[Diy_efi] Running headers with factory GM TBI

[Jeff Behrens]

Does anybody know if I can parallel the two O2 sensor
readings from my headers into one and feed it to the
factory computer?  I am working on a 1991 Z71 trying
to go back to the factory TBI with headers now.


Jeff
--- Shannen at grolen.com wrote:
> It's not a bad idea to pick something in the
> 40-60kPa  MAP range
> (cruise) and run above and below typical road
> speeds, then work up to
> 90-100kPa MAP range to give a good set of reference
> points.  As you
> watch for activity from the knock sensor, remember
> that long periods
> under high load can tend to trigger knock which
> might never show up on
> the street.  There aren't too many places on  the
> street one can run at
> WOT for 25 minutes with an LT5.
> 
> I would also tend to use fixed rpm increments and
> use the throttle to
> move through the MAP points above.  If you have a
> good datalog
> capability and a way to correlate exhaust readings
> with MAP, you can
> quickly pass through many points, shut the car down,
> and make
> corrections to many points on the table.  Keep an
> eye on PE mode entry
> and exit points so as not to incorrectly adjust VE
> tables for what may
> seem to be an excessive rich condition, and don't
> forget to check for
> knock indications.
> 
> Shannen
> 
> 
> 
> DI>All,
> DI>I will be fine tuning my fuel & spark maps on a
> Dynapack dyno in a few
> DI>weeks.  This is an eddy-current type dyno, not an
> inertial like Dynojet.  My
> DI>objective will be to optimize for best torque.
> 
> DI>For those that have tuned maps this way, any
> tips?  I have a 17x30 Fuel Map
> DI>and a 16x23 spark map (1228331 ECM, BFXB code,
> 1991 Corvette ZR-1).  I have
> DI>two hours booked, so I don't think I will get to
> optimize each data point.
> DI>I guess I will pick a few at each RPM band, and
> interpolate the rest later.
> 
> DI>Using the Romulator and WBO2, I've got the
> part-throttle at 14.7:1 already,
> DI>but want to see what makes best torque at those
> loads.  Suppose I just start
> DI>increasing the VE (and spark advance) until best
> torque?
> 
> DI>Appreciate any guidance, especially if you've
> used a Dynapack before.
> 
> DI>Regards,
> DI>Todd Pepmeier
> 
> 
> 
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