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  #1  
Old 02-22-2006, 01:52 PM
mill$civic mill$civic is offline
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Default what does pre load mean? when racing

hey, when people race i sometimes here that people pre-load because the light turns grean...what does this mean??
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  #2  
Old 02-22-2006, 01:58 PM
Patrick Patrick is offline
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Default RE: what does pre load mean? when racing

preloading...for instance, my track car is an automatic trans with a 4000 stall convertor...meaning that as the engine RPM increases, the torque convertor wont actually turn the transmission until 4000rpm..this allows me to launch well into my peak RPM range...this is pre-loading...

it is basically bringint the RPMs up prior to launching...as opposed to launching from idle when the light turns green.
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Old 02-22-2006, 01:59 PM
C5SpoonEG C5SpoonEG is offline
 
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Default RE: what does pre load mean? when racing

or pre loading the clutch
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Old 02-22-2006, 02:00 PM
Kappa22 Kappa22 is offline
 
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Default RE: what does pre load mean? when racing

It simply means overtightening your springs/shocks to provide you with a stiffer suspension base, which reduces body pitch on launching. Preload is only temporary, however, and will wear off after a period of time.
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Old 02-22-2006, 02:49 PM
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Default RE: what does pre load mean? when racing

three varied responses within 2 minutes of the original question
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Old 02-22-2006, 08:44 PM
sacicons sacicons is offline
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Default RE: what does pre load mean? when racing

and all correct, though i get the feeling that C5 was closer to what was meant in the original question. pre-loading a clutch means you let the clutch out a little so that it is just starting to grip, then you use the handbrake to hold the car from moving. then when the lights drop, your flywheel/clutch/pressure plate are already contacting each other a little, so you dont shock the drivetrain/tires as much when you launch, and you drop the handbrake as you launch. it is a little easier on your drivetrain, and a lot better for getting you off the line without as much wheelspin.
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Old 02-23-2006, 01:49 AM
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Default RE: what does pre load mean? when racing

Interesting, I've never heard of being able to do this with anything other than an automatic RWD car. How I've seen it done is holding the brake and getting the engine going so the rear end squats down so the weight is already shifted back there when you take off.

It makes sence that it would help on FWD too, and it can't be that different than an auto to do it with a manual.
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Old 02-23-2006, 01:53 AM
Kappa22 Kappa22 is offline
 
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Default RE: what does pre load mean? when racing

The method C5 and sacs described is how you should start going if you happen to park or stop facing up a hill to prevent riding the clutch.
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Old 02-23-2006, 01:30 PM
mill$civic mill$civic is offline
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Default RE: what does pre load mean? when racing

ahhhh ic ic..i get what everyone means, and ^yes i no sometimes when im on a steep hill and theres a stop light, i need to let out my clutch just enoph so my car dosent stall and then after when i hit the gas its keeps me still instead of rolling back a bit
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Old 02-23-2006, 03:34 PM
Patrick Patrick is offline
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Default RE: what does pre load mean? when racing

i thought that we were talking about racing...?
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