Got a s13 sr20 with a t3 top mount on 14psi z32 maf recirculated greddy type-s bov greddy style intake manifold arp headstuds and better headgaket 550cc injectors high flow fuel rail 38mm wastegate and 3in downpipe apexi neo and recently tuned up car but recently I started running on 3 cylinder and it seems that cylinder it's getting way to hot and it put a big crack in the coil pack and melted another anybody got any ideas thank you

 

You could start by purchasing a real tune. Apexi safc anything is rubbish.

 

whats the plug look like in that cylinder?

 

Well the car is running a lil rich now cuz it needs a retune so there a lil black but there brand new Ngk iridium number 7 plugs

 

the only thing i've seen cause cop's to melt, is extreme engine temp (major overheating), or internally shorted coil shorting through its own body/insulation (usually due to a crack or defect). the spark is going to find the shortest way to a good ground, if thats through a crack in the side of the coil thats where it will jump. check for white residue on the body of the coil (indicating a shorted coil).

 

well i had splitfire coils packs on it and the top of #3 coil metlted then i put the stock coils back in and it ran fine for a few days then back to the same shit again i pulled #3 coil pack again and there was a big crack in it im trying to find wat would cause this is cuz its getting to much fuel or not enough in the #3 cyliner and causing to run hot than the others

 

I have also seen a case where the engine harness or coilpack harness had rubbed through and grounded out. Instead of getting a signal from the ECU, it was charging the coilpack constantly. This melted the coilpack within 2-3 days.

Check the harness for exposed wires.

 

ok ill check that but the split fire coil pack come with there own harness so i guess you can rule that i still dont get y the split fire melted im just guess a defective coil

 

The split fire harness still plugs into the factory harness right? so if it's getting constant power, and constant ground from a chaffed through factory harness, like epstein said, that would definitely short a coil out pretty quick. Check continuity with power off from the ground wire on the factory harness to a good ground, move it around and see if you get anything.