[Biturbos4] several niggling issues

Brandon Rogers brogers at terrix.com
Wed Nov 8 11:30:36 EST 2006

Thanks guys.

Last night I found _both_ bypass valves had torn diaphragms - luckily
had a couple spares (different part numbers but better than two broken
ones!) - am going to order 710Ns today.

I have the H&R coilovers - threaded shock bodies - any input on these vs
Stasis Street Sports?

Will get on the other items

Thanks again

'84 urquattro 20Vt
'01.5 S4
'98 A4 1.8Tq

-----Original Message-----
From: Wilson Northrup [mailto:northrup at crazybug.com] 
Sent: Tuesday, November 07, 2006 5:23 PM
To: Brandon Rogers
Subject: Re: [Biturbos4] several niggling issues

1. throttle body boot and bypass valves.  check them, maybe replace it 
with something better.  there are lots of options, i choose the samco 
option and forge bpv.  you might follow the other posters advice for 
something cheaper that is also good.

2. bleed the fluid. i use motul 600 but other fluid is good too.

3. install them.

4. can't say i like the reach for 5th, i use the UUC short shifter.

5. upgrade to the mirror with built in compas.  get it from clairparts.

6. for me, this was a loose hose for the headlight washers. 1 hour of 
my personal time in the garage to fix.

good luck.

On Tue, 7 Nov 2006, Brandon Rogers wrote:

> Hey guys-
> My S4 is not well.  All sorts of niggling issues.  I like the car, 
> basically, but haven't "fallen" for it like I did ny A4 - and I 
> finally figured out why - all the "driver input" systems are out of 
> whack.
> 1.  Throttle response - the engine is super-hyper-sensitive to 
> throttle input.  Can be jerky.  I am putting together a pressure 
> tester and hope to pressure test the intake in the next day or two.
> What are symptoms of bad (either 1 or 2) bypass valves?
> 2.  The brakes are soft.  There is lots of pedal travel (usually) then

> over-boosted brakes.  It is inconsistent - sometimes the pedal travel 
> is long - every once in a while the brakes engage almost immediately.

> Car has new front pads/rotors - but I think the system needs to be 
> flushed and/or bled.
> 3.  Suspension. Stock is very high and lots of nose dive.  More 
> importantly - the car gets thrown around (I'm not talking tramlining
> here) over virtually any and every road surface imperfection.  I had 
> the car aligned shortly after I got it (Feb) but it still does this - 
> maybe needs to be re-done - maybe they missed something.  There does 
> not sem to be any looseness in the front suspension - I've had plenty 
> of experience with loose control arms on the A4.  I do have soem H&R/ 
> Bilsteins in the garage but am wary to install prior to getting other 
> issues sorted.  Catch 22 I don't want to have the car aligned only to 
> install the new susp and have it done again.  Money doesn't grow on 
> trees around here...
> 4.  The shifter has vague 1st and 5th engagement - sometimes pops out.

> I've had the dealer adjust it and it made a big difference and is 
> definitely a lot better - but the shifter action in my A4 is _much_ 
> better.
> 5.  Rearview mirror is broken - has that "oval" when the auto dim 
> fluid goes by by I guess...will find a used one...
> 6.  Washer fluid reservoir has a leak - it hold a fair amount of fluid

> - but not enough to keep the "low fluid" dash symbol on all the time. 
> Maybe the reservoir is leaking where the sensor is installed - 
> hopefully I can just seal the leak instead of replace the whole 
> reservoir....
> Any insight/tips/fixes appreciated
> Brandon
> '84 urquattro 20Vt
> '01.5 S4
> '98 A4 1.8Tq
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