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cjperformance · 09-17-2021, 09:47 AM

Testing my understanding...

For starting with a new speed density tune from STOCK values (they were NOT adjusted in the VVE tables by the canned tune), in order to start with a rich tune... I'm thinking I need to add something like 60% fuel in the higher PR/RPM cells to account for a best/worst boost of 8 psi at higher PR/RPM (down and right on the table)... but only like 12% to 15% in the lower PR/RPM range, and interpolated between the low and high PR/RPM due to the linear boost rate of the procharger?

In other words, the canned tune nerfs the MAP and VVE in favor of a MAF only, so the VVE tables are still basically stock n/a values.

Procharger has linear boost from 0 at low rpm to 7-8.5-ish psi at high rpm.

I'll have a baro breakout and 3 bar MAP by the time I do this, so I'll have good PR. So map should read 14.65 + 8.5 psi = 23.15 psi at full boost (or kpa/bar equivalent). Increase in air = proportional increase in fuel right? So 23.15 / 14.65 = 1.58 or 58% increase in air at the top end... highest PR and highest RPM.... so highest expected PR + RPM should be + 60% or so fuel... and that would scale down to something like +12% safety margin or as you travel either down the table (lower PR) and/or to the left on the table (lower RPM)?

If anyone has a good VVE table for a similar application, that would be great to see to validate what I might need to do.

09-17-2021, 09:47 AM	#60
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 950	Testing my understanding... For starting with a new speed density tune from STOCK values (they were NOT adjusted in the VVE tables by the canned tune), in order to start with a rich tune... I'm thinking I need to add something like 60% fuel in the higher PR/RPM cells to account for a best/worst boost of 8 psi at higher PR/RPM (down and right on the table)... but only like 12% to 15% in the lower PR/RPM range, and interpolated between the low and high PR/RPM due to the linear boost rate of the procharger? In other words, the canned tune nerfs the MAP and VVE in favor of a MAF only, so the VVE tables are still basically stock n/a values. Procharger has linear boost from 0 at low rpm to 7-8.5-ish psi at high rpm. I'll have a baro breakout and 3 bar MAP by the time I do this, so I'll have good PR. So map should read 14.65 + 8.5 psi = 23.15 psi at full boost (or kpa/bar equivalent). Increase in air = proportional increase in fuel right? So 23.15 / 14.65 = 1.58 or 58% increase in air at the top end... highest PR and highest RPM.... so highest expected PR + RPM should be + 60% or so fuel... and that would scale down to something like +12% safety margin or as you travel either down the table (lower PR) and/or to the left on the table (lower RPM)? If anyone has a good VVE table for a similar application, that would be great to see to validate what I might need to do.