Zero to 60 in 15 seconds?? What a slug!!
I best that by 3 seconds on my stock tune and almost 8 seconds on my high performance tune.
I also have 3.42 gears, what do you have in that truck? 411's.
I love how the truth is put out there for me and proving my point from the very people saying that the ATT is better. NOT!!!!
Look at these vids and watch a 6.5 speedo really move my friend.
GM 6.5 Turbo diesel HX40 hybrid High Performance tune,
Stock
I also have done back pressure tests on both turbos and the reason the ATT is so low is that the 6.5 can't generate enough drive pressure through the ATT's BIG un-gated housing to make it a feasible option below 2,500/3,000 rpm.
What some fail to understand is that you need some B/P to drive the turbine which in turn will create boost.
To much B/P creates heat and chokes the motor [stock turbo] and not enough D/P and you get sluggish performance compared to a turbo that has both the compressor and turbine sized right for your application.
The Att compressor is small and the turbine/housing is big which isn't ideal but is the reason it even makes a decent amount of boost at all even though the D/P is so low it doesn't turn at the desired design specifications.
The ATT doesn't make boost because it doesn't have the needed D/P to spin it to the level it will make sufficient boost on the 6.5 especially in the lower RPM range.
My HX is about 1.2.1 up to about 18/20 lbs.. When I'm at 28lbs. of boost I'm at around 37 lbs. of B/P.
Let's see some numbers from the ATT guy's as well as some vids that show how great it is not just pics of a truck hooked up to your PARKED truck LOL!!!!
Instead of attacking me let's have a real debate about why the ATT isn't the best turbo out there.
Just because it's a bolt on setup shouldn't be a reason to defend it. There are people out there who will make whatever elbows/adapters one might need to run a better turbo/setup.
RZ.
You see I was running 23 LBS of boost (Bout as much as you would want to run without an intercooler.) with HX40II and only 14 LBS of boost with the ATT! We know the ATT can get 17 PSI on this engine, but, these rollers have trouble winding it up. Regardless the ATT is not working the engine as hard with lower backpressure and boost numbers to get near the same power. So less boost by 50% and nearly the same power.
