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For me personally, lag is the time between flooring the pedal and it coming onto full boost.
Spool up is the time between the turbo starting to spin and getting to full speed.
No doubt everyone will have their own different ones!
Lag / Spool - The time taken from the application of WOT to the attainment of full turbo boost.
There is also the RPM after which the engine is capable of producing full boost. In the real world this varies for each gear and load condition, not sure on what to call this, sometimes it's referred to as the above terms, perhaps 'boost threshold' is a better term.
Cheers'en, AndyC
1994 ABY Coupe - Projekt Alpinweiss
interesting this repo. certainly a different topic starter, i like.
dest said it well but lag for me is either what dest said combined with the brain contemplating do i drop it to second or do i let that car pull a car or 2.
spool would be time between the time between the start of coming on boost to hitting the desired level. not very long really.
for example short shifting brings a spool time whereas dumping at 2k and waiting brings lag
Lag = From applying throttle ( typically WOT ) the time taken for noticeable acceleration of the car forward in relation to the production of turbo boost and gear used.
Spool = The time taken for a turbo to reach a desired boost level typically measured against engine RPM
Last edited by Jamo; 28 August 2009, 11:51.
Reason: spelling
Two of the same?
I would say its the time taken for the exhaust gases driving the turbine to come to a higher enough pressure to drive the turbine to overcome its rotational inerta and reach the speed necessary to supply +/boost. So the lag or the "spool" you wait for is the turbine to reach a effective velocity.
everyone who cares about lag really needs to know what is the earliest rpm the full boost is achieved. Terminology is for those who just want to sound important. Euphism if you may...
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