What is powershifting....how do you do it.... and is it bad for the tranny?

thanx

Powershifting is when you shift the car without lifting off the gas [Wide open throttle].

Its great for going fast... very good for breaking trannys.

Theres not much you can do thats harder on a tranny.

~v6

O yea, and if you cant shift well. Dont even bother trying cause your bound to break something.

If you miss a powershift the damage can be catastrophic.

~v6

jkocher191's tranny "Please, do not power shift!"

Unless you have one hooked up car running 8's in the 1/4.

Also, no need to double clutch.

/\rcanum

Everything above it true. Also, it is almost impossible to powershift with just a short shfter lever. You need a complete short shifter linkage assy to be able to do that.

- Alex

Powershifting a WRX can give you huge gains...

But like alex said its next to impossible sometimes. If you spin thru first gear 9 times out of 10 you will miss second if you try to powershift.

its not worth it in the grand scheme of things.

~v6

yeah dont shift under to much power often, i just blew my tranny doin that! so dont do it ok!

guys don't tell him what power shifting is :lol: J/K

But for real don't power shift your all wheel drive vehicle for nothing its really not worth the abuse....I mean unless you got an extra few grand laying around.

Oh, and your ? is answered above...

~B

An AWD car is not a good thing to be powershifting in unless you have a race transmission that can take the abuse. Dropping the clutch when there's 4 wheels of resistance and the weight of the driveshaft to bring up to engine speed is a nasty impulse to deal with. The bad concequences of missing a shift with a WRX are exponentially worse than they would be in any 2WD car. If you have a really light flywheel, its a different story (allows/requires higher rpms for same impulse prior to dropping clutch) but then that has performance issues that concern launches and drag racing, so its not a solution to your problem. I didn't risk powershifting in my RX-7 until I had installed a torque brace to keep the drivetrain from jerking back during shifts. I've got a shortshifter kit in there too and it helps a lot with preserving your confidence in hitting 3rd gear without worrying. Eitherway, RX-7's are 2WD and the ability they have to break the rears loose easily acts as a BOV for too much power during powershifting. The drivetrain in a WRX would be like having a racing BOV with a spring that's too tight for your boost settings. So in relation to compressor surge, the drivetrain will take the abuse for every time you do it. So don't. If you want driving pointers, then work on your clutching. There are some gains you can make with the right left footwork during upshifts at WOT. This will burn your clutch out a lot faster and shouldn't be done if you don't have the hardware to handle it. I'd say, don't try anything but normal shifting when racing. The advantage you make up with an AWD setup lies within the car's ability to be floored much sooner in the launch. Wheelspin sucks and its avoided to a large degree by driving a WRX.

Trany will go......

[QUOTE]Originally posted by Arcanum
[B]jkocher191's tranny "Please, do not power shift!"

Unless you have one hooked up car running 8's in the 1/4.

Also, no need to double clutch.

What is double clutching??? "I live my life at a quarter mile at a time..."

[QUOTE]Originally posted by jkocher191
[B]What is powershifting....how do you do it.... and is it bad for the tranny?
----------------------
Get a computer and powershift all you want. It will hold your rpm's from excedding the desired rpm.

how much do trannys cost??

What is double-clutching?

The reason I ask this is that during the last autocross I went to (my first) I discovered that the WRX does not like to go back into 1st. I was whining about driving in 2nd at low RPM's and the lack of pick-up when I was advised that, "if all else fails you can double-clutch." Not wanting to look like an idiot I just said, "Right!" nodded my head and walked off.

So what is double-clutching?

Originally posted by EtchyLives
What is double-clutching?

The reason I ask this is that during the last autocross I went to (my first) I discovered that the WRX does not like to go back into 1st. I was whining about driving in 2nd at low RPM's and the lack of pick-up when I was advised that, "if all else fails you can double-clutch." Not wanting to look like an idiot I just said, "Right!" nodded my head and walked off.

So what is double-clutching?

no real need to double clutch with syncros...you could just rev-match....
double clutching: car is in 1st gear when you need to shift to 2nd clutch in to neutral. clutch out. rev to proper rpms. clutch in shift to second.

rev-matching: on syncro cars you dont need to put the clutch in to take car out of gear but...to rev match if down shifting...
run in 3rd until down shift is required. clutch in while you are shifting to 2nd give throttle to proper rpms (where the rpms would be at if going that speed in 2nd) while rpms are still up shift into 2nd clutch out.....no shudder and more power in torque curve

Originally posted by berkasal
how much do trannys cost??

Directly proportional to how good you want it. Speed costs money. How fast to do want to go?

Educational and informative, no?

Oh yeah. When I got my RS, I decided that since it was the foundation for a rally car, I could basically treat it like one. I routinely would either powershift (or if I was feeling lucky, punk, I'd synchro-shift at redline or thereabouts). The car actually responded well to it, but I'm sure that I'll be very lucky to get to 50k (at 30k now, with those antics 15k behind me) without any problems. I'm actually about to start a new thread, because I'm curious about the potential medicinal effects of a lightened flywheel on said gearbox.

Originally posted by BAN SUVS
Directly proportional to how good you want it. Speed costs money. How fast to do want to go?

Educational and informative, no?



just a stock one or sothing a little better than stock?

Yeah, I also have another question...Whats the deal with the fact that I can shift without the clutch going up the gears. For instance, I can be in 2nd and be slowly going up the powerband, and shift at 4000rpm and how I can do it is apply a slight amout of pressure to the shift lever pushing forwards, then as I sharply take my foot off of the gas, the lever will slide out of 2nd. As my rpms are then falling (becasue i had taken my foot off of the gas and am now in neutral) I push the lever into third gear, but don't push the clutch. As my rpms fall, the lever magically slides into gear, no grinding, no bad noises, but the lever just catches and slips in as I apply a little bit of pressure into the area where thrird gear is. What is this? Why is it happeneing? and is it bad? Thanks. (hope someone responds before Iblow up my tranny)

~Joe

Originally posted by FatJoe
Yeah, I also have another question...Whats the deal with the fact that I can shift without the clutch going up the gears. For instance, I can be in 2nd and be slowly going up the powerband, and shift at 4000rpm and how I can do it is apply a slight amout of pressure to the shift lever pushing forwards, then as I sharply take my foot off of the gas, the lever will slide out of 2nd. As my rpms are then falling (becasue i had taken my foot off of the gas and am now in neutral) I push the lever into third gear, but don't push the clutch. As my rpms fall, the lever magically slides into gear, no grinding, no bad noises, but the lever just catches and slips in as I apply a little bit of pressure into the area where thrird gear is. What is this? Why is it happeneing? and is it bad? Thanks. (hope someone responds before Iblow up my tranny)

~Joe

No, believe it or not, it is the BEST way to shift. When you are upshifting so smooth you can't feel any jerking at all, there aren't any harsh forces smashing your tranny parts together. The 'magic' is what you already said- the falling revs as you upshift allow the synchros to come together at almost the same speed, which means that they are able to do their job in almost an instant, which is much faster than you can actually shift. The reverse of this is why you can't hardly downshift into 1st- the revs for 20 mph in first are WAY higher than the revs for 20 mph in second, so you have to rev way up to do it- but you won't usually get it right, which is what makes the car lurch or buck so hard when you do it. Anyways, keep up the good work. as long as you are (relatively) gentle with the clutch, you are well on your way to a long, hapy life together with your tranny.

Originally posted by berkasal
just a stock one or sothing a little better than stock?

Ummmm... I don't know. For a used gearbox call RCSR in Rancho Cordova or go to their website, http://www.4subarusuzukikiaparts.com/ and ask.