Thread: More boost more power?
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Old Apr 10, 2009 | 12:25 PM
  #30 (permalink)  
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BrianBrave
<--- Huge Horsepower
Joined: Apr 2007
Posts: 3,217
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From: So Cal
Default Re: More boost more power?
Great topic: I would love to know the RPM limit our Supercharges begin to experience diminishing returns so I could graph and plot my engine's performance to see where and if I hit a wall.

I do believe there are diminishing returns ( I understand this concept in an economic point of veiw) but diminishing returns does not mean loss of gain.

Rather then use a lot of words to explain, I made a chart that compares engine RPM with supercharger RPM for both the 178mm and 185mm pulley.

Let's say (cuz I don't really know and it's never been posted on the forum) that our SC'ers hit peak performance at 10,625 RPM's and beyond that will no longer provide the same additional gain in HP per additional increase in RPM then before.

The chart below says that, "Ceteris Paribus", or all things being equal: same driver, same track, same tires, same weather, etc... that at 10,625 SC'r RPM - - The 185 has an advantage over the 178 because it reaches "peak" SC performance about 170 engine RPM's before the 178mm pulley (not very much, but about about 4%).





The next piece of data to look at would be a dyno chart. Not to look at the peak numbers; we know that different dynos, on diifferent days, at different locations, etc....

But to look at the trend line for the HP to see if there's a dead spot where the engine no longer makes HP and find that RPM.

Here's one of my dyno pulls that was performed at the shop Code3 uses to test and report gains from their products.

Bottle_Blown_Blowup-1.jpg



It looks like the 185 makes it greatest percentage gains in HP until about 4,300 engine RPM's and then it's trend line starts to flatten out - but it is still continues to increase HP all the way up to 6,000 RPM.

Works for me...
 
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