Boosting Problems. Hard To Drive Plz Help :(

[Shmee33]

Hi guys,

I'm having problems while driving my r33 gtst.

when accalerating from 2,000rpms to about 4,000 im getting major lag but when i go to plant the foot it feels better.

its feeling like the turbo is really holding back and im getting nothing?

i have replaced my coils and they were a part of the problem but still having issues.

i can't remember the last tune it had and have an unknown history with the turbo?

p.s my car isnt reving out to the 7,800rpm?. im getting 5,700rpm maxx???

hhheeelllllppp.

thanks alex

[ClutchBurndout-:(]

first things first, boost leak? leak in the lines somewhere? check all your piping. report back

[DVS JEZ]

have you checked/changed the spark plugs, intercooler pipes airflow meter piping, checked timing, is it using lots of fuel, blowing any smoke?

checked air filter?

change fuel filter?

[GTScotT]

Have you used water in the engine bay recently? Sounds like you might have water down your spark plug valley.

[Shmee33]

Yeah, it is using a lot of fuel. Actually, I have changed the spark plugs on it and I've checked all the piping too. I havn't checked either filter.

[Shmee33]

na not water its been like this a while now.

iv checked lines but they seem fine?

[DVS JEZ]

did u use new coilpacks or 2nd handies? does it miss at idle at all?

pull the plugs back out and see what colour they are and if they are all evenly coloured. this will tell u if the problem is in 1 or more cylinders, if its only 1 then it might be injector, spark plug coilpack etc,

if its all then could be airflow meter or sensor etc

[Shmee33]

the coils were brand new super spark coils.

ill change the fuel filter cos it never been done and ill check the spark plugs.

yeah its shagged on idle, it always going between 700 and 1100.

it never wants to stall tho?

[DVS JEZ]

what ecu are you using? sounds like the idle air valve is playing up if its idling like that.

[Moodles2]

While it's idling, use a spray with alcohol (wd40, brake cleaner etc) around the throttle body/intake manifold.. if theres a leak the revs will react and climb momentarily

[Shmee33]

ill be straight with yas, i got an unknown history with the ecu to. i have an modifide intake plenum to, its the standard skyline intake but the plenum one front not the side, its like thery have just welded it up on the side and made the fitting on the front??

injectors i have no history on to?

[Shmee33]

its my 2nd skyline and i know my first one was alot more responsive then this one.

[defari]

how much boost are u running?

[Shmee33]

standard boost. 7psi

[Shmee33]

hey,

i sprayed my manifold and interccoling piping with wd40 and no sudden change in revs??

also changed the fuel filter and still no change!!

on idle it sounds like its putting a deep sound and isnt holding rev crash hot.

its going up and down with the revs, from 900rpm to 1100rpm like it cant find its idle??

starting to get angry at it..

its got the same amount of power as a vn ss standard..

[butch]

idle air control . ingnitor module ? sounds like the vaccum is at fault

[Shmee33]

could that be why a lack of kw???

its pretty major cos i have kick behind my accaleration and its been like this for a long time..

[R33 Sleeper]

car only hits full boost after i think 4500rpm and is 5psi before that so it may seem like a sudden "kick" when on full boost, and it may be hitting r&r in the high rev renge due to boost leek if you have turbo back exhaust etc, hence the cutting out?

[Shmee33]

all standard from the turbo back...

my last car had same mods.

could spark be an issue?

[MrR33666]

possible coolant temp sensor. have you checked for any codes? dud coolant temp sensor will cause the car to run rich and cause the idle to hunt