[urq] Engine Warmup Operation

[Bill Bennett]

 it doesn't matter how wide open it is or it is closed, the mixture will be 
the same, umm NO the mixture will not be the same, remember the shape of the 
cis "cone" the mixture will change with RPM when using the Continuous 
Insufficient System. period, we made no changes to our waste gate and saw 
boost  pressures change from 12 psi to 17 psi, the only change was no more 
CIS,  not having to suck up a plate, no comparision in spool up time, we get 
boost in 1st with 4:11 diffs, never did before. CIS sucks wind, spend your 
money wisely, get rid of CIS
----- Original Message ----- 
From: "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>
To: <urq at audifans.com>
Sent: Tuesday, January 31, 2006 9:10 AM
Subject: RE: [urq] Engine Warmup Operation


... all the air that passes through the Aux Air Regulator is metered ... it 
doesn't matter how wide open it is or it is closed, the mixture will be the 
same ... the only thing that changes is the amount of air that is allowed to 
flow into the engine, and thus the idle speed.  The only thing deliberately 
affecting the mixture outside the fuel distributor (and its associated bits) 
is the cold start valve on the intake manifold.

Steve B
San José, CA (SUA)
>
> Over the balmy weekend I removed the aux air valve to check the cold
> vs hot positions of the internal sliding valve. Seems that after cooling
> down the valve in the freezer to simulate a cold start air flow was
> restricted and probably resulted in a very rich mixture. Adjusted the 
> pivot
> pin to allow more air flow & reinstalled back on the engine. Next morning
> the car idled nicely @ ~1000 RPM and seemed to behave OK on light loads.

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