94_soarer

iTrader: (8)

Well guys i live in florida where its usually hot but lately we have been having this beautiful weather...55 degrees in the mid day...this is perfect turbo weather but for some reason my 1J decided it didnt like it at all...

My SC300 is a 1JZ Bpu
-FMIC
-3" DP
-Full 3" Exhaust (Blitz Nur Spec)
-Intake
-Greddy BCC
-Greddy SCC
-*I no longer have the safc2* in my car

my car is making about 15psi of boost, anyway about 2 or 3 weeks ago..we got cold weather and my 1J started breaking up at 4K if i was WOT before 4K..i figured it was jus my plugs since i was ridding around on the JDM plugs still so i replaced them with NGK V-Power plugs, it worked great for a day then i had to regap the plus to .28, since then the car has been running perfect, im guessing cuz it got warmer again but now we are having 50 degree weather again and now the car is breaking up again...

Im not sure what to do..

here are the plugs i used...http://www.ngksparkplugs.com/product...ugs/vpower.asp

but i think ima jus go get denso oem plugs n see if that helps

94_soarer

iTrader: (8)

So ain't nobody tryin to help a brotha out....
Come on 1JZ guru's

BigManne

iTrader: (3)

have you been watching the boost gauge every time you drive?

94_soarer

iTrader: (8)

Yes I have, the car drives perfect still...it jus breaks up alil under boost

t70 supra

iTrader: (-4)

Spark Plugs (BPU): NGK BKR7E or BKR7E1

try these i have read some stuff about how the gapping could be off minor and cause problems

94_soarer

iTrader: (8)

incase u didnt read bro..i jus replaced my plugs 2 weeks ago and then regapped them lastweek...they were pregapped at .34 and i gapped them to .28 last week

stockhatch

iTrader: (12)

Man, at 15 psi are you sure you aren't leaning out? Sounds like fuel cut, but the BCC should be preventing that... Do you have a functioning check engine light? Only reason I ask is because I had my car set at about 14PSI, but it got cold recently and I hit fuel cut yesterday. I had to dial the boost back down a bit.

cartmill

iTrader: (3)

turn the boost down and i bet it stops cutting out.

94_soarer

iTrader: (8)

Yes my cel works properly, but I have no cels so I kno its not boost cut/fuel cut,besides the bcc is proventing it from hittin boost cut/fuel cut, I kno exactly what it feels like to hit boost cut becuz I was hitting it before I wired in my bcc & scc..
I'm not sure if the car is leaning out or not cuz I don't have a wb in the car at the moment...but seems alil rich to me jus by the smell

Well I kno that but the issue is I don't have a boost controller on my car...lmao my car is makein that much boost with jus the fmic,dp,exhaust, & intake, I have a hks evc 5 sittin here ready to b wired in my sc so maybe ill use wire it in and go from there
im

stockhatch

iTrader: (12)

I would be concerned about fueling if I were you. Spend the 50-75 on a dyno pull or the 200 on a WB before it's too late man. You have so much work in the car it would be tragic to lose it now due to bad/no tune.

Besides, a WB or dyno pull will help diagnosis of your issue whether it implicates, or exonerates fuel problems.

94_soarer

iTrader: (8)

You are absolutely correct, what's funny is I was supposed to get my car dyno'd yesterday to see where it was at and get afr's but decided not to cuz I don't have anything to tune with atm...no safc2,no wb,no fuel pressure regulator..so I didn't wanna spend $125 for a 1hr of doing pulls I decided ima wait until we have a dyno day then put my car on there,

Besides, I jus bought a safc2, and ima by my innovate LC-1 wb next check...better safe then sorry bro

Ohh and I took the car for a spin 2day and it was pulling hard and didn't break up 1 bit

BigManne

iTrader: (3)

bad gas maybe?

94_soarer

iTrader: (8)

I doubt that..

BigManne

iTrader: (3)

think i found your problem

https://www.clublexus.com/forums/per...-1jz-swap.html

94_soarer

iTrader: (8)

I appreciate ur help bro...when I pulled the coil packs out non of them were cracked but we will see how the car acts