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The VE table has more cells than the MAF table, so it's more tolerant of bad injector data. It is possible that you have a bad MAF sensor, but it's more likely that you have bad injector data....

Only happens on hot restarts after a 10 min sit time.... I'm guessing your IAT sensor is getting heat-soaked and that's causing you to run lean on restart. The 15 seconds is how long it takes for the...

Neither of them are brilliant, but if I had to choose between them... I'd choose the later model settings.

Ah heck, it's christmas... PM me if you want me to dial that in for you.

It was just GM giving the vette a 'unique' tune. They also changed the multipliers so it all comes out roughly the same in the end.

Try controlling your launching torque with some spark reduction... leave the throttle blade wide open.

I'm in sunny Queensland.

I was talking about remote tuners... those who send tune updates in emails. They can be anywhere in the world and tune your engine. I'm in Australia and I tune engines all around the world.

You...

A lot of tuners (including some of the so called 'reputable' ones) will just take your money and send you a canned tune. Try to find a tuner who will actually take the time to tune your engine...

Fueling shouldn't move around that much with a MAF... I'd say that your injector data is wrong.

I fixed his injector data and he's got a good MAF curve... no bumps or dips or ripples, just a nice smooth curve. I would not have been able to achieve that if there were any physical issues, so in...

That's why I told you to tune the MAF first... so you've got a decent MAF only tune to drive around on when you get sick of beating up your VE table.

I'm guessing his old software was stuck in imperial and he had trouble converting the injector data which is supplied in metric.

I've seen that happen in a Gen3... so it's not just an E38 thing.

I don't know much about direct injection, but like you said... it must be safe if it comes tuned from the factory that way, so if messing with the PE causes more KR then leave the factory setting.

Just because you have stock injector data does not make that data correct. I've seen situations where GM has used different injector data between two different models, which share the same injector...

Your injector data is wrong. You'll never get a well tuned MAF with bad injector data.. it just doesn't happen. SD can tolerate bad injector data, which is why your SD tune performs better than your...

The open loop EQ ratio is not set at 1 on the tune you posted.

You need to be in open loop when tuning with a wideband. You also need to set your open loop commanded fueling to 1.0 and don't log the MAF if you don't have one.

I do all my tuning on a spreadsheet.

You've put the pressures the wrong way around... should be square root of (58/43.5) * tested flow.

Your spark is a bit funky in that part of the log... makes me think it's something to do with torque management.

Crank angle sensor

If you intend on driving the vehicle in closed loop, then tune with the narrowbands. If intend on driving the vehicle in open loop, then tune with the wideband.

The answer to your question is in your logs. Look at your wideband readings and see how much they deviate from stoich. A particular cell on your maf table might have an average lambda of 1 after...

With bad injector data, you have to de-calibrate your MAF curve to get reasonable part throttle trims but this means your PE fueling is wrong... with your tune, you've ended up lean at WOT. You can...