One thing I've noticed with mine, is that when going from light throttle cruising, to medium throttle, the engine seems to try to stay in mds even with increased load, and sounds like it's lugging and then i get some drone through my exhaust ( non-stock).
Is this normal for the newer engines? I had an '07 RT prior to this vehicle, and it seemed like there was no hesitation coming out of mds under a mild throttle load.
If it is normal, is there something in the tune besides the throttle adjustment in the diablo tunes, that can be adjusted to eliminate this?
2010 RT w/ Road and Track, Solo hi-flow cats and Corsa sport cat-back, srt8 airbox w 2011 R/t tube. Diablotoona was here.... looking for an '06-08 daytona factory exhaust
The original software in my 06 was pretty sensitive to throttle position and would come off of MDS really early. A software update that I installed 3 years ago has a much more agressive MDS schedule and I'm having the same experience as you are. At low speeds in traffic I dump it into autostick (4th) to give me some peace.
Pedator, CAI, MDS indicator, ESP/BAS defeat switch, Tranzformer, blacked out wire mesh grille, smoked and flashing side markers, 9005 2400k 65W fogs, Euro rear fogs, debadged and demolded, 255/45/20 Nitto 420's, Boss 338 wheels, painted calipers. Glovebox & cup holder LED Mod. Blastin Bob 6db reso delete pipes. Euro LED side signal repeaters, 55/35 window tint, BT catch can. Color matched tail lights. Custom front lip. LED interior lighting.
Next: Lower with BCR Coilovers.
Montreal, what sort of update? one required by using a predator tune or a dealer flash? That's one thing I miss about my '07, was how smooth it was. Anyhow, I've noticed something that may help both of us in this regard on the diablosport forums. It seems like people are having their tunes adjusted to smooth out mds transition. Think I might give it a try.
When I bought my Predator three years ago and logged it to the Diablo site, I got a notice that the OEM software needed to be updated before I could use the Predator. As far as smoothing it out, it would be nice but when highway cruising I have noticed a difference in fuel economy so I'm willing to live with it for now. 26 mpg is pretty good.
I have an '05 and the dealer also did a PCM software update around the '07-'08 timeframe. I noticed some changes in MDS behavior afterwards - specifically it was a bit more noticeable and would load the engine more in 4cyl mode before kicking back into 8 cyl mode whereas it was undetectable when new. After adding a Predator tune, TB, CAI and cat-back, it's MUCH more noticeable. My theory is that the engine is making a bit more power than the program is expecting and feels that it doesn't need to switch out of 4 cyl mode as readily - whether it's because of electronic torque sensing or vacuum activation, I don't know.
I'm guessing with your exhaust and intake mods, it was enough to make the MDS activation/deactivation noticeable just like it did for me. I'm considering getting the MDS smoothing done by Diablosport, but at the same time I'm considering a heads/cam install so I might just wait...
2005 300C Magnesium Pearlcoat
BBK 85mm TB, Volant CAI w/lower duct,
2006 TCM swap
DS Predator 91 CAI canned tune
Borla cat-back 140112
SRT struts/springs + Hotchkis sways
Daphod, if you get the smoothing done before i do, can you please post how it is in here? Also, yes, mine was noticeable with even just a corsa cat-back, almost acted/sounded like mild pinging. With the solo exhaust and cats, well, i tried a canned tune for a bit, and now run a tune without mds right now.
Since original post, I have gotten an email tune from Johan (diablotoona), I still have to do some datalogs for him, but the overall drivability is vastly improved. Light to mid throttle, engine no longer hangs up trying to stay in mds, and the transition is smooth coming on and going off. I'll update more later.
I would do that as well, until i had mds shut off in the tune. I figured since it's on the motor, do some road-trips every so often, I might as well try and get it more user friendly. I look at it as, I'm getting srt mileage, without all of the srt power. lol
Too simplistic? maybe.
Anyway, started data-logging for Johan. Serial cable to USB issues not withstanding. Initial drive-ability seems a lot better compared to previous tune. More smooth going into and coming out of mds, and the mds sound seems more tolerable.
Will update later.