right then - on the run back from RS we all got a little carried away and i think i was up to about 130 when i backed off
from 80-128 the car was shaking itself apart but settled down at 130 ish
anyways thats not the problem
right then ... 3rd gear doing say 40 mph , foot to the floor it sounds like something is blowing behind the dash ?? - and its really loud - and stops as soon as the turbo starts pulling the car
both boost gauges working fine
so i assume there isnt a pipe off
stop the car ... nail it in first , second , third etc...
there is no noise
its like when the turbo is spooling ( i take it that this is know as lag ?? ) - its like there is someone behind the dash blowing ???? ( yeah i know - sounds silly )
checked under the hood , all pipes seem ok , it boosts fine , boost gauges work ok
any ideas , anyone ??
thanks
Stu
Check the gromit in the bulkhead has\'nt come out.
What you mean is 130 on the Track right ;)
cunning plan matey
will check that - would it make that sort of noise though ??
Just makes the engine bay noises louder.
had a look under the bonnet tonight
all the pipes seem to be on OK - and the only grommet i can see is on the passenger side - and that looks fine
anyother ideas ??
Ta
Stu
( suddenly dreading the worst )
y\'know, on most RX-7\'s most people would consider BRRRRM - BRRRRRRM a funny noise... *LMAO*
I take it the engine idles ok? That would be a sign of a leak if it wont idle.
But having said that if it is just a small vac pipe off it may idle diffrently (maybe a bit higher revs or iratic).
idles just fine ( well as it always has )
like i say - put foot down - and you can hear the turbo spool - just before it kicks in
bit hard to test on the drive with the bonnet up though
just another peice in the puzzle though eh !!
just hope i havent damaged anything ( or damaging it when drivign it )
Stu :(
What air filter do you have in atm? If its suddenly got a big hole inot you would hear the turbo more, itsd also possible you have a hole in the exhaust somewhere...
back to the standard filter - and it only started after the 130 episode :(
and a hole in the exhaust - hummm interesting thoery - why would it do it before the turbo pulls - and stops when the turbo is fully running ??
to me - if there was a hole in the exhaust you would hear it all the time ??
when the car is ticking over and the bonnet up - there is no noise
when you are driving normally - there is no noise
when you put your foot down - you get the noise - then the turbo spools right up to xx psi and noise stops - change gear and floor it - you get the noise - turbo spools to full speed and noise goes
only thing i think of - is at full boost - you cant hear it for the turbo whine - you dont think ive knackered the turbo do you ???
it really wierd - cause im still getting .5 or .6 bar on the boost gauge at full boost
bloody car - really starting to annoy me now
this and the not going in a straight line :( :( :(
will try to investigate more tomorrow - i just need someone to sit in the engine bay whilst i drive along :) - any volunteers ???
Stu
You say it is doing it on boost, is that on Peak (when the wast gate opens) or when it goes into the possative boost?
Chris
chris , i have to admit - that just confused me :)
it seems to do it from vacum to .3 bar on the boost gauge
when the turbo is pushing the car along - it seems to stop
arkward to exaplain with my limited terminology !!
right - see if this explains better
drive along at say 30 mph in 3rd gear
floor it
you get the noise then
when the turbo kicks in ( say at 45 ) the noise stops
does this explain better ??
its like the prespool of the tubo ( if that actually happens or make sense )
its like just before the turbo breaks into life - thats when it happens - so not sure if its a wastegate problem ( i think that lives in the turbo ?? )
but then i have NO idea how to fix it - or where to even begin
i suppose if it is turbo related - then when i get round to fitting the decat - i could have a look
chris - if you heard the car or saw it - would you have a better idea ?? - and what are you like at fitting from decat pipes ???
ta
stu
So it does it when its in Vacume? or starts at 0 and stops at .3?
How does it drive? Does it feel responcive (Turbo spools up quickly)
Do you have a Blow off valve (Dump valve)?
Do you think the Vibration you where getting has anything to do with it?
Are you getting any extra Road noise etc?
What i don\'t understand is you say "it seems to do it from vacum to .3 bar on the boost gauge" Does this mean it stops when you get over .3? This would be confusing? because if it was any sort of boost leak (maybe a small pipe or something) you would expect it to get progressively worse (Louder).
Chris
Quotechris - if you heard the car or saw it - would you have a better idea ?? - and what are you like at fitting from decat pipes ???
[/B]
Proberly..:) and Decats are easy, just don\'t try and struggle round stuff. your better off removing the Upper inlet to get good access to the Back of the turbo.
HEALTH WARNING!!!!! if you take the upper inlet of push some rag into the runners (making sure you can still get it out) so if you drop a nut or somthing you don\'t have to pull the engine to get it out. ;)
QuoteOriginally posted by grinder
its like just before the turbo breaks into life - thats when it happens - so not sure if its a wastegate problem ( i think that lives in the turbo ?? )
i suppose if it is turbo related - then when i get round to fitting the decat - i could have a look
If you are seeing your Target Boost and the boost responce in the gears is good then i\'d say it wasn\'t your wastegate becouse its two jobs are working Properly.
