Only 5psi, And Hosed Direct To Actuator

[bubba]

+1 for collapsed cat

[Galois]

maybe shit in your exhaust. came back to my car the other day to find an empty can of fanta and a popper squashed in my 4.5" tip, was not impressed

[r33canada]

haha yea maybe, my cat is getting removed on friday and im sure my filter could use a wash

[ClutchBurndout-:(]

have an update guys

after fitting my controller i set the boost to 8 psi ish, and now when giving it juice it starts to POP after around 4 or 5k rpm, it feels like it his redline and dosent want to gain anymore rpm and goes pop pop pop pop pop pop untill i back off, the boost dosent creep past 10 psi when this happens so it must be something with the engine, any ideas?

[paulr33]

that sounds like R&R now

are you sure you are setting it to 8psi and not reading 0.8kgcm2 on the stock guage?

0.8kgcm2 or 0.8 bar is very different to 8psi

[ClutchBurndout-:(]

that sounds like R&R now

are you sure you are setting it to 8psi and not reading 0.8kgcm2 on the stock guage?

0.8kgcm2 or 0.8 bar is very different to 8psi

its definatly psi, the guage says psi

would r&r cause it to pop like this though? i thought it would just run slower and richer, this was like crazy popping like the rev limiter but replace the revs with pops, and wouldnt rev more

[paulr33]

nah R&R basically just feels flat and empty

ie all the power drops off but the car keeps going

popping / farting flat out is either

detonation

misfire

detonation is from too much boost, poor spark, poor spark gap, poor fuel, poor timing, poor compression, too high intake temp

misfire is from

poor spark, poor coils, damaged coils, damaged or mangled spark wiring / loom, other electricial issues

[ClutchBurndout-:(]

nah R&R basically just feels flat and empty

ie all the power drops off but the car keeps going

popping / farting flat out is either

detonation

misfire

detonation is from too much boost, poor spark, poor spark gap, poor fuel, poor timing, poor compression, too high intake temp

misfire is from

poor spark, poor coils, damaged coils, damaged or mangled spark wiring / loom, other electricial issues

do you think the above mentioned issues with a cracked coil or to large a gap for plugs would cause this?

[Galois]

do you think the above mentioned issues with a cracked coil or to large a gap for plugs would cause this?

yep, absolutely, it's a really common problem with skylines. the coilpacks often need replacing after 100k km. the popping is prob the misfire, i have the same problem.

try the above methods and see how it goes: reduce gap, tape coilpacks, silicon coilpacks, replace coilpacks (or just skip to that)

[ClutchBurndout-:(]

yep, absolutely, it's a really common problem with skylines. the coilpacks often need replacing after 100k km. the popping is prob the misfire, i have the same problem.

try the above methods and see how it goes: reduce gap, tape coilpacks, silicon coilpacks, replace coilpacks (or just skip to that)

cheers mate, will try them all this weekend and report back, hoping it fixes the issue! i dont mind spending some cash on coilpacks if they need replacing though, if thats whats causing it

cheers

[r33canada]

are you running stock ecu?

if you have full exhaust/ intake then even if you set the boost to 8 it's gonna creep past that no matter what. r33 ecu's are very finicky. so hell maybe its just creeping to 9psi.

that could still cause it to go into r&R.

[ClutchBurndout-:(]

are you running stock ecu?

if you have full exhaust/ intake then even if you set the boost to 8 it's gonna creep past that no matter what. r33 ecu's are very finicky. so hell maybe its just creeping to 9psi.

that could still cause it to go into r&R.

oh, i didnt know that it will creep no matter what with the mods...

i have

3 inch bellmouth, high flow cat, 3.5 inch cat back

normal airbox with k&n filter

fmic

stock ecu (i think, i might have to make sure)

i always thought it was something wrong because, theres a limiter, weather it be the actuator, or the boost controller, that it limits the pressure by releasing the flap, so i just dont understand how it can over pressurize

[TUF250]

Just to add my experience to this, maybe it will help someone or someone can help me.

I have an R33 manual.

- 3inch belmouth dump pipe, xforce cat (dont know how old it is?), 3inch stainless sytem

- Pod filter

- R34 SMIC (cleaned it out as well as the piping.

My car has developed a bit of a flat spot on really cold nights (worse with fog) so its probably getting to R&R point.

Interestingly my boost gauge (psi) only reads 7max! according to everyone i should be getting more than that?

thoughts?

[jrm]

Is that an aftermarket gauge? Cos +7 on the standard gauge is 14psi (1bar) ...

Either way, could still be plugs/coils breaking down (as above) ...

[TUF250]

yeah aftermarket gauge in psi.

changing the plugs to coppers with 0.8mm gap and 6 heat range this week. checked coils at night, no missfire at all