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iTrader: (1)

I have a nitrous outlet 92 mm plate. Works great, very happy so far. I'm only spraying 100 right now. The plugs look as if the timing mark is way past the bend with a few plugs. Others look as if the mark is barely started on the strap, lots of room to go before it reaches the bend. Now these plugs weren't fresh right before this 1/8 pass I made on the street. Also, had several miles driving home before I got to check them. I'm planning to go to the track asap and swap in 8 fresh plugs and go make a nitrous pass then check plugs immediately at the end of the track. I want to get this figured out asap I want to spray 150 and the ln 175.

Pulling 7 degess at 100 hit (more than enough)
Walboro 255, hot wire kit, 42# injectors, using a 24 fuel jet
BR7EF plugs at .029-.030






Same plug as above, from #5 hole, mark in relationship to the bend looks like it's too hot





This one seems way on the cold side... from #1




Same plug as above, just cleaned off..




From #2





Same one as above, just cleaned off. This really has me puzzled. Seems to be 2 marks? One color change before the bend and then another past the bend? Am I over thinking this stuff? I don't doing mind extra work just want to know I'm keeping my motor safe.

NitroPanda

I would recommend going with a fresh set of plugs and make your pull on them and shut the motor down after the end of the run. You do not want any idle time or drive time on them. What kind of fuel are you running 93 octane? What are your details of your build? Heads,Cam,Intake? Also what compression are you running in your build? What is your overall timing set at your pulling 7* of timing from what starting point?

b0b

iTrader: (1)

Basic heads cam intake.
Ported 799s, only milled for cleanup, 62-63cc, not much more than stock compression
GM MLS gaskets .051
227/235 .620/.610 110+3
Total timing was 25@5000 and 27@6500, before pulling any
Fast 92/92
1 7/8 lts, x pipe tds
93 octane, just pulling from the rail, nothing else
Recently did a t56 to 80e swap fwiw




Top 2 are motor with converter locked and unlocked, 3rd one down is 100, bottom is 150

maroon88iroc

do you have hptuners? was the tuner monitoring for KR during the pulls. 7 seems like too much even for a 150 shot. pulling 7 degrees for a 100 shot is leaving a lot on the table..

I know most like to read plugs but I put a 150 shot on my 02 Z06 with a similar timing curve to you (25 at 5K 27 at 6500) I pulled 6 degrees from 3K rpm to 7k rpm and had the window switch to engage the spray from 3K-7K and had no KR. Next time out I will be pulling plugs to see how they look as I add timing back in..