6 Port Auto Vs. 6 Port Manual
 

Ok so I just found out that the 06 Autos come with a 6 Port motor as I thought that all the Auto's had the 4 Port.

I looked up the specs for 04 and 06 and it says:

04 Auto- 197HP
04 Manual- 238HP
06 Auto- 212HP
06 Manual- 232HP

If someone has more accurate Data please let me know.

I got this info from:
http://www.carsdirect.com/research/s...61A0&year=2004
http://www.carsdirect.com/research/s...61B0&year=2006

I am looking for some clarity on these motors and what the differences are.

My wife has the 6 Port with the 6 Speed Auto
I have a Parts car 04 6 Port Manual
and I am selling an 04 4 Port 4 Speed Auto

I was trying to get info about swapping the manual motor into my wife's car when I find out it has almost the same motor.


What is restricted about her motor that it can not rev as high as the manual?
What can I do to make it more like the Manual Motor?
Why is it showing less HP for the 06 Manual Vs. the 04 Manual?

Also the specs said that the 6 Speed Auto had a 4.30 gear Ratio and all the rest had a 4.44. Would it be worth my while to swap out the rear end from the parts car? I plan on swapping the carbon Drive Shaft for the Steel Also.

Thanks for the input in advance.

the difference in horsepower is because automatic transmissions have more drivetrain loss AND the automatics dont rev as high, so top end power is lost.

the swap has been done. you need to swap out the PCM, guage cluster, and the tranny. more maybe.

i would swap the rear end too.

contact rotaryresurrection for more info. he did it successfully.

just sittin on 8s, arentcha?

6 port manual has always been 232 HP. In the early years it was advertised as being higher. Mazda had to buy some cars back because of the initial incorrect value - which was somewhere in the 240s.

AT can't rev higher because of limitations of the torque converter.

Ken

and we all know, that in reality, the 6 port manual is ~215hp.

the autos are even less.

What do you want to achieve ? That may help with what advice you get ...

To my knowledge, the 6P AT engine should be the same as the 6P MT engine, except that the rear iron has a hole in the side for the AT starter to bolt to. You can put an MT behind it without issue, the hole will remain open, but it is purely cosmetic and will not effect use.

The only gray area that I am not 100% sure of, is the eshaft and bearings/gears.

The 4P AT engine is supposed to have a shaft that is different from (and assumed inferior to) the 6P MT engine shaft, per part numbers. However upon examination I cannot find any visual difference in the 4P AT and 6P MT shafts. It is unclear what shaft the 6P AT engine would come with.

Furthermore the 4P AT has the non-window bearings and (supposedly slightly inferior) stat gears. The 6P MT has the window bearings. It is unclear what bearings/gears the 6P AT would come with.

I have not gotten any to tear down as of yet, to make comparisons.

Of course, the "inferior" versions of rx8 shaft/gears/bearings are still at least as good as the 86-91 rx7 parts, and those engines can live up around 9000rpm without major issues. So, worst case scenario if the 6P AT engine has those "inferior" parts in it, and you convert it to MT and rev it higher, it should still live with no problems.

With likely good reason...their RWD AT's have sucked major ass since the 2nd gen rx7. Think about it...929, MPV, rx7, all used basically the same transmission, and none of them were too reliably even in the modest power output they came stock with.

theres actually a pretty detailed thread about this it tells you what u need and what u need to change it even has pics just do a search n u should find it :)

heres a good thread started by RR sorry couldnt find the other one w pics https://www.rx8club.com/showthread.p...nvert+at+to+mt

So the motor is essentially the same it is just that because it is an Auto they limit if so it does not destroy the the transmission? In "Manual Mode" would it be Safe to rev it past 7,000 RPM at all or would this just put too much strain on the Trans?

Also would it be worth swapping the rear end since the ratio's are only a fraction off?
What was the reason behind having a different gear?

My 04 4P AT already had the 4.44 diff...at least as near as I can tell by counting the revolution of the input versus output. Of course there is very little difference between a 4.3 and a 4.4 ratio, so it could just be that I lack the skill to differentiate visually between the driveshaft turning 4.3 or 4.44 turns to turn the wheel one rotation.

Yes, the engine could tolerate being spun higher, even if the shaft/bearings/gears are not as good as the MT versions. The problem is that the stock PCM will not allow you to rev much past 7k...I recall hitting the limiter around 72-7300.

a cobb accessport will fix that issue

there are some AT owners that have already raised their redline

Yeah, but 700 bucks for 10hp (roughly the amount to be gained by revving another 1000rpm) does not seem like a good tradeoff to me.

yeah but thats not all you get to do with it.

you could pick up another 10hp with tuning.

I agree, but good thing it does alot more than that, as you know I'm sure ;)

I dont argue that it is a useful device. Just that the price of it (with tuning) is a bit high for the power you get in return, IMO. If it were 4 or 500 bucks then it would be far more accessible, it seems to me.

it is a better bang for the buck than most bolt on mods though, excluding FI
of course the tuning aspect is key

meh, the AP is an extremely good investment for NA vehicles regardless of any power gains.

I have a 04 6sp manual that has poor compression on the rear rotar.
I have found a 6port auto motor and was wondering if I can use it (can swap manifolds and all sensors for port function).

is there any further information to clarify that the 6port from an auto is internally the same as a 6port from a manual?

You'd have to rebuild the 6P MT motor, no? Why bother?

I can rebuild my 6port mt but it would cost >$2000 and I would be off the road until it is done (>1 week depending on what parts were necessary).

I have found a 6port auto for $2000 and could do the swap in under a week. makes heaps of sense to me unless the internals are inferior--that's why I'm interested in clarifying the internal differences.

Follow up
 

sorry to pull old thread. Did you do the swap successsfully?and what parts u swap ?

thanks
ray

I'm interested in knowing as well....hopefully someone will answer. I found a 6 port auto already out the car for under $100 that "just needs seals" (yeah ok lol) . I have an 04 manual with a recently rebuilt motor , but thought Id pick up the 6 port auto for that price and just take my time rebuilding it. Nothing wrong with having an extra motor lying in wait. I just need to know that it'll work and that it won't be a lot of extra work or downgrading my car at all.
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