Hey all,
I'm tuning a built turbo LE5 with an 06 E67 controller and had a few questions to ask y'all, but first a quick rundown of my setup:
Wiseco 8.x CR pistons
Carrillo rods
ZZP LE5 cams
Supertech springs and retainers
Werks EFR 6758 turbo kit with 3" intake setup and 3" thick FMIC
3" catless turboback exhaust
Siemens Deka 60lb injectors running @ 5.0bar with return fuel system
3 bar MAP sensor
currently running ~22psi on straight 93oct
running full time OL and MAF-only tune
Had to rescale the tune due to not being able to rescale the load axes past 1.36g, and I have the tune dialed in very well for the most part, but the following had me wondering.
a) Why can't I get VCM Scanner to display more than 255kPa despite running a 3.0bar MAP sensor, what am I doing wrong here?
b) Why is my indicated IDC so low, if you do the math starting with IPW it should be double. I am using the correct PID for IDC I have checked and double checked this numerous times already. Might this be some sort of artifact from running a rescaled (50%) tune? Doesn't make any sense to me why it should...
c) My MAF readings appear to be unrealistically high (once you x2) for an EFR 6758. What I did was to take the stock MAF table, multiply everything by x1.13 or thereabouts, and smooth the near-idle cells. The stock LE5 intake is 2.75" and the supplied Werks intake is 3" so my math isn't too far off. Fuel injector flow rate and offset tables are spot on, and actual lambda follows commanded PE very closely, so I don't see where the difference is coming from. This doesn't really affect anything tune wise so its just curiosity on my behalf
d) How useful is it to tune the VE tables and run a blended tune? Car runs very well as is so I'm not sure the additional effort is worthwhile
e) Regarding cam phasing, the stock LE5 cams have centerlines of 135 for the intake and 125 for the exhaust, with a control range of 25deg, since that seems a little low to me coming from other platforms I'd like to confirm the following. Is the 25 deg in question measured w.r.t. to cam timing NOT the usual crank timing? In other words, are the effective lobe center control ranges 85-135 for the intake and 75-125 for the exhaust, or are we looking at 110-135 and 100-125 instead? The former makes a lot more sense intuitively, as the latter control range is too narrow given what I am using to seeing elsewhere. Knowing this would better help me model my setup within EA Pro and arrive at a better baseline calibration before hitting the dyno, which I was planning on doing sometime next week, so any input is much appreciated!
solstice rescaled drive home4.hpl