Shelby GT-500

Super Charger Low Temperature Cooling Loop

Low Temperature Cooling LoopRoush Power Train Systems Engineering has been tasked to devise a production solution world wide for extended driving at a constant Boost level .

Ambient temperature range:

Test #1 98 fTest #2 110 f Test #3 120 f

(series of ten sessions would be conducted at each test temperature)

Duty cycle, Road load 0 % grade and max speed 155+mph. Sign off requirements

Engine oil temp. not to exceed 305 f Intermittent 280 f ExtendedTransmission temp. not to exceed 300 f Intermittent 280 f ExtendedAir Charge Temperature ( ACT 2 ) 180 f Extended

Low Temperature Cooling LoopProblem - High ACT 2 at boost levels > 3psi. :

Shelby GT 500 to achieve / maintain (ACT 2) temperatures of 180 deg. f Or less during extended boost levels of 8 PSI for 10 minutes .

Two row 19mm tube design was chosen over the single 24 mm tube design.

Coolant Pump would be carry over 4 GPM.

Carry over pump control logic for pump on to pump off set points.

Mounting locations would be carry over from previous years

PROBLEM / REASON FOR TESTING:

Investigate a foaming problem with the 50/50 Glycol during the first minutes of testing. ( see graph during the first 170 seconds )

Low Temperature Cooling Loop• Testing Requirements

• Road Load 0% grade:

• Precondition for 20 minutes at 85 mph to stabilize coolant and running gear temperatures.

• Drop speed to 65 mph and apply dynamometer load to exercise

• Supercharger to 8 PSIG. Boost and maintain for 10 minutes

• Air Charge Temperature (ACT 2) not to exceed 180 deg °f.

• NOTE: Super Charger - Low Temperature Cooling Loop is also commonly named “pre-intercooler”.

Low Temperature Cooling LoopEvaluation steps:

• Contact coolant suppliers and inquire about a coolant or additive package that would curtail the foaming issue and have better heat transfer capability. A low ambient was deemed not a requirement as this would be a moderate to high temperature package only.

• SynMax Lubricants (Water Kooler), Competitive Coolant Additive Products & Prestone (50/50 Glycol premix) all supplied chemical fluids for evaluation.

Low Temperature Cooling LoopEvaluation Steps:

• Three series of ten tests with each product at the atmospheric inlet temperatures of:

Test #1: 98 deg.°f Test #2: 110 deg.°f Test #3 120 deg.°f

• A larger non production degas bottle was chosen for testing after the first ten were completed as all the products tested exhibited a foaming issue.

• After Final Test #3 120 deg °f ( ten session completed) the Coolant fluid that showed little to no foam was the Water Kooler from Synmax Lubricants.

• Synmax Water Kooler also showed a better heat transfer rate than the 50/50 glycol mixture.

• Expectation was that Synmax Water Kooler would be closer than 20+ deg.°f cooler which was measured and achieved.

Low Temperature Cooling Loop• The following graph (s) shows (Delta-T) performance • Delta –T performance is the average difference between the inlet and outlet temperatures• Higher (Delta-T ) factor = Greater Cooling Effect and Efficiency

• Synmax Water Kooler Concentrate with purified / distilled water ( 100 PREMIX )INLET- 163.8 deg °f / OUTLET 129.8 deg.°f Average delta T (inlet- outlet ) 34.31 deg.°f

• NOTE: Synmax Water Kooler Product - performed best as compared to all others tested.

• Prestone -Glycol 50/50 Mixture INLET- 160.7 deg °f / OUTLET 145.4 deg.°f Average delta T (inlet- outlet ) 15.03 deg.°f

50/50 Vs water Kooler

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Low Temperature Cooling Loop50/50 Vs water Kooler

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Low Temperature Cooling Loop• Synmax Water Kooler / Distilled Water (100% Premix)

• Air speed at core face 4 m/s ( Pre-Intercooler - Front of Radiator )

• Average air temp. 120.9 deg.°f

• Average coolant inlet temp. 163.8 deg.°f

• Average coolant outlet temp. 129.5 deg.°f

• Average Delta-T (inlet- outlet ) 34.31 deg.°f

Low Temperature Cooling Loopwater kooler Delta T

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Low Temperature Cooling Loop• 50/50 Glycol & Pure Water

• Air speed at core face 4 m/s ( Pre-Intercooler - Front of Radiator )

• Average air temp. 120.4 deg.°f

• Average coolant inlet temp. 160.7 deg.°f

• Average coolant outlet temp. 145.4 deg.°f

• Average Delta-T (inlet- outlet ) 15.03 deg.°f

Low Temperature Cooling Loop50/50 Glycol and water

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Low Temperature Cooling Loop• Synmax Water Kooler Performance Summary

• Super Charger Intercooler (engine)• Pre-Intercooler in front of Radiator

(Lower Temperature Cooling Loop)

• Data & Overall Performance Close to Radiator Coolant System

• Synmax Water Kooler showed Heat Transfer improvement (15%-20%)As Compared to 50/50 Glycol andOther competitive coolant products.

• Resulting in 20 deg.°f Lower Temps.

Shelby GT-500

Super Charger Low Temperature Cooling Loop

Presentation- END.