Newbie tuner trying to make a project work.

Hi guys, I am kinda new here and very fresh regarding to tune besides being a mechanic for 20+ years. I decided to mark around with some cars i have, so here is whats going on.

Engine 1.8l 16v (from holden)

360l/h in tank pump with return line

Pressure around 3.5bar

668cc deka injectors

Ls4.9 wide band

Master black ecu

Turbo intercooled

Oem motor (no big cams or any mods, just got a NA engine and put a turbo/intercooler and the stuff above)

Thing is, I cant get my afr right on track as well as the lambda vs target lambda. My target is somewhere around 0.94 idle, and it reads 1.23. Afr gauge shows 18.1...what am I doing wrong?

The fuel table has Map Sensor Load, but the Lambda Target table shows Map Sensor. How is Map Sensor Load calculated? Your cursor shows it's using a value less than 20 kPA, but the MAP sensor is reading 36 kPA.

The fuel table should be a lot smoother, you don't expect to see big peaks or valleys anywhere. In general more load always requires more fuel, and table will have a shape in the RPM direction that mimics the torque curve the engine hardware can produce.

The picture shows what I have been playing with. I am posting the picture of ve table the way it was before I started playing. The oxygen sensor was far away from the turbo, I thought it was my issue. So I brought it to the 90° angled downpipe. The reading did not change a bit. Within the map sensor, the ecu has the sensor in it, i am just running a hose from the intake to the ecu directly.

If I turn the ignition on, lambda shows 1.01, after 10 seconds roughly, bang, it goes to 1.13 sometimes to 1.21....afr gauge around 17 to 18, pretty strange.

Then I started playing with everything to see if I could change the lambda, but nothing seems to work. The only thing I haven't been playing with is the ignition table, I just left it on the safest side possible.

Thanks for your reply anyway David.

When you say "If I turn the ignition on, lambda shows 1.01, after 10 seconds roughly, bang, it goes to 1.13 sometimes to 1.21.", is this without the engine running, or is it idling?

Does the lambda sensor only turn on with the ignition switch?

You may need to wait for the Lambda sensor to warm up, many ECU's have an option to wait 30 - 60 seconds before using the Wideband Lambda values.

BTW - that is a much better looking VE table. Did you determine how MAP Sensor Load is calculated, vs the MAP sensor value?

Hey David.

It does change when idling, not with the ig on only. But if go seat in the car now and turn the ignition on, it shows 1.01. Start the car, in a matter of a few seconds it goes high. We found a small leak in the intercooler, not big at all, very small leak. I am gonna fix that to rule that out.

Also, changing the ve table does not change the afr or the lambda values, what i believe it should. I am running 98 petrol in tank, I dont know if that info counts anymore. Also, took the spark plugs off, and they are black as hell, as rich mixture. Took it for a little drive around the block, when turbo pressure start to kick in, feels like no fuel enough besides injectors PW shows 7 to 8ms.

I am not sure about this relation between map and sensor load map. But it seems accurate when i accelerate. I have got a manual gauge connected straight to the turbine, when it shows 10psi map and map sensor matches in the ve table and in the tune screen. However, I'll dig a bit further into that relationship in between those two, and see if there's anything out of order.

Tks once again for helping, it really makes a difference sharing it with someone knowledgeable.