Merim,
In your post below, you mentioned Speed Density (SD) Engine Mgt. I was not familiar with SD so I did some reading on it. There are lots of opinions out there on SD vs MAF, but the consensus seems to be:
- You can squeeze out more peak power using SD. However, SD tunes are less adaptable to changes in barometric pressure, altitude, vacuum line leaks, etc. This may result in some driveability issues.
- MAF is more adaptable and can compensate to produce more consistence performance.
- GM tried SD on some select production models, but has gone back to MAF. Speculation is that there were more customer complaints with the everyday driveability of SD.
I think the conclusion is:
- SD is a good choice for track cars where peak performance is important, at the cost of more frequent dyno-tunes.
- MAF is a good choice for street cars where every day driveability is important, at the cost of a few peak HP.