How strong is a 12a box ???

[shaunwil]

As the question says what is the limit for the series3 1st gen gearbox. Investigating the engine project and maybe the low power rx8 engine may be on the cards :wiggle :wiggle :wiggle

Cheers

Shaun

[Dominic]

Why not use the rx8 box? :mmmm

[mpk490p]

Why not use the rx8 box? :mmmm

its got to be easier dont think the 12a would last plus most have done at least 50k
Mark

[mpk490p]

Why not use the rx8 box? :mmmm

its got to be easier dont think the 12a would last plus most have done high millage now
Mark

[shaunwil]

Well i have 3 boxs now and im not actually sure how hard a rx8 box is to pickup on the cheap !

Shaun

[oldone]

!st Gen box equals 3 laps x 4.12 km..:2eek ,1st Gen box equals one ROTORSTOCK and so on heheheheheh.I have used two in 2000 miles !!!!!! normal street driving...:evillaugh :cool   A lil more than stock power you have to upgrade,IMO.:Typing

[shaunwil]

Reading up on rx7club it\'ll probably be a 13b egi on a carb if i go that way and then i\'ll have to run with a better box.

Just wish i had the funds to copy carl and go 20b !!! lol

Shaun

[Timrxmotors]

With about 350 rwhp, a perfect egi box did 7  1/4 mile runs,then went the same way as the previous 3 did.The teeth strip off of the input gear,or off 3rd gear while under load.I believe the box is no stronger than the 1st gen boxes.
Bought the rx8 box I now use on E-bay,£400.Definitely the best way to go.

[kiwimazda]

I have used and abused by gearbox all season. Did one oil change midway through and no teeth or bits fell out. Its going back in next week with new oil again. However, it will probably destroy its self at the next event. But I have 2 spares. When they are gone I will simply go RX8 or a ford unit with quaiffe or tran x internals. But bear in mind mine is put through a bit more punishment

[shaunwil]

Does the rx8 box actually bolt up to the 12a or 13b engine ? Theres definately lots of options

Shaun

[rotary emotions]

All Mazda rotary boxes bolt up to all engines, just need to take a look at flywheel diameter, but if you use a lightwheight it doesn\'t matter anyway: just use the flywheel that suits the box.
But RX-8 engines aren\'t that strong; HP is less destructive on driveline parts than torque, and they do\'t have that much torque, do they? I\'m also not so sure about RX-8 boxes. As far as I know (haven\'t tested myself) TII boxes are stronger than FD\'s (weak synchro\'s on 3rd and 5th) and I wonder what\'s the RX-8 box is like.
It seems the best bet would be a TII box, it\'ll be cheaper than a RX8 and strong enough.

[rotary emotions]

BTW: EGI boxes aren\'t much stronger than first gens at all. Esp S3 (84-85) are about the same strength as EGI ones.

[drutin]

howzit

first generation boxes are strong if you can get a 12A turbo gearbox they even stronger, 12A turbo boxes have been used behind many a series 4/5 13B turbo engines in a first generation car with thrashing and i mean thrashing and about 200-300 hp they will last about 6 months
just start to wine abit, after burnouts and flat changing gears

a series 4/5 13b 6-port gearbox is similar if not the same as a 12A turbo box, stronger than series 1/2/3 non turbo box

you can tell a turbo gearbox as they have a snorkel type thing on the righthandside of the bell housing as normally aspirated dont, just the same vent/snorkel as on the series 4/5 turbo box

so if you can pick up series 4/5 6-port (non turbo)gearboxes cheap and dont mind changing them after awhile it would be the cheapest option

btw over fill the gearbox through the gearstick hole by about 1/2 to 1 litre of oil

hope helps
later
glen

if you need pics of difference between turbo and non turbo gearboxes let me know and will get some pics up

[shaunwil]

Cheers, i think im sticking with the 12a for a while. Just looking at my options at the min. with my rebuild project being scrapped im looking at the lpg option for the time being !

Shaun

[mpk490p]

howzit

first generation boxes are strong if you can get a 12A turbo gearbox they even stronger, 12A turbo boxes have been used behind many a series 4/5 13B turbo engines in a first generation car with thrashing and i mean thrashing and about 200-300 hp they will last about 6 months
just start to wine abit, after burnouts and flat changing gears

a series 4/5 13b 6-port gearbox is similar if not the same as a 12A turbo box, stronger than series 1/2/3 non turbo box

you can tell a turbo gearbox as they have a snorkel type thing on the righthandside of the bell housing as normally aspirated dont, just the same vent/snorkel as on the series 4/5 turbo box

so if you can pick up series 4/5 6-port (non turbo)gearboxes cheap and dont mind changing them after awhile it would be the cheapest option

btw over fill the gearbox through the gearstick hole by about 1/2 to 1 litre of oil

hope helps
later
glen

if you need pics of difference between turbo and non turbo gearboxes let me know and will get some pics up

my gearbox can be a little stiff untill it warms up, will overfilling it help with this or is it just for protection?
thanks
Mark