[s-cars] RS2 Turbo or Innovative Turbo's K26/RS2++?

[Mihnea Cotet]

Rokas,

an RS2 turbo starts spooling up higher in the RPM range than a stock turbo, 
meaning that where the stock turbo gives full boost around 2200-2500 RPM in 
the lower gears, the RS2 gives boost (not full boost though, because of the 
surge line in the compressor map) at around 2600-2800 RPM in the higher 
gears. Full boost is ok to be had around 3000 RPM, but the real kick comes 
in at around 4000 in the lower gears. IMO it is not a problem, it's just a 
matter of shifting gears accordingly. IMO, if you have a 20vt and like to 
drive it from 2000 to 4000 RPM, get a TDI, they have soooo much more torque 
down low.... or a big block V8 with a slushbox :-))))

Now, the point is that a K24 gives a bit of boost (even when chipped, the 
boost levels aren't so high because of the tiny shaft that this turbo has, 
as well as due to the compressor limits themselves), but an RS2, even if it 
gives boost higher in the RPM range, gives much more boost. The difference 
is quite easy: 310-330 lb/ft of torque for a K24 running at its reliability 
limits and 400-440 lb/ft of torque for an RS2 turbo.... when dyno runs are 
being done in 4th gear in both cases, this means 2700-2900 RPM for the K24 
and 3400-3600 for the RS2....

HTH,

Mihnea

At 22:13 23/01/2004 -0500, Rokas Reipa wrote:
>A while ago, I remember discussions on the regular quattro list regarding
>the RS2 automobile as a whole as being very laggy/doggy in the low rpm range
>and having a big power dump later on. I believe it was Pantelis who owned
>one at the time. Is this accurate and if so, does a chip fix it or are other
>things needed as well?
>
>Thanks,
>
>Rokas
>95.5 S6
>
>
>----- Original Message -----
>From: "Lewis, Gary M" <gary.m.lewis2 at boeing.com>
>To: <s-car-list at audifans.com>
>Sent: Friday, January 23, 2004 5:55 PM
>Subject: [s-cars] RS2 Turbo or Innovative Turbo's K26/RS2++?
>
>
>I've been getting a few hits on the RS2 turbo group buy vs. Innovative
>Turbo's K26/RS2++ mod (the turbo Cody and I run).  I hope this helps making
>a few decisions:
>
>It depends IMHO on:
>
>1. the total set-up of the car, and
>2. your preferences of power delivery.
>
>1.  If you are going the full RS2 set-up, including the 26 PSI software,
>either turbo is great.  Anything less in terms of set-up (IA Stage 3, MTM
>1+), go with the RS2 turbo.
>
>2.  If you do go with the full RS2 set-up, ask yourself where you like the
>power delivered.  If you are a sub-3,000 rpm driver, go with the RS2.  If
>you drive like I do, which is slow driving most of the time, but when I want
>to GO!!, it's normally above 3,000 rpm, and I want all the Bolt-On power I
>can get, go with the Innovative K26.  Note I said bolt-on power.  I'm under
>the impression that the Garrett hybrid turbos offer better performance than
>the Innovative K26/RS2++, but they don't bolt on.
>
>Price for Innovative's turbo is $950 w/ exchange K26.
>
>HTH,
>Gary Lewis
>
>1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust Manifold, RS2 Injectors,
>Custom Turbo (K26 Turbine, Factory K26 Cold side (Audi Works '999' P/N) with
>50mm intake and custom Innovative Turbo compressor wheel), TurboXS Type 25
>Bypass Valve, Bilsteins, Eibachs, Big Reds, Spec II Clutch.
>
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