Thread: 20V Transmission 6 Speed Flywheels

JWT 250mm Flywheel

The JWT flywheel had the face that was hanging out past the ring gear. The picture below shows the JWT flywheel with the side already machined but it still hangs out past the ring gear. The silver aluminum side of the flywheel is what touched the inside of the bellhousing by the stater. So you would have to grind out the bellhousing until there was a hole.

JWT tried to make this flywheel to fit both the S15 and P12 trans but it only works properly on the S15 and not the P12.




JDM NISMO Flywheel & Clutch Cover S15 SR20DET TOMEI

Here is a picture of the Nismo Flywheel for the S15. This should be a 240mm clutch setup. As seen in this picture the ring gear hangs out past the flat surface of the flywheel. It seems this flywheel would work in the 20V trans but I am not 100% sure. I would say 85% sure.








Even after shaving down the side of the JWT flywheel it still sticks out past the Nismo verison.


Mazwork 215mm 6 speed flywheel.

This flywheel seems to work but it is only good for NA use or use up to 450 WHP. If this flywheel was made 225mm it would have worked for both turbo and NA aplications






If the 215mm Mazworx flywheel is 10 pounds, then a properly made 225mm 6 speed aluminum flywheel should way about 12 pounds

never mind. lol Just didnt wait for you to fill in the info.

And why would JWT as great as they have been over the years allow for a product that would be that way, anything requiring major grinding is rediculous coming from a company like that.

Care to find out Miko? lol. I can do a little test fit for you to see if a 240mm clutch setup clears the p12 bell housing. I will of course send it back to you as its not gonna hold with my setup but i do have the motor and trans out to do a quick test fit.

LMK

I am going to find a pic of the Mazworx 215mm flywheel 6 speed flywheel.

I dont see why it wont fit. In a side by side comparison the later part of the bell housing (closer to the gearbox) definetly looks larger in overall size as the gearbox is quite a bit larger as well. The inside of the p12 bellhousing is also very smooth and doesnt have all that webbing that the b13 trans has. So there could be enough room.

What size clutch does the p12 normally come with.

here you go miko



appears to sit well below the ring gear, maybe even more so than the s15 flywheel

The P12 clutch is 225mm.

I need to get someone to tell me how much more surface area a 225mm clutch has over a 215mm clutch.

Doing the calculation off of the top of my head the surface diffrence should be the 2 flywheel sizes should be 16% larger but I could be wrong.

no surface area should only be about 4% being thats how much larger the diameter of the 225mm clutch is compared to the 215mm clutch, it basicly applies the same when calculating how much larger one injector is to another when tuning the safc.

If your looking for contact area of the clutch to calculate how much more holding power it will have then that can depend on the contact area of the disk as well.

But as far as size goes its only 4% larger

You need to go back to math class. 225 might be 4% larger than 215 but this is a circle and the percentage is larger. You might need to take a look at how to calculate the area of a circle and then come back.

Alright, did the math, as far as surface area goes its 8.6% larger This time i know im correct. lol

And that works out when i check the work as well so There you go.

I originally thought you were talking about outter diameter differences. lol

You always stater the obvious but miss the point.

Yes that is the case. it is made directly off of a SR20DE flywheel but about 1/2 inch thicker.

The flywheel first off needs to be 1.1 inch thicker than the SR20DE factory flywheel to be within specs of the 20V flywheel. Problem 1.

If the flywheel was made at 225mm it would have been able to accomadate both NA and turbo or better put it would have been good for 650 WHP with 550 Lb Ft Torque safely on a 2000-2400 pound SER.

All this while the weight of the flywheel would have been no more than 13 pounds, perfect for both turbo and NA.