Tuning question for 730 ECM

[timsiford at hushmail.com]

Blade,

That is the Mandatory Torque converter lockup point. No matter what ... 
the ECM commands TC lockup at that MPH. If you plot your Vehicle Speed you'll 
notice that the speed still increases even though your RPMs drop.

The newest TC calibration file has a setting in the ECM Constants section 
called "TCC Unlock Prevention Speed Threshhold". That should be the mph 
that you see your RPMs dropping. Only problem is ... even if you bump up 
this setting it doesn't seem to work  I verified that TC is using the correct 
BIN addresses. They are 100% correct ... but, I think that I am still seeing 
lock. Modify this parameter to a higher mph ... like 115mph. Burn a new 
chip and then try again. Let me know if it works for you.

Tim


At Fri, 13 Oct 2000 11:39:41 -0700, "Edmond" <euro at lvcm.com> wrote:

>
>
>Hey guys. In my first attempt to modify a bin file with tunercat, I'm 
>=
>trying to eliminate the flat spot I see at close to 4000 RPM on the 
>=
>tach. What happens is when I get close to 4000 RPM in third gear at 
>WOT =
>the RPMs drop a few hundred RPM then they start creeping back up. Could 
>=
>it be going lean or not have enough spark ? My Diacom doesnt show =
>ANYTHING unusual at that spot except of course the RPM drop and a slight 
>=
>leaning out like a drop of about 50 mv... What do you guys think I =
>should play with in the bin ? Thanx =20
>------------------
>92 Z28 L98 350
>---------------
>Ported and polished heads, ported stock TPI base, ported plenum, Comp 
>=
>Cams XR270HR-10 cam (lift .495/.502 duration 218/224 lobe separation 
>=
>110), Edelbrock TES headers, LT4 valve springs, Crane AFPR, Flowmaster 
>=
>catback with LT1 style tips, MSD coil & wires...=20
>
>
>