[s-cars] VMAP question

[Kirby Smith]

Working on memory here, but I recall hooking the A'pexi up to the
throttle signal as well as other signals.  I need to do an experiment to
be sure, but I don't think it tries to achieve maximum boost at 30%
throttle.  I don't think driving in that state would be tolerable.  Of
course, 30% throttle would restrict the boost anyway, I suspect.

kirby
 

FvAMI at aol.com wrote:
> 
> In a message dated 1/21/04 10:43:39 AM Pacific Standard Time,
> pizzoman at yahoo.com writes:
> 
> > Now whether you use a Bosch 3.0 bar, stock 2.5 bar, GM
> > 3.0 bar or VMAP is up to you, but it looks like the
> > VMAP is the more expensive option and once set up
> > properly with the right chips for your application, I
> > don't see the need to keep fiddling with transducer
> > settings.
> >
> 
> 1) The VMAP-D-3 is less expensive than the Bosch 211 even at the suggested
> retail price. So all the added benefits are free.
> 2) The GM sensor is external ... by the time it is all setup the integration
> cost will probably be the same as a VMAP. Without any added benefits.
> 
> Since the ultimate quest appears to achieve maximum horsepower - why detune
> your chips for the 90% time you run on 91 Octane.
> 
> External boost controllers don't modulate the boost based on throttle
> position or do the higher end units have that now? Some can be set for gear and rpm
> ...or do they also have programming for throttle position ... the snappy
> response most likely comes from the fact that they are constantly trying to achieve
> their set target boost which is independent of throttle position ... correct
> me if I am wrong I haven't looked at them for a couple of years.
> 
> The Motronics (first order) standard boost profile setup is related to
> throttle position and rpm. So at 33% throttle it's target boost may be only 0.5 bar
> boost and 1.3 bar boost at 100% (arbitrary example) ... your external boost
> controller may be setup to achieve 1.3 bar boost and it will attempt to reach
> that value weather it is 33% throttle or 100%.
> 
> Best regards,
> Feico van der Laan
> 
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