Honestly I never looked into it. Sometime years back I saw something with a 98-02 RX-7 in Japanland with a 6spd in it. But I just did a quick skim of the web and I'm guessing I saw something a little out of the norm that time awhile back. Maybe it was a Getrag ot BW or Tremec unit.

Either way, a 20B + 6spd would be what I'd go with.

 

Yeah having been in the rx7 scene and owned an fd, I'm pretty confident that there is no
Factory 6spd.

 

I don't know about "terrible" but they can't handle street tire wheel hop on a Viper running 6psi. I helped pick up a bunch of large pieces of the tail housing at the track down at Bradenton Motorsports Park one afternoon. It was said by others there that it was no big deal because Vipers **** drivetrain parts all the time.

 

There's a pretty active thread on rx7club right now about a partial pport engine a shop made (Definedautoworks) with staged butterflies on the p-ports mated to a stock intake, and a whole bunch of badassery that dyno'd over 420RWHP at around 10k rpm.

That is THE 20b for me

 

Well no **** that it would make over 400...p-ports! (the best sounding ports). I know Rick Engman made a little over 340 @ flywheel with a stock 20B deturbo'd and with a custom exhaust manifold and tuning on his engine dyno. I would imagine that a 20B with S5 rotors, better intake and mild porting would be damn near 400hp. At the point at which I can afford a 20B swap, it would have a full p-port...and be turbo.

 

LS9 with a set of ported heads and a smaller pulley. The trans would have to be a TR6060 and a 7.5 rear end with 3.27 gears and a trutrac.

The T56 is not a bad transmission once built, but they do have flaws out of the box. Paper frictions and stamped keys come to mind. I eventually have to pull mind down and replace those before it gets locked in 3rd, 4th, or reverse (yes, I've had them stuck in ALL those gears before)

 

Gorden monsen on rx7club has a street ported 20b with s5 rotors and a stoke intake lim/uim and iirc made 375whp at like 8700rpm. After dabbling with turbo rotaries for quite some time I think that n/a is the way to go for reliability.