Boost Controller Feature

[rtune]

HKS evc VI and i am sure others allows boost maps to vary boost

according to RPM & throttle position (a grid).

Is there any utility to this?

eg if a turbo pair can hold 1.0 bar from 3000k to 8000k,

can it do 1.5 bar from 3000k to 5000k ? (after all, 1.0 is half the

amount of air being pumped vs 1.0 bar at redline, so there

is headroom, and presumably at 4000k the stress to the engine

of 1.5 is not nearly as much as it would be at the upper end).

could u set a boost profile that was @ X psi flat with

throttle position 90% or less, but 50% higher than X till 5000k,

only if throttle was floored?

I was reading the HKS EVC manual and the feature is explained but

the drawback/utility/risks were not explained.

edit: as it happens, the evo ecu flash guys are very excited about

discovering rpm vs throttle boost maps in their stock ecu ..

http://forums.evolutionm.net/showthread.ph...0353&page=9

It seems to be over boosting in the mid range with full throttle..

Edited November 27, 2008 by r34nur

[rtune]

Nobody uses rpm/throttle vs boost maps? it is just a dumb marketing feature?