I know little about SBCs and carbs. If I ever did such a swap it would be an LSx EFI engine swap. with at least 450hp/450tq. I'd be much more likely to do a 13b-rew FD swap, though.

Well, that just shows my ignorance. I assumed all of the modern pushrod chevy V8s were "smallblocks". But that seems to only apply to one series.

Anyway- sorry to tangent your thread.

On topic.

Doesn't the auto RX8 have smaller brakes?
Any suspension differences?

The base model 04-05 At had the smaller brakes. The Sport model has the larger brake setup like the 6Mt 8.

Also the Sport model (any year) AT has the better suspension the 6MT starts with.

yeah, mine was one of the "sport" auto versions with bigger brakes and 18" wheels. The shitty auto models had those little 16" wheels and such.

Hey- I just learned something on an internet forum. Is that even allowed? lol.

I really didn't know the auto RX8 could be had with the same hardware as the 6 speed manual. I figured it was like the V6 and V8 Mustangs... though that's not even a good example since I think you can order a V6 Mustang with all the V8 hardware other than the engine.

I actually like the 16" wheels... but not on the RX8. Maybe on a Mazda3i sedan...

And just a guess here- but I bet you premix (*even with the metering pump still there*). What are you using, and why?

(crap- another tangent. Just refer me to a premix thread if you have already answered that)

so ballpark estimate how much did the whole swap thing cost

It not a bad idea to read the other posts in a thread you also post in :spank:

Check out post #14.

"i told you so" lol.

More than you can afford, pal....









MANUAL

https://www.premiere.com/var/ezflow_...ff_quote_x.jpg

lol - nice

Hi,
I have read this post from start to finish and this question is original....(i think)

Is the A/T engine bare block (or short motor) identical to the M/T bare block (or short motor)
as in DSCF1539.jpg

http://www.rotaryresurrection.com/kl...p/DSCF1539.JPG

For the US market, the 04-05 automatics were 4 port, which is totally different from the 04-08 manual 6 port. The 06-08 automatics were 6 port, but the rear iron was different from the manual 6 port, to accomodate the wierd automatic starter that bolts on from the side. So there are actually 3 different engines for USDM 04-08 cars...early auto 4 port, late auto 6 port, and manual 6 port.

Did u use the motor mounts from the auto or did u have to buy transmission specific

Visually I could tell no difference between auto and manual, but I used the lowest mile set I had anyway which happened to be the manual set. I am not convinced there is any actual difference between them.

Fantastic thread.

I have one simple question. You said that the drive shafts are dimensionally and mechanically identical. Would the carbon fiber drive shaft fit into a 4port A/T ? Do you think there is any conceivable performance gain from doing so?

I have not test fit them both on an auto so I cannot say for sure, but I can think of no reason it wouldn't swap.

It'd kinda be like putting running shoes on a fat man and expecting him to be faster, though.

Wouldn't the reduced weight improve power delivery? Just a thought :)

Sorry one more question; how hard is to do this drive-train swap? I plan on having it done at a workshop if possible and I'd like to know how long it would take, what all will have to be opened up.

Thanks again

The auto trans eats up most of the power...but yes you might gain an extra coupe of hp at the rear wheels on a good day.

well this question is sorta on topic
but since the 5 speed jdm 8 used a 4 port engine about how much work would be needed to swap that in?

not something i'd do but i've been curious about it for a while

since I havent seen that trans, I have no idea. I would imagine the same amount of work.

doesn't even seem worth the trouble...

hey guys ok so i did the conversion it works beautifully i just cant get the car started on the manual pcm i get it started on the auto ecm no problem it drives perfect but i just brought car to mazda today they programmed my keys to the manual pcm and it was cranking but not turning over any ideas? plz i wanna be able to drive the car properly