Rb25det Power Troubles

[r32u]

hey having trubles with my rb25det s2

well when i first put engine in my car would drive good but there has always had a very little hisitation from round 5500 to 6500 but hardly noticable

has fmic, exhaust, only ever run 9psi

but then it started backfiring hard between 5-6.5g

i decided to wire up up an ignitor and wasted spark

has new vn coil and leads with 8 months old platniums

checked them and the white ceramic was cracked on one and you could c were it had been arc'n through so replaced with a spare irridium ( if anyone knows wot 45 dollar ones to put in)

know when it gets to round 4500 it just misses/pings, doesn't even rev past 5 easly

it seems to change behaviour(getting worse)

tried changing cas but no change

[PM-R33]

Another wasted spark and leads conversion thread. Why go down this road? It just isn't needed.

Also, mixing spark plugs really isn't a good idea. Is it the exact same plug (gap, tip position, heat range, resistor type) just an iridium version?

Edited June 8, 2009 by PM-R33

[r32u]

they are the same i think, heat range is one diff but woundering if its on the spark or fuel side of things