Otodats President

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Otodat
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Re: Otodats President

Postby Otodat » Tue Aug 13, 2019 2:37 pm

Spent quite a bit of time on this to get it running ok. Have come to the conclusion that the injectors I got are perhaps a little large. Got some resistors to try on the temp sensor and found that below 100 ohm the idle becomes more stable.
Image

From there it ran fine until the revs get up higher at full throttle where it would surge badly. Then I added a extra spring to the airflow meter potentiometer which sorted that end.
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So all in all it is driving well and idling ok at the moment. But I was wondering if I got an adjustable fuel regulator and lowered the pressure weather it would come back in spec?

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180bst
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Re: Otodats President

Postby 180bst » Tue Aug 13, 2019 3:25 pm

This is an odd scenario but you may be right. If you have bigger injector nozzles and it would put in more fuel in for the same rate of injector pulse. So the mixture should be too rich and you could compensate with the temp sensor value for match..however its still going to be insuffucient and lowering the fuel pressure will probably cause the injectors to dribble rather than atomize.. anyway you can check your old injector size and compare
1975 610 Sedan VG20ET
1973 610 SSS Coupe
1983 C20 Van
1981 720 Cab Chassis

Otodat
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Posts: 203
Joined: Thu May 26, 2016 7:59 pm
aka: Steve
Location: Otorohanga
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Re: Otodats President

Postby Otodat » Tue Aug 13, 2019 9:33 pm

The new ones are 270cc, I kind of took a punt at the sizing. The old ones didn’t come out easy and of course info on these things is pretty limited.

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DJZ
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Re: Otodats President

Postby DJZ » Wed Aug 14, 2019 6:38 pm

You can adjust the air flow meter, but make sure you mark it before you start.

http://xenonzcar.com/s130/afmrefresh.html
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Otodat
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Re: Otodats President

Postby Otodat » Sun Sep 08, 2019 4:13 pm

Finally got this thing running ok-ish, still needs a little tweaking. Running at 20 psi on the fuel pressure. It’s going for a wof on Tuesday so will play with it over the next couple of weeks all going well. Made a amateur mistake today and hooked the wipers on 180 degrees out - made a slight mess off the paint trying to wipe the bonnet oops!
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180bst
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Re: Otodats President

Postby 180bst » Mon Sep 09, 2019 6:03 am

Awesome work.
Hope the WOF goes through OK.
1975 610 Sedan VG20ET
1973 610 SSS Coupe
1983 C20 Van
1981 720 Cab Chassis

Otodat
Datsun Dreamer
Posts: 203
Joined: Thu May 26, 2016 7:59 pm
aka: Steve
Location: Otorohanga
Contact:

Re: Otodats President

Postby Otodat » Wed Sep 11, 2019 12:06 pm

Couple of things to do for wof- headlight alignment, window washers ( just needed nozzles pointing up higher), and handbrake to work better. All in all pretty good!


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