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Old 08-05-2003, 03:09 AM   #8
Concillian
Scooby Guru
 
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:
2002 WRX Sedan
Midnight Black

Default

MAP is confusing. Basically you just want to check it against your boost gauge so that they are in agreement for the most part.

Mostly just a sanity check.

You've probably already done this mentally, as long as the two are close and in agreement, you are set.

As for exactly how to do it, the instructions are a good explanation, just do everything exactly as outlined in them. Take everything literally. Basically you are getting two points on a line, and then translating them into values that the car will understand (MAP digital values)

Sometimes I find it easier to go by MAP digital anyway. I know my boost gauge is off by ~+1 psi at about 15psi because shiv showed me this when I had my Unichip tuned. For me, I care more about matching the level I had on my MBC than what boost I actually have. I know that boost level is going to be close to ideal. Rather than fiddle with getting just the right gauge pressure, I can go straight to digital MAP, since I logged what I had before I changed my MBC for the bleeder.
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