Rb25Det Fuel Cut

[JFK33]

Hi all!

need some major help with my skyline, renctly wound the boost up to 1.3 bar for a track day,

long story short blew exuast manifold gasket, put a new one in took it for a drive and the car hesitates to boost, at about .3 bar it feels like it hits a wall. looses all power until you take foot off the throttle and it will come back to life.

Ive changed;

Spark plugs and gaped to .8

new coil packs

AFM

checked;

sensors

boost leaks- none that i could find with carby cleaner

Also tried re setting the ECU

Can any body throw some suggestions my way??

[GTSBoy]

You were running 1.3 bar on std ECU? Standard turbo?

[Simon-S14]

More info

[JFK33]

yeah standard ecu stand turbo, it has pwr intercooler and full exuast system.

it had a e manage but i took it out to get 1.3 bar, i was told it was safe.

[JFK33]

is there any way of stopping the fuel cut?

[GTSBoy]

You sir, have probably blown the turbine off the turbo shaft. Congratulations. Didn't you know that you shouldn't run them at such ridiculous boost levels?

And the std ECU will freak out if you try to run it like that too.

[JFK33]

well the guy that advice me to do that organises all the drift meets here, forgot to mentioned i thort i might have blown the turbo so i took it out and checked it but it seems to be fine and ive also put another standard turbo on just to eliminate that possability,

ive wound it back down to standard psi, now its running rich on idle and when it starts boosting feel like you hit a wall

[GTSBoy]

Collapsed cat is next guess then. Standard ECU would have been trying to put in nearly 100% too much fuel and running the ignition about a million degrees retarded. That would be enough to start a fire in any exhaust system. Could have been fatal to the cat.

[KiwiRS4T]

search or Google "rich and retard"

[JFK33]

ive searched RnR but not convinced that its that..

anither thing is when it starts boosting (before it hits the wall) it soulds like the psi coming out some where from the left hand side, sounds odd and its hard to explaind but ive looked at thres for the last couple of months tryi to diagnose this problem

[JFK33]

If it is RnR how do i fix it?

[abr33]

If it is RnR how do i fix it?

Buy a decent turbo and ecu

[JFK33]

on budget! just want the car to be drivable again

[GTSBoy]

Turbo to manifold gasket.

[JFK33]

good possibilty to be something stupid like that, it already has a metal gasket tho?

[Plattsy]

if it wont rev over 2.5 your afm isnt working.

[Anfanee]

+1 for possible AFM breakage

[JFK33]

ive only just put a new AFS in lastnight and still runs like bags

[Anfanee]

Have you done a compression test for shits and giggles?

[Plattsy]

if its not revving over 2500 revs its the afm. the one you put in could be dead too.