[Biturbos4] Turbos Reliability & Replacement Cost (was: 2000 S4 Running Hot)
rohanj_singh at yahoo.com
Wed Aug 31 17:08:54 EDT 2005
Thanks again JY. I'll look into the parts you
mentioned. Which exhaust would you recommend based on
my wanting one that is not loud and does not look like
a bazooka sticking out the back! Hopefully, all this
stuff is available in Canada. Otherwise, I may have to
get some of this stuff done on one of my trips to
--- j y <jimnetpa at yahoo.com> wrote:
> Depending on your $$$....I would upgrade the exhaust
> (look at AWE, Milltek, etc.) to a TRUE dual. The
> stock S4 exhaust is a bottle-neck - even for K03
> turbos. I would then consider a chip (if u haven't
> done this yet). If you purchase the chip first - the
> turbos will be spinning so hard (especially with
> GIAC-X) that you will defintely get too much back
> pressure and potentially cause K03 (turbo) failure.
> That's why I recommend opening up the exhaust first.
> If your piggy bank is fairly big...then u might want
> to add DPs (down-pipes) to your exhaust uppgrade
> list. There are two approaches here...Piggie
> Pipes..where the pre-cats are gutted (the S4 has 4
> cats for the un-informed)..or purchase DPs that have
> the pre-cats totally eliminated.
> By upgrading to a true dual exhaust and adding DPs,
> you will have eliminated most of the restrictions on
> the "hot" (exhaust) side of your K03s. Thus, they
> will spool up faster and giev you even MORE of a
> kick in the pants.
> The downside is potential turbo overspin which can
> kill your K03 turbos...so far..this has NOT happened
> to me...I've had a true dual/DPs with no-cat set-up
> for almost a year...I run my car hard (boost to 19
> psi)...which I know isn't wise. If you purchase the
> chip (GIAC, AMS, APR, etc.), the dual exhaust, and
> DPs, you will be considered Stage 2+ (with Stage 3 -
> K04 turbos - being the hightest). Expect to have
> spent at least $1500 - $2000 (USD) for a typical
> Stage 2+ set-up, depending on where you source your
> parts, and whether they are used, or new.
> If you decide to modify the "cold" side (intake) of
> your S4, you will reduce "heat soak" on your K03s by
> purchasing AWE or stock RS4 ICs (intercoolers). The
> stock ICs can handle a Stage 2+ S4, but you will be
> putting a strain on them, especially during the
> summer. AWE ICs will cost about $1200 (USD) plus
> labor to install. I installed AWE ICs on my S4.
> At this point, your S4 will be considered Stage 2++
> (a hair under Stage 3-, K04 turbos, using K03
> There has been some debate on whether a K&N set-up
> is better than the stock airbox. Based on my VAG run
> logs, KEEP THE STOCK AIRBOX, the argument about the
> K&N set-up flowing better is BS! You will do nothing
> but breathe HOT ENGINE AIR with the K&N set-up which
> will adversely impact your MAF readings and timing.
> Oh yeah...dont't forget to upgrade your DVs
> (diverter valves)...personally..the Bosch 710Ns are
> as good as any Hyberboost, Forge, or Bailey DV.
> Plus, they cost $35 ea (USD) and are a OEM item on
> the Audi TT. Just go to your local Audi (or
> Volkswagen) dealer and ask for them. You will need
> two..you can install them yourself...in under 20
> miniutes. I wouldn't upgrade my DVs unless I was
> At the end of the day...to go from a stock S4 (Stage
> 0) to Stage 2++ will set you back approximately
> $3500 (USD). Hope this helps.
> Rohan Singh <rohanj_singh at yahoo.com> wrote:
> Thanks for the tip JY. I know very little about
> upgrades so it is certainly helpful to get guidance
> the planning stages. I like the idea of a gradual
> upgrade as I don't have big bucks to spend
> immediately. Where does one typically start if one
> could spend a couple thousands dollars to begin
> A chip comes to mind, but I guess that is the
> way to the demise of the existing K03 turbo's!
> --- j y wrote:
> > Well.......
> > If you haven't made mods to the exhaust (larger
> > dual exhaust, removed pre-cats from DPs) and
> > (APR Bi-pipe or SAMCO TBB, larger ICs) then you
> > NOT realize the potential of K04s. I would NOT
> > recommend putting K04s on Stage 1 (just a chip) S4
> > w/o the aforementioned upgrades - first.
> > Even after the aforementioned upgrades, you should
> > also upgrade the fueling, MAF, Y-PIPE, turbo
> > hoses, etc. This will set you back some $$$.
> > In my opinion, it's BEST to SLOWLY work your way
> > to a K04 (Stage 3) set-up, unless you have mucho
> > burnin' in your pocket. Believe me, a stage 2, 2+,
> > 2++ set-up will put your S4 in a different
> > - not quite Stage 3 - but awful close. You WON'T
> > disappointed!
> > Rohan Singh wrote:
> > Thanks for the info Quincy. I'll begin to save up!
> > Any
> > opinions on whether it is worth switching to Ko4's
> > on
> > a car with around 100K kilometres (About 62K
> > I'm planning to keep the car to the very end so
> > maybe
> > it is huh?
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