Re: Heads, Cam, Exhaust
MDS with the cams I used really works good on both my Hemi's. It's on almost all the time now, even on modest hills. I just got back from my first trip (~2000 miles) with my FRI Sidewinder cammed (6 degree advanced) Hemi LX. I got between 450-514 miles per tank (except at 6000-7000 ft. with high headwinds) and I estimate ~85-90% MDS on time, even at atltitude. Most of this (~75%) was at altitudes of ~3000-5000 ft. elevation. My WK doesn't do quite as well though, and weight (about 500 lbs. more) is one of the factors, along with aerodynamics (.36 drag coefficient for the LX, and .39 for the WK), parasitic drivetrain loss, and only 2 degrees advance on the cam. Now that I have the transmission pretty much set up the way I want, I'd like to do the same trip with it to see how it does. For me, the only way I'd lose the MDS is if I were building a race motor. MDS on mine usually makes ~2-3 mpg difference and the exhaust I have on both make the MDS on hardly noticeable. Any loud exhaust system would definitely be annoying with the 4 cylinder drone.
05 LX/RT and 06 WK/GCO, (modded similarly) with MDS "ON" Light, Vortex Gens, Debadged, DashHawk, BT Catch Can, SRT CAI W/Add Air Inlet, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tuning App, DS Tuner, Cust tubular headers w/3 in. catback, Bilsteins, SRT frt/rear bumpers, Eibach SRT Lwr Sprgs & Sways, FRI Sidewinder Cam Adv 2*, 6.1 valvetrain, SLP 25% UD Pulley, BBK 85mm TB, SOS Coils/.060 spark plug gap.