s14 rb25det still not running correct.

[gsn0526]

95 s14 se with rb25det s1...stock....fmic, walbro, new nismo fpr, brand new ngk plugs....when i step on the throttle and i get into higher rpms it starts to back fire. it wont do it at half throttle as fast as it will a full throttle. dont know where else to go with it...thought it was boost leak..got new piping. thought walbro was to strong for the fpr...got the nismo. replaced the plugs last night with ngk platinum lasers

[Sileighty_85]

How much boost and what gap did you set the SP to?

[gsn0526]

stock boost.... at 1.1 mm i read that is stock gap...

[Sileighty_85]

wow 1.1mm as in .045 inch???

Thats way too high!

lower them to .026 or .028 inches

[gsn0526]

ok...will do...i bought plugs for a twin turbo z32 i shouldnt have a problem with that right?

[Sileighty_85]

ok...will do...i bought plugs for a twin turbo z32 i shouldnt have a problem with that right?

Nah but you'll want a heat range of at least a 6.

[gsn0526]

havent had time to do the plug gap yet but did notice that i dont have a ground wire on the exhaust manifold bolted to the body or any type of ground could something so small be causing this problem? if so y? just trying to learn all that i can about this engine!

[gsn0526]

bolted the ground down and changed the gap on the plugs...car runs alot better...thanks guys

[sidewayz240sxtroy]

An extra ground can never hurt.