1 Bar to 2 Bar Conversion for boost in LT1

[turabo87]

Hi fellow tuners,

Wanted to know what's the appropriate tables and areas to scale if changing the 1 bar MAP sensor to a 2 bar (from an Gen IV LSA ZL1 or CTSV), into a C7 LT1 application. It's gonna be an A&A kit. Kit didn't bring a 2 Bar MAP nor a baro breakout harness, but I'd really like to tune this C7 auto the most correct way possible for boost, to assist the torque calculations to be accurate and just to have everything kosher.

Also, how many of you are actually tuning boost on LT1s with a 2 bar and a breakout harness? Seems like a mixed bag out there. Heard some even do without the 2 Bar and leave the 1 bar, but sounds to me like a recipe for torque calculation disaster, even if it's a MAF tune.

CORRECTION: It was always a 3 bar sensor (PN 12592525) to be retrofitted, which is the LSA ZL1/CTSV pressurized MAP sensor. I incorrectly said 2 bar.

[Ben Charles]

I like to use 3 bar map. Just rescale VVE table and tune it!

Baro breakout has to be used to dial in pressure ratio correct otherwise when boost hit the sensor it skews the PR ratio

[turabo87]

I might be saying it wrong then, maybe it's a 3 bar. It's the LSA ZL1/CTSV Map sensor to be retrofitted.

So only rescaling VVE? No rescaling of the MAP itself anywhere?

[5FDP]

You just have to tell the computer what the new linear and offset settings are.

[Ben Charles]

312.50
-11.25

[turabo87]

and where would that be? I'm thinking of using linear and offset settings from an LSA ZL1 tune then.

[5FDP]

In the airflow tab.

[grcam6]

I like to use 3 bar map. Just rescale VVE table and tune it!

Baro breakout has to be used to dial in pressure ratio correct otherwise when boost hit the sensor it skews the PR ratio

Agree with him. I had a blower without the baro breakout, and the baro readings would go up to the limit of the baro sensor (17.7psi) when the true baro was in the 14s. Gives false numbers in other words.