18psi

iTrader: (76)

new and improved because your car ACTUALLY runs, so it's a compliment.

he was very entertaining when he wasn't drunk posting

aidandj

iTrader: (5)

I've seen his posts. Looks like a fun guy. Does he still have his Miata? Just gave up on it?

Leafy

iTrader: (1)

Is the 2860 or the aerocharger that can make that boost down low also capable of 450hp?

sixshooter

iTrader: (12)

Is there a Miata transmission solution for 450hp at a reasonable price? Until such time, why would above 350hp matter?

18psi

iTrader: (76)

because then we can say we drive 450hp cars even though they've never been past 250

aidandj

iTrader: (5)

Rx7 trans is pretty reasonable. Ratios just aren't good for road racing so it gets no attention here.

Braineack

iTrader: (62)

How about just build a fast spooling 300rwhp 2560 setup? Compromises.

patsmx5

iTrader: (16)

I need to look into this. With the SC it has plenty of torque, just needs longer spaced gears. A much taller 1st and 2nd would be great.

bcrx7

iTrader: (5)

The RX-7 Turbo transmission actually has decent ratios for road racing shifting @7,000 rpm gets you about 4,500 in 3rd (from 2nd) and around 5,000 anything above that except from 1st to 2nd which is low 4,000. Most turbo cars are making almost max boost in those ranges.

aidandj

iTrader: (5)

Somewhere in the transmissions options thread the rx7 box is dismissed. Not sure why.

bcrx7

iTrader: (5)

Well depending on the amount of power you make (well torque), they can have issues with 3rd gear on track (north of ~300-350 ft.lbs.)

aidandj

iTrader: (5)

What are you running for a trans?

bcrx7

iTrader: (5)

I currently have a RX-7 Turbo but most likely will switch is out for a dog-gear of some sort in the very near future as I know the turbo transmission will be on borrowed time pretty much right away!

Leafy

iTrader: (1)

Drop on shifts only really matters for drag racing. The issue when using it for road racing is that you're either too low in a gear or too high in a gear while in a corner.

patsmx5

iTrader: (16)

Do you happen to remember the name of that thread? I searched for it but didn't find it. I've seen it before, and I believe someone (Sav maybe?) posted charts with the RPM drops for each gear for the RX7 and 5 and 6 speed miata transmissions. I wanted to go through that thread again.

aidandj

iTrader: (5)

Gearbox options and experiences
<br />https://www.google.com/url?sa=t&sour...La1wvNJtMSqHZA

bcrx7

iTrader: (5)

You just shift then? But joking aside, the gearing is pretty standard compared to other 5 speeds. Sure if you have a 6 speed, then you have a close ratio. But I rather not drive a 6 speed on a road course, just too much shifting for my liking. Carry enough speed in the corner, then you won't be too low in a gear.

patsmx5

iTrader: (16)

Thank you sir!

Savington

iTrader: (31)

Wildly oversimplified. Carry too much speed and you can't use the low gear, which forces you into the next higher gear. On a box like the Rx7 TII box, that means you're way, way down in the RPM range.

patsmx5

iTrader: (16)

Just read through that thread, thanks again.


From poking around, I've found numbers thrown out of people racing cars with the TII transmission at 350whp reliably. Street cars with more.

I don't know crap about gearing as it applies to track use.

But I do have a question for anybody who has an opinion/experience: Is the RX7 TII transmision stronger than the Miata 6 speed? All other things aside, is it at least a stronger box? It seems that it is from my reading online.