VE fuel and AF table generators setup.

[Fueler]

Newbie alert on setting up a project.
After fumbling around through the varied help files and pdfs I need some clarification.
1: The AF and Fuel VE table generators are supposed to give me a reasonable starting point, correct?

Filling in the fields is not a problem except for the MAP (kPa).
Working with a street blown small block (relatively mild)
Using a couple of high end sim programs I have a decent idea of the boost psi at any rpm.
Here are my inputs.
Supercharged (fyi 671 roots, 7% underdriven)
355 cubic inches
idle: 1000
Predicted parameters:
Redline: 8500
Pk HP: 550 @ 8000 Boost: 5.1 psi
PK Tq: 472 @ 5000 Boost: 11.4 psi

2: MY question surrounds the kPa inputs. It was preset at 100.
Converting psi to kPa is easy enough but there is a couple of ways to look at it.

IF I should input a differential number relative to absolute zero they would be:
Pk HP: 11.4 psi = 78.6 kPa
Pk Tq; 5.1 psi = 36 kPa

IF I am to measure relative to vacuum and want to resolve the pressure relative to the atmosphere then the numbers become:
Pk HP: 11.4 psi = 179.9 kPa
Pk Tq: 5.1 psi = 136 kPa

3: Which is the correct way to look at this?
FWIW the higher numbers create a lot more green cells than the lower numbers.

4: I will have vacuum at idle: Exactly what number I don't know yet. Got a starting point suggestion?
Is that input as a negative number?

I did not include an msq because I am not that far along yet but can do so if needed.

Thanks so much for this forum.

[grom_e30]

100kpa is about atmo so boost will be above this so 200kpa roughly 14.5psi depending on your altitude. i normally see about 35kpa at idle on my inline 6 engine car but my bike inline 4 with itb's sees about 85kpa at idle.

[Fueler]

That makes sense. I knew my VE would be higher with boost so it follows that any MAP kPa number would be higher than 100 and any vacuum lower. At least I know which calc to use in the future.

thanks