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Old 09-03-2004, 04:42 PM   #1
culmination
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Default pardon my stupidity but what is..

utec's launch control what is it? what does it do? also what is "flat foot shifting??"

thanks~
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Old 09-03-2004, 05:01 PM   #2
RemlapaN
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flat foot shifting - shifting without letting your foot off the gas... (basically, hold the gas pedal to the floor throughout the entire 1/4 mile, even between gears.)

Launch control allows you to build boost while getting ready to take off. basically, it limits the RPM of the engine to a specified setting, and builds boost at that rpm. So, if you set it to 6000rpm, you could hold the gas to the floor, and the engine wont exceed 6000rpm, then you drop the clutch and take off. This is also critical for flat foot shifting so that you dont overrev the motor between gears.
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Old 09-03-2004, 05:08 PM   #3
culmination
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wow that is awesome~ i bet that can significantly help 1/4mile runs!
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Old 09-03-2004, 05:09 PM   #4
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Overrev + float = nice paperweight
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Old 09-03-2004, 05:33 PM   #5
culmination
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wait.. one more question... then will i be limited to only 6k rpm inbetween shifts?? isn't shifting near redline ideal?
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Old 09-03-2004, 05:37 PM   #6
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If you don't know what these terms are, probably not best to try them
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Old 09-03-2004, 05:53 PM   #7
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I think that's why he's asking
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Old 09-03-2004, 05:57 PM   #8
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Well, 1 more WRX tranny to be griped about, I suppose.
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Old 09-03-2004, 05:58 PM   #9
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Launch control is extremely stressful on your transmission and it usually isn't recommended unless you're running a much beefier setup in the tranny/gear department.
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Old 09-03-2004, 06:01 PM   #10
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so pretty much its not a good idea unless u got a better tranny
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Old 09-03-2004, 07:44 PM   #11
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Quote:
Originally Posted by nohopekid
so pretty much its not a good idea unless u got a better tranny
Beefed up trannies tend to cost a lot, too. If I had a $25k tranny, I probably wouldn't be launching on it anyway.
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Old 09-05-2004, 02:07 AM   #12
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If I had a $25k tranny I'd be launching the snot out of it.
I'll just have to settle for beating the piss out of my $25k car.

Pete
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Old 09-05-2004, 02:31 AM   #13
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Assuming the launch control let you set the RPMs where you wanted I don't see why this would put more much stress on the tranny. Say on a manual "launch" you rev the engine at 4500 RPM then slip the clutch and take off. Then using UTEC's launch control you set it at 4500 RPM, slip the clutch and off you go. I don't see how a launch controller alone would make things worse. It seems as long as he is slipping the clutch and not dropping it he will be putting stress on the clutch and not the tranny. Granted, the only knowledge I have of UTEC's device is from this post so please correct me if I am wrong.
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Old 09-07-2004, 01:35 AM   #14
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You're making boost with the launch control engaged. You have more power if you have 10psi @4500rpm (w/launch control) and less power with 0psi @4500rpm (without launch control). More power makes for a more stressfull launch.
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Old 09-07-2004, 02:42 AM   #15
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Quote:
Originally Posted by eastcoastbumps
You're making boost with the launch control engaged. You have more power if you have 10psi @4500rpm (w/launch control) and less power with 0psi @4500rpm (without launch control). More power makes for a more stressfull launch.
so what you're saying is that a turbo only makes boost under load? if that is what you're saying, how does that work?
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Old 09-07-2004, 12:44 PM   #16
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you understand how a rev limiter works yes?
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Old 09-07-2004, 01:02 PM   #17
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Also to make boost the throttle must be open, w/o launch control you only need a little throttle opening to rev to 4500, with launch control you cna leave the foot on the floor...... opening the throttle all the way!
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Old 09-07-2004, 01:15 PM   #18
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Quote:
Originally Posted by culmination
wait.. one more question... then will i be limited to only 6k rpm inbetween shifts?? isn't shifting near redline ideal?
Not all the time. The WRX makes its max torque at 6500RPM (If I'm not mistaken). Pushing it past that RPM is pointless. Personally, I find the shifter goes into gear easier at that RPM then at redline.
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Old 09-07-2004, 01:18 PM   #19
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In the UTEC manual, it says that launch control will mess up your cats also.
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Old 09-07-2004, 01:25 PM   #20
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using ignition cut will pass unburnt fuel through your exhauast system, this is will kill your cats. your valve train also does not care for this too much.

launching the car at full torque is what will dammage your motor/tranny/whatnot.
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Old 09-07-2004, 01:27 PM   #21
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Quote:
Originally Posted by trustWRX
Not all the time. The WRX makes its max torque at 6500RPM (If I'm not mistaken). Pushing it past that RPM is pointless. Personally, I find the shifter goes into gear easier at that RPM then at redline.

Torque peak is at 4000rpm. IMO Redline shifting will yield faster times than any other shifting.
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