- Joined
- Nov 14, 2009
- Messages
- 1,548
By dumping the CSV log files from ECUtalk into Excel.... and graphing the data.That is interesting. How did you produce that?
Andrew
By dumping the CSV log files from ECUtalk into Excel.... and graphing the data.That is interesting. How did you produce that?
Andrew
By dumping the CSV log files from ECUtalk into Excel.... and graphing the data.
If you can get the vehicle within about 40 meters of your desktop, a long cable would be a worthwhile try.. Certainly cheaper than a laptop.Mmmm ...... that's easy enough, isn't it. If I didn't think I might have to buy an EGR valve soon, I'd probably go out and buy a laptop so I could do that.
Andrew
Does anyone have a template for a blanking plate (ZD30 with stepper motor EGR valve) .......... so I can make one before I do any dismantling.
Mmm .... what a dummy I am. Nissan have those, don't they. They call them gaskets - and I'd need one anyway if I take the valve off. :doh
Andrew
Have you yet blanked the EGR via a plate?
Bear in mind, doing so for testing will create other goings on, so dont confuse these with your original issue.
Right. Firstly you are not quite right with your anticipated result of holding the vanes in the closed position.
You will get VERY HIGH boost pressure, certainly in the midrnage (1500-2500rpm) under any sort of load, so be careful.
From alittle experience with the ZD but alot of experience with the vw tdi
Maybe I'd better give that a miss then
One thing I've been trying to wrap my head around is that the VW Tdi folks seem to address boost pressure spiking by lengthening the VNT rod - but the Australian Nissan Patrol folks think it's right to adjust the VNT stop screw.
I haven't yet managed to wrap by head around the difference between the two - though it's obvious that adjusting the stop screw can only affect the point at which the turbo vanes start to open (it cannot have an effect if the arm is not in contact with it) - but lengthening the actuator rod can affect boost throughout the range.
Do you have any thoughts on this?
Andrew
Yes. Lengthening the rod on a gt1749v numbs the boost response and gives the ecu alittle more time to catch it. At any point, the vanes are slightly more open than they might have been orignally.
Adjusting the stop screw on a gt2052v only alters the base closed point and the fully open poistion. It does nothing to alter response.
That drop off in airflow at 3200 rpm is most odd...
Was this done while diving or static?
Some information about EGRs and turbos (and other stuff) here
http://users.on.net/~aschulze/ZD30/ZD30 Y61 Reference Document - BW.pdf
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