viperbl Posted September 13, 2008 Share Posted September 13, 2008 Guys, I have recently built a K series with stock parts, vvc head, vvc cams and trying to use the vvc mechanism. I have taken it out for a blast, its pulling strong up to 6kish and then it feels like the soft limiter is coming into action ... I have checked the Emerald and it shows the limiter and soft limiter is @ 7500, but the tacho limit (for that session) is shown at 6400ish ... Now, I have a feeling that I have not fed the VVC mechanism in correctly, so this may have some bearing on this? Any help appreciated :) Rich Link to comment Share on other sites More sharing options...
rj Posted September 14, 2008 Share Posted September 14, 2008 I know nothing about Emeralds, but... I know that the software in the OEM ECU would lower the rev limit if the VVC mechanism was not working. Also I think I've read somewhere that if you always bang the limit, then it'll be adjustet downwards BB in the ECU. Could some of these wonderful features have been adapted in the Emerald? /r Link to comment Share on other sites More sharing options...
henry21p Posted September 14, 2008 Share Posted September 14, 2008 The stock vvc mems unit has a "rev limiter protection" built in. If you hit the limiter x times (or for more than x seconds) in any given period, it temporarily lowers the limit until your revs go under a certain threshold then it pops back up again.... The emerald doesn't (to my knowledge) do this. I've had problems with fake limits appearing on vvc engined car before. It can manifest itself if the 2 wires to the crank sensor are backwards (though don't just swap them!!!! check them) - the mems unit throws a paddy whereas the emerald ISTR is a little more tolerant. Also check the plugs to the top of the VVC mech aren't transposed - two of the plugs are interchangeable (despite being different colours). Link to comment Share on other sites More sharing options...
jackb_ms Posted September 14, 2008 Share Posted September 14, 2008 I second what Dave's said. I had some issue with my VVC setup and it was due to a VVC coil being dead Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
viperbl Posted September 14, 2008 Author Share Posted September 14, 2008 Cheers guys ... Had a look and the inc/dec for the VVC and is setup correct, the only thing I want to confirm is that its ok to use the common? earth for the crank and cam sensors? (Emerald Pin 32) How can you test if the VVC is actually working? I did some logs asking the emerald to show me VVT_control and VVT_target, both came back as 0 for all the runs! Link to comment Share on other sites More sharing options...
jackb_ms Posted September 14, 2008 Share Posted September 14, 2008 Drop me a mail and I can foward the e-mail Karl sent me to check how to check if the VVC cams are working ok. Jack Emily, The Very Yellow 21 Link to comment Share on other sites More sharing options...
viperbl Posted September 14, 2008 Author Share Posted September 14, 2008 not sure it should be soft limiting, but, from the looks of this graph maybe I am not going to get much power past 6500 rpm? I used to rev my 1,8 SS to 7500 rpm ... VVC Graph Link to comment Share on other sites More sharing options...
henry21p Posted September 14, 2008 Share Posted September 14, 2008 Mine used to do similar. 2 Identified problems that were cured and then it went away were: crank sensor wires backwards 2 plugs on vvc mech backwards Link to comment Share on other sites More sharing options...
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