i just dont get it
Dec 20, 2006 | 08:29 PM
#51
Originally Posted by FarmTruc
How is a truck supposed to run more than 12degs of timing if it's already pinging and the a/f ratio is fine??? The truck was running 13psi, which is too much for the Radix, so 12degs if fine. It's not a tune problem. Max timing was achieved, a/f ratio was setup and that's all you can do.
"really didn't need a SD tune" why is that? SD tunes pull smoother, have better control over a/f ratio, and the computer actually understands boost, so it's a better tune for forced induction. My truck dropped .3 tenths going sd tune, so they do work! What's your reason, have you done any sd tuning?
Get a better tune? Max timing and good a/f was set.
Thanks for the input,
allen
"really didn't need a SD tune" why is that? SD tunes pull smoother, have better control over a/f ratio, and the computer actually understands boost, so it's a better tune for forced induction. My truck dropped .3 tenths going sd tune, so they do work! What's your reason, have you done any sd tuning?
Get a better tune? Max timing and good a/f was set.
Thanks for the input,
allen
But...I just dont understand why you would run a 2.75 pulley that puts the radix way out of its effeciency range. Unless you find a way to keep the intake temps down, the 2.75 pulley is a waste of time on a 5.3. 3 meth nozzles did not fix the IAT problem.
Running more timing with a 3.0-3.1 pulley will net better results. You wont be working the blower and drivetrain as hard. If the radix could produce 13 psi effeciently I would consider the 13psi/12 degrees combination. More boost is not always better, especially with the radix. I would not be suprised if he can get 21-22 degrees of timing with the meth and a 3.1 pulley.
I ran 18 degress of timing with my 5.3 and ran consistently 13.4-13.5 on 22's with 2.2 60's. Truck ran great. I went the 3.0 pulley route with problems just as these. At that point, I upgraded the heat exchanger, ran a bigger pulley with more timing and the truck ran a lot better.
