| auto transmission mods - Click HERE for Original Thread |
| robyn402 |
before i get mercilessly flamed for this let just start out by saying i'd luv a manual in my car but it'll cost to much to trade in and what not... my only option is to privately sell the car for what i owe on it and its brand new lol... so i've decided that if i'm going to keep this car i'm gunna make it perform as good as possible
so any way does anyone know or know someone who can give me some ideas to make my car perform a bit better? i have CAI,CBE and an underdrive pulley so far... thinkin of gettin a header and downpipe right away to complete my engine mods for now.
so what the hell can i do to improve my car besides that? i've heard of high stall torque converters (not totally sure what they are and how they'd work for my situation) and ecu's and thats pretty much it.
i'm planning on a turbo or super charger in the future but what can i do until then for a little more get up and go now? since i suffer abit off the line on low end power |
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| kevito_ |
| If you're driving your automatic pretty hard, and you want to keep the car for a while, consiter an automatic transmission fluid cooling radiator to prolong it's life. |
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| jzz30tt |
There are a few things that you can do for an auto tranny. First and most well known is a shift kit. This will speed up the time the transmission takes to shift.
There is also (for launching the car) a stall converter that will allow you to stall the auto up to a higher rev by brakestanding or even just flashing in order to launch better, especially usefull if you're turbo'd and you want to get some boost off the launch.
Those are the mild things that can be done, you can get crazy with it as well but i don't know any local shops that i would be going for for built auto trannys. |
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| robyn402 |
| hmmm where would i get said parts? |
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| jzz30tt |
| You can probly just ask at a transmission shop but personally i make my own shift kit. The converter is definately something you might want to ask about at either a performance shop or a transmission shop. |
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| robyn402 |
right then any clue on what sumthin like those will cost... and what makes up the shift kit any way?
flashing? i was told brake stands are bad |
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| Z-Fighter |
| shift kit consists of splicing resistors into wires, which increases the hydraulic pressure used to shift, resulting in a faster shift. I don't know the details for your car; I'm sure you could find it in any Lancer forum. |
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| jzz30tt |
Shift kit is actually usuall mechanical not electrical but that's on the cars i know and could very well be electrical on others.
But the main point is correct you are playing with the fluid pressures in order to speed up the shift.
Brake stands are bad for the tranny but if a transmission oil cooler is added then the risk is mitigated somewhat.
Stalling the converter is how anyone dragging an auto normally launches. Some will simply flash instead of stalling it up but stalling will get you better rpm and consequently boost on a turbo'd car if you're anywhere near your spool RPM |
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| robyn402 |
| so i should definitly stop into a tranny shop in town for a chat.. any suggestions which? |
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| robyn402 |
flashing?
as well with the stall converter if there anything special you do when launching or does it just not drop power to the wheels until you hit a certain rpm? not completly clear on this yet :( just wanna find out as much as a ican because i do plan to turbo this car in the future
and does that always happens when you start off? will it matter if in "d" or low gear? |
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| jzz30tt |
There are two types of stall, flash stall which is if you hit the gas how high will the rev's 'flash' to before you feel the power hit the wheels. The other is by using the brake.
All sorts of people will argue all sorts of things about manually shifting an auto and what not, but it's mostly finding what works for you.
A stall is exactly what you said, a certain rpm that the engine will get to before the car really wants to put the power down. Higher RPM before it wants to take off = more torque and quicker launches.
I don't know of any specific shop that i would take it to around here but maybe somone else will know. |
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| Fazda |
| i've been thinking about getting a stall converter for my car as well. i hit full boost at 1900rpm :) im definetly gonna have to take a look into this. |
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| robyn402 |
| so how does it work..? does it always keep you car from launching till you hit so much rpm or is it a switch or setting that only happens in low gear or sumthin |
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| jzz30tt |
Nope it's just the way an auto tranny works. At any point don't brake stand but put one foot on the brake and slowly add a little gas. there will be a point where the wheels really want to go. That is a stalled up auto.
Fazda, how small are your turbos? To be spooling that low they'd have to be tiny. what is factory boost on the S4? |
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| robyn402 |
| uh huh... so doing this with the stall converter is just better for the car? |
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| jzz30tt |
| The reason for upping the stall converter is so that the car is more (or can be) more 'explosive' off the line. That's it. the shift kit is for speeding up shifts. Less time shifting = quicker car. |
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| Fazda |
| My turbos are small. they are k03's they spool up by 1850, and i have full 258tq at 1850rpm. its nice. The whole reason i want a standard is to be able to launch better but this stall converter just might be what i need. |
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| jzz30tt |
| WTF? I'm no S4 enthusiast but i'm sure you don't have your full torque at 1850. Full boost maybe but there's that little thing called your engine that makes the torque and that's not gonna peak till 4-6 k rpm. |
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| Fazda |
lol well then maybe u should become one.. maybe try googling some stats.. see what pops up.. actually wait.. ill do it for you.. oh here it is..
Oh shit it is 1850rpm.. damn.. i wonder how i knew that oh wait now i remember i drive one.. lol :dunno:
Audi's engineers are especially proud of the S4's flat powerband that boasts full torque at a low 1,850 rpm, an important attribute considering the typical lack of low end grunt associated with turbo engines.
http://www.edmunds.com/insideline/d...articleId=44342
who would of thought audi knows how to build an engine? |
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| jzz30tt |
Hey that's awesome. I didn't know it. I'm fine with that. That's a crazy torque curve. Sorry for the sarcastic remark but it seemed a bit odd.
What boost stock? And what are the stock twins capable of? Ball bearing? |
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| Fazda |
| lol sorry if i came off a little blunt there.. stock turbos are running 7-8psi. with the ecu upgrade aka Flash. either GIAC, or APR, most common will increase the boost safely to 20 psi. Which bumps the power at the crank 80hp 110tq. |
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| jzz30tt |
| those are some pretty flexible turbo's. Stll an insane spool rpm. In real life do you actually hit full boost at 1800 or a little higher? And do you know if they're BB? |
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| mikeylikesit |
with the shift kit your going to want a manual valve body, that way you can shift it yourself.. basically like a b&m quickshift.
and flash is re-tuning the computer to tell the transmission to shift faster or at different rpm's. by shifting faster its gonna put more of a stress on the drivetrain but less wear on the clutches due to them contacting faster instead of slowly rubbing to full contact.
the high stall torque convertor just lets you rev it up that much higher without it doing a burnout i believe.
and if you want to be driving your car hard you will definately need to get a nice big transmission cooler to mount upfront. dont want it to overheat.. that kills it pretty fast. |
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| jzz30tt |
| The flash i was refering to is like i said earlier, the rpm the engine will flash to before putting the power out. |
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