Jump to content
SAU Community

sick .. !!

OMRAN

By OMRAN,
in Engines & Forced Induction

 Share

Recommended Posts

OMRAN Collaborator

OMRAN

Posted
Posted

i'v posted thread befor about the coils

missfiring @ idle

i use to have it mostly when the car is cold ..

i'v changed the places of the coils ... mmm feel some diffrent .. ( dont know why )

now it miss fire lil bet ... but .. mostly .. it like losing power btween 4500 tell 5800 exactly .. only between those rev its not accelerating like it should ... after 5800 rev . it go's ok ... tell it reach 7000 ... every time it did the same .. in all gears .. (didnt try 5th gear) and by the way .. it happen some times .. some times it not ... i mean after driving for some time .. this gos off

any way

100% misfiring at idle .. but not sure if it misfire at 4500 .... (i think its somthing else)

so .. the Q is .. ?

why its only loosing power at 4500 to 5800 every time ????

is there anything special happen between those rev's ??

i really feel sick already :throwup:

plzzz help

if they r the coils that would be easy to fix ..

mod: hks filter only

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
My friends car misfired between 4000rpm and 6500rpm because the spark plugs where gapped to high, we gapped them down and it was all good. Maybe check your plugs first.

...thanx for replying mate ....

i already did that ..

gap = 0.8

NGKplug IR laser iredum

heat range 6

i'v also tryed NGK R iredum

heat range 5

also did compretion ratio at home ..... its ok... lil diffrent in some of them .. (not a big deal tho)

some pic

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-945623
Share on other sites
Zahos Mentor

Zahos

Posted
Posted
why its only loosing power at 4500 to 5800  every time ????

is there anything special happen between those rev's ??

mod: hks filter only

Considering your mods, that is quite strange.

With most RB25DET's running higher than stock boost, the reason there is a flat spot in this rev range is b/c of the A/F ratio's getting very rich. Timing is also retarded at this point. If your coils have any fractures in the casing, it will also misfire.

Best solution is aftermarket management or a SAFC to correct the fule mixtures.

There are quite a few threads covering this topic, search around and you will find a few solutions that have worked for others in the past...

Zahos

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-945658
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
Considering your mods, that is quite strange.

With most RB25DET's running higher than stock boost, the reason there is a flat spot in this rev range is b/c of the A/F ratio's getting very rich. Timing is also retarded at this point. If your coils have any fractures in the casing, it will also misfire.

 

Best solution is aftermarket management or a SAFC to correct the fule mixtures.

 

There are quite a few threads covering this topic, search around and you will find a few solutions that have worked for others in the past...

 

Zahos

thnx mate .. that makes me happy ..(coz i wanna belive that its only the coil :D )... if its only coils that would be ok .. i'll change the coils next month ... split fire coils or should i go for those kind of coils which comes away from the engin (check pic)

and going for powerFC soon ,.

if any one else have any other thoughts ... iwould like to know more ... thanxx guys ..

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-945701
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
or it could be anything, some one correct me if im wrong.

steve

mm .. the problem is that it comes and gos ..

so .. still not sure .... but 100% i'd go for new coils ... but no one answered my Q .. ?!

do i go for split fire coils ....

or i go for this coils which come alone away from the plugs ... the one on the pic .. i posted befor ...

thanx

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-950522
Share on other sites
knore Grand Master

knore

Posted
Posted

why are they 2 different spark plugs?

One is NGK IR, the other is just R. I would definately replace those plugs just from the look of them.

Gapping iridiums is ok, you just have to be carefull. The most important part is the tip, the rest is fairly durable.

Also, how tight have u put the spark plugs in?

Try insulating the coils with electrical tape aswell

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-951203
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
I would recomend the coils that are on the firewall (the ones in your pic) as the skyline coils are prone to failure as they get so hot!

i like that idea .... but .. do u know any good coils which is ok for the r34 .. and what convertion do i have to do to the ignition wireing .. ??

that would be a good info .. :)

thnx

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-951432
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
why are they 2 different spark plugs?  

One is NGK IR, the other is just R. I would definately replace those plugs just from the look of them.

Gapping iridiums is ok, you just have to be carefull. The most important part is the tip, the rest is fairly durable.

Also, how tight have u put the spark plugs in?

Try insulating the coils with electrical tape aswell

i know ... i did test the NGK R 1st ... then i'v checked the NGK IR ..

i will change them also .. while changing the coils .. ..

any info about the coils in the pic .... :) .. ?!

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-951436
Share on other sites
OMRAN Collaborator

OMRAN

Posted
  • Author
Posted
why are they 2 different spark plugs?  

One is NGK IR, the other is just R. I would definately replace those plugs just from the look of them.

Gapping iridiums is ok, you just have to be carefull. The most important part is the tip, the rest is fairly durable.

Also, how tight have u put the spark plugs in?

Try insulating the coils with electrical tape aswell

i know ... i did test the NGK R 1st ... then i'v checked the NGK IR ..

i will change them also .. while changing the coils .. ..

i dont know ... exactly ... but 100% not too tight ... i can open them and close them easly .. but i know they r not lose ..

any info about the coils in the pic .... :) .. ?!

Link to comment
https://www.sau.com.au/forums/topic/46618-sick/#findComment-951440
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Latest Posts

    • Dose Pipe Sutututu
      What brakes on R34 GTT(Europe)

      By Dose Pipe Sutututu · Posted

      Pads for R32 GTS-t, R32 GT-R non V-Spec (Sumitomo), R33 GTS-t and R34 GT-t are all interchangeable. R34 GT uses a 2x piston caliper, hence it didn't fit.
    • soviet_merlin
      WGNC34 - floor mats

      By soviet_merlin · Posted

      Checked with amayama and nope, the full S2 manual set is not available anymore. Unsurprising, but still disappointing as the ? on availability gave a glimmer of hope.
    • joshuaho96
      Tomei gasket

      By joshuaho96 · Posted

      I've heard the Tomei USA head gaskets are decent if you want to o-ring the heads but otherwise not recommended.
    • GTSBoy
      What brakes on R34 GTT(Europe)

      By GTSBoy · Posted

      The 296mm rotors are the R33 turbo brakes. The 310mm rotors are the R34 turbo brakes. The calipers are nearly the same, but not. They're the same caliper but the R34 caliper has longer legs so that it sits out far enough to go over the rotor. The pads are the same for both. When you say, "I bough tsome EBC"....did you just mean pads? Or rotors? 310mm rotors fit under 17" wheels. There may be some wheels without enough clearance though. I can't fit my fingers between the barrel of my wheel and the "corners" of my R34 calipers, but there is plenty of room behind the spokes. This is on Enkei RPF1. You can fit 324mm rotors inside a 17" wheel, but I'd be willing to bet that it would be close to impossible with the Nissan/Sumitomo caliper (using an adapter, of course), because the Sumitomo caliper is fatter than the Brembo caliper that is supposed to go on the 324mm rotors.
    • Kapr
      What brakes on R34 GTT(Europe)

      By Kapr · Posted

      Hi. Can someone tell me what brakes(and mainly WHERE) can i buy brakes on R34 GTT? I bought some EBC which SHOULD go on my car(i have GT but it has GTT brakes) but it does not fit, Brakes are "too" small(296mm) Are 310mm be good or? I have 17 inch wheel so no "big boys" but for me driving i just need one that fits and i can get here in EU/Czech.
×
×
  • Create New...