ODD NOISE..!

J

Jason Hall

Guest

• Jul 31, 2004

• #1

My Friend and I put parabolics and es3000 shocks on my S3 88 today..
Took us 6 hours and we just about managed it..Our combined skills seem to
just cover a 3 spanner rating in the manual.. hehe

Any way Hurrah ! the back now sits level with the front and dosnt sag
horribly.
the steering is loads lighter and dosnt drift all over anymore.So great news
there.

BUT , when you release the accelerator to decelerate it makes a strange
windy grindy noise.
Sounds almost like someone blowing air under the front end .( free wheel
hubs on/off no change)

I assume its from the transmission or diffs..?

Anyway only occurs under deceleration and has put a downer on an other wise
succsessfull day.

The only thing i can think of is , as it now sits higher up, the uv joints
on the drive shafts are at more of an angle..?

To be honest i have no idea and wondered if anyone has seen this problem or
heard this odd noise.

You know if u pull off with too low revs and the gearbox makes a low grindy
whooshy noise. Its kinda like that , maybee.

Jason.

--
http://homepage.ntlworld.com/jason.hall8/Sites.html

 

W

[email protected]

Guest

• Jul 31, 2004

• #2

On Sat, 31 Jul 2004 19:55:39 GMT, "Jason Hall"
<[email protected]> made me spill my meths when he wrote:

>BUT , when you release the accelerator to decelerate it makes a strange
>windy grindy noise.
Is it a prolonged noise or something akin to the duration of movement
of the vehicle as it changes it's attitude under
deceleration/acceleration?

>The only thing i can think of is , as it now sits higher up, the uv joints
>on the drive shafts are at more of an angle..?
Might be worth pumping some fresh grease through them if they have
nipples. Likewise the propshaft joints.

>To be honest i have no idea and wondered if anyone has seen this problem or
>heard this odd noise.
Not exactly related but while on the subject of new suspension, did
you put new bushes on as well. I can;t remember the exact procedure
but there is something in the back of my mind about only tightening
things up once the correct attitude has been found for the vehicle
lest the bushes suffer a shortened life. Maybe they are groaning
already


--
Wayne Davies - Mobile 07989 556213 - Harrogate, N.Yorks, UK

 

J

Jason Hall

Guest

• Jul 31, 2004

• #3

Yes not prolonged only as the vehicle changes its attitude..
Id say. at 50mph , release throttle, makes noise for maybee 4 or 5 seconds
until revs are low again.
If u dip the clutch it stops the noise..


> >BUT , when you release the accelerator to decelerate it makes a strange
> >windy grindy noise.
> Is it a prolonged noise or something akin to the duration of movement
> of the vehicle as it changes it's attitude under
> deceleration/acceleration?
>
> --
> Wayne Davies - Mobile 07989 556213 - Harrogate, N.Yorks, UK

 

W

[email protected]

Guest

• Jul 31, 2004

• #4

On Sat, 31 Jul 2004 20:25:20 GMT, "Jason Hall"
<[email protected]> made me spill my meths when he wrote:

>Id say. at 50mph , release throttle, makes noise for maybee 4 or 5 seconds
>until revs are low again.
>If u dip the clutch it stops the noise..

It's your wallet breathing out. Keep your foot off the throttle, it'll
go away.
--
Wayne Davies - Mobile 07989 556213 - Harrogate, N.Yorks, UK

 

L

Lizzy

Guest

• Jul 31, 2004

• #5

Jason Hall wrote:
> My Friend and I put parabolics and es3000 shocks on my S3 88 today..
> Took us 6 hours and we just about managed it..Our combined skills seem to
> just cover a 3 spanner rating in the manual.. hehe
>
> BUT , when you release the accelerator to decelerate it makes a strange
> windy grindy noise.
> Sounds almost like someone blowing air under the front end .( free wheel
> hubs on/off no change)
>
> I assume its from the transmission or diffs..?
>
> Anyway only occurs under deceleration and has put a downer on an other wise
> succsessfull day.
>
> The only thing i can think of is , as it now sits higher up, the uv joints
> on the drive shafts are at more of an angle..?

As a 101FC driver your theory sounds quite sound, in fact try driving in
a 101FC and then you'll *really* know what the propshaft rumble sounds
like. Here is a quote from the 101 faq

> 2.1 Is that front propshaft noise normal?
>
> Yes, many/most 101s have a rumbling sound coming from the front prop shaft, especially when coasting - ie front shaft is spinning rapidly but not being driven by engine power. The extreme angle of the front propshaft causes this vibration.

read more at http://www.lrfaq.org/FC/FAQ.FC.101.html

Somewhere out on the web are details of how to "roll" the diff to alter
the propshaft angle and reduce the noise, but just at the moment I can't
find the link.

