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Old 05-07-2019, 09:28 PM   #1 (permalink)
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Default Spark plugs for SL-turbo?

Hey guys I was looking for a little input as I’m new to this whole turbo/modding/tuning thing lol. I have a 1996 SL with a turbo in it pushing about 10psi (fantastic drive I must say) and I was wondering what you guys think are my best options as far as spark plugs go. I’m not looking for spark plugs as a way to go faster and stuff, but I’m curious as to what would be healthiest for my engine. Thanks!
PS I’m still on 10:1 compression with 360cc injectors
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Old 05-07-2019, 10:02 PM   #2 (permalink)
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Default Re: Spark plugs for SL-turbo?

I use NGK BP7ES copper for both my SL TT and VR4, works well and are relatively cheap
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Old 05-07-2019, 10:02 PM   #3 (permalink)
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Thanks a lot!
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Old 05-08-2019, 07:18 AM   #4 (permalink)
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Default Re: Spark plugs for SL-turbo?

for 10:1 Turbo cars I always ran one step colder than stock, and always went with a NGK Copper plug.
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Old 05-18-2019, 12:54 AM   #5 (permalink)
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for 10:1 Turbo cars I always ran one step colder than stock, and always went with a NGK Copper plug.
What is the heat rating for the stock SL?
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Old 05-18-2019, 07:00 AM   #6 (permalink)
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Default Re: Spark plugs for SL-turbo?

This link may help.

https://www.stealth316.com/2-sparkplugtech.htm
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Old 05-18-2019, 09:52 AM   #7 (permalink)
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Ahhhhhh got it. Thanks you both!
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Old 05-19-2019, 12:05 PM   #8 (permalink)
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Default Re: Spark plugs for SL-turbo?

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Originally Posted by dfz3000gt View Post
I use NGK BP7ES copper for both my SL TT and VR4, works well and are relatively cheap
That's what I would suggest as well. On gas colder plugs than a 7 series tend to foul if you don't drive the car hard.
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Old 05-19-2019, 12:11 PM   #9 (permalink)
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Originally Posted by dfz3000gt View Post
I use NGK BP7ES copper for both my SL TT and VR4, works well and are relatively cheap
That's what I would suggest as well. On gas colder plugs than a 7 series tend to foul if you don't drive the car hard.
Awesome! I’m getting random/multiple misfire codes and fuel trim codes (misfires on start up due to running super rich on start up oops) and the fuel trims I think are due to a fuel delivery/ignition problem, so I’m planning on going all new fuel system (sans injectors cause I just bought those a year ago) and an ignition tune up and some data logging which I just saw that you posted on my data logging question so I’m gonna scoot over there and check it out. Thank you so much!
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Old 05-19-2019, 01:08 PM   #10 (permalink)
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Default Re: Spark plugs for SL-turbo?

Hopefully some people find this useful:

https://www.rvengeperformance.com/20...commendations/
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