45 DCOE baseline setup and tune

[BatmansDatsun]

Hey Guys

 

Well I have decided to keep the Z and throw more money into it

 

I have a set of 45 DCOE's (152g) coming from down south and need help with the setup and tune. From what I gather the factory weber jetting is pretty close to what it should be.

 

I have been told that they are as following.

 

Emulsion Tube : F16

Choke              : 36mm

Main Jet          : 145

Air Corrector    : 155

Idle Jet            : 55F8

Pump Jet        : 45

 

Whats the best starting setup bet for a close to stock motor with a fresh rebuild and shaved head running 2.5 extractors to a 2.5 exhaust.

 

Thanks Guys

[Roady]

Hey mate,

 

The set up I am running works ok for me. 

 

I have 45mm using 36 chokes on an L28

 

I can't remember the exact jetting mine came with but it sounds very similar to yours and I found it to be way to lean!

 

Tried richening the main jets increasing accelerator pump jet size as well.  Worked well but as I'm using a 72 degree cam it left a gap in power down low which I wasn't happy with, which I then tried to overcome it with the idle jets but still to lean. 

 

So change the emulsion tube and started over.

 

Current setting is:

 

Idle Jet - 65F9

Air Corrector Jet - 210

Main Jet - 140

Accelerator Pump Jet - 60

Accelerator pump exhaust valve -00

Emulsion Tube - F7

 

This emulsion tube richened the overall mixture which meant I had to lean out the main jets and air corrector.  The idle jet is very rich but has overcome the gap in the progression circuit (the cross over between idle and main jets) as you accelerate. 

 

Hope this helps. 

[d3c0y]

By the time you've bought all the wrong jets and found the right ones, you will probably wayy better off to take it to CNJ motorsport (they're even in underwood) and pick it up fully dyno tuned ready to go. These guys will get it spot on for you and you wont have to by a ton of jets to try and guess where it should be at.

 

 

That's what i do anyway.

[dat2kman]

Roady, your's are the later Spanish made Webers, going by what is fitted, and the minor issues.

Batman, you'll need bigger Airs, 45f9 idles, and maybe a change of Emuls tubes depending on where it stumbles, due to camshaft timing.

 

Wide band O2 4 wire and instantaneous digital readout helps, along with a bit of uphill roadway, as flat road/no load is useless.