VelocitàPaola wrote:
sillycon wrote:
SD is a way of guessing air density.
Well, I wouldn't call it guessing...
It IS a guess (albeit an educated one) as it is NOT a direct measurement; only an inferred one.
By measuring the pressure and temperature you're making an educated assumption about the volume of air flow; issue there is that as the VE of the motor changes it has impacts on that measurement and the accuracy thereof, ditto with humidity, etc.
MAF/MAS setups directly measure the volume of air in a flowing system so it's not nearly as impacted by changes in VE, humidity, altitude, or other factors.
So far as ease of tuning, MAF/MAS is leaps and bounds better as you (generally) don't have to be constantly retuning. The MAF/T throws a monkey wrench in that statement, but that's due to the design characteristics of the GM-MAF used with it and the fact that it wasn't really intended for super accurate [or repeatable] readings in ultra-high-airflow situations.
The DS-Map project looks interesting, but it's no where near as complete or well rounded as DSMLink. You're also going to need to spend $175 on an Ostrich, and given the greater ability to fuck stuff up (and the additional considerations like no space left in the EProm to store CEL codes) it's really not that ideal of a solution.
At least $250 for an "in-development" tuning system where you explicitly loose the ability to see fault codes etc. etc., or $550 for a fully integrated, tested into the 8's, super fault tolerant EMS which enhances existing functionality without giving up any functionality.
Pudhed is a good guy; he and I worked on the DSM-ECU project together for a while. I'm guessing DS-Map is the latest version of his bin editor from a few years a go (he and I were both writing our own DSM EProm BIN/HEX editors back in the day). I have no doubt that his product works, but I can also promise you that there are far better "bang for the buck" options out there [like dsmlink].
All that aside, given the financial situation for most DSMers, it is absolutely in your best interest to go straight for DSMLink and skip the fussing around with experimental stuff. I promise you in the end it will cost you FAR more than you could ever have expected to go the cheaper route.
Pretty much every single member of this group has learned that lesson the hard way. Luckily for our newer members (such as yourself) you need not make the same expensive mistakes the rest of us did; you can simply inquire and benefit from our experiences.