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Turbo Broken?

hijaked

By hijaked,
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hijaked Collaborator

hijaked

Posted
Posted

Hi guys.

before i had problems.. i used to hear a loud induction noise and then the BOV would let of a high pitched whistle when driving..

now i barely hear the induction noise and the BOV only lets out a puff.

im left with stalling, hardly any boost, unstable speeds and shuddering when slowing down.

does anyone know waht could be wrong, anything that comes to mind would be appreciated!

-Dave-

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No Crust Racing Grand Master

No Crust Racing

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Hmm. the list of possibilities could be huge.. Simple things you can do are pop your head under the hood while idling, give the throttle a pull and try to hold a steady RPM and listen. See if you can hear any noticeable sucking noises when the car tries to build RPM's (not the turbo or air filter). The whole, no induction noise thing makes me think you've got a leak on the inlet side somewhere, such that when you put the throttle down it's drawing air from somewhere beyond your air filter. As such, this air is not measured and accounted for which throws out the whole A/F ratio which in turn effects power and drivability. I know this is very vague but start with simply things, check joins and bends on the inlet side of the equation and see what you find. I've only had my Skyline for bout 2mths so I'm no expert but the above is just basic Air/Fuel and Engine concepts. I'm sure some more people will post with far more useful troubleshooting tips =D

Good luck and keep us posted.

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jwah Collaborator

jwah

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Posted (edited)

Does your exhaust sound any different? My GTR was as gutless as my isuzu work truck. I didnt know wtf was wrong with it. it was running fine then all the sudden i couldnt make much boost at all, the pitch of the exhaust was heaps different and it was SLOW! all that happened was my exhaust was a bit old and a muffler collapsed or somthing. Changed it and it ran like new again. But like ActionDan said, the list of possibilites is huge. Also check your intercooler pipe work, may have blown off a pipe or have a hole in a pipe or even just a pipe has closed in.

Edited by jwah
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hijaked Collaborator

hijaked

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hey thanks for all the replys...

when my car was running "good" it was pushing 150rwkw with a big catback, fmic (restricted by very tight mesh infront), stock boost and a turbosmart plumback bov.

one day i decided to boost my car with a poor mech boost controller.... according to my dodgy boost gauge at 3k it was sitting on 6-7 psi and the at like 4.5k it spiked to 10-11psi. very quickly!

after setting it back to normal, stock, 'safe' boost... im still getting the stalling (which ive tried to help by increasing the idle)... since then the problems gotten worse as stated above!

ActionDan: i can hear a small leak under near the intake manifold, i don't know if this it normal or not, however its not loud enough for me to locate it.

jwah: sounds the same except the idle is crap, so there is no regular note. last time i drove it HEAPS of black smoke comes out when you put the boot into it... exhaust tip is all black and it collects onto the back of my car even

Rhett: its an olderr turbosmart type3 plumb-back, it works fine on my mates car.

mmm gtst: cars got no pettrol in there at the moment, but i dont drive it coz its sick. it was still playing up when it had over a 1/4 tank in. not keen putting it in as last time i did... 15 litres only got me 35k's

i wish i could find the time to look at this car, id even be happier if i had the money to send it to a mechanic... oh wel...

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No Crust Racing Grand Master

No Crust Racing

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Posted

Running bad, black smoke and bad fuel economy means running super rich. This is either due to over fueling or the car is not getting enough air because it's either being measured wrong or getting out of the system somewhere. May be time to take it to see a pro?

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