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Willy

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  1. It's fine now. I never had the car tuned while the base timing was incorrectly retarded. It was only retarded last week for a few days when I incorrectly adjusted timing off the loop. You're right though. 9 degrees makes a massive difference. It drives 100% better now.
  2. Solved it! You guys were spot on. The old timing loop problem strike again. I found a bit of ignition lead and connected it between the coil and spark plug, then set the timing off that. Believe it or not, it was 9 degrees off! Previously I had tested the timing loop on the little timing wire loop at the back of the engine, as well as on the low voltage wires on the back of the coil. Both of these gave identical readings. Nissan must have some fancy timing light or something. I'm pretty sure the Vipec mechanic used the low voltage wires on the back of the coil, but maybe he had a better timing light than mine. The car is going damn well now. Very happy. Thanks for your help guys.
  3. Yeah I used the factory loop at the back of the engine, although I also tried one of the wires to the coil pack and got identical readings. I haven't tried putting a lead between coil pack and spark plug.
  4. I've had a V44 plug-in on my RB26DETT since 2008. I recently changed my timing belt and set the CAS back to roughly the same position. The car has been driving fine. The other day I checked the timing and discovered it was 10 degrees over advanced, so I retarded it by 10 degrees after double-checking with a different timing light. Now the car drives worse than before. It hesitates coming on boost and makes much less power. I removed the top timing belt cover and confirmed the cam pulleys were correctly lined up with TDC. I also confirmed the cam half-moon shaped key for the CAS is still in position and hasn't broken off. So I'm at a bit of a loss as to where this 10 degrees of offset may have come from. Does anyone have any ideas? Oh yeah, in setting the timing, I upgraded my firmware. I think I was about 4 or 5 versions behind the current release. Would this have caused any issues? In the base timing adjustment screen, the original offset (for 10 degree ref) was -82, as set by the Vipec tuner. Now it is -96 for the timing to be right. Do either of these numbers sound about right for an RB26? One other thing, I did change the timing belt somewhere around 2008-2009 after the Vipec install and tune. I went back to the workshop and they checked the timing and adjusted the offset from -80 to -82. I was wondering in my head if the timing belt was always off by 1 tooth, but the fact I've changed the belt once already and it made minimal difference to timing, makes me think the possibilities are very slim.
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