Len Posted November 22, 2003 Share Posted November 22, 2003 Do you notice as the weather gets colder. You need to lower your boost to avoid detonation? Colder air; more condensed with same amount of fuel being constant. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted November 22, 2003 Share Posted November 22, 2003 it shouldn't be much of problem on EFI set up since it can sense air temp. But yes, my car will ping when cold when my car isn't fully warmed up. fixed the problem with new thermostat and now I seem to be able to run just as much or more boost Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted November 22, 2003 Share Posted November 22, 2003 If the EFI calculates air mass correctly, according to the measured temperature, and you still ping, you might be running out of injector duty cycle and running lean. Quote Link to comment Share on other sites More sharing options...
fl327 Posted November 22, 2003 Share Posted November 22, 2003 take advantage of the cold, you can tune around it and make for some nice driving, when its dry of course. hit my first real detonation last night, spiked 18, I was kinda relieved though, didnt start pinging until 16, audibly that is! Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted November 22, 2003 Share Posted November 22, 2003 ya thats a normal thing with turbo cars.. it was a night and day difference in my friends wrx when it was cold out. same with my boys TT Z's.. its quite nice mike Quote Link to comment Share on other sites More sharing options...
Afshin Posted November 22, 2003 Share Posted November 22, 2003 If your fuel delivery is not maxed out then the EFI will adjust appropriately for the cloder/denser air. And since the cooler air is less prone to detonation, you can actually turn up the boost without any detonation. When I had my old 280z turbo and another 280zxt on the east coast, both non-intercooled, I could turn boost up 1-2 lbs in the winter over the summer time. Only if your fuel delivery is maxed out at your current boost, could you possibly get more detonation because of leaning out. If your car is detonating when it is cooler, it most likely a prbolem with your EFI, such as non functioning temperature sensor causing the problem. Quote Link to comment Share on other sites More sharing options...
Guest bastaad525 Posted November 23, 2003 Share Posted November 23, 2003 How does the ZX sense air temp? There's a little sensor in the AFM right? I have the Grainger valve style boost controller, and it used to worry me too, it would run noticeably higher boost in cold weather, well only about 1psi... was very frustrating at first, I'd set it to 10 psi and then at night it'd always go up to 11. Now I kind of like that it does that... It takes advantage of the cooler intake charge, but now that you mention I do worry a little about the higher oxygen content.... I haven't heard one ping yet so I"m not too worried about it, and the car definately has more power when it's cold out. Quote Link to comment Share on other sites More sharing options...
Len Posted November 23, 2003 Author Share Posted November 23, 2003 Thanks for the input guys. During summer I adjusted my air (Boost) to my maxed out fuel systum. I was running 17/18 psi boost on stock t-3 @ 42 psi fuel pressure. 370's. 60mm TB, NPR I/C, 2 1/2" DP, 3" exaust. 83 STOCK electronics :| Ran nice. Now with the weather colder. I noticed the dreaded rattle/ping of detonation. My antiquated adjustments I have to work with are as follows: Timing FPR Dawes (Grainger) Boost adjuster AFM Now with my fuel pretty well maxed out. That leaves my Boost controller (my air control) as only adjustment. I Have the AFM and that will adjust air/fuel mix according to air temp, to an extent. But at WOT shoving 18psi I wouldn't think to much temp adjusting with AFM is happening Kinda like force feeding air. Since air is denser when colder as compaired to summer (like a awhsome wintertime I/C ). And as mentioned before; I had everything adjusted or maxed out for summer. Using what I have to work with. I just figured that the colder condensed air changes the senerio to where I need to lower the boost to adjust my mix Just wondering If you guys with similar setups; came up with same theory. Quote Link to comment Share on other sites More sharing options...
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