Guest |240| Posted January 15, 2009 Report Share Posted January 15, 2009 I had a Vi-pec PNP ECU running my 300zx but I have one problem and I can't figure it out. under full throttle the car would run strong up untill 6500 rpm then the car just fall on its face, then start building boost again on the dyno we went through the log many many time to see if there was any thing looks wrong, but no. the spark plug gap was check, it wasn't a misfire, mixture is at between 11.5:1 AFR around 20psi and 500whp on 92octane pump gas. the ecu is running on nissan OEM optical disk, but every once in a while it will pull through to 7500rpm. any body have similar problem? or knows what else it might be? Quote Link to comment Share on other sites More sharing options...
rayhall Posted January 15, 2009 Report Share Posted January 15, 2009 Does the manifold pressure drop badly when this happens. Can you send me a log. I had a Toyota Landcrusier years ago that would do the same thing. It took me a long time to find the problem, as I was looking for something complicated as the cause. It turned out to be the 90 deg hose on the air inlet of the turbocharger sucking flat. Quote Link to comment Share on other sites More sharing options...
Guest |240| Posted January 15, 2009 Report Share Posted January 15, 2009 yes it does. the boost would fall badly then it regain again. sorry I will try to save a log and send it to you. but if I have the boost running on just the spring it would be okay. seems like it would lower the the act up rpm as the engine gets hotter. but alway at around 6K-6.5K rpm. Quote Link to comment Share on other sites More sharing options...
rayhall Posted January 15, 2009 Report Share Posted January 15, 2009 Yes more boost means more air flow and heat means softer hoses. It may turn out to be something totally different, but all possibilities should not be ruled out. Are you sure you do not get trigger errors when this happens. Does the trigger error count stay at zero. Quote Link to comment Share on other sites More sharing options...
Guest |240| Posted January 15, 2009 Report Share Posted January 15, 2009 the turbo has no filter it just sit open, but when this happen the engine still runs smooth except drop in boost, in the log the rpm would climb and climb but then boost drop the rpm fall a little like I would back the gas off then back on again. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.