Category Archives: Cadillac Models

Update: 2008 Cadillac STS-V Corsa cold run day 2

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I did a fresh morning baseline with the Spectre intake + Corsa exhaust.


 0.4

Speed W/o Rollout W/Rollout Dist
0 0 0 0.0
10 1.03 0.63 6.9
20 1.75 1.35 22.7
30 2.48 2.08 49.5
40 3.33 2.93 93.1
50 4.26 3.86 154.3
60 5.24 4.84 233.9

60′ time was 2.3 sec, so still not good.  Unfortunately my pre-corsa cold air pre-run earlier in the week — also a 4.8s but 4.8s/5.12s — there was no usable Performancebox data file to compare the details from (tech glitch).

Accel results
Speed(mph)     Time(s)
0-60                   04.8
Distance()     Time(s)     @Speed(mph)
0-60′                  02.3                 32.8
PkAccelG     0.67G
I did disconnect the battery yesterday to speed up relearn, but the transmission is still hitting the rev limiter before shifting on some runs. Over time I suspect it will adjust, although it may need to be tuned to shift sooner.

My prediction is that the Corsa frees up 12-20 hp but I’ll have to get a better test run to prove that.  Today’s raw data is no improvement over the 4.8/4.9s posted prior to the new exhaust.

Compared to running hot in August pre-Corsa:

Today 0.4

August 90F
w/rollout
Speed W/o Rollout W/Rollout Dist Speed(mph) Time 0.44 Dist(f)
10 1.03 0.63 6.9 10 1.01 0.57 6
20 1.75 1.35 22.7 20 1.75 1.31 23
30 2.48 2.08 49.5 30 2.46 2.02 49
40 3.33 2.93 93.1 40 3.31 2.87 93
50 4.26 3.86 154.3 50 4.30 3.86 159
60 5.24 4.84 233.9 60 5.42 4.98 248

The difference appears to be from 50-60 mph.

Max calculated power on this 0-60 run was at 6105 rpm

Max calculated power based on torque delivered for the morning caused traction control to come on at the shift — an unusable run because I had not switched it off —

Here are my IATs for trending:

Corsa Cold Baseline Mar 25 2012 2nd Run



Down Delta MPH (Temps in Deg Fahrenheit)
Item 0 30 45 60 Across Run Heat Add
Ambient 55 55 55 55 0
6 IAT1 61 63 63 63 2 8
32 IAT2 93 93 100 106 13 43
0 MAT 93 93 107 129 36 23

I plan to start recording Richard’s correction calculator for runs so I have that info.  Today was about perfect for a correction factor near ‘1’.  I am using the air temp from IAT1 for the adjustment; Richard suggests use the actual air into the engine, which is IAT1.

Conditions:  Cold run, 3/4 fuel; Weather for this run:

Note: The relative horsepower calculations are made in accordance with  SAE J1349. The standard reference conditions for SAE J1349 are:  Air temp 77 deg F (25 deg C),   29.235 Inches- Hg (990 mb) actual pressure and 0% relative humidity.

2008 Cadillac STS-V Corsa 14157 install

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I went over to Pronto Muffler & Brake Center in Plano, Texas to have my Corsa 14157 axle-back (mufflers) system installed.

Corsa's media shot of the 14157 exhaust system

 

Here is the stock exhaust in place:

The Corsa 14157 system is specified for the 2005-2007 Cadillac STS, but is often used also — with modification — by STS-V owners.

Change in piping angle, 2.5 to 2.5 " join

The Corsa 14157 has 2.5″ piping, like the STS-V exhaust pipes.  In order to get them to fit together Pronto expanded the mouth of the Corsa pipe.  Also, because the angle of the piping was not exact a short section of new pipe was welded in to mate the two.  Finally, all the hangers were removed from the Corsa muffler and new hangers welded in place to fit.

Work in progress -- the shop aligned the exhaust properly then welded in place.

Here is an after shot:

The install took 1 hour of time for the Pronto Exhaust Specialist.  The resulting system sounds great and so far is drone free.

New Corsa Exhaust in place - street view

More info to follow with performance testing. Please let me know if you have any questions about the install.  Pronto is a joy to work with for exhaust installs, and always does a great job on fitment, centering the exhaust correctly etc.  I am happy to recommend them for any exhaust work.

 

Cadillac Signature Styling Enhances ATS Performance

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Hundreds of testing hours in wind tunnel helps reduce drag, wind noise

DETROIT — The 2013 Cadillac ATS’s all-new vehicle architecture provided Cadillac designers with the unique opportunity to tailor the compact luxury sedan’s styling and refinement cues to improve driving performance. This aspect of the ATS’s development is highlighted in the fifth chapter of a YouTube video series.

“The primary function of the ATS is to be a driver’s car, fun to drive, nimble and quick,” said Bob Boniface, Cadillac exterior design director. “It has a great powertrain, great chassis, so we wanted the exterior design to reinforce that message. We worked very closely with Engineering to ensure our design met all of the performance metrics they had set out.”

A long, 109.3-inch (2,775 mm) wheelbase and wide front/rear tracks are the cornerstones of the ATS’s firmly planted stance, which is enhanced by short overhangs and taut sheet metal that appears to wrap tightly around the tires.

Cadillac’s prominent shield grille is more agile and athletic, featuring active grille shutters that close at certain highway speeds to reduce aerodynamic drag and enhance fuel economy. The center, high mounted stop light (CHMSL) on the rear decklid provides downforce to improve aerodynamic performance.

“When you start a new program, a new architecture, it’s much different than re-skinning something else. The opportunity is both challenging and rewarding,” said Taki Karras, Cadillac ATS exterior design manager. “The ATS has a lot of gesture in the line work and that leads to the overall performance nature.”

The ATS’s clay models and full sheet metal models spent hundreds of hours in wind tunnel testing to reduce wind noise and drag, improve air flow and performance and enhance fuel economy.

A driver-focused interior with integrated technology and crafted materials complements the exterior elements and supports the ATS’s driving experience. Everything from the placement of the pedals to the position of the shifter is designed for effortless and intuitive performance driving. Available performance seats have power-adjustable bolsters to optimize lateral support during high-load cornering

“I think what will surprise people most when they get in the ATS is we’ve given them a beautiful driving environment with plenty of space in what seems like a small exterior,” said Eric Clough, Cadillac interior design director.

Contributing to the interior’s intuitive feel is an instrument panel that wraps into the doors and a center stack in the mid-instrument panel that flows into the center console. LED lighting for the bold gauge cluster enables clear, at-a-glance viewing in all lighting conditions, while ambient lighting accents functional elements of the console and doors.

“When you drive this car, its combination of design, powertrain and engineering and interior design. It’s the entire package,” Boniface said. “This isn’t just another car, it’s a Cadillac.”