Let's talk about lightweight clutch/Flywheel combo's
11-22-2015, 04:44 PM
#84
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11-22-2015, 05:13 PM
#85
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Heat will always be more of an issue on smaller diameter clutches.
But as long as it isnt a retard driving it, there shouldnt be an issue.
If you arent capable of driving a car onto a trailer without excessively slipping the clutch, either take driving lessons, get a different trailer or use a winch.
But as long as it isnt a retard driving it, there shouldnt be an issue.
If you arent capable of driving a car onto a trailer without excessively slipping the clutch, either take driving lessons, get a different trailer or use a winch.
11-23-2015, 12:22 PM
#87
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Changing gear isnt complicated or difficult. Like really...WTF do you think is involved changing gear ?
Foot on clutch, change gear, foot off clutch. There isnt any need to complicate such a simple task.
Foot on clutch, change gear, foot off clutch. There isnt any need to complicate such a simple task.
11-23-2015, 01:58 PM
#89
The lightest clutch assy's generally won't have enough thermal capacity to slip for very long at WOT, so they are not going to be a good choice if quick 60's are your goal. With a properly slipped clutch of sufficient capacity, you’ll get your best launch while putting no more stress on your drivetrain than if you were roll racing.
11-23-2015, 02:27 PM
#90
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The lightest clutch assy's generally won't have enough thermal capacity to slip for very long at WOT, so they are not going to be a good choice if quick 60's are your goal. With a properly slipped clutch of sufficient capacity, you’ll get your best launch while putting no more stress on your drivetrain than if you were roll racing.
11-23-2015, 02:50 PM
#91
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Why wouldn't proper throttle management with the appropriate wheel/tire combo be sufficient for great 60' times with the clutch not slipping? Even if you had street tires I would rather spin them rather than the clutch, but that's if you had no throttle management skills at all. That's why a lot of guys leave just off idle with street tires, no?
Because the reality is the huge difference between engine rpm vs wheel rpm at launch, and rpm needed to maintain a hard launch vs blowing teh tyres off....that slip has got to happen somewhere.
If the tyres slip, generally you're losing traction and hence forward motion. If the clutch slips you are putting huge amounts of heat into the clutch reducing its lifespan.
Somewhere in the middle is a balance, but there will be slippage somewhere for optimal launches.
That's why autos are so easy to launch, they've slip in the drivetrain pretty much built in, which allows the tyres to retain more traction.
11-23-2015, 03:11 PM
#92
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The lightest clutch assy's generally won't have enough thermal capacity to slip for very long at WOT, so they are not going to be a good choice if quick 60's are your goal. With a properly slipped clutch of sufficient capacity, you’ll get your best launch while putting no more stress on your drivetrain than if you were roll racing.
Iron has a higher specific heat than Aluminum, but aluminum will also radiate heat faster. And what about Carbon? Carbon is lighter than any of them, but it doesn't melt until 6400*C, at which point it will sublime (direct phase change solid to gas) typically rather than melt. If you're seeing that kind of temp in your clutch, you'll burn your car down, negating the need to worry about the clutch, right?
Long way to ask, but is weight and diameter the only consideration, or does material selection figure into this?
11-23-2015, 03:21 PM
#93
Why wouldn't proper throttle management with the appropriate wheel/tire combo be sufficient for great 60' times with the clutch not slipping? Even if you had street tires I would rather spin them rather than the clutch, but that's if you had no throttle management skills at all. That's why a lot of guys leave just off idle with street tires, no?
11-23-2015, 03:36 PM
#94
Define thermal capacity please.
Iron has a higher specific heat than Aluminum, but aluminum will also radiate heat faster. And what about Carbon? Carbon is lighter than any of them, but it doesn't melt until 6400*C, at which point it will sublime (direct phase change solid to gas) typically rather than melt. If you're seeing that kind of temp in your clutch, you'll burn your car down, negating the need to worry about the clutch, right?
Long way to ask, but is weight and diameter the only consideration, or does material selection figure into this?
Iron has a higher specific heat than Aluminum, but aluminum will also radiate heat faster. And what about Carbon? Carbon is lighter than any of them, but it doesn't melt until 6400*C, at which point it will sublime (direct phase change solid to gas) typically rather than melt. If you're seeing that kind of temp in your clutch, you'll burn your car down, negating the need to worry about the clutch, right?
Long way to ask, but is weight and diameter the only consideration, or does material selection figure into this?
11-23-2015, 05:45 PM
#96
9 Second Club
Nothing against a "lighter" setup, depends what the heavy setup was in the first place and how light you are referring to.
I personally would never go to a clutch as small as 7.25 if it was on a very heavy vehicle.
Which is the other aspect....if it is a heavy vehicle with tallish gearing as almost all LS cars are, that virtually wipes out any potential benefits from a light setup because in the grand scheme of things it makes **** all positive difference.
I personally would never go to a clutch as small as 7.25 if it was on a very heavy vehicle.
Which is the other aspect....if it is a heavy vehicle with tallish gearing as almost all LS cars are, that virtually wipes out any potential benefits from a light setup because in the grand scheme of things it makes **** all positive difference.
11-23-2015, 05:52 PM
#97
Less MOI is better, as long as temp stays under control. Quick times at the dragstrip are going to require a lot of slip, so the lightest clutch/flywheel package likely won't be the best choice if that's your focus.
11-24-2015, 04:56 PM
#98
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I made 16 or 18 passes last time at the track. I hot lapped the **** out of the car. Heat is not a issue......and I've had no issues loading in on the trailer when used.
If you burn up a clutch loading the car on a trailer you're a idiot.....just that simple.
If you burn up a clutch loading the car on a trailer you're a idiot.....just that simple.
11-24-2015, 05:19 PM
#100
If you are 10.9 @ 129, i doubt that clutch is slipping enough for a good 60'.