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Cool Air, new Cadillac STS-V times

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I have some dyno time scheduled for Saturday, so I wanted to get a current baseline on my 08 Cadillac STS-V.

Racelogic PerformanceBox GPS times:

Speed(mph) Time(s) W/Rollout Dist(f)
10 0.95 0.56 6.34
20 1.64 1.25 21.45
30 2.31 1.92 45.86
40 3.05 2.66 84.29
50 3.94 3.55 143.25
60 4.94 4.55 223.83

New low time today — a 4.55 sec 0-60 mph with rollout, or 4.94 sec w/o rollout.  This was my goal for the V — to get to a solid <5 sec without rollout.  Car had 3/4 tank of fuel and the run not heat soaked.   The STS-V has the Spectre cold air intake and a Corsa axle-back exhaust system.  I weigh 35 lbs more than the standard 160 lbs for the buff magazine journalists who get the great times for car mag tests.    Local fuel is 93 octane E10.  The backup 0-60 run was 4.74/5.13 sec.

The 60′ time was 2.2 sec, which is an improvement from my usual 2.4 sec.  PkAccelG was 0.77G. The 1-2 shift was recorded at 0.4 seconds.

Peak Hp was calculated at 6,371 RPM: [click on the image to zoom, hit back to return]

Peak calculated HP at 6,371 RPM

Calculated HP has steadily run less than expected on this V, but I am not clear why.  It uses the Delivered Torque calculated by the engine at RPM to calculate theoretical HP.  The value is a notional figure and not considered accurate for tuning, but I use it as a relative indicator.  I am also not able to run flat out in 4th gear as on the dyno though.

Same run, peak HP at 65 mph at top of 2nd gear:

Top of 2nd gear at 65 mph

Interesting that boost in 2nd gear was running 10.6 psi vs 8.8 psi at the top of 1st gear.  I do not think this is a tuning issue but may have just been a transient thing.  The boost was trending in the 9s then dips and then peaks at 10.2 psi at the 1-2 shift in the scan.

Due to the low temps, the IAT Advance was actually ADDING timing instead of retarding!

Here is the cold air IAT / IAT2 histogram for the whole test cycle:

No KR anywhere on the run.   PE is commanding AFRs down to 10.5, so that is something to consider.  Safe AFR for a supercharged engine probably up at 11.5 to 11.8 where the engine should make more power.

Atmospheric Conditions:

Atmospheric conditions and effect on HP

 

Taking Cooling Cues from the ZL1

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The May 2012 GM High Tech Performance Magazine has a nice article (not on the website yet)  about the new Chevrolet Camaro ZL1 development.  The ZL1 uses some parts in common with the Cadillac CTS-V, only with the opportunity for the team to tweak a few things.

  • Intercooler pump:  the ZL1 uses the water pump from the Chevrolet Volt — which is super efficient — but runs it at 80W instead of the Volt’s 50W.
  • Dual mode muffler setup
  • Secondary air inlet to the airbox
  • Redesigned intercooler brick with higher water flow rate and higher air flow rate so less pressure drop

Is this the battery cooling pump perhaps:

13579713 PUMP. Drive Motor Battery Cooling. Engine Coolant.
PUMP,DRV MOT BAT COOL. Required: 01

and the Volt Battery cooling radiator is this one:

20925998 RADIATOR. Drive Motor Battery
RADIATOR, DRV MOT BAT COOL. Required: 01For: RC (2011-2011)

Actually, the Volt battery cooling system looks a lot like an intercooler heat exchanger system:

Chevrolet Volt Battery Cooling System

 

The ZL1 is rated for 580 hp instead of the CTS-V’s 556 hp — and based on the improved intercooler work it should be more resistant to heat soak.

2013 Cadillac XTS priced starting at $44,995

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DETROIT –The 2013 Cadillac XTS luxury sedan, Cadillac’s most technologically advanced car yet, will be available at U.S. dealerships later this spring with a starting price of $44,995 including destination.

The all-new XTS is the only car in its class with standard Magnetic Ride Control, the world’s-fastest reacting suspension technology. Also standard and making its debut in the XTS, is CUE, Cadillac’s breakthrough in-vehicle user experience for control and connectivity.

2013 Cadillac XTS.

Three option collections will be offered on the XTS: Luxury, Premium and Platinum. The XTS Platinum model represents the highest level of technology and luxury, including a unique front appearance, wheels and interior colors, materials and trim.  An advanced all-wheel-drive system, using Haldex technology to transfer power front-to-back, and side-to-side along the rear axle, will be offered on all three trim levels above the standard model.

“The all-new XTS redefines our approach to the luxury sedan by combining advanced technology, stunning design and confident performance,” said Don Butler, vice president Cadillac marketing.  “XTS brings new and exclusive technology, while still delivering the space and elegance that is Cadillac’s DNA.”

Cadillac is preparing for the debut of CUE first automotive use of capacitive touch, the technology used by many of today’s best tablets and smartphones.

A new CUE iPad Application, which replicates the center screen that is the hub of the system, is being used to familiarize dealers with the experience as well as provide videos and information. The App will be opened to the public via the App Store in May as the XTS launches.

“We’re taking advantage of the fact that CUE is parallel technology to tablets,” Butler said. “CUE is intuitive, in part because its control and command structure aims to be consistent with popular devices millions of people already use. The App adds to this by literally putting CUE into your hands, even before you can get into the car.”

Cadillac also will use OnStar to provide live assistance to XTS owners for CUE questions.  And Cadillac dealerships will contain certified technology experts to familiarize shoppers and drivers with the system.