Why do you say the stock ignition sucks? I have seen Evos put down 475 whp on watered down 91 oct on totally stoc ignition including stockplugs. Seems to me the stock ignition is pretty good.

 

ptevo03 made 499 on buschurs heartbreak dyno with stock coils!!! I guess they still suck!!!!!

 

Try this:

Warm engine, put a fresh set of copper plugs in, start car and immediately run a long pull, cut ignition soon after redline. Before starting again, pull the spark plugs, put originals back in to go home.

You will definately see a lean cyl by plug appearance if done this way

 

what will they look like?

 

Thanks for being a smartass, its appreciated. Evo coils do suck. Archaic old school DSM's lay down 650 and better on stock ratty *** 20 year old coils. If you have spent any amount of time in the evo world you will see the amount of guys that have to gap down their plugs to make clean pulls. You should be able to run proper gap (32 thousandths on NGK coppers). Anyways hp and ignition power isn't a good correlation. Cylinder pressure with respect to gap is. Torque is an OK approximation to use for cylinder pressure as well as boost. Inductive ignitions suffer with increased engine RPM's so that is another factor to worry about.

If evo coils were great then people like spark tech wouldn't sell as many units as they do.

 

 

Trims would not stay consistent and I experienced intermittent idle problems,intermittent AFR's ,and the car would run good but never felt "Right" .

The idle was not as smooth as I'd like it to be even when turned up to 900

The only way I truly knew was when I swapped my perceived faulty set of injectors out for a different set and the second set acted proper and I could scale them right in. I then sent my first set in for flow testing and was told 2 were good and 2 were bad or out of spec from the others.

Oh it is important to note that I was getting p0300 series errors either pinpointing cylinder 4 or random misfire as well. I could go 2 weeks between cel codes or even 2 months but in the end it turned out to be the injectors. I personally would swap plugs and gap down a little and see how she behaves as stated earlier.

 

I don't know. But if one appears srtikingly different than the rest there is something going on. People still use this technique. Even with gas benches or multiple cyl LC1's, at the end of the day they're still looking at the spark plugs for answers.

 

I was plagued with P0304. I attributed it to injectors, especially since my LTFT was pegged at +12.5%. Fuel in my oil from a UOA pointed even more towards a leaky injector. Got new injectors, swapped them in, and still had the stuttering at peak TQ(but not the P0304 code, strangely enough). Took the plugs out and gapped them down and all was well.

 

nah plugs were ok. I tried to gap them down to .5mm but they wouldn't bend real easy so they are probably at .55mm..