Saabretooth 8 Report post Posted June 1, 2014 Having this really weird issue. Engine just cuts out when I brake hard, clutch in and shifting down going into a turn. Can't figure out what's wrong. Am narrowing it down to a loose wire Weak fuel pump Weak Fuel Pressure regulator Weak Master clutch pump (I think when I clutch in to change gear, the pump didn't fully disengage the clutch.) happens to feel like engine rpms are dropping and then revs up again to a normal idle even when its clutched in, ie disengaged. Slave Clutch pump has been changed 2 months ago. On top of that, I CANNOT hot start the car if I turn the key, wait for diagnostics to complete, then crank... no starter cranking action at all! BUT if I just fast crank start it, it sparks to life, without having to go through the diagnostics. Smaky, I need your help... its irritating the shit out of me.... Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 2, 2014 Plug it in and check for fault codes, but this sounds like either a bad earth to the gearbox or the crank sensor is failing. Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 3, 2014 (edited) They found some very wet plugs. .... They are only 30k km old Edited June 3, 2014 by Saabretooth Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 3, 2014 Nowt wrong with the colour of them. Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 3, 2014 It was pretty wet with fuel apparently. Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 3, 2014 Has this been remaped? Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 4, 2014 (edited) Yes. It was running fine till I changed out the throttle body from 84mm to 78 mm diameter. And intake piping too. Sent from my SM-N9005 using Tapatalk Edited June 4, 2014 by Saabretooth Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 4, 2014 Well, think I'd go back to as it was then. Quote Share this post Link to post Share on other sites
Judge_Joolz 0 Report post Posted June 13, 2014 Why did you go DOWN in TB size? It is more usual to go UP in size. Quote Share this post Link to post Share on other sites
Judge_Joolz 0 Report post Posted June 13, 2014 (edited) duplicate Edited June 13, 2014 by Judge_Joolz Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 13, 2014 Cause my mech mixed it up. I was supposed to get the 78 mm TB and my bust buddy, 84 mm. None of us knew any better until we did a comparison after our was installed. Which by then I had it mapped. Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 15, 2014 Is a lesson being learned?? Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 16, 2014 Actually, I thought the ECU had a wide enough tolerance to adjust for the variance. In anycase, the mech at another workshop narrowed it down to to possible vacuum leak or brake pump issues for the engine dying off under braking + clutching in. Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 17, 2014 Did you know it's proven that once the throttle body throat is larger than the inlet ducts there is no benefit in fitting a larger one??? Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 17, 2014 Yup. I'm not on a stock plenum Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 17, 2014 That still doesn't matter, if you still have standard inlet ducts and valve sizes then there is no way it will improve anything. Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 23, 2014 The plenum throat is much bigger. I had the option for bigger valves. Not sure what you meant by inlet ducts though. My experience is that the peak hp and torque isn't going to be much different from a well tuned standard TB and plenum. But I find that the torque comes in earlier and smoother, and over a bigger spread of rpm. Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted June 23, 2014 Inlet ducts = the 6 shiny pipes between the plenum and the head. Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted June 23, 2014 Got it. Thanks Sent from my SM-N9005 using Tapatalk Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted July 1, 2014 Smaky, on that topic, I have access to 46mm inlet pipes that would be part of what you suggested. Which makes me think that I would also have to bore the inlets on the engine side as well to match the 46mm piping. Anything else to take note of? Quote Share this post Link to post Share on other sites
Smaky 73 Report post Posted July 2, 2014 You are now on the thought line with me, the exhaust would also have to be opened. Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted July 2, 2014 Am now on CF2 with equal length pipes which is about 2.5" up to the stock cats After which is connected to a Novitec silencer and a set of Novitec Quads Quote Share this post Link to post Share on other sites
Saabretooth 8 Report post Posted July 22, 2014 Smaky, I had the tune checked, it did not affect the engine dying. I'm going to strip out the Cam position Sensor to see if its worn or whatever it is that causes the engine to die on me. And now its having trouble restarting after a drive, especially those short slow traffic drives where the engine bay is really hot. would need it to take about 2-3 hours for it to cool down first before I can restart it again. Definitely nothing to do with the tune. Sent from my iPad using Tapatalk Quote Share this post Link to post Share on other sites