Hi, I'm putting my 1976 280 back together after (shamefully) letting her sit for 5 years unpreped. It wasnt my intention to go for so long however, life got in the way as it sometimes does. I was wondering if anyone could please help me on the huge anxiety I am having on just getting my spark plugs. I have a turbo on the car plus she is stroked and has a bore of .90 over. I believe because of the turbo alone shouldn't it be 1° cooler? I don't know if the other mods would play in that as well. I think stock was like BP6ES? But I don't know if that would be safe to use. Any help I'd appreciate it. 

  On 1/13/2016 at 11:10 PM, CKelley said:

 

Never mind.

Edited January 14, 20169 yr by Zed Head

Cute. How very cute. The reason I was unsure about the plugs was because the male at the local parts store wouldn't sell me the ones I had wanted. He made a big deal out of it. This made me worry, and I figured I'd ask online today. So thanks. Anyway.

  On 1/13/2016 at 11:10 PM, CKelley said:

 

They really weren't that bad...

Edited January 14, 20169 yr by Zed Head
mellowed out, even more

Do over.

Edited January 14, 20169 yr by Zed Head

  On 1/14/2016 at 12:27 AM, Zed Head said:

And you didn't answer any of the important questions.  You need to know what you're dealing with, especially with an L6 turbo.  Make a mistake and the head gasket blows pretty quick.

Have you had a bad day Zed?  This isn't zcars.com

I appreciate your help but come on now.

I was fixing it while you posted.  I fixed the bad one.

Edited January 14, 20169 yr by Zed Head

Alright site, you made me feel bad.  Removing all of my comments, useful and otherwise.  He/she can start anew.

Edited January 14, 20169 yr by Zed Head

The stroke and Bore won't change spark plug heat range much . But the Turbo sure as heck will. ( Stock Heat range is a 6. 7's are one range colder )

Go to BPR7ES at .028 to .030 for up to 8 to 10 lbs boost. Over 10 lbs boost use BPR8ES... but you'll need a better than stock Trignition system to keep the plugs clean with 8's. 280ZX matchbox will have enough grunt to 18 psi ( Gap at .026" ) as will a Crane Hi-6 CDI or MSD . Or GM LS-2 Yukon COP.

You should have a Wide Band AFR meter in that car. You don't want to run lean with a Turbo. How much boost you pulling. What's the Compression ratio and what sort of Tune/ECU Fuel system do you have? 

Please tell us more about the motor specs. If you don't have a WB AFR meter on the car, put on on. And keep the boost low, timing conservative and the best darned Pump Fuel that you can find. 93 or 94 Octane minimum. For Turbo engines 10% Ethanol in fuel is good. Knocks down combustion temps but does not require a re-tune. E85 on Turbo engines is awesome, but you need way bigger injectors and an E85 tune to go with it. And that means a stand alone ECU like Megasquirt, AEM or Haltec.

( DD since 2006 is an Audi A4 Quattro with APR 93 Octane tune and pushing 18 lbs daily . Still on original Turbo and engine at 250,000 KM)

Edit: And run a 160 F thermostat. Important for Turbo cars in Hot Climates. Especially L series motors. Reduces chance of detonation.

 

 

 

Edited January 14, 20169 yr by Chickenman