MARKTURBO Posted July 28, 2022 Share Posted July 28, 2022 Hi, I have merged the A3CV rom with my BA Auto rom. Im having trouble getting it to overlap the timing under 3500rpm and TP REL more than 300. As I squeeze in the throttle it over laps till 300 TP REL then drops back to 0 overlap and has a 20 degree exhaust cam error untill I throttle back under 300 REL TP. Under full throttle power run it overlaps at about 3300rpm abruptly. I cant find how to get it to overlap under full throttle under 3300rpm. Any one had this issue? Cheers, Mark ba-F6 cam control.tec Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted July 28, 2022 Share Posted July 28, 2022 Exhaust cam error means a hardware issue. If it's software you won't see an error and it will simply command 0 deg. Otherwise check oil pressure, big heavy valve springs and high boost will give you grief as well, especially on an old ba that probably has gummed up oil feeds to the VCT actuator. Drop boost and try again when the oil is cold, if the problem goes away it's most likely an oil supply issue. 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted July 28, 2022 Share Posted July 28, 2022 Tuned an engine with the early style vct solenoids that couldn't control the cams with more than about 14psi of boost, after it had a valve spring upgrade. Quote Link to comment Share on other sites More sharing options...
MARKTURBO Posted July 28, 2022 Author Share Posted July 28, 2022 Hi, I think I may have explained wrong. The overlap works, up until REL TP 300. Over 300 it then goes back to 0 overlap. If I ease off the throttle it ramps back on again. I can repeat this many times. Ill log it and post. Its only making 9 psi at that point. Thats why I want it to overlap to get the Crappy Aeroflow turbo to come on a bit sooner and make low end torque. It has stock valve springs 177,000km. 28-07-2022 06-11-27 PM Log.teclog 1 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted July 28, 2022 Share Posted July 28, 2022 I'm not on a pc could you post a screenshot. Does it instantly go to 30deg error? Or does it happen slowly? What it you hit 299 rel and hold it there? How much boost do you get and what happens? Quote Link to comment Share on other sites More sharing options...
MARKTURBO Posted July 29, 2022 Author Share Posted July 29, 2022 It happens instantly, not progressive. 299 is still about half throttle so its about 6psi at 2500rpm. if i could use full throttle would probably make more boost. Its more like 280 TP REL. But hard to hold there steady and just slightly move throttle with the logging rate so slow. Quote Link to comment Share on other sites More sharing options...
hjtrbo Posted July 29, 2022 Share Posted July 29, 2022 Just a side note about the logging, if you can keep it to just a handful of channels whilst you deal with this particular issue you should get about 16 hits a second. Some channels you get for free. You'll know which ones because when you add them the logging rate won't change. Make sure "Rate" is selected to be displayed in the logger channel list. For example just to diagnose this issue you could consider the bare bones of RPM, TP, 5 x cam channels and MAP. Quote Link to comment Share on other sites More sharing options...
MARKTURBO Posted July 29, 2022 Author Share Posted July 29, 2022 Cheers for that mate Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted July 29, 2022 Share Posted July 29, 2022 Ba doesnt support rapid packet so you really have to cut down the number of channels you log. The logging rate in your logs makes it too hard to see what is going on. Quote Link to comment Share on other sites More sharing options...
dat111 Posted July 29, 2022 Share Posted July 29, 2022 im following this, trying to figure out if i am able to do it on PRO, Quote Link to comment Share on other sites More sharing options...
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