Best RPMs to launch 4x4 Cosworth?
07-09-2011, 10:21 PM
#2
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on mu t3 at pod i launched at around 4500 revs,but now have LC an it is set to 4300 but all personal preference. my pall laurnches my car at ovet 5000 revs.
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11-09-2011, 03:55 PM
#9
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Does hard launches hurt box also? I've heard that they are the diffs who get the damage. 
I have damaged viscous coupling (won't do hard launches until I install my new VC), my car is like RWD. Might be best only to do couple hard launches to save transmission..
What 0-60 mph times you get? I'd like to see what times you got and with what spec. Mine is T3 1.3 @ bar estimated +300 bhp, what 0-60 times should I be expecting?
I have damaged viscous coupling (won't do hard launches until I install my new VC), my car is like RWD. Might be best only to do couple hard launches to save transmission..
What 0-60 mph times you get? I'd like to see what times you got and with what spec. Mine is T3 1.3 @ bar estimated +300 bhp, what 0-60 times should I be expecting?
11-09-2011, 04:20 PM
#10
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Does hard launches hurt box also? I've heard that they are the diffs who get the damage.
I have damaged viscous coupling (won't do hard launches until I install my new VC), my car is like RWD. Might be best only to do couple hard launches to save transmission..
What 0-60 mph times you get? I'd like to see what times you got and with what spec. Mine is T3 1.3 @ bar estimated +300 bhp, what 0-60 times should I be expecting?
I have damaged viscous coupling (won't do hard launches until I install my new VC), my car is like RWD. Might be best only to do couple hard launches to save transmission..
What 0-60 mph times you get? I'd like to see what times you got and with what spec. Mine is T3 1.3 @ bar estimated +300 bhp, what 0-60 times should I be expecting?
i put a post up about1/4 mile times and spec, no 1 mentioned 0-60 sorry
11-09-2011, 05:47 PM
#11
ideally you need a little bit of wheelspin not a lot.
enough that you can hear the tyres but not enough to make smoke
this is the limit of traction
but it really depends on how your engine bahaves throughout the powerband
eg, if the best of your power is between 4 and 6000rpm you need to launch with more than 4000 so when the clutch drags the engine down you still have good power output. but if you rev it too much into the launch too much inertia is delivered from the flywheel into the clutch and the wheels will almost instantly lose traction.
some people can launch using second gear feeding the clutch in fairly quickly but you need a lot of torque in the mid revs and a clutch to handle it. you break traction initially but you save time with no gear change. straight up to 60 in one hit
enough that you can hear the tyres but not enough to make smoke
this is the limit of traction
but it really depends on how your engine bahaves throughout the powerband
eg, if the best of your power is between 4 and 6000rpm you need to launch with more than 4000 so when the clutch drags the engine down you still have good power output. but if you rev it too much into the launch too much inertia is delivered from the flywheel into the clutch and the wheels will almost instantly lose traction.
some people can launch using second gear feeding the clutch in fairly quickly but you need a lot of torque in the mid revs and a clutch to handle it. you break traction initially but you save time with no gear change. straight up to 60 in one hit
12-09-2011, 01:16 AM
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12-09-2011, 01:27 AM
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ideally you need a little bit of wheelspin not a lot.
enough that you can hear the tyres but not enough to make smoke
this is the limit of traction
but it really depends on how your engine bahaves throughout the powerband
eg, if the best of your power is between 4 and 6000rpm you need to launch with more than 4000 so when the clutch drags the engine down you still have good power output. but if you rev it too much into the launch too much inertia is delivered from the flywheel into the clutch and the wheels will almost instantly lose traction.
some people can launch using second gear feeding the clutch in fairly quickly but you need a lot of torque in the mid revs and a clutch to handle it. you break traction initially but you save time with no gear change. straight up to 60 in one hit
enough that you can hear the tyres but not enough to make smoke
this is the limit of traction
but it really depends on how your engine bahaves throughout the powerband
eg, if the best of your power is between 4 and 6000rpm you need to launch with more than 4000 so when the clutch drags the engine down you still have good power output. but if you rev it too much into the launch too much inertia is delivered from the flywheel into the clutch and the wheels will almost instantly lose traction.
some people can launch using second gear feeding the clutch in fairly quickly but you need a lot of torque in the mid revs and a clutch to handle it. you break traction initially but you save time with no gear change. straight up to 60 in one hit
12-09-2011, 07:10 PM
#16
Zee Germans are coming
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