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      03-18-2013, 04:50 PM   #7063
crypticc
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Drives: e92 M3 DCT + Comp
Join Date: Dec 2011
Location: London, UK

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Quote:
Originally Posted by TT3 iN NyC View Post
Ordered Cobb n54 AP today. Can't wait to receive it. Making the switch from procede.

What's the difference between linear and stock throttle?

I'm FBO (dp, fmic, cai, cbe) but no meth. Safe to run stage 2 aggressive?
Two ways to look at it is easiest.

Linear
1) single throttle position. Rpm engine speed increasing or decreasing.

Load requested stays constant even as revs rise. Will feel as constant acceleration as revs rise (excluding frictional and aerodynamics and .5 m v square effects)

2) throttle position increased or decreased for a given rpm.

Load requested change matches change in throttle in linear fashion for all speeds. Wool probably feel like your foot is more connected to throttle valves (know they don't exist)

Stock
1) single throttle position. Rpm speed increasing or decreasing

Load requested high at low rpm, tails off as rpm raises.

Gives impression of immediate boost to almost obtain a requested rpm.
torque then tails off as requested rpm reached. More throttle needed to maintain load as speed rises.

2) throttle position increasing or decreasing for a given rpm.

Load requested slow to respond initially, peaks rapidly, then flattens out again.

Feels that low request artificially surpressed to aid smooth driving. mid throttle is boosted, last throttle position fine tunes somewhere around maximum.



Flame suit on.

Lol
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