[s-cars] Re: Living at altitude - Apexi and turbos

[QSHIPQ at aol.com]

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I'm puzzled kirby as to why one would use it at all at sealevel.  Is this to
address wastegate cracking?  IME with these controllers (I also own one on my
4Runner turbo - no wg control before), none of them "compliment" the factory
setup, they can't by definition.  If you are using the controller to ramp
faster than the stock/tweeked ecu, then there will be a point where the ecu
will give a different boost profile based on it's inputs vs the controller
(which only has a couple).  If that is the case, then you are making a dumb
device, the smarter one.  Oxymoron.  If you are using it to address WG
cracking, I'd suggest a closer look at the WG itself.

I'm not trying to start a war here.  Many folks use them.  I just advocate
that the best boost controllerin an S car is already in your car.  The WGFV
may be a shortcoming, but if everyone spent the same 500USD and threw it to
some enterprising software dude, I'd bet you could get a stepper motor
(better) into the software, which would preclude a lot of folks having to buy
multiple WGFV as well.  In the case of the Apexi, it's solenoid controlled,
which means you are trading backwards in computer function.

IME with the HKS EECIV, getting a "snappier" response is actually putting you
to the left of the surge line of the turbo.  It can operate there for a short
time, shorter than the aftermarket controller can/will react.

Scott Justusson


In a message dated 10/4/02 9:01:25 AM Central Daylight Time,
kirby.a.smith at verizon.net writes:


Notwithstandig Scott's vast experience with boost controller removals,
deserved and/or otherwise, I will repeat myself with these facts:  Given
that my A'pexi is operated at the same level of boost limit as the
Hoppen Stage 1 ECU chip with which it is operating, 1.3 kg/cm^2 (except
that in 1st gear I limit the boost to stock, 1.1 kg/cm^2), and given
that the Audi WGFV is left electrically connected to the ECU, but
pneumatically removed from the WG loop, and given that the A'pexi WGFV
returns air to the turbo inlet as the stock WGFV does, I pull no codes.
I get snappy response.  I hear no detonation (and as a Corvair owner,
I'm particularly sensitive to such noises).  I do use Sunoco 94 as a
safeguard, and I live near sea level.  Those running controllers without
high octane available, or operating at other altitudes, or using other
chips and turbos may be candidates for Dr. Scott's miracle elixer.

kirby