EvoJoeIX

iTrader: (16)

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

BoostFTW05

iTrader: (4)

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.

EvoJoeIX

iTrader: (16)

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

4k a sti

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

BoostFTW05

iTrader: (4)

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

hitman28

iTrader: (5)

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

EvoJoeIX

iTrader: (16)

that can be fixed

4k a sti

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

xcelr8

iTrader: (7)

I dont have that problem

EvoJoeIX

iTrader: (16)

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

EvoJoeIX

iTrader: (16)

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

BoostFTW05

iTrader: (4)

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.

EvoJoeIX

iTrader: (16)

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

ch53avitech

iTrader: (37)

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

UsafEvo

iTrader: (8)

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