a drawback of speed density is that it doesnt self compensate from what i understand. so if you change the set-up on your car, say put a bigger cam in, you will need to be tuned right away for the more air in the engine. now i understand that you should be tuned right away regardless if your on a MAF or SD, but on a MAF it will compensate as much as it can

plus since SD runs off of engine vaccum, adding a cam to SD for instance is really gonna mess up the previous SD tune in there. this is just one example.

i myself wouldnt call that a drawback because im one of those people that will get tuned right after my parts go on anyway

 

EvoJoeIX- I put those numbers down on VDR in about 90* heat and mild humidity but it was setup for dyno jet and uncorrected for the weather so I say its pretty close. I would agree your right on when talking about compensation with SD it doesn't "learn" as to say adding an intake on a MAF car, the car can make general small changes to make the car run better without a tune but on an SD car it will not know what you did and continue on its same fuel regiment. I think the driveability is ALOT better now and no jerky transition from closed loop to open loop fuel control when getting into boost.

 

oh yea, drivability is def better with speed density especially if your running a VTA blow off valve.

speed density is the way to go as long as you can tune it or have someone in your area that tunes it

 

seems like im goin sd really soon and thanks for your help everyone

 

Good to hear once you go SD you never go back!!

 

it improves driveability. although i hear things about a bucking problem from 2500-3k rpn, on every single person who runs sd. correct me if im wrong

 

that can be fixed

 

what do you mean bucking problem and how does it get fixed

 

I dont have that problem

 

its something you have to tweak in the ECU i beleive and the problem goes away. i honestly couldnt tell you exactly what it is

 

heres a question for those of you running speed density.... does your car run different in drastic temp changes? like summer and winter?

 

If no changes are made to the tune OR if you are not running a Temp sensor to compensate for the intake charge temp. I do not have a IAT sensor and I have to change the tune around to get things in order between summer and winter cause the Air (in north carolina) gets really dense in the winter.

 

yea im in Maryland. so we have 25 degree days in winter and 115 days in summer....

i believe the AWD kit comes with a IAT tho

 

I'm getting my speed density tune here shortly by Jason@SpecOps. Needless to say, I'm pretty excited.

 

I'm on SD and have taken trips from california to seattle with no issues. Also I was still able to pass emissions with it up in washington state