ALDL data

[udidwht]

Just want to get a better perspective of the fuel map...

Pulled these from my 454 TBI how do they look? Typed below the (low-high reading for each) This was while cruising down the highway. RV runs great and averages 8-9mpg on the flats at ~60mph. Getting ready to rebuild the TBI here as well. Also going to install an adapter on the fuel inlet (replace the OE one) and will install in it a fuel schrader valve to allow me to quickly connect a fuel pressure gauge if need be.

One thing I noticed is the MAT reading shows -40 but this engine has no IAT on it at all.

IAC position - 129.0

IAC desired - 129.0

Coolant - 215.0

Battery voltage- 13.4

TPS volts - 1.353 -

MAP - 59.8 - 60.907

O2 Sensor mVolts - low of 79.56 - high of 791.18 (mostly in the hundreds range)

Barometric - 97.069

Vehicle speed - 56.0mph

Fuel pump - 13.0 volts

Engine speed - 2650rpm

EGR duty - 72.XX - 74.XX

Seconds - 11147.0

Desired idle - 750rpm

TPS % - 20.784

Spark advance - 33.047 - 34.805

Knock count - 103.0

INT - 127.0

Rich/Lean - 3.0 - 73.0 (consecutive count)

BLM Cell - 10.0

BLM- 136.0

Knock retard - 0.0

BPW - 3.311 - 3.51 (ranged btwn)

Actual EGR - 40.0 - 41.961 (ranged btwn)

CCP Duty - 99.608

MAT F - -40.0

Channels 1, 2, 3, 4 (no Data)

[Eyez Open]

Your advance is great at 2650 rpm...I'm shocked GM got that aggressive.. actually for GM that is aggressive.

Your temp is quite high for my tastes, 170/185 tops under most conditions. Bear in mind that is my opinion only a few things about temperature. Readings taken near the exhaust port will run 8/10 higher than temps taken from the intake manifold.

[udidwht]

Your advance is great at 2650 rpm...I'm shocked GM got that aggressive.. actually for GM that is aggressive.

Your temp is quite high for my tastes, 170/185 tops under most conditions. Bear in mind that is my opinion only a few things about temperature. Readings taken near the exhaust port will run 8/10 higher than temps taken from the intake manifold.

These year TBI 90+(95) engines ran with 195F T stat. The CTS is just below the T stat on the front side of the intake manifold. As for the timing with the wire disconnect it's set at 4 BTDC. Once the wire is connected timing is 15 - 16 (mostly 16).

There are (3) temp sensors on the engine...

1. Left cylinder head (dash temp gauge)
2. Right cylinder head (auxiliary fan) engages the aux. fan at approximately 221F coolant temp
3. Intake manifold (frontside)

[Eyez Open]

Opinion here, the only temperature that counts for you is intake. There is almost 80hp up at 175 degrees.

I would highly recommend the below software cheap and quite powerful. If I remember right it will read your afr's.

 https://www.tunerpro.net/

[Eyez Open]

Opinion here, the only temperature that counts for you is intake. There is almost 80hp up at 175 degrees. As to your timing all that matters is your comp advance..and yes your base timing starts the party.

I would highly recommend the below software cheap and quite powerful. If I remember right it will read your afr's.

 https://www.tunerpro.net/

[udidwht]

Your advance is great at 2650 rpm...I'm shocked GM got that aggressive.. actually for GM that is aggressive.

Your temp is quite high for my tastes, 170/185 tops under most conditions. Bear in mind that is my opinion only a few things about temperature. Readings taken near the exhaust port will run 8/10 higher than temps taken from the intake manifold.

The aggressive advance is while at a 'part throttle' condition. Load = throttle position

One can get best MPGs with an AFR of 15-16 at part throttle but it requires added timing from the advance. No lean tuning with a centrifugal only distributor. The added advance combined with leaner condition (at part throttle) will also be cooler running.