g'day, if i cant get a manual 3rd gen, ill have to get an auto.. i have herd that when properly done the boxes can be better than the manual

so whats involved in working an auto box?

what is a shift kit and how does it work?

how much would it be to have an auto box that would keep up with the manual?

cheers, sheriff

well you could get ya auto ratio's changed so to suit how u drive and im guessing u ned good acceleration for saturday nites :P

yeh, i could gte the ratios changed but then fuel economy on long drives would be ass...(well if that was if i was to suit it to how i drive :badgrin: )

I would like to think you would find a manual if you are really after one... I know the thread is about auto's but don't write that chance off.

I do very much wish mine was a manual... I know it would have so much more potential.. but I will be subscribing to this thread to see what responses come back as I am interested too about what can be, and has been done to an auto box.

Saying all what I have about wanting a manual... I wouldn't mind showing people what a 3.0 auto can achieve without spending the earth...

Anyway... it's not about me. Good luck with your searching :D

...bbooooooooyyyyaaaa..... where are you..... i know you were talking about autobox something arather...... wats the goss and whats the cost to do an auto box?

anyone got any more info on this?

I was actually thinking about this the other day. What if we raised our ratio to that of a manual and then got a short shift kit. It'd basically be the same. But then again i dont know how easy it is to change gear ratios, i was thinking about it but i have no idea on how or cost or anything. If it's simply and electronic value than yeh, it'd be easy, but arn't gear ratio's determined by the size of the actual gear? so you'd have to replace the gears which sounds hard and expensive. But any info on this would be terrific. Also if we kept the same 4th gear ratio (i dunno how doable that is) fuel economy would be the same highway driving, would just get alittle worse short driving if you over revved.

there is nothing wrong with a 4speed auto ratios.

this is how you would work an auto box (in order of)

a) increase engine power by means of high compression/turbo motor
b) take your gearbox to this place in adelaide >> www.ppgearbox.com
c) tell them to make straight cut gears
d) install a shift kit.

=

one hell of an auto box that would wind your car beyond the horizon!
a) = increasing the hp of your engine - well, speaks for its self - you dont build an auto if you have a stock engine.
b) = just take it there
c) = straight cut gears will be BRUTAL on gearchages, so maybe get the factory helical gears strengthened to like a PPG Helical-cut (wont be as harsh, will allow some mega power to be transfered through your auto)
d) = shift kit to make use of your new strong as nails gearbox.

i belive by increasing the pressure on the auto oil line or somthing like this, you can get your desired shift "pressure" (ie hard or soft) - this would be tied into the shift kit anyway.

the good thing about the auto ratio's is that you would only need to shift "two" gears to get well and truely around 120km/hour - where as a manual, you'd be either doing 10,000rpm in 2nd or you've already slammed it into 3rd. = this in its self saves time, cuts the 0-100 dash time and i bet a nice auto will outshift any manual driver :cool:

the comments on manuals have more control - yes and no... but during a drag the only thing you wanna control is the fact you want to be infront. - ill take two heavly worked autos thanks :cool:

Thanks heaps Ben, some great information there, thanks for sharing. :D

*appends it to his wish list!*

To "work" a gearbox you will need to upgrade the valve body and clutch packs. the valve body controls the bands and how fast they engage. im sure you could then get a full manualized valve body made up if you were to take it to a transmission shop. that would be mad. gears really cant be changed in an auto because they arnt as you would expect them to look like. the bands would also need upgrading because of the extra force on them. not even a month ago i finnished semi assembling a mates VL auto box with a B&M shifter, fully manualised valve body, kevlar bands and upgraded clutch packs. by semi i mean i put it all together and took it to a propper mechanic to double check everything. for him it cost around about $1600 with a 3,500rpm stall converter. Auto's are stronger than manuals, by far, and with a full manualised kit then your gear changes are as quick as you yourself can change from 1 to 2.. without a hardcore shifter this would be slightly slower as all you do with the B&M shifter is slap the stick up like a tippy, with a std shifter u have to slide it into 2nd from 1st making sure not to go too far.

his car warrents a hardcore auto tho.. its a RB30et with massive mods and will run 12's

a hardcore auto in a magna would be a site tho :D

How much does this kinda stuff cost to do.

anyone get any quotes or any guesses as to how much a worked auto would cost.

As i have a feeling my auto is gonna go to heaven in the near future.

Tom

I am from the states and we have a quiet a few options when it comes to building a performance tranny. I am planning to mod my tranny too with a higher stall converter. That alone will help you launch the car like a manual. Of course you don't want too high of a stall speed because then you'd have to upgrade the clutches and bends. For firmer shifts you'd need a valve body recalibration. In order to do this you'd have to send you valve body to them so they can calibrate it (or levelten calls it Hydosystem Service) or upgrade it.

There was a guy selling torque converters for $320 US. He has moved to South Africa since then but is still selling them through somebody else. There was a topic about this on diamante forum, just do a search on thier and you'll turn up something. Type "rezlo" as a keyword. That should make it easier. His converters are less then half the price of the sites mentioned below but use the same quality material. Most of you probably won't order from this guy cause of shipping charges but at least you'd know whats out there.

www.levelten.com.

And another is, http://www.importperformancetrans.com/mitsubishiauto.shtml

might end up sub 1200 then. the valve body can be installed with the gearbag in the car but the clutches cant.

can you just put a shift kit on an auto box without doing any of this other stuff to improve shifts? As i dont wanna spend a hell of a lot of money but would like to rev it out more when some idiot thinks he can beat me at the lights.

thanks
jaz

shiftkits wont shift your power curve. the auto changes when it thinks best, it uses diferential equations and a hell of a lot of physics.

shiftkits will make changes more firm (faster activating servos)

full manualised valve bodys (faster again and externaly controled) will hold it in 2nd at idle if you want. then the stally will engage like if you were trying to take of in 2nd with a manual.

upgraded bands will not begin to slip with the extra force and wont wear out

upgraded clutch packs will also engage harder into gears

stall converters change the rpm when the engine engages the driveline. std they are like 1800 or something like that. and because they are low they still roll the car forward a little because they are on the brink of gripping at idle. a 3500 stall converter will need to be reved to say 2500 before that small amount of rolling is achieved

I think the stock stall speed 1450, on a Nissan it might a little bit higher like you said 1800. If I were to upgrade it i'd upgrade it to 2400.