Из твоей ссылки на SAU, Igrok.
Р33 просто включает и выключает селенойд. Нет никакой еботни с нагрузкой и тд. Так что мой вариант работает. Р34 НЕО - другое дело.
Цитата(Sydneykid @ 14 Feb 2005, 05:33 PM)
Hi guys, all R33's I have seen have VVT, both GTS and GTST, 2 door and 4 door. Even Stageas have VVT. It varies the inlet valve timing only, does nothing to the lift or the exhaust timing or lift. The only RB25DE I have seen without VVT was in the later R32's. The R33 RB25DET has simple "on" or "off" VVT, it is "off" ЩА ЗАБАНЮ ЗА "ЩА ЗАБАНЮ ЗА "UP"!!!!! (Всевидящий админ)"!!!!! (Всевидящий админ) to around 4,500 rpm then "on" from there to rev limit. The "off" mostly is for emmisions and fuel economy, although it does help slightly with torque. The "onj" is for power, although it doesn help slightly with emmisions and fuel economy..
The R34 RB25DET (Neo, as it is sometimes called) has infiniitely variable VVT, the (later generation/smarter) ECU moves the inlet camshaft timing around depending on the load conditions (not just RPM). The Neo versions of the RB25DET are good for 206 kw, around 20 more than the R33 versions. They also have solid camshaft followers (R32 and R33 RB25's have hydraulic).
My 20 cents worth:cheers:
Цитата(Sydneykid @ 16 Feb 2005, 07:55 PM)
Let's kill 2 birds with stone stone here. I have the Datalogit plugged into an R33 RB25DET and on screen "Settings 1" it has the VCT set at 4,700 rpm. I have not changed it on this engine, so that is the default RPM as selected by Apexi. It doesn't have different "on" or "off", or "in between" or "load" or any other selection. Just RPM and just ONE RPM, so it turns on at 4,700 rpm on the way ЩА ЗАБАНЮ ЗА "UP"!!!!! (Всевидящий админ) and off at 4,700 rpm on the way down. That's it, no more complicated than that.
So tango, yes the PFC does have VCT control and it is adjustable, ie; pick an RPM.
How do I pick an RPM?
Well I do a power run with the VCT off until 8,000 rpm (ie; past the rev limit, so it never turns on). I graph that.
Then I do a power run with the VCT on at 800 rpm (ie; at idle, so it is on all the time). I graph that.
Then I overlay the 2 graphs, where the power curves cross is the best VCT change over point. Nissan's 4,700 rpm is pretty close every time, regardless of the engine mods. So it appears to me to be rpm dependant ie, the speed of combustion cycle. Load, throttle opening, power etc all seem to be irrelevant in a simple "on" or "off" scenario.
BTW, the power curves only ever cross at one point, so it makes no sense to have multiple "on's" and "off's"
In an R34GTT, with its more sophisticated VCT control via the more powerful and faster ECU, there are obviously other parameters taken into account. Logically to allow appropriate selection of the amount of inlet camshaft timing changes and the circumstances as to when they are required.
Hope that clarifies:cheers:
Цитата(Sydneykid @ 17 Feb 2005, 07:21 AM)
Let's start with the Tomei spes, what Tomei are recommending to me is to set the VCT switch point at 4,500 rpm on the ECR33 RB25DET using their camshafts. There is always a no switching point at low rpm as zero overlap is best for emmissions. That's is usually just above idle, but it isn't adjustable, well not on any PFC or chipped std computer I have seen. There is also the question of sufficicent oil pressure at idle (to rotate the camshaft), so switching is best left till above the fastest idle rpm. So Tomei say 1050 which should be above the a/c or other load compensation (fast) idle point.
OK max boost, they confirm two timing positons 0 and 20 degrees only. They say 1500 rpm for the lower limit, it may be a typo (1050 rpm). Or they are simply wrong. Either way a 1500 rpm lower limit wouild have it switching on/off/on/off at strange times for no good reason. They indicate 4,200 rpm as the switching point.
Lastly V6 performance, they indicate (on the graph) a single switch over point at ~4,900 rpm on the VE30DE from the 92-94 Maxima SE. But the words directly below say 6,100 rpm, so I assume that must be for the VG30DETT. Bit confusing. Note that the graph starts at 1200 rpm, just enough above fast idle with the VCT already switched.
Bottom line, I don't think we dissagree at all. The only issue I can see is the use of the words "on" and "off". Most people say "4500 rpm switch "on" vct". Whereas the more corrrect terminology would in fact be "4,500 rpm switch "off" vct".
:cheers:
Всевидящий админ сука ))))
всегда рад помочь))