Lizzy

 

S

Simon Isaacs

Guest

• Aug 1, 2004

• #6

"Jason Hall" <[email protected]> wrote in message
news:%[email protected]...
> My Friend and I put parabolics and es3000 shocks on my S3 88 today..
> Took us 6 hours and we just about managed it..Our combined skills seem to
> just cover a 3 spanner rating in the manual.. hehe
>
> Any way Hurrah ! the back now sits level with the front and dosnt sag
> horribly.
> the steering is loads lighter and dosnt drift all over anymore.So great
news
> there.
>
> BUT , when you release the accelerator to decelerate it makes a strange
> windy grindy noise.
> Sounds almost like someone blowing air under the front end .( free wheel
> hubs on/off no change)
>
> I assume its from the transmission or diffs..?
>
> Anyway only occurs under deceleration and has put a downer on an other
wise
> succsessfull day.
>
> The only thing i can think of is , as it now sits higher up, the uv joints
> on the drive shafts are at more of an angle..?
>
> To be honest i have no idea and wondered if anyone has seen this problem
or
> heard this odd noise.
>
> You know if u pull off with too low revs and the gearbox makes a low
grindy
> whooshy noise. Its kinda like that , maybee.
>

Some of this caused by the change in angle of the prop, as the changed
suspension geometry causes the front diff to nose down slightly more

Do not forget to check all the bolts in about 50 to 100 miles time as things
will settle.

--
Simon Isaacs

Peterborough 4x4 Club Vice Chairman, Newsletter Editor and Webmaster (how
much more....)
3.5V8 100" Hybrid, now LPG converted
Part owner of 1976 S3 LWT, Fully restored, waiting on the appointment with
the nice man at the MOT station!
Suzuki SJ410 (Fiancée's) 3" lift kit fitted, body shell now restored and
mounted on chassis, waiting on a windscreen and MOT
Series 3 88" Rolling chassis...what to do next
1993 200 TDi Discovery (the Pug 106 is dead, long live the Pug)

Peterborough 4x4 Club http://www.peterborough4x4.co.uk

 

T

Tom Woods

Guest

• Aug 1, 2004

• #7

On Sat, 31 Jul 2004 19:55:39 GMT, "Jason Hall"
<[email protected]> wrote:

>My Friend and I put parabolics and es3000 shocks on my S3 88 today..
>Took us 6 hours and we just about managed it..Our combined skills seem to
>just cover a 3 spanner rating in the manual.. hehe

Right after i did mine i had the same sorta noise. On mine it was the
centre sliding joint on the rear prop. the change in angle was enough
to make it sit slightly differently and make the wear evident.
Shows itself as a scary loud rumble (slightly grindy rattly rumble
too) on the overrun (so as you let off the accelerator).

It sounds like youve got the same problem!

To check if it is the rear prop, take it off and then go for a brief
drive with it in 4wd.

 

J

Jason Hall

Guest

• Aug 1, 2004

• #8

That sound very much like the problem..

Did u have to replace the prop.?



>
> Right after i did mine i had the same sorta noise. On mine it was the
> centre sliding joint on the rear prop. the change in angle was enough
> to make it sit slightly differently and make the wear evident.
> Shows itself as a scary loud rumble (slightly grindy rattly rumble
> too) on the overrun (so as you let off the accelerator).
>
> It sounds like youve got the same problem!
>
> To check if it is the rear prop, take it off and then go for a brief
> drive with it in 4wd.
>

 

T

Tom Woods

Guest

• Aug 1, 2004

• #9

On Sun, 01 Aug 2004 21:30:11 GMT, "Jason Hall"
<[email protected]> wrote:

>That sound very much like the problem..
>
>Did u have to replace the prop.?

I replaced my whole prop. I got a second hand one, but new ones arn't
that expensive.

 

T

terry

Guest

• Aug 2, 2004

• #10

Jason Hall wrote:
> My Friend and I put parabolics and es3000 shocks on my S3 88 today..
> Took us 6 hours and we just about managed it..Our combined skills seem to
> just cover a 3 spanner rating in the manual.. hehe
>
> Any way Hurrah ! the back now sits level with the front and dosnt sag
> horribly.
> the steering is loads lighter and dosnt drift all over anymore.So great news
> there.
>
> BUT , when you release the accelerator to decelerate it makes a strange
> windy grindy noise.
> Sounds almost like someone blowing air under the front end .( free wheel
> hubs on/off no change)
>
> I assume its from the transmission or diffs..?
>
> Anyway only occurs under deceleration and has put a downer on an other wise
> succsessfull day.
>
> The only thing i can think of is , as it now sits higher up, the uv joints
> on the drive shafts are at more of an angle..?
>
> To be honest i have no idea and wondered if anyone has seen this problem or
> heard this odd noise.
>
> You know if u pull off with too low revs and the gearbox makes a low grindy
> whooshy noise. Its kinda like that , maybee.
>
> Jason.
>
> --
> http://homepage.ntlworld.com/jason.hall8/Sites.html
>
>

Hi Jason,

Chances are that it could be because you've altered the working range of
the Universal joints, ie perhaps before they operated 3-7 degrees for
example, now they working 5-8. (figures are speculative, and for example
only!)

You could try removing the rear prop and engaging 4wd and try again
(using only fwd) if noise goes away, thats the problem.

If this is so, I would recommend changing the joints, as a) they are
cheap and b) If the constant riding over worn/unworn bearing area causes
a failure, then that *IS* going to make a big noise...

