Good morning, all. I have a very simple question, but have gotten many, many conflicting responses from my research just need to know the answer to this question(s):
The E78 ECM in a Cruze 1.4t. Variable cam timing, WOT tables. Is the following correct?
Intake, WOT table:
0 = parked (6.5-8.5 degrees BTDC) (I have seen varying numbers, the idea being that they are parked in that range before top dead center)
+1 = X degrees of retard in camshaft rotation
n > 0* = retard (or rather, camshaft degrees of retard from the parked position, which is 0)
Exhaust, WOT table:
0 = parked (6.5-8.5 degrees BTDC) (I have seen varying numbers, the idea being that they are parked in that range before top dead center)
+1 = X degrees of retard in camshaft rotation
n > 0* = retard (or rather, camshaft degrees of retard from the parked position, which is 0)
The rest I am asking, if because I have see conflicting info; some say that both cams can ONLY retard from their parked position. Others have stated that the intake can ONLY advanced from parked, and exhaust can ONLY retard from parked.
The stock tune on the E78 for the cruze 14t has the intake cam starting at low numbers and gradually ramping up, while the exhaust cam essentially dives down and STAYS down around 1* in those tables (which when logged, shows it chillin around 9-.95*, which I have to assume is retard, keeping the exhaust valve closed earlier, allowing the turbo to force more air into the cylinders).
Basically, what I am asking is this: On BOTH cams, are the BOTH retarded from parked (regardless of the number) or is the intake ONLY Advancing, and exhaust is only retarding (as positive numbers from from 0, or their parked position.).
I would greatly appreciate anyone that has some definitive insight on this, as for v8 and v6 applications, there is a lot of info, but it varies from platform and gen to platform and gen. I just need to know what the tables I have to work with actually do.
Also note that I am not talking about the low/me/high tables. PURELY the WOT tables for the intake and exhaust VVT tables.
Thanks for any info you can give me on this that is vetted and proven. I don't have access to a dyno, and WOT run kill gas hard and the cops don't much care for the noise and such.