Updated intercooler hoses, retest hot S3TC heat exchanger

This morning I took the front clip off my STS-V once again to replace the intercooler heat exchanger hoses with Spectre braided stainless sheathed hoses and then retest.

I did a first shake-down test run, then let the car sit and heat soak, then did another 20 min test capture.


The chart shows intake air temperature 2 (IAT2) after the supercharger over time during a 20 min test drive. The spikes on the chart are acceleration runs.
Today’s weather is overcast, with 72F air temperatures, similar to the historical data file for the OEM capture. What this suggests is that the S3TC heat exchanger in series with the OEM heat exchanger acts to lower IAT2s around 10F.  The end of the test was curtailed due to a traffic stackup; I stopped scanning and capturing data to save time on conversion.

Because today’s temps are similar to the historical air temps, I compared today’s run to the historical data without modification.

Overall the new S3TC Heat Exchanger results continue to be good.  The Spectre hoses are on and do appear to have better success at avoiding kinks or crimps than the rubber heater hoses did.

Here is a zoom-in on the acceleration run today, showing the trend for IAT2 vs RPM and Speed.


In this graph we see initially there is actually a decrease in IAT2, as the throttle opens, all the flow goes through Supercharger as opposed to the bypass, and the intercooler is at max cooling. As the supercharger continues to dump heat into the system, the manifold heats up more than the intercooler cooling system can sustain.

Optioning the 2013 Cadillac ATS

The first question for the upcoming 2013 Cadillac ATS is:  do you want the 272hp 2L Turbo 4 — starting at $35,795 — or the 321 hp 3.6L DI V6 starting at $42,090?

The all-new Cadillac ATS navigates through the turns and straightaways at Atlanta Motorsports Park during performance testing Tuesday, May 8, 2012 in Dawsonville, Georgia. The Cadillac ATS is engineered to be the lightest compact luxury sports sedan, reducing weight through the use of advanced materials - but not at the expense of performance. (Photo by Sam Sharpe for Cadillac)

Right behind that choice however — and the 2L Turbo is likely to be the price / performance silver lining  — will you want the 2L Turbo Performance Package (1SJ), or Premium Package (1SL)?

In Cadillac parlance, the Performance Package generally includes the key performance options in an easy selection.  The Premium package however often adds features — at a price — that are desirable even for hard core performance enthusiasts.  There is also a ‘Luxury’ model available (1SG) that combines more luxury oriented features that non-performance Buyers may prefer.

The 2L Turbo Performance package looks like this:

Y42 Performance Package, includes

  • (T4F) HID headlamps with Adaptive Forward Lighting,
  • (GGC) Midnight chrome accented grille,
  • (HD7) Illuminating outside door handles,
  • (JF5) sport alloy pedals,
  • (AHE) performance seats,
  • (A6E) fixed seat back with armrest and pass-through,
  • (ATH) keyless access passive entry,
  • (UDF) Ultrasonic Front Park Assist,
  • (UD7) Ultrasonic Rear Park Assist and
  • (KB7) steering wheel-mounted Paddle Shift Controls (not available with [M3L] 6-speed manual transmission)

and the Premium package adds the full color heads-up display (!), steering wheel paddle controls for the auto trans, FE3 performance suspension, limited slip differential, and Magnetic Ride Control:

Y43 Premium Package, includes

  • (T4F) HID headlamps with Adaptive Forward Lighting,
  • (HD7) illuminating outside door handles,
  • (JF5) sport alloy pedals,
  • (AHE) performance seats,
  • (UV6) full-color head-up display,
  • (KB7) steering wheel-mounted Paddle Shift Controls (not available with [M3L] 6-speed manual transmission),
  • (FE3) performance suspension (not available with [M3L] 6-speed manual transmission),
  • (V03) performance cooling system,
  • (G80) Limited Slip Differential and
  • (F55) Magnetic Ride Control

The Premium package also has navigation standard, while the Performance package has Nav as an option.

Suspensions — generally Cadillac grades suspensions from FE1 to FE3 or FE4 as the capabilities move from standard to highest performance.  The Magnetic Ride suspension on the Premium model is the most desirable setup.

The grill and parking assist items on the Performance Package list but not on the Premium Package list are a bit of a red herring, since they are standard on the Premium Package and part of the Luxury Package:

Y40 Luxury Package, includes (GGC) midnight chrome accented grille, (UDF) Ultrasonic Front Park Assist, (ATH) Keyless Access passive entry and (AM9) split-folding rear seat

The other BIG feature standard on the Premium and optional for the Performance will be the Cadillac User Experience (CUE) system.  The 2L Sport model can be optioned up to include the HUD as well.

Both the Sport and the Premium package get the seating package standard, which adds power memory seats and rearview backup camera:

Y44 Seating Package, includes leather seating surfaces, (AE8) 10-way power driver and front passenger seats including 2-way power lumbar, (A45) Memory Package, (DR2) heated outside power-adjustable mirrors with auto-dimming driver side, (DD8) inside rearview auto-dimming mirror, (UG1) Universal Home Remote, (BTV) Adaptive remote start (not available with [ML3] 6-speed manual transmission), and (UVC) Rearview backup camera

Summary:

How will you option out your Cadillac ATS?  Will you keep it clean and disciplined and stick to the Performance model, or will you write a check for the Cadillac ATS 2L Turbo Premium?

Spectre stainless steel sheathed intercooler hoses

One of the great things about OEM heater systems is that they have hoses exactly bent and shaped the way needed, so that the hose is perfectly formed for the job.  Good advice for aftermarket installations like my intercooler cooling mods is to measure out exactly what type of hose you need, then go look at the big books of existing OEM hoses at an auto parts store and find the one snowflake that is similar to your needs.

Another option is the Spectre stainless steel sheathed heater hose, 39798, which is designed to allow a variety of hose turns without kinking or crimping.

Spectre hoses in their packaging

The hoses I need are 3/4″ inner diameter. These Spectre hoses are rubber hoses with a stainless steel braided sheath around the rubber.  For Spectre 39798 the hoses are 4 ft (48 inches) long.
Here is a shot out of the packaging:

Vanity shot of the hose out of the packaging

The sheathing helps prevent hose crimping. After playing with one of the hoses in various bends I would say it is helpful in resisting but does not eliminate crimping. So I will still need to ensure that the hose routing helps as much as possible to avoid crimping the hoses.