LS7 card maf

[VX L67 Getrag]

I had a feeling I did actually manually guess the start point lower as I knew the GEN3 start point was lower, but then it threw a fault code of 32 so I thought I screwed up!
But maybe it was because I did it on the fly & the code didn't like that?

so does that mean for the excel sheet to work I need it to be -150% if that is what the difference is?

Thanks for your advice!

[yoda69]

If the mgc is lower than expected (vehicle lean) you need to increase the values to get it right.
Any change to the start point will have a significant change to the fuelling of the first table and progressively less on the later tables if you work it out as a percentage. I would work on getting the start point about right and then start working on the curve.

[VX L67 Getrag]

Cool, Thanks again... I think it would be a lot better doing it this way than just adjusting the inj rate to suit as all the tables that reference any air would be out by over 150%.

[VX L67 Getrag]

Just going back over my log with it & its logging;
MAF: Manifold Air Flow
Cylair 50-1650
But not showing anything for MAF Hz: Manifold Air Flow Frequency

So think its going to be a bit hard to tune if it's not getting that!

I logged & tuned a gen3 maf 5 minutes before it & logged everything fine, so can only assume it may be a faulty card maf?

[VX L67 Getrag]

Turns out when maf & harness was supplied the wires in harness weren't correct so switched wires & all good!

Now I can actually tune it correctly & base inj rate only needs 213.867 to 283.555 so it seems the mgc, Hz & g/s are out by similar amount so I'm thinking if I bring the start point 35% lower & the rest of the tables -35% with using excel sheet it should bring EVERYTHING back into correct range?

Glad I'm getting somewhere & thanks everyone for help & advice!

[VX L67 Getrag]

Looks like that made the excel sheet crash but only in the last table, I must be doing something wrong?

[antus]

It wouldnt call it correct without doing a dyno pull and correcting from the logs, but it would be a step in the right direction.

[VX L67 Getrag]

Yeah but what about the last line error & thus causing graph fall off at the end?

[antus]

The last row looks like an off-by-one in the spreadsheet. The "Maf table data correction factor" table in row X ends one row too short. Cell X39 is empty, and that sets off a chain of divide by zero errors. I copied 4.890 from X38 in to X39 then the table looks valid, but we'd need yoda to comment on what should be in that cell.

[antus]

Also, for a maf 15khz is really pushing it hard with huge airflow. so it cant be right that your larger maf is signalling 15khz for for 340 grams/sec of air versus 500grams/sec on stock.