Cars a 2002 sti
turbo is a md231t
mapped by simon (jgm)

Cars been running fine since remap a few weeks ago but Got a very starnge sound from the car... really bugging me now, noticed it a couple of weeks ago, seems to be getting louder...

Sound is just like the noise one of these makes...




usually starts between 2750 and 3100 rpm (depending on gear, load etc), and lasts for about 500 revs, roughly as the boost comes in, if you fettle the throttle i can get the noise to increase and decrease

Dont know if this is connected but is running rough tonight, feels like its missing slightly, was fine all day, just been for a run down the motorway, came off and the thing didnt feel right.. will take it out later and try again... but like i say dont know if they are related..

Any ideas please?

 

Compressor surge. Normal if just a noise, if really bad surge the car will hold back.

It was only a noise when I mapped it and the quickest spool I could get, if it is now worse and you can feel the surge let me know and I will adjust.

Any issues just drop me a line.

Simon

 

I have also had this with a faulty Y pipe

 

cheers simon, only seems to be getting worse, but you know how it is, once you realise something it becomes worse in your head.. as for the running rough it only happened when i came off the motorway, will check later on, may just be a coincidence, but just incase, if it doesnt get better - you say its bad, how so do i need to drive it with a light foot untill i can meet up with you?
just a thought, could it be the plug lead coming loose, as one of them was a crap fit if you remember?

 

fmic... have checked all pipes and they look ok to me.

 

Oh maybe not surge then.

Leak on intercooler pipe or downpipe or uppipe gasket buzzing?

No the coilpack lead the clip on the plug was missing/broken so it was cable toed in place.

 

hum, just a thought but could a slight leak be the cause of the anti-lag changing? if so this may be the answer do you think?

 

Yes

 

Bugger! how the cr@p do i find out where its leaking from?

also just to confirm, a leak would result in stuttering on acceleration?

Oh just had a thought, on the motorway today had a very anoying whoosing noice just below the sterio at around 80mph, sounded like the heater on full blast, turned the blower off but was still there, could this be related?

 

No a leak might not cause hessitation.

Sounds like dumpvalve leaking on motorway.

 

oh ok, so im confused.com now, what is the most likely cause of the hesitation then?

 

The dump valve leaking

 

oh ok, will get it blanked off nxt week and see what happens..

Cheers for all your replys will keep you informed.

um just a thought, if i remove the dv i just stick a bung in the pipe, but what do i do with the small pipe that comes off it?

 

put a bolt or screw in there to block it off.

 

excellent thanks

just going through my paypal account, as cant remember the dealer on here that sold me the thing..

 

Whoo.. just found it, guys name was Sak, anybody know him?
bought on the 6th july

 

Ok i need to buy a bung, any idea what size i would need please, there are several sizes on the net.
need to order one for tuesday delivery,

 

might not be the same but i needed 2 bungs to blank of mine 32mm and a 35mm

 

cheers m8, i will have to take it off 2morrow and measure it to be sure.

Cheers chap

 

did replacing the dead coilpack fix this then?

 

running lovely m8, but strange noise still there

not thee bov cos havnt put it back on yet????

 

Hope it's not the turbo Dave

 

way to burst my bubble m8!

was feeling gr8 till u said that

 

Sorry m8,just putting an idea forward.

 

if it is does it mean its a bad thing - could it not just be a quirky thing, or am i just being hopefull?

 

if it is purely a noise it is probably compressor surge and no issue.. obviously the other symphtoms were related to the coilpack issue..

check it when I see you anyway

 

cheers simon, would appreciate that m8