[s-cars] Question About Chip Options

[FvAMI at aol.com]

In a message dated 11/22/03 12:35:36 PM Pacific Standard Time, 
kirby.a.smith at verizon.net writes:


> To avoid this rumored problem when I had a Hoppen Stage 1 chip installed
> in my ECU, I added a boost controller (A'pexi AVC-R) programmed to match
> the chip's maximum pressure (1.3 kg/cm^2) in the higher gears, and the
> OEM pressure (1.1 kg/cm^2) in 1st gear.  However, I also don't try
> maximum torque turns in 1st gear.  If I tracked the car, however, and
> found a slow corner, I'm sure eagerness might overcome sense.
> 
> There are plusses and minuses with a boost controller.  Besides the
> advantage above, I also get a great peak and instantaneous boost gauge,
> or various other functions that can be displayed against one another. 
> Also, the boost is "snappier" due to the way the wastegate is used.  
> 
> Disadvantages include: One of the several ways the ECU can limit boost
> if it detects a problem is bypassed, boost programming subtleties that
> the chip author might have wanted are bypassed, and the A'pexi readout
> is green-blue, not red.  I am at sea level and use Sunoco 94 gasoline to
> provide a large margin against detonation.  If I lived in the mountains
> of CA, detonation would be a real concern, so it would have to be
> listened for.  Detonation is not so obvious in a water cooled engine, as
> it was in my air-cooled 1966 turbo Corvair.
> 

The VMAP-D has an option that can support Boost limiting in first gear (well 
any specified gear(s)). It is still going through the standard 6 month QA 
cycle we put new designs through. It may be released if there is enough interest. 
It is an option board that plugs into VMAP-D sensor. 

1) Advantage - uses all the ECU fail-safe + all the others the VMAP-D 
provides.
2) Disadvantage - May run slightly rich under wide open throttle during boost 
limiting and currently may only provide provisions to limit at 1.1 bar.

If there is an interest let me know. The production runs need to be a certain 
size to make it cost effective ... donating great solutions with a lot of R&D 
and $ bills wrapped around them would not be ideal.

<A HREF="www.moreboost.com">www.moreboost.com</A>

Best regards,
Feico van der Laan