:Abosluetly. Knock sum, knock count, etc...Thats why you have a detonation sensor =)
Its just that Nissan monitoring equipment hasnt been very keen on doign such.:Hmmm, you could be right on this one. I guess with something like the Zemulator, perhaps you can use the detonation sensor to 'measure' detonation. But my det sensor is bad anyway :) I've got the resistor trick going. :That means nothing. You coudl ahve the biggest turbos in the world and still have 850C+ EGTs.: Obviously! BUT I said at the same boost levels. IE, my turbos making 14psi vs stock turbos running 14psi, my turbos will be cooler, and my EGTs too. Sure you could have high EGTs on huge turbos, but at a lot higher boost. TD-06s @ 14psi are going to be a lot cooler than my turbos. :LISTENING for detonation is NOT a safe way of tuning a car. If you are HEARING detonation, then you have way way too much of it. This is an expensive engine. peopel with far less valuable cars spend far more money and efort making sure they detect knock before its audible...: And I acknowledged this: "I know that it can't always be heard." And I never said I was tuning my car by listening for detonation. Nor that I was tuning my car. And I wasn't really listening for detonation either =P I looked down and saw the boost level, and after I let off, I thought back (and I definitely wasn't alerted by any pinging sounds) and knew that I hadn't heard any detonation. Besides, soon I won't have to worry about detonation at 17psi with 555s. :Ya know. Im just not sure I buy it
- 17psi on stock injectors seems far too much. Does anyone have duty cycle numbers for 17psi on stock turbos? A/Fs? EGTs?
- 17psi on a bigger turbo woudl just complicate the fuel problem. 17psi on Sport 500s would surely be too much. Thats far too much air to flow for 370cc injectors. Do the math, what is the cfm rating on stock turbos anyway?: Well if Coz and Chip buy it, I certainly do. I've seen many many people successfully run 17psi on an all stock setup (save stage III components). Even had a few people tell me about hitting 18psi and being fine (on a dyno at that - A/F was not lean). I've read a lot here too. That's what my 7x,xxx hits will get you, not your 7,xxx :) Not to mention the 100,000+ hits from Coz and Chip, and the fact that they sell Z parts and work on Zs as businesses. :It doesnt make sense. When I first got here I did alot of research on that subject. Jim Wolf told me 14psi was max, SEARCH told me it 14-15psi was max, and other people told me 15psi was max. When we dynoed I ran leaner that I woudl have liked on 14psi...: See above. Lean on 14psi though? Maybe you should check out your fuel pressure, that doesn't sound right. :Id liek to see some numbers. what is the cfm rating on the stock turbos at 15psi?: Sorry don't know.. Maybe we should search? :) I don't mean to be in an arguing battle here, I'm just saying what I've read on here, learned on here, and experienced myself. 1,000 miles of 15-16psi on Sport 500s/stock injectors has yielded no problems, and no audible detonation. Detonating under boost for 1,000 miles over 3 months probably would have yielded some bad results if I were detonating. And my timing is at 15 degrees, so little possibility of detonating because of advanced timing. But in the best interests of my engine, I agree unheard detonation is a possibility, and hence my plan to get 555s. And again, I'm not trying argue with you, just playing the points I feel that I'm fairly certain on :) Kez
 "Pulled the blower fan down from behind the glovebox and there was a mouse nest inside the cage fan - mom and 6 babies. Mom was dead and the reason for the smell - petrifying fast - but the babies were hanging on. At least until I fed them to the cats." [ZXtaZTT - June 19, 2002] |
