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Possible Cat Blocked On My R34 Gtr?

K33P UP

By K33P UP,
in Engines & Forced Induction

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K33P UP Enthusiast

K33P UP

Posted
Posted

Hey Everyone,

i thought i would see what everyone else thinks on this issue with my GTR, since its the weekend all the shops are closed so i cant take it anywhere until next week :(

This is the problem i am facing, since last night my car hasn't been boosting properly (going to 0.4 bar when it normally goes to 0.8) my exhaust note inst as loud as it normally is when your pressing the accelerator. It all happened when i hit max boost and high revs (7000rpm) it just cut out on me, boost was down and exhaust note was very different all of a sudden. The engine still revs but its very doughy and you can hear the turbo spool a little but not as much. could it be a possible blocked cat? not sure what else it can be, i look at the hoses on the intake and BOV and all seem to be fine.

Any ideas where i could take the car on the gold coast if its not a cat issue?

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K33P UP Enthusiast

K33P UP

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  • Author
Posted (edited)

my car is still making power (0.4 BAR boost) but the car is just struggling to get there and the exhaust is very quiet, if it was a turbo wouldnt it make no boost?

Edited by K33P UP
K33P UP Enthusiast

K33P UP

Posted
  • Author
Posted (edited)

also another thing to add is that both inlet pipes are sucking and the main hose to the plenum is making a fair bit of flow. so the motor is getting air.

if it was the exhaust wheel in the turbo's the intake should be producing flow correct? also there doesnt seem to be any oil usage just alot of fuel dumping out

Edited by K33P UP
Hanaldo Grand Master

Hanaldo

Posted
Posted

my car is still making power (0.4 BAR boost) but the car is just struggling to get there and the exhaust is very quiet, if it was a turbo wouldnt it make no boost?

Well if you've only blown one turbo then the other one will still be boosting.

Check cat first, quick and easy.

MrStabby Grand Master

MrStabby

Posted
Posted

Well if you've only blown one turbo then the other one will still be boosting.

The second turbo will spin, but wont make any boost as the air blows back through the compressor of the dead turbo.... So since OP is getting boost, its not an exploded turbine.

3LGODZILA Proficient

3LGODZILA

Posted
Posted

Load up the car on a dyno or going up a hill and see if the cat starts to glow red. If so its a blocked cat, had same issue with mine when it was stock

lol wouldnt it be much easier and safer just to drop the cat and look? if a turbo is half rooted (also being ceramic) the last thing u wanna do is spin the engine at 7000+ rpm

Fullboost_Performance Apprentice

Fullboost_Performance

Posted
Posted

lol wouldnt it be much easier and safer just to drop the cat and look? if a turbo is half rooted (also being ceramic) the last thing u wanna do is spin the engine at 7000+ rpm

Probably not, loading up meaning 2500-3000rpm up a hill in 4th, so its under load, if the cats blocked doing this for about 10-15 seconds will make it glow, seems easier than jacking the car up, and taking the cat out...

3LGODZILA Proficient

3LGODZILA

Posted
Posted

Probably not, loading up meaning 2500-3000rpm up a hill in 4th, so its under load, if the cats blocked doing this for about 10-15 seconds will make it glow, seems easier than jacking the car up, and taking the cat out...

each to their own, im just saying if theres any chance it could be the turbo i wouldn't be boosting it. when i did my standard turbo the bearings went causing the impeller to spin out of balance (very slightly) causing it to just nip the sides of the housing which chipped tiny bits of the blades off, mind you as soon as it blew i didn't boost it at all on the drive home but if i did im sure it would have just smashed apart the impeller wheel completely and if it were a GTR theres a good chance it will go through the intake side.

K33P UP Enthusiast

K33P UP

Posted
  • Author
Posted (edited)

yep it was definetly the a blocked cat, here is a picture of what it looked like from the front. pretty impressive i must say.

post-57129-0-87488200-1303271335_thumb.jpg

so now i have a new stainless high flow 200 cel cat, the car has never run so good..... makes me think the cat has been blocked since i bought it. best $300 i have spent yet!

thanks for your advice everyone :)

Regards,

Dom

Edited by K33P UP

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