Silver_Surfer

Looks like a whole lot of fricton/heat in an auto trans.

longpath

iTrader: (1)

Is there, in the aftermarket, a torque convertor that can stand 10K RPM (to give a safety margin over the rev limit of the 6MT), such that the rev limit on the 6AT could be raised to match that of the 6MT without turning the torque convertor into an anti-personnel mine?

alz0rz

iTrader: (41)

No but you can get one custom built.

http://www.levelten.com/index.html

One or two here have done it.

Nopstnz8

iTrader: (6)

Does anyone know if there are any dual clutch transmission swaps available for the 4AT yet, similar to BMW's SMG, which would fit in directly without tons of fabrication and interior reconstructing? It would be a great option compared to a torque converter.

em1turbo

do the 4 port AT 2004 rx8s have a different engine than the manuals? are they really that slow? with a small yet damaging neutral drop from 3k rpm i hit about 7 seconds in my 0-60. breaklaunch i get in the 9s. and normal you will get 11.

09Factor

Not yet. Our greatest challenge is the disabling of the TCM. So far the AP is not config'd to mask the error codes that the TCM throws if the Transmission is not present. Same issue will happen if the TCM is removed, the PCM will not be happy and not allow the car to function right.

All of the manuals are 6 ports and have the ability to cluth dump at any given rpm.
We auto's that have 4 ports have a higher drive train loss because of the TQ fluid coupling. A low torque vheicle mated to a "high" loss drivetrain will give high trap times.

Easy_E1

iTrader: (2)

The Accessport is capable of raising the redline. But it will do nothig for the speed limiter. Shut down at 125 mph. At least the 05's.
I know there is someone on this forum that has no limiter on their 04 AT. They have been to 153 mph

longpath

iTrader: (1)

My understanding is that the 4 port AT engine is basically the same as the Euro 4 port MT engine (which has a 5 speed transmission instead of the 6 speed that the 6 port engine). The port timing is completely different from the 4 port to the 6 port engines. On the bright side, the peak torque is higher on 4 port engines, which could be advantageous in a turbocharged, centrifugal supercharged, or axial-flow supercharged setup where those compressor types need some revs to start moving air in any significant way.

The 6 port engines have a lower peak torque but a broader power band and continue to make power well past the rev limit of the 4 port engines.

cjkim

people need to stop quoting this
you're talking "official" numbers of 164ft/lb(auto) vs 159ft/lb(manual).... hardly a difference

09Factor

Any idea who, or has the name been changed to protect the "innocent"?

I have seen more tq on a Fi'd auto (4port) running the same turbo at the same psi. but that is for another thread.

I'm with you on this one.

em1turbo

yea actually a 4 port auto with a turbo doesn't gain much hp. but the torque flies way up.

em1turbo

and I hit 132 with my 4 port auto.. actually 135. then limiter kicked in. Will never try again...

Atilla

iTrader: (1)

define "much"

40 to 50 extra whp is pretty big considering most bolt on's do crap...

09Factor

^^^ nice ***. Just had to say it.

back to topic. 5psi added 100 ft lbs of tq and bout 50 hp.

Atilla

iTrader: (1)

^you should've seen ALL the pic's

wow, 100lbs of torque!? mother fcker must snap at the line...

Tekne3k

I have a stock JDM 4 port and it shifts at 8300 all the time

ferrocene

Just to be clear, as I understand it the fluid coupling only exists in the time between shifts (1 second usually, sometimes 2 seconds @ 8000k RPM ) and when you're not moving in Drive or Reverse.

The rest of the time, even while accelerating, the engine and wheels are locked together. The "slushbox" is only slushy between shifts. That is why there's a lockup clutch when the input and output shafts are moving at the same speeds.

Phil's 8

iTrader: (3)

Quote:
Originally Posted by Easy_E1
I know there is someone on this forum that has no limiter on their 04 AT. They have been to 153 mph

Any idea who, or has the name been changed to protect the "innocent"?

Innocent? Never thought of myself that way. Do not try an emulate this as the car becomes (is) airborne and the slightest breath of air will cause real problems.

laulongfei

Haha nice Phil,

truplayax14

I've gone 154mph @ 7000rpm with room to play, it wants to go faster. Although I have a 6spd auto... Any new updates?

RotaryP7

I call bs.

MarcMiller

iTrader: (1)

i have an 04 auto and im looking to make my car feel faster..i sometimes feel like it is slow than other times i feel it takes off pretty good.

eventually im trying to have intake,exhaust, and tune.

will these make any big difference?
doesnt have to be a big difference but will i notice it?

whats the fastest an 04 auto could go if i got the tune to remove my govern?

truplayax14

No bs, was going down I-95 at 3am. My friend and I were driving to top out his ss, I was trying to keep up.

Tem

I have a question about a 2010 a/t , how could you raise the rev limiter on the car , and till when would it be safe to raise it with the stock torque converter?

Also can you play with the timing of a rotary like you can with a reciprocal engine to advance the torque curve ?

and if so why the hell did mazda not do that from factory to the A/t or did they ?

JTtheDude

You can get a Cobb AccessPort from MazdaManiac to cut the rev limiter, I believe some people have reported sluggish shifting when over 9K though.

Rotary engines don't have timing belts but you can manage some things through the Cobb AP.

The intake and exhaust are about tuned to the max from the factory while still being emissions legal, and no turbo, there is just not a lot of power at low rpm's in a rotary engine.