6-speed conversion questions

[JD Cross]

I am thinking about converting my 91 to a 6-speed.
Could anyone who has done this please let me know what parts ( inaddition to the 6 speed) are needed to do the conversion properly.
Advice on whether to retain the two disk clutch or go with the single would be appreciated

Jim
91 blk.blk

 

[queenlives]

I am thinking about converting my 91 to a 6-speed.
Could anyone who has done this please let me know what parts ( inaddition to the 6 speed) are needed to do the conversion properly.
Advice on whether to retain the two disk clutch or go with the single would be appreciated

Jim
91 blk.blk

i believe this has been covered extensively over the years. the threads can probably be found using the search feature of prime.

 

[Ojas]

Get a conversion kit (like the one from Science of Speed or Comptech), which includes the electronic reverse lock-out that will ensure you don't nick reverse accidently.

The main thing is the clutch/flywheel: If you have one that will work with the 6-speed, you should not need anything else. It's possible to use the dual-disc setup, but you'll need to buy an NA2 NSX-R Input Shaft and have it installed. It's probably more cost-effective to just go with a 6-speed clutch/flywheel (unless you were planning on cracking the transmission open anyway - perhaps to have it rebuilt, replace synchros, etc.). Get flywheel bolts, too.

You might want to replace your slave cylinder while you're at it, especially if you go with a firmer clutch.

BTW: As queenlives stated, you can find more info if you search (try: "6 speed conversion").

BTW 2: I have a 6-speed conversion setup for sale.

 

[darknezz_ghost]

almost 6k.. might as well invest in a supercharger or turbo.. :wink:

 

[ScienceofSpeed]

The usual parts list:

Honda 6-Spd Transmission
Electronic Lock Out Box
RPS Clutch (or)
NSX-R input shaft to use the factory 5-spd type clutch

This is a great time to put the 4.23 final drive into the 6-spd transmission.

-- Chris

 

[rickysals]

How much of a price difference is it from doing the whole 6speed conversion, to simply selling your '91 and buying a '97??

 

[timothyaw]

The usual parts list:

Honda 6-Spd Transmission
Electronic Lock Out Box
RPS Clutch (or)
NSX-R input shaft to use the factory 5-spd type clutch

This is a great time to put the 4.23 final drive into the 6-spd transmission.

-- Chris

What benefit does putting the 4.23 final drive on a 6-spd transmission accomplish? I'm just curious.

 

[Synthesis]

How much of a price difference is it from doing the whole 6speed conversion, to simply selling your '91 and buying a '97??

good point...

 

[ak]

How much of a price difference is it from doing the whole 6speed conversion, to simply selling your '91 and buying a '97??

Price difference is somewhere in the ballpark of 10-15k. Also remember that number of units sold 97 and up are very much smaller which means it'll be much harder to find well maintained ones and it'll be costly.

 

[dave22]

Also, not everyone wants other upgrades that came between '91 and '97.

I'd prefer a 6-speed '91-'92 myself just because I'd rather not have a 3.2, a passenger airbag, or a -T.

 

[Ojas]

dave22 makes a good point. For example, I prefer having no power steering (there are not many 1997+ that don't have power steering).

Besides the NA1 vs. NA2 differences, I think it's wise to be careful about entering the clutch/flywheel into the "upgrade cost" of conversion. It's a consumable item. If your 5-speed clutch is about to go and you like the idea of 6-speeds, it might be a good time to upgrade. The cost of the clutch/flywheel is essentially a wash and incremental labor cost is relatively small. You can also sell your old 5-speed transmission for maybe $1000-1500. Your new transmission will likely be less worn (syncros, bearings, etc.) than your old one, too.

If you have a 5-speed with a clutch that's near the end of its life, the net cost to upgrade to a 6-speed could be about $3000 (used 6-speed) to $4500 (new 6-speed) once you sell your old 5-speed.