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Message: [QUOTE="euroford, post: 1537431, member: 17667"] as far as ZF6's at altitude are concerned, I think I have a fairly solid setup. Basic setup: swamps 250/200 hybrids, Adrenaline HPOP, typical supporting mods (studs, springs etc) and a KC 66/73 BB turbski with the .84 housing, i was one of the beta testers for the e99 version of this turbo. I've done some write-ups on here about it. tuning by Dave Armstrong, he has an excellent grasp as to what runs well up here, his first set of tunes were excellent, then he refined them a touch after i shared some datalogs from a couple of Bandimere runs. Its a great running combo for my purposes, mostly as an adventure support mobile running around the state mountain biking, skiing, kayaking and jeeping. Loaded up with the camper in the bed and the car hauler with the jeep or suv on it, i can fly up and over the mountain passes in my "hot street" tune with tons of power available and no need to stare at the EGT gauge. smoke is manageable, but can be plentiful at altitude. In the full out race tune its noticeably faster than the hot street tune. the ZF6 certainly makes drag passes a chore, but its still fun to get some laps in every now and then, and its an engaging challenge for sure. its been a couple of years since i've made a pass, but with my new turbo, good weather/prep and the -perfect- launch i think barely cracking into the 13's is possible. very tough on drivetrain components though. i've broken a ton of ujoints and always carry a spare (use only top quality spicer units), i'm on my 3rd clutch, i've blown a rear end into smithereens and i once blew my 6th gear (overdrive) into a couple of pieces. my first two clutches were southbend single disk units. these shifted fantastic and held the power, but had very short lifespans, maybe 15k miles. now i'm on a southbend "superstreet" dual disk. the superstreet is the same as the street dual disk, except the noise damping system is omitted, it rattles, but its more durable. the dual disk has proven to super durable, but shifts slower. i could shift instantly and bark the tires with the single disk, not so with the dual. i have a couple of little tricks to keep boost response up with the ZF6. first, be cognizant of heat and heat soak. make sure your filter gets cold air from outside the engine bay, and I have then installed insulation and heat reflecting materials to keep the airbox and ic piping as cool as practical. I installed a turbosmart blowoff valve and controller. this makes a great difference on boost response between shifts. i lost -no- boost with the single disk clutch and have very fast response between shifts even with the dual disk and the slightly longer shift time. I use an HKS electronic boost controller and a dual port turbosmart wastegate actuator. this insures my gate stays closed if i'm below my target boost and virtually eliminates backpressure when i'm fully into it. Its set for 30psi in my "hot street" tune and 46psi in my "race" tune. i drove wolf creek pass back and forth last week, passing everyone with a steady 30psi of boost at 1:1 backpressure and the egt's just under 1200, i was a happy camper. [/QUOTE]