×

Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

Spark plug reading/opinion please

General Tuning Discussion

Forum Posts

Courses

Blog

Tech Articles

Discuss all things tuning in this section. News, products, problems and results. 

= Resolved threads

Author
305 Views

Hey everyone, just wanted to get some insights and see what these plugs say. AFRs were pretty decent, a little rich on some pulls, especially when TC was pulling 14° before correcting that.

10:1 LS, 94mm turbo, pump ethanol

Plugs were gapped to .20

Attached Files

If you're trying to read plugs to need to start with new plugs before a pull and remove them with as little idle and drive time as possible, IMO these have too many miles on them to get any real read

Oooh I thought you wanted to have done a WOT with them as well. These were put in before the dyno session and now checking them after

The disccoloration of the ground- electrode almost reaches the body of the spark plug. Personally, I would like to see it a bit higher up, hence one, or two, range colder for a test.

If you are trying to read plugs at a dyno you should have the car at full operational temperature and ready to do a pull, swap in fresh plugs, carry out a full WOT pull and then shut the engine off and pull the plugs.

Could you give us some information on the engine/fuel/ tune? and which plugs you're using

10:1 LS

FT550 system

Lambda read at .83

FIC2200, pump e85 (approx. 82%)

NGK 2669 BKR9EIX gapped to 0.20 / OE GM coilpacks

Only went up to 16° and 17psi. Stopped adding timing because car was spinning on the dyno and didn't have anything to help weigh it down

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?