i believe .024-.025 is the right gapping..

also, u seriously need to get someone's wideband and just street tune it.. u dont really need dyno time if u know someone with a wideband..

oh, and i wouldnt go with ngk 8's.. just go with the bpr7es's (part # 2023 at pep boyz).. that's what AMS uses and i believe most other tuners..

 

i was told by a few people that .044 was the stock factory gap. i even checked the stock plugs on my car and it was at .044. i regaped the 8's to .042. what gap is everyone on here running? this may be my problem.

 

Gap should be between .024-.026 ...not .044 FOR SURE

Check w/ any of the reputable tuners if in doubt.

 

so i could actually be blowing spark out? i wonder why my plugs from the factory were gapped at .044?

 

i gapped the plugs down to .027 and the miss is gone! but it still feels a bit laggy, but its much better than before. also, im having trouble getting it to boost up to 20 psi. i have my greddy e-01 up to 65% and it wont go over 19.4 psi. any ideas?

 

.

 

Mine was at .044......Pep Boys computer also says .044 and you know they are NEVER wrong .......................

 

From NGK's site..........
Cars, Trucks & SUVs

2003 MITSUBISHI EVOLUTION 2.0 L4 EFI TURBO
Spark Plug Part No. Stock No. Plug Gap Photo
OE Laser Iridium IGR7A-G ^ --- .032 n/a

 

Have to remember that our ignition fires 2 plugs at once, so the gap is narrower
than normal.

 

My plugs all measured .024 with no misfire issues ever. Here's pg. 9-6 of the owner's manual for a good mix of the discrepancies stating .024 - .027.