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2012 RS3


BradyPPC

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We had a 2012 Roush RS3 dropped off last week for a little bit of work. When the car came to us it was already equipped with a smaller 82mm supercharger pulley and a mail order tune. Everything else on the car was bone stock. We simply swapped out the spark plugs for the correct heat range plug with the proper gap and did a quick retune on the car. Power came up nicely and the car flat hauls!

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5166&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5170&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5176&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5179&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5182&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5185&g2_serialNumber=1

 

http://pickupspluscars.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=5188&g2_serialNumber=1

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Was the mail order tune and smaller pulley on when you had it at Brians?

 

No, it had the stock tune which is not very impressive at all.... Once the pulley and the mail order tune were done there were some issues that prevented the car from being driveable. It pretty much came straight here to get worked out.

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why is it making less power at 12 lbs of boost than at 10 lbs?

 

Think of it in terms of blower rpm rather than boost. On this car the same pulley was used for both runs so the blower rpm was the same and the supercharger would be moving the same amount of air. Boost is simply a measurement of restriction and is measured deep in the intake manifold. With TiVCT there is independant controls for each camshaft and simply moving the cams around will either create or remove a restriction without altering blower speed. On this car moving the cams removed a restriction allowing more cylinder fill, which creates higher cylinder pressures, which makes more power.

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  • 2 weeks later...
What did it run? We were out in it the day before and the clutch pedal was sticking to the floor above about 6600 rpm. It pulled hard, just some shifts were slow cause you had to wait on the pedal to come up from the floor. Definitely needs a clutch upgrade.
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The first 4 or 5 passes I was running my bud that came with me in the 2004 black C5, I was trying not to make him feel so bad and was hitting the brakes @ the 1000 foot for him to catch up,, was running mid 12's.

 

After that he was on the video camera on the wall, ran high 11's and a best of 11.57 @ 123 MPH / 60 ft of 1.802. I was trying to wait and see if they were kicking guys out for no roll cages / harness before I let loose a little. The clutch stuck to the floor alot, and lost momentum,, should see 10's with a new clutch.

 

I probably will not see the 10's though,, I will not go back until the spring & Brady will be doing some work on it over the winter and at that point should be straight into the 9's.

 

For now it is a lot of fun though!

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Think of it in terms of blower rpm rather than boost. On this car the same pulley was used for both runs so the blower rpm was the same and the supercharger would be moving the same amount of air. Boost is simply a measurement of restriction and is measured deep in the intake manifold. With TiVCT there is independant controls for each camshaft and simply moving the cams around will either create or remove a restriction without altering blower speed. On this car moving the cams removed a restriction allowing more cylinder fill, which creates higher cylinder pressures, which makes more power.

 

thanks for the explanation! /me dumb when it comes to supercharges vs. turbos

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thanks for the explanation! /me dumb when it comes to supercharges vs. turbos

 

No problem. It can be confusing. Most cars boost only changes if the blower rpm changes. These cars are completely different. Measured boost can vary just off the cam angles the car is running.

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