Neo Rb25 Flame Problem

[sinister_rb_s14]

hi

i have a neo rb25 in my s14 and its starting to missfire just a little bit on idle and when i back off the throttle it gargles and backfires a bit and my mate said when i over took him the other day it was launching flames the size of my boot and held the flames for like 3 - 4 seconds and when i was coming into an intersection it was flaming out the exhaust constantly.

and now the battery is starting to die or the alternater coz if i drive it it starts on 14.3 and then when i drive it for like 20 mins its down to 14.0 turn it off for the day it goes down to 12.8 and by the time i want to start it again later that day the battery dies

is that an alternater problem or the battery and could this be the reason why my cars acting strange launching flames and missfiring coz it never used to do this until about a week ago it drives awesome and doesnt missfire when im driving it and its going better than eva. I changed the spark plugs about 2000kms ago

the mods on the engine are a

bosch 040

kkr 480 turbo

front mount

air filter

3 inch exhaust

and a stock tune which is gna get remaped in the next couple of weeks

if any one could help me out that would be awesome

thanx patrick

Edited October 25, 2010 by sinister_rb_s14

[R31Nismoid]

The car is spitting flames because you are running a larger turbo, no tune... silly business.

Until you have a tune then its really going to be hard to tell

[TM7GTR]

Not sure if i can help you at all here, but i have a friend with a r33 and the way his car is tuned allows flames to be shot out of the back during hard driving, i.e. under high revs (burning off excess fuel?) so maybe remapping your ecu will fix it. Do you drive your car hard? and as for the battery it sounds like your altinator is faulty atm. Most cars running an rb25 backfire and gargle a bit anyways as you let off the throttle(my r34 is running perfect and i actually like the gargle/popping noise it makes; this could just be due to the HKS exhaust tho) I have also heard that if you are running boost that is a bit higher than factory it makes the car backfire anyway. As long as it is backfiring as you let off the throttle only (not as you put your foot down), it should be fine (my bro's s15 is running 14psi and backfires quite regularly as he lets off the accelerator). Not sure if this is of any help lol, but i suppose an opinion never hurts

[sinister_rb_s14]

yeh it doesnt missfire when im driving/reving it at all it actually goes a bit harder now than it used to i just thought it might of been a bad thing ill have to get it tuned asap

i was wanting to high mount it first and make it external gate and get a greddy inlet manifold before hand and i still might ill just have to do it quick

luky i have a spare alternater i might try and swap it and c if that fixes it

i put tha battery on to chage and within 1 hour it was fully charged it said so its not tha battery

thanx heaps for your advice

[Hanaldo]

Electrical problem doesn't sound like your alternator. Alternator is charging fine anywhere from 13.8-14.5v, so you've got no problem there. If the battery is dying after you turn your car off, I would be checking that there is nothing draining your battery. My money is on your battery being shot.

Also, don't always trust tests on a battery saying they are fine, it is quite common that the battery is shot and the test gets it wrong.