The wastegate on a S5 T2 is atualy two wastegates they are about the size of a pound coin (You may have to open your walet to find out what one looks like :eek) they live in the Hot side of the Turbo (the back bit where the Exhaust bolts up to) they open and close when the Boost presure pushes the Actuator Open (the Round thing on the side of the Turbo with a long arm sticking out) this governs the Boost presure the car is running. Now if you imagen when you are WOT and change gear the Waste gate will be open and the BOV will have let all the boost go, so the wategate will snap shut so the presure can be built back up.
Now if for example the face that wategate mates up to is Damaged or cracked it will take an age for the presure to build up causing poor boost responce in the gears and more than likly will not hit Target Boost.
If the Actuator its self is damaged or leaking you will see excessive boost presures or very low boost presure.
So the moral of the story is if your boost is doing odd things or won\'t hit target boost then you should be looking at the Vac pipes that feed the Actuator,Tha Actuator its self or the waste gate, But from what your saying it sounds like a good old leak.
Does it get better or worse with heat? that is a sign of Exhaust problems (blown gasket etc)
thanks for the ( multiple ) answer
the car boosts just fine - usually spikes to about .6 bar and then settles to .5 - which i think is right for an S5 TII
so according to what you say - it sounds like its not the Actuator , or a boost leakage
cant comment about the heat thing - as i never boot the car until its warm - but it does do it from cold - if you rev to say 3.5K - 4K then you can hear it
its sounding more and more to me like an exhaust thing to be honest - you cant hear it at fool turbo spool as you are hearing the turbo and watching the road more :)
not tooo keen on the upper inlet for the decat - mainly cause i have no idea what you are on about :) - and sounds like a sh1t load of work
there is no dump valve on the car - but thats another story ( still got the stock unit )
all the pipes look OK - from what i can see and the ones i can see
car runs and drives fine - on friday - it pulled fine from 20 - 100 thru the gears
it drives fine at vacuum - and the vibration - not 100% sure to be honest - as its vibrated pretty much since i got the car - and this is a brand new noise
if it is an exhaust leak - any idea how to check or whats the common culprite ???
hope these answers help - sorry about the order of them - but i have been jumping up and down the page to answer your questions !!!
big thanks so far chris
Ta
Stu
( would there be any chance that you could assist with the decat thingy - no rush and feel free to say no )
LOL.
The Exhaust is easy, Jack the side of the car up so you can get under it (don\'t forget Axle stands) then making sure its out of gear kick it up.
Now you will need another set of hands for this bit, get a mate to hold a cloth over the end of the Exhaust pipes (Both at the same time) and then start at the Front (as it gets warm first) and cup hands around the pipe (so there is about 1/2" gap between your hands and the Exhaust) and move down the full lenth of the exhaust.
If it is Blowing you will feel it (even if its slight) as the guy covering the tail pipes will be causing extra presure to make a leak more ovious.
Don\'t forget the Exhaust/Exhaust gasses get hot quick so don\'t mess about, and this is easyer whilst the cars cold.
The hardest part of this exersise is the Down pipe to Turbo, This is a job to Defo be done cold as this gets VERY HOT!!! and to be quite honist if its the Down pipe you will here a farty noise if you rev it.
If you can here the leak whilst driving you can usaly get an idea of where abouts its coming from, So you start there.
Have Fun!!;)
Chris
This is one to do whith the engine off. Whilst the car is up in the Air get hold of the Prop shaft (the big one that goes from the Box to the Diff) grab it next to the Universal Joint (the funny looking flexi joint next to the diff) and see if it will move. It may move in and out (in line with the prop shaft) but it should not move up and down and left to right (if you know what i mean).
Then holding the Companion flange on the diff (the plate the Prop shaft bolts too on the Diff) and the other side of the Universal joint and twist them oposite directions then swap the directions (see if there is any play in the UJ) You should not be able to move it.
This is fairly common and is somthing to check whilst its up.
:D
thanks chris
when i get two mins - i will have a look
that plan at the mo is to take the car to the next meet ( a week on monday )
then when it comes home - get it up on ramps ( well the front )
this should allow me to have a nosey - gonna struggle with the prop shaft with the car at this angle though
thanks again
stu
I\'ll see if i can make it down. Week this Monday yeh.
Chris
yeah the 13th matey
Whats with that Number!!! Its every where i look, i hope this don\'t mean i\'m in for some bad luck!!!!!!!!
Chris
Nice Chatting to ya. can you arange some parking next time ;) LOL
You want a laff, i missed my Junction (21) and got off at 21a which goes onto the M56 so i ended up taking about aq 6-7 mile detour. LOL thats why i was late..
Chris
well i think i have fixed it - disconnected all the boost gauges and put it back to stock and it seems to have stopped :)
Ta
Stu