HB280ZT Posted February 23, 2009 Share Posted February 23, 2009 Hi All, Well I am chasing down an issue with PW and duty cycle spiking up and down with the TP being constant, this happens at rpms above 3500. Not sure how to explain it better then that so here is a datalog that shows it towards the end of the log. Look around the 324 time period. Thanks for the help. HB280ZT datalog200902221012.zip Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 23, 2009 Share Posted February 23, 2009 While the trace looks steady, it seems there is a bit of noise that is too small to register in the line but enough to trip your AE. Try turning up your TPSDOT or MAPDOT threshold as appropriate. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted February 23, 2009 Author Share Posted February 23, 2009 Matt, In my acceleration wizard window I am running a 30kPa/s MAPdot Threshold and a .977v/s TPSdot Threshold. So you are telling me to up these numbers to compensate for the change in PW and duty cycle, is that correct? Also when I look at the datalog (in excel) I am seeing the following chages at or around time of 324: 324.204 PW 7.1 DutyCycle 19.5 324.332 PW 5.2 DutyCycle 14.3 324.588 PW 6.9 DutyCycle 19.0 324.971 PW 6.8 DutyCycle 19.3 325.099 PW 4.9 DutyCycle 13.9 325.354 PW 6.1 DutyCycle 17.8 325.482 PW 4.8 DutyCycle 13.6 The reason that I am looking at this as a possible problem is because I am chasing a flutter issue in my car under part boost and everyone that I talk to at several different turbo places (all the big turbo distributors) say my problem is tuning related. Also at this time the car was fluttering when I logged this datalog. So am I chasing my tail or what?????????????? I have been working this problem going on several years now with no solution. Thanks for the help. HB280ZT Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 24, 2009 Share Posted February 24, 2009 Are you using MAPDot or TPSDot acceleration enrichment? I'm not able to tell from the log. You will need to increase the threshold on whichever one you are using until the problem goes away. I can't tell you how far it needs to be increased from the log. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted February 24, 2009 Author Share Posted February 24, 2009 Matt, Thanks, will give it a try! I am running MAP-Based and here is my table: 3.0m/s 250kPa/s 2.5m/s 150kPa/s 1.5m/s 100kPa/s 0.5m/s 50kPa/s I will bump them up a little to see what happens. Thanks Harry aka HB280ZT Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 24, 2009 Share Posted February 24, 2009 Try a MAPDot threshold of 75 and see how things go from there. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted February 25, 2009 Author Share Posted February 25, 2009 While reading the MS extra manual I came across this statement: "You can also turn just the Decel off in either mode when in Boost, this is to prevent the ECU cutting fuel down (using the Decel) by you simply easing off the accelerator a little when in boost." The reason I mention this is because I noticed that my Decel light comes on when the PW and Duty cycle spike. So that being said when in boost is when I have this problem so back to the statement. How do I turn out Decel when in boost? HB280ZT Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 25, 2009 Share Posted February 25, 2009 Go to Basic Settings -> Accel Decel Mode. Set "Turn off decel enrich when" to "above kPa level" and specify the kPa level (usually around 100). Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted February 27, 2009 Author Share Posted February 27, 2009 Matt, Well I made the changes and it helped some but still not right. Here is a very short datalog and my last msq. Thanks for the help. HB280ZT datalog200902252150.zip megasquirt200902252230.zip Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 27, 2009 Share Posted February 27, 2009 You may need to raise the MAPdot Threshold further. Alternatively, you can turn this off under boost in the Accel Decel Mode screen as well. Quote Link to comment Share on other sites More sharing options...
HB280ZT Posted March 4, 2009 Author Share Posted March 4, 2009 The other day I got a chance to run the car on a dyno, here are the results: http://forums.hybridz.org/showthread.php?t=145297 HB280ZT Quote Link to comment Share on other sites More sharing options...
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