Also the working range of the expansion joint of the prop will have
changed. The prop will now need to be slightly longer as the rear
suspension is further from the body. Could be that the prop wont
*stretch* due to an established wear pattern, causing a end load into
the handbrake etc. Removal of prop as above will show this up.

Let us know what it was when you find it?

Terry

 

J

Jason Hall

Guest

• Jul 31, 2004

• #11

Yes not prolonged only as the vehicle changes its attitude..
Id say. at 50mph , release throttle, makes noise for maybee 4 or 5 seconds
until revs are low again.
If u dip the clutch it stops the noise..


> >BUT , when you release the accelerator to decelerate it makes a strange
> >windy grindy noise.
> Is it a prolonged noise or something akin to the duration of movement
> of the vehicle as it changes it's attitude under
> deceleration/acceleration?
>
> --
> Wayne Davies - Mobile 07989 556213 - Harrogate, N.Yorks, UK

 

L

Lizzy

Guest

• Jul 31, 2004

• #12

Jason Hall wrote:
> My Friend and I put parabolics and es3000 shocks on my S3 88 today..
> Took us 6 hours and we just about managed it..Our combined skills seem to
> just cover a 3 spanner rating in the manual.. hehe
>
> BUT , when you release the accelerator to decelerate it makes a strange
> windy grindy noise.
> Sounds almost like someone blowing air under the front end .( free wheel
> hubs on/off no change)
>
> I assume its from the transmission or diffs..?
>
> Anyway only occurs under deceleration and has put a downer on an other wise
> succsessfull day.
>
> The only thing i can think of is , as it now sits higher up, the uv joints
> on the drive shafts are at more of an angle..?

As a 101FC driver your theory sounds quite sound, in fact try driving in
a 101FC and then you'll *really* know what the propshaft rumble sounds
like. Here is a quote from the 101 faq

> 2.1 Is that front propshaft noise normal?
>
> Yes, many/most 101s have a rumbling sound coming from the front prop shaft, especially when coasting - ie front shaft is spinning rapidly but not being driven by engine power. The extreme angle of the front propshaft causes this vibration.

read more at http://www.lrfaq.org/FC/FAQ.FC.101.html

Somewhere out on the web are details of how to "roll" the diff to alter
the propshaft angle and reduce the noise, but just at the moment I can't
find the link.

Lizzy

 

S

Simon Isaacs

Guest

• Aug 1, 2004

• #13

"Jason Hall" <[email protected]> wrote in message
news:%[email protected]...
> My Friend and I put parabolics and es3000 shocks on my S3 88 today..
> Took us 6 hours and we just about managed it..Our combined skills seem to
> just cover a 3 spanner rating in the manual.. hehe
>
> Any way Hurrah ! the back now sits level with the front and dosnt sag
> horribly.
> the steering is loads lighter and dosnt drift all over anymore.So great
news
> there.
>
> BUT , when you release the accelerator to decelerate it makes a strange
> windy grindy noise.
> Sounds almost like someone blowing air under the front end .( free wheel
> hubs on/off no change)
>
> I assume its from the transmission or diffs..?
>
> Anyway only occurs under deceleration and has put a downer on an other
wise
> succsessfull day.
>
> The only thing i can think of is , as it now sits higher up, the uv joints
> on the drive shafts are at more of an angle..?
>
> To be honest i have no idea and wondered if anyone has seen this problem
or
> heard this odd noise.
>
> You know if u pull off with too low revs and the gearbox makes a low
grindy
> whooshy noise. Its kinda like that , maybee.
>

Some of this caused by the change in angle of the prop, as the changed
suspension geometry causes the front diff to nose down slightly more

Do not forget to check all the bolts in about 50 to 100 miles time as things
will settle.

--
Simon Isaacs

Peterborough 4x4 Club Vice Chairman, Newsletter Editor and Webmaster (how
much more....)
3.5V8 100" Hybrid, now LPG converted
Part owner of 1976 S3 LWT, Fully restored, waiting on the appointment with
the nice man at the MOT station!
Suzuki SJ410 (Fiancée's) 3" lift kit fitted, body shell now restored and
mounted on chassis, waiting on a windscreen and MOT
Series 3 88" Rolling chassis...what to do next
1993 200 TDi Discovery (the Pug 106 is dead, long live the Pug)

Peterborough 4x4 Club http://www.peterborough4x4.co.uk

 

T

Tom Woods

Guest

• Aug 1, 2004

• #14

On Sat, 31 Jul 2004 19:55:39 GMT, "Jason Hall"
<[email protected]> wrote:

>My Friend and I put parabolics and es3000 shocks on my S3 88 today..
>Took us 6 hours and we just about managed it..Our combined skills seem to
>just cover a 3 spanner rating in the manual.. hehe

Right after i did mine i had the same sorta noise. On mine it was the
centre sliding joint on the rear prop. the change in angle was enough
to make it sit slightly differently and make the wear evident.
Shows itself as a scary loud rumble (slightly grindy rattly rumble
too) on the overrun (so as you let off the accelerator).

It sounds like youve got the same problem!

To check if it is the rear prop, take it off and then go for a brief
drive with it in 4wd.