s13/s14 aftermarket clutch.

[LoneWolfK16]

Originally Posted by TheRealSy90

Yep, just get an aftermarket flywheel with the specific offset for the s15 transmission, and then you can use any s13/s14 aftermarket clutch.

Ehh, rather keep the dual mass on. Its really nice when daily driving.
Thanks for the input fellas.

Hope the ACT clutch works. Cheers

[TheRealSy90]

You'll want an unsprung disc on a dual mass flywheel.


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[ShakotanGazelle]

I had the nismo coppermix sports clutch kit which is a lightweight single mass steel flywheel, and a full face unsprung clutch disc and it felt amazing, relatively easy pedal feel but still incredibly sporty feeling. Best way to describe it would be like a Porsche gt3 or similar kind of sports car.

[dwnshft2drft]

Originally Posted by ShakotanGazelle

I had the nismo coppermix sports clutch kit which is a lightweight single mass steel flywheel, and a full face unsprung clutch disc and it felt amazing, relatively easy pedal feel but still incredibly sporty feeling. Best way to describe it would be like a Porsche gt3 or similar kind of sports car.

I have the same kind but after installing the nismo coppermix kit, then created issue engine stalling and shuts off before stopping traffic lights. So kept doing heel toe all the time. Some say its the flywheel too light? Did you adjust TPS or change throttle body? Any help would appreciate it.

[Eoken]

Time to do a little 6 speed work! I am doing a S15 six speed swap on my blacktop S13. I will be making a custom drive shaft and be running a S15 HLSD with a 3.69 ring gear to get the S15 stock gear ratio. Here is what I had found out installing my SR20DET 5 speed VSS drive gear onto the outputshaft of the S15 6 speed. Hope his info helps people!







S13 VSS Drive gear was bored out by hand from 25.0mm inside diameter to 27.9mm using a round file (I have seen some people say 28.0mm but I kept checking it with my caliper and got 27.9mm...). The steel ball that keeps the drive gear rotating interdependently from the shaft sticks out 5.1mm when installed in its hole. I used a small green rotary tool bit to make the half circle in the drive gear deeper to fit the ball. I then used two a 1-1/18 inch external snap rings to secure the drive gear from moving up or down. to do this I had to take off a mil or two off the top and bottom inside portion of the gear and notching out a place for the ends. It fits well and the S13 VSS installs smoothly and seems to spin nicely when I spun the output shaft when it was all back together. I know people have talked about doing this but I might e the first S13 guy to try it lol! If you are interested in any more details/ methods/ tools just let me know and I can help.

[LoSt180]

Wow, beautiful work and great detail. My question is will your speedo be off since you're using the S15 3.69 FD, and the S13 was 4.08. I forget about the interchangability of sensors, but S14 SR had the 3.69 FD also.

[Eoken]

Yes, I will need to use a speedo correction kit like a yellow box or similar product. But it should be very straightforward since the signal will not have to be converted.

[Eoken]

does anyone know where I can find the torque specs for the rear transmission housing (using 12mm bolts for the 6 speed? it is mentioned in the original post make sure to torque them to spec but the spec is not mentioned.

I have looked in the SR20DET S14 factory service manual and it is not even mentioned for the 5 speed in there >. >

FSM:http://www.240edge.com/manuals/s14_sr20det.pdf

the transmission section starts on page 369

[LoSt180]

Originally Posted by Eoken

does anyone know where I can find the torque specs for the rear transmission housing (using 12mm bolts for the 6 speed? it is mentioned in the original post make sure to torque them to spec but the spec is not mentioned.

I have looked in the SR20DET S14 factory service manual and it is not even mentioned for the 5 speed in there >. >

FSM:http://www.240edge.com/manuals/s14_sr20det.pdf

the transmission section starts on page 369

Check the S15 manual, may be in there: http://www.nicoclub.com/FSM/240sx/S15/S15/

[Eoken]

top work loSt180, you lead me right to my answer! 22-28ftlb

[TheRealSy90]

Those are VERY good clutches. Honestly one of the best available. I'd seriously look into refurbishing that clutch lol.


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[LoneWolfK16]

Originally Posted by TheRealSy90

Those are VERY good clutches. Honestly one of the best available. I'd seriously look into refurbishing that clutch lol.


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Yeah I thought about just replacing the disc, but both the fly wheel and pressure plate have severe heat spots all over. The clutch disc was inspected and gauged and still had plenty of life on it. But yet its starting to slip. Its been in the car for about 4-5 years now. Probably gonna just but a new one from.

[TheRealSy90]

Should be able to get the flywheel resurfaced and maybe a replacement pressure plate ring? Rhd Japan has lots of clutch refurbish stuff but never looked for that one specifically.


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[Busted_daily]

Hey so after reading if I went with the 6puck white bunny package which is competition clutch and aftermarket flywheel it should work fine with s15 6speed trans

[TheRealSy90]

S15 trans needs an s15 specific flywheel.


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[joaquin714]

Can I use a s15 clutch flywheel combo on a s13 sr? I know physically it will bolt up but curious if the throw out has diff.

[TheRealSy90]

Originally Posted by joaquin714

Can I use a s15 clutch flywheel combo on a s13 sr? I know physically it will bolt up but curious if the throw out has diff.

You can if you also use the s15 6sp transmission.


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[s13vette]

Links to buying 6speed flywheels?

[LoSt180]

Originally Posted by s13vette

Links to buying 6speed flywheels?

www.google.com

[Fastimport]

Does anyone know what these weigh?
Considering bringing one in from Japan to do surgery on the bell housing so it will bolt on to my L-series truck engine.

Would be nice to know ahead of time what shipping will cost.

[Fastimport]

[QUOTE=Fastimport;6235312]Does anyone know what these weigh?/QUOTE]

OK, this thing weighs 92.6 lbs without throw-out assembly, for inquiring minds.

The one I picked up off Yahoo-JP turned out to be an HPI close ratio.
And since it is good for 430HP, it's going into my Cressida.
I'll pick up another for my old Datsun L4.

[Goldhawg]

Anybody have a part number for the slip yoke? I didn't get one with my tranny and need one and I was told it would be the same as the automatic 240SX but can't find a part number online.

[Fastimport]

Originally Posted by s13vette

Links to buying 6speed flywheels?

I have bought these flywheels out of Japan for 15 years, sold hundreds of them, and never an issue.

https://page.auctions.yahoo.co.jp/jp/auction/q172944733

And at the very top is a link to 'Buyee', which is Yahoo's forwarding service.

The only reason I no longer sell flywheels is because of the stinking chinco crap being sold for shit low prices.
You know, the shiny black ones that everyone who deals in chinco shit to make a fast buck at the end user's expense.

[slow_sr20]

I’ve got a stock dual mass flywheel if anyone is looking. I lucked into a autech for my build.

[Fastimport]

Well, I just bought one of them, so I will find the weight once I have the shipping bill, no problem.

Now I need to find one that has blown, as I would like a spare bell hosing to modify to fit an L-series engine.
Someone must have a one that they blew...