| GT28RS Kit for the
Audi 1.8T
11/17/04
- Performance Update:
Project Audi A4
which has been happily going along with the successful testing
of the quick spooling GT28RS
kit took an interesting turn recently.
Just for the purpose of data collection, the GT28RS turbo
in the GT28RS kit was swapped out for one of Garrett's newest
GT3071R variants. The results were staggering and what we
found were unprecedented levels of performance and HP output
from the turbo engine, due to the combination of the high
flowing wheel profile and the reduced backpressure. Garrett’s
modern wheel aerodynamics proves again that small engines
can make big HP AND Torque!
As dyno results here indicate, over 400 ft/lbs of torque
is achieved before 4500 rpm and peak HP is 426 WHP on the
Quattro (all wheel drive) drivetrain. This equates to over
500 HP at the flywheel before the frictional loss through
the drive line. To test real world performance, the car
was taken to the track and an 11.97
second timeslip was produced. Trap speeds reached
as high as 121MPH. Simply amazing!
Noteworthy: All engine
components including engine block, cylinder head, cams,
etc. remain stock. Only reprogramming of the stock ECU along
with larger injectors were required to accomodate the additional
horsepower.
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05/23/04 - 1/4 Mile
Update:
Our GT28RS powered project Audi A4 gave most of the street
cars @ this weekend's CMI event a run for the money!
For this event, we installed
our newly developed 3" exhaust diverter valve at the 3" section
right out of our downpipe. Previously, the car was
running the 3" downpipe that transitioned down to 55mm (2.25")
into the stock 55mm exhaust system, but had an exhaust diverter
after the transition down to 55mm. The beauty of the current
system is it's entirely boost actuated, using an actual wastegate
actuator and only opens under boost conditions. During cruising
and part throttle driving, the car feeds through the stock
exhaust and is completely quiet and stealthy. When boost is
present and back pressure needs to be reduced, the exhaust
diverter can free up the entire exhaust stream in a matter
of miliseconds.
Back to back runs netted the following ET's:
12.4 @ 110 MPH
12.5 @ 110 MPH
12.5 @ 109 MPH
Our 60 ft times went from 1.80 to 1.83 - 1.85 range. We're
finding that traction is a real issue now even with the quattro
as all 4 wheels are spinning off the line and well into the
2nd gear shift, forcing us to "let off" through both gears.
The next step is to swap out the stock suspension for something
a little bit more aggressive in order to harness and use ALL
the power that the GT28RS is currently putting out.
At this point, we have to ponder...with the better suspension
and swapping out the extremely heavy S4 wheels for the stock
A4 wheels, will the project GT28RS A4 run 11 second timeslips? |
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05/07/04
- 1/4 Mile Update:
With the addition of an 55mm
exhaust diverter to overcome the bottleneck of the stock exhaust
and a little more practice on the launch, we were able to
get our GT28RS project A4 QT to dip well into the 12 second
range.
Back to back runs netted the following ET's:
12.9 @ 105.5
12.8 @ 106.68
12.78 @ 106.73
12.70 @ 106.74
12.66 @ 105.78
60 ft times went from 2.0 seconds to 1.8 to 1.9 range.
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| The GT28RS turns
this mostly stock Audi 1.8T into a street and strip monster. |
| Our last project Audi A4 resulted
in a 500+ HP 2.0L GT35R powered FWD drag monster that runs 125MPH
trap speeds in street trim. Since we had to install a roll cage,
not too many A4 owners could relate any longer. |
 |
| Hence the reason,
we've gone back to basics and started another project on another
A4 that most people could relate to...a stock All Wheel Drive
1.8T (Quattro) with all stock driveline components. In this
project, we do nothing more than to install a bolt-on GT28RS
kit and the appropriate clutch to support the power. |
 |
Test
Vehicle:
1997 Audi A4 Quattro (No, it's not an S4 - look at the license
plate)
Engine:
Completely Stock 1.8T (AEB Code)
Exhaust:
Stock
Tranny:
Stock Audi Quattro Drivetrain
ATP 4 Puck Stage IV Clutch and Aluminum Flywheel
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Turbo:
GT28RS - "QS" (Quick Spool) Edition
Internal wastegate
Front Mounted Intercooler
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Fuel:
475cc Injectors
ATP Custom chip |
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Implementation
(See dyno sheet):
Old KKK- K03 Turbo Makes a whopping 119 WHP on the AWD DynoJet
Dyno
In chipped form, the K03 spikes to 18 psi and has a hard time
holding 15psi to redline.
Result: 143 Wheel HP, 198 W Torque
1/4 mile time is a respectable: 15.1 @ 94 MPH |
Click for enlarged version. |
New GT28RS
- ATP Prototype GT28RS kit with 3" Downpipe and stock exhaust
With N75 valve removed and boost set at 22 psi, result: 295
Wheel HP, 328 Wheel Torque
1/4 mile time is a repeatable: 13.0
@ 107 MPH
With additional exhaust mods, expect the Wheel HP to dip well
into the 300+ range and the ¼ mile to be well into the
12 second zone with 110+ trap speeds.
The bolt-on GT28RS kit for the B5/B6 Audi A4/VW Passat 1.8T
due to be released May 31, 2004 and will carry an MSRP
of $2399.
A bolt-on Front Mounted intercooler kit will be optional @ $995.00. |
05/07/04
- 1/4 Mile Update:
With the addition of an 55mm exhaust
diverter to overcome the bottleneck of the stock exhaust and
a little more practice on the launch, we were able to get our
GT28RS project A4 QT to dip well into the 12 second range.
Back to back runs netted the following ET's:
12.9 @ 105.5
12.8 @ 106.68
12.78 @ 106.73
12.70 @ 106.74
12.66 @ 105.78
60 ft times went from 2.0 seconds to 1.8 to 1.9 range.
|
05/23/04
- 1/4 Mile Update:
Our GT28RS powered project Audi A4 gave most of the street cars
@ this weekend's CMI event a run for the money!
For
this event, we installed our newly developed 3" exhaust diverter
valve at the 3" section right out of our downpipe. Previously,
the car was running the 3" downpipe that transitioned down to
55mm (2.25") into the stock 55mm exhaust system, but had an
exhaust diverter after the transition down to 55mm. The beauty
of the current system is it's entirely boost actuated, using
an actual wastegate actuator and only opens under boost conditions.
During cruising and part throttle driving, the car feeds through
the stock exhaust and is completely quiet and stealthy. When
boost is present and back pressure needs to be reduced, the
exhaust diverter can free up the entire exhaust stream in a
matter of miliseconds.
Back to back runs netted the following ET's:
12.4 @ 110 MPH
12.5 @ 110 MPH
12.5 @ 109 MPH
Our 60 ft times went from 1.80 to 1.83 - 1.85 range. We're finding
that traction is a real issue now even with the quattro as all
4 wheels are spinning off the line and well into the 2nd gear
shift, forcing us to "let off" through both gears.
The next step is to swap out the stock suspension for something
a little bit more aggressive in order to harness and use ALL
the power that the GT28RS is currently putting out.
At this point, we have to ponder...with the better suspension
and swapping out the extremely heavy S4 wheels for the stock
A4 wheels, will the project GT28RS A4 run 11 second timeslips? |
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Now shipping all pre-orders!
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