I want to point out that though you might not feel spark blowout, it starts happening before you feel it.
My 516whp pull was made after we noticed a very jagged hp line. I went from .032 to .025 (to not waste time on the dyno) and it pulled smooth. I didnt feel any blowout. I currently am running a .032 on my junkyard motor and 24psi = scary spark blowout that makes you think the engine blew up.
My guess is that it was blowing out at less boost but I couldnt feel it.
And holy crap, I posted this in the wrong "old" thread :P
__________________
Brent
1992 Duster 11.54@125 22psi BONE Stock 6g72 12 valve - 12.7@114 14psi boost -516whp 519ft/lb 20psi (Old 3.13L built shortblock) - Precision 6765, Tial 38mm open dump, 3" open downpipe, 20x12x3" evo style intercooler, Stock 10:1 diamante 12 valve shortblock with regapped rings. heavily ported heads (+40% on flowbench), Ferrea Competition Plus +2 +1 stainless valves, Nielson Vintage Racing 278 custom turbo cams, RPW cam gears, Custom Ram Style short runner intake manifold, 12 Gal Jaz Fuel Cell, Dual external Walbro GSL392 255HPs, Dual 5/16" feed lines, Trick Flow AFPR, 3 puck solid hub & 3300# DD plate, OBX Torsional Diff, Zeitronix wideband/EGT/Boost, 2100cc 3 nozzle DevilsOwn Meth. Running on 4.0 BAR Megasquirt II, 47# Inj, E70 Fuel
1994 Spirit - 13.987@101.89 - 5psi- 6g72 SOHC, K27 Turbo
I'm running a stock TT conversion at 6 psi on NGK coppers BCP7ES, so they are the correct heat range. What gap are you guys running? I'm running the gap specified in the manual : .040. I'm getting a lot of knock under boost and suspect that this may be due to my spark plug gap as some helpful people have pointed out in another thread.
Any help is appreciated.
Actually 6 are the proper heat range. You bump up one range colder for every 75-125hp. You are not there. So you should use 6's.
At 6psi there is no reason, except weak ignition parts, that you can't run 32 gap or even larger. Even 40 shouldn't be an issue at 6psi.
-Chris
__________________
AEM Factory Trained Tuner
91VR4-3.0L-Stock heads and Cams-770AWHP 747AWTQ 30psi E100 Daily Driver 10.57@136mph
SLTT-10.9 @ 140MPH Stock NA motor and NA heads/Cams
T4 AWD 9.21 @ 154.98
T2 FWD 10.19 @ 140.31
T4-159.23 MPH Ran on 6G72 3.1L!
T4-995AWHP Uncorrected 6G72 3.0L C16
T2-820FWHP 3.1L 27psi C16
Excuse me for butting in on the conversation but since the topic is spark plugs I was just curious what are the symptoms of bad gapped plugs like too high or too low, I don't own a TT its just NA but I have iridium IX's with a few mods on the engine. The manual says .039-.043 but when is it ok to make the gap less or higher?
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Re: Help me with spark plug gap
me too 
