Weber selection and initial jet tuning

[blodi]

Yeah, that's kind of what I went through back in August.....I had the dizzy installed and bypassed the resistor as instructed...my tach was all bouncy at higher rpm. So I tried hooking the resistor back up and that's when it fried the ignition module on the dizzy.  Maybe I need a different coil? I thought I had the correct ohm version...but now I forget what I have in there.  I'll have to check. 

[siteunseen]

Should be 1.5 for the zx. 

3.0 for the z.

I run a Crane Fireball PS20. Seems perfect for the last 3 or 4 years?

[blodi]

5 hours ago, siteunseen said:

Should be 1.5 for the zx. 

3.0 for the z.

I run a Crane Fireball PS20. Seems perfect for the last 3 or 4 years?

Do you have the ballast resistor hooked up with your setup? 

[siteunseen]

Nope. 

[siteunseen]

Here's mine. If you need more let me know.

And the reason my wires are different colors than the instructions above is I found a ZX in a junkyard. Got the dizzy adapter and about 4ft. of the ZX wiring harness then spliced it into the 240's wires.

 

Edited January 6, 2020 by siteunseen

[blodi]

Happy new year and happy uh quarantine to everyone.  So, I’m trying to figure out my high rpm sputter.  You can see it do it on the dyno video I posted last year.  Tried a new coil, wires, put in a new pertronix...nothing.  Fuel pressure is steady at 4 psi. Pulled the tops off the carbs and everything looks clean. Maybe it’s the plugs?  What plugs/gap should I be running on this setup? Currently running NGK BPR6ES at about .029 gap.  

 

 

[jonbill]

On 7/16/2019 at 8:02 AM, jonbill said:

I used to use a pertronix igniter and it had similar misfire problems over 6k. I'd try a 280zx distributor if you can borrow one from somebody near.

I also tried a new Pertronix igniter.  I concluded they don't do revs. 

[240260280]

It could possibly be a noisy alternator or Vreg exhibiting +12V bus problems at higher rpms.

 

 

[blodi]

22 minutes ago, 240260280 said:

It could possibly be a noisy alternator or Vreg exhibiting +12V bus problems at higher rpms.

 

 

I have the MSA upgraded alternator with the internal voltage regulator.  I guess I could monitor the voltage gauge. 
 

Never had a problem with the pertronix reviving in the past.  She’d gladly run up to redline all day. 
 

Going to order up some new plugs. Is what I currently have good?  

[240260280]

Yes they seem fine for plugs.

You can check ignition in dark to see if wires are arcing.  I had brand new Bosch wires do this on my Rav.... Made in China of course. Some spray salt water mist on wires but that is not nice on a non-beater engine.

 

[blodi]

I put in new plugs and she certainly revs better. But breaks up now at 6k instead of 5k before.  I might try adding timing to see if it has an impact.  

[jonbill]

what sort of spark plug gap are you using? You could try closing them down to 0.6mm.