what RPM is it normal to see boost start to build at? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 10 Old 05-14-2014, 08:45 AM Thread Starter
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Question what RPM is it normal to see boost start to build at?

Hello all

I recently bought a 2014 Shelby GT500 completely stock, with the track pack and performance pack. While the car is fun to drive and is pretty quick there is one concern/question I have. According to the electronic vacuum/boost gage in the display on the gage cluster I don't seem to be building any boost until about 4000 RPM, is this normal? I would have thought a positive displacement blower would be showing boost at a much lower RPM

Also is there anything I can do to make the blower louder? I can barely hear it when driving

Any info would be appreciated


Thanks

Ron

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post #2 of 10 Old 05-14-2014, 05:31 PM
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I have a 99 supercharged cobra and a 13 shelby. I think the boost occurs more under a load relationship rather than a set rpm. The vacuum/boost gauge is as much a load meter as a boost gauge. Run your car down to a slower than normal speed for 4th gear and start a progressive advance of the throttle. I am sure you will notice the gauge will go into boost very quickly. Think of it as a balancing act between how much air your engine is moving, rpm relative, and the amount of pressure the supercharger makes.


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post #3 of 10 Old 05-15-2014, 12:44 PM
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Railroad, is correct, I believe. I also have a 2014 and the boost can come in at a low rpm and sometimes high depending on the driving conditions.
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post #4 of 10 Old 05-15-2014, 06:59 PM
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Yup..everyone is correct

"Boost" or a vacuum measurement is really controlled by load here (versus rpm) in these cars. Even a centrifugal which is really tagged for RPM in all ways of sorts will show boost with load only.

On my '13 Shelby it is always in boost (because boost=happy-happy time to me.
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post #5 of 10 Old 08-03-2014, 10:10 AM
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Quote:
Originally Posted by 2NAZTY View Post
Hello all

I recently bought a 2014 Shelby GT500 completely stock, with the track pack and performance pack. While the car is fun to drive and is pretty quick there is one concern/question I have. According to the electronic vacuum/boost gage in the display on the gage cluster I don't seem to be building any boost until about 4000 RPM, is this normal? I would have thought a positive displacement blower would be showing boost at a much lower RPM

Also is there anything I can do to make the blower louder? I can barely hear it when driving

Any info would be appreciated


Thanks

Ron
switch from that roots SC to a Twin Screw, and you will see the difference internal compression can make.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #6 of 10 Old 08-06-2014, 12:42 PM
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Also is there anything I can do to make the blower louder? I can barely hear it when driving

Any info would be appreciated


Thanks

Ron
Pulley swap and fill in the silencer holes on the bottom of the blower. You'll definitely hear it then.

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post #7 of 10 Old 08-07-2014, 10:47 AM
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The 13-14 Shelby's have to be driven a certain amount of miles before they will make full boost. That is completely normal. Read your owners manual and just keep driving it

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post #8 of 10 Old 08-07-2014, 10:11 PM
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get a compressor on there instead of a blower, then it will make the right noise

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #9 of 10 Old 08-14-2014, 12:28 PM
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get a compressor on there instead of a blower, then it will make the right noise
They come with A/C from the factory. But if they whine you have problems.

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GT40 306 with a few bolt ons and in the 12's
'01 Lightning
#6257 of 6381 Bolt ons, pulleys, and tuned.
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post #10 of 10 Old 10-22-2014, 07:43 AM
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once you're in gear and stomp on it, it'll build boost at like, 1500rpm. lol mine does at least. Pegs 15psi in a fraction of a second


edit: mods are intake, pulley, off road H, and tune.

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