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Author Topic: Dyno test. 2.25 vs 2.0 core  (Read 1536 times)

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Fullsac Performance

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Dyno test. 2.25 vs 2.0 core
« on: September 21, 2008, 10:38:18 PM »
Everybody has heard the theory. More back pressure for bottom end torque. And less back pressure for top end HP.
Right? Sounds logical. I spent my Sunday in the dyno room testing exhaust. Heres a back to back dyno test done today on a 96" Bagger with a 2 into 1 exhaust. The only difference is the diameter of the baffle in the muffler. 2.0 VS 2.25. Lets see who can quess what baffle goes with each dyno run.
Ignore the numbers. Look at the torque curve at 3500 RPM. There is a huge difference!

Steve
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Re: Dyno test. 2.25 vs 2.0 core
« Reply #1 on: September 21, 2008, 10:56:21 PM »


OK

Don't keep us guessing.

Tell us the larger baffles produced the larger torque!

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Re: Dyno test. 2.25 vs 2.0 core
« Reply #2 on: September 21, 2008, 11:23:21 PM »
I'll be the one to make a fool out of my self,

i say the 2.0(smaller one)made the most torque


jon
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Re: Dyno test. 2.25 vs 2.0 core
« Reply #3 on: September 21, 2008, 11:38:10 PM »
 I did mention the pipe is a 2 into 1. I spent most of Saturday splicing it together. Other specs, Equal length 1 5/8 straight 34" primaries. Merge collector, 1.875 choke. I was shooting for torque with this one. It didn't disappoint.

SG
« Last Edit: September 22, 2008, 10:10:59 AM by Fullsac Perf »
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Re: Dyno test. 2.25 vs 2.0 core
« Reply #4 on: September 22, 2008, 10:06:15 AM »
Well I can see the suspense is killing everyone