Tripple Weber Hepl in Indiana

[dat240z71]

I'm in need of someone that knows how to tune webers.I have a L28.20 over Ported and polished N42 head,Robello street cam.flat top piston 280zx distributor that I can't seam to get running correctly.  The car has a slight bog at 2800 RPM. Bseam to hit a wall at 4k RPMS. My trimming is set to 20 degrees at idle vacuum advance disconnected.  Distributor have not been re curved.  Driving at highway speeds the car seams to bog when press down on the accelerator. The transition isn't smooth from idle circuit to main. If there anyone or a shop in N.E Indiana or the surrounding area that can help I will greatly appreciate it. I'm also willing to Compensate you.

Jetting

Idle jet 60 F9

Main jet 135

Air corrector 180

Emulsion tube F2

Pump jet 45

34mm Choke 

Edited September 1, 2017 by dat240z71

[240260280]

There is a current thread on tuning DCOE's on L28.  It may be helpful.

 

Do you have 40's or 45's?

Please measure your fuel height in all 3 carbs and make sure your linkage is synchronized.

 

[240260280]

Check this thread http://www.classiczcars.com/topic/56375-weber-selection-and-initial-jet-tuning/

[dat240z71]

They  are 45's

[Patcon]

Do you have an O2 sensor or wideband set up? That would help a lot!

[dat240z71]

Just went out and looked at the carburetors after reading the post suggested. My throttle plate sits behind the 1st progression holes I'm going to adjust them as per the pictures will report back in a little bit what I found 

Edited September 2, 2017 by dat240z71

[dat240z71]

I set the plat at the edge of the progression holes can't get the idle under 1500 RPMS at that setting . No ai don't have an 02 sensor no a wideband 

Edited September 1, 2017 by dat240z71

[240260280]

plate should be as closed as possible.  At first progression hole or closed even more is best.

 

 

 

[dat240z71]

I will go out today and play with the car and report back. One question I do have is do you guys think the problem I'm having in the high rpm range could be timing  related. I do not have a digital readout timing light so I have set my idle at 20ﾟ but I have no idea what my total timing is do I need to look into that 1st. 

[240260280]

Yes, 20 at idle is most likely too high. It depends on what distributor you have.

You need to buy a timing light (preferably one with advance) to measure your timing at different rpms.  The max timing you want is ~ 36 to 38 at 3000 rpm or above.

 

 

[dat240z71]

I have1979 280x distributor it haven't been re curved.  Vacuum advance disconnect.  When I get the new timing light do I want to set total advance. 

[240260280]

I checked specs and all 280zx distributors gives 17 degrees of mechanical advance.  If you put 20 degrees of initial advance in then you are 37 total so it would be in the ball park.

 

Too much advance under load at higher rpms will reduce power and may ping.