Zed Head

That's not spec. There's no rabbit hole here. I'm sure it will work just fine. I'm just going by the words people write.

Funny (maybe) aside - I came across a site apparently in the United Arab Emirates. "Desertcart". https://www.desertcart.ae/products/253969950-ngk-u1099-48776-canister-oil-filled-coil

He just wants to use the factory specification from the FSM. The other thread ended without verification of primary circuit resistance for the NGK coil. There's no information out there, ironically. But, a quick check with a meter should answer the question since you have one in hand. Trust but verify. Another option would be to use a ballast resistor in circuit with the Jacobs coil. ~ 0.4 ohms. There's one for a few Mercedes models that appears to be about right. Probably don't want OEM though. Yikes. https://www.authenticclassics.com/Beru-0-4-Ohm-Blue-Ballast-Resistor-for-Mercedes-p/auth-006506.htm

kcpope had a similar problem. About 4/5th's down this page - https://www.classiczcars.com/forums/topic/69986-picked-up-a-78-280z-today-pros-cons-with-some-pics/page/7/#comment-686577

Makes sense. I think that they advertise it as an addition or as a standalone. Seems odd that the user would need to choose though. Maybe they knew it was failure-prone, and provided a switch so customers wouldn't get stranded. Or for the people nervous about new technology. p.s. without the AI sources linked the results can't be trusted. What you found seems reasonable but...it's AI. Could be a hallucination or rationalization.

Maybe a local parts store has a loaner. If the FPR is really giving that pressure it seems like you'd be running pretty rich. Which might be why your intake vacuum readings are low. But you should be smelling gas in the exhaust, and getting dark plugs.

The fact that the pressure drops to 34 with vacuum on the FPR shows that the pump and fuel path can go lower. If I was ZCD I'd demand that you try a different gauge before refunding. You can't just go off of a company's reputation. Stuff happens.

No picture. I'd still check with a different gauge. In today's world anything can be of poor quality or counterfeit. Damaged in shipping. Who knows. Everything needs to be checked. Even a cheap parts store gauge might tell you something. If it reads 41 also, that's a sign.

Never heard of WebTV. Interesting. I think we were still watching MTV on cable back then. https://en.wikipedia.org/wiki/MSN_TV

A 7 psi drop under vacuum is pretty good. That would be 29 psi if the FPR was calibrated correctly. Are you sure of your gauge? Hope you didn't get caught with poor aftermarket quality. I would make sure the gauge is reading correctly, then send it back to ZCD if you're really getting 41. 41 is way out of spec. ZCD needs to know if they're selling crap parts. Good luck. p.s. the guy that started ZCD is a member here. Maybe somebody can @ him if they know his screen name. @zcardepot.com found it!

What is the starting pressure, non-running?

So close Mister Bot, so close. Keep at it! 🦾🤖

Looks like they wanted to restrict current through the coil during operation but weren't too worried about the sensor and module under the cap. Seems odd, but it was early days for electronic ignition. The coil primary resistance isn't that low. One of the ironies of restricting current through a "high performance" coil is that it reduces performance. You can spend the time to get it like they wanted it to be but the reality is it's old electronics. That's probably why it's overheating. Starting to fail. Either the coil or the module. Most likely the module. https://www.jalopyjournal.com/forum/threads/what-was-the-first-year-of-the-sbc-bbc-mallory-unilite.839756/ https://www.summitracing.com/parts/maa-29440 Summit Racing Part Number: MAA-29440 UPC: 085132294404 Coil Style: Remote mount Primary Resistance: 0.600 ohms

I'm still in the "reject all AI" phase. Can't do it!

Thanks for the reply. It kind of boils down to the difference between having a private discussion versus having a public conversation. I'm here for the public conversation. I think that we're all here to talk about interesting things. No reason for secrecy, we're not competing. No obvious reason for S30.world to want to keep things private. They put a lot of effort in to the very public web page. I was just pointing out some deficiencies, questions that people might have. You raised a few yourself.