KO3 or KO4 turbo for my A4 (B6)

[Henry A Harper III]

APR has a B6 K04/chip/injectors kit for $2k ish that is a ~60hp bump (that's
probably measured with upgraded exhaust which they say is recommended but
not "required"; kit also offered without injectors but maybe that's assuming
you already have upgraded injectors?)
http://www.goapr.com/products/turbo_b6a4_k04.html
Their dyno graph does not show (through skillfull endpoint selection?) the
typical "turbo lag" low RPM torque hole that results from bolting on a
larger turbo.

> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com]On Behalf Of Nicholas Miller
> Sent: Friday, March 23, 2012 9:38 AM
> To: Arthur Marks; quattro at audifans.com
> Subject: Re: KO3 or KO4 turbo for my A4 (B6)
>
>
> I suppose upgrading it can't hurt.  If the larger turbo is more efficient
> you will see lower intake temps from improved thermal efficency when it
> compresses the air,  and usually larger compressor wheels are more
> efficient and produce less heat.
>
> It will also let the person flashing the ecu program for boost better most
> likely.
>
> As for a real power increase without supporting mods, its doubtfull to be
> much, I would guess 5 to 15hp in some spots that the new turbo is
> better at
> than the old one and very little peak, unless the chip increases peak
> boost.
>
> I would research more the platform and see if it needs a new intake or
> exhaust more to breathe better and at least do an exhaust downpipe and
> catback.  I can't speak specifics to the b6 platform as I don't know it as
> well as the older cars.
>
> Nick
> On Mar 23, 2012 10:30 AM, "Arthur Marks" <aamarks at cox.net> wrote:
>
> > I think the strange random sound coming from my A4 is the turbo
> going bad
> > (inconsistent grumbling at low acceleration).
> >
> > I don't want to get into too many modifications. Would upsizing
> the turbo
> > with just a chip tuning be any better or do you have to start changing
> > exhaust, injectors,... to get any benefit from it? I would be doing the
> > work myself so suggestions on where to send the chip would help too.
> >
> > Thanks,
> >
> > --Art
> > A4, (B6) 100k miles
> >
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