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Unread 05-21-2013, 12:46 PM   #1
Rich Z
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Default The tuning chapter...

Figured I would just go ahead and move the latest work done on my car into a separate thread, since most of it has to do with tuning lately. I may go back and fill in stuff that was done earlier so I have a record of what I have fiddled with in case I need to refer back to it.

Anyway, the latest, first....

Did another data logging run yesterday. I've noticed that the short term fuel trims were fluctuating quite a bit, so I wanted to disable closed loop mode to see what was going on.



Car ran really well in open loop, but seems to be running a bit rich in most areas of the VE map. I disabled the fuel modifiers last night and will do another run today or tomorrow to see if that helps lean it up a bit before modifying the VE (volumetric efficiency - B0101) table.
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Unread 05-21-2013, 02:33 PM   #2
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Sounds like it's running just fine to me!
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Unread 05-21-2013, 04:52 PM   #3
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Yeah, it does sound pretty good!

What probably isn't evident from the video is that when the car is accelerating, I'm actually holding the gas pedal relatively steady, trying to get enough data points in each RPM cell. It's actually the turbos spooling up that are making the car go faster. The MAX I had the throttle was 42.7 percent, but rpm climbed pretty quickly to 5252. Something tells me that I'll be hitting redline REAL FAST when I actually try 100 percent throttle one of these days.
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Unread 05-21-2013, 05:33 PM   #4
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Did you retain the factory traction control? Or have a rev limiter programmed?
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Unread 05-21-2013, 06:26 PM   #5
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Quote:
Originally Posted by 85vette View Post
Did you retain the factory traction control? Or have a rev limiter programmed?
Yeah, they both are still in the programming as best I can determine.

The rev limiter is set for 6900 rpm.

One puzzle I'm still trying to get an answer for is that EFILive shows a max value for engine torque of 640 ft.lbs. I'm sure my engine is producing significantly more than that at the crank, so I'm not sure what, if anything, the PCM does at that point when that value is exceeded. The PCM uses two methods to try to reduce power when it wants to. One is via reducing the timing advance, and the other via fuel cut off. If you've ever had a situation where you get REDUCED ENGINE POWER, you will likely have noticed that your gas pedal is effectively useless.

And I did not disengage traction control while driving the car doing these runs, but I didn't notice the engine losing power if traction control kicked in. Actually a couple of times it did feel like the rear tires broke loose under boost, though....
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Unread 05-21-2013, 07:32 PM   #6
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Yes, the traction control has a very generous limit on my CTS V also. I don't know what the perameters are but it will let the wheels spin quite freely. Only when I get really sideways does the gas pedal go away. Mine has the traction control and the stabil-trak, so if you get crossed up on a curve it will "brake" you out of it. Pretty amazing actually(not that I've used it alot) but these roundabouts up here can be a lot of fun! My car has a "competition mode" that shuts down both traction control and the stabil-trak systems. Part of that system encompasses the tire pressure sensors, and if one or more tires is low, or if the tps batteries are dead it won't let it go into competition mode. My rear tps sensors are dead so I can't get it into competiton mode. Probably a good thing.....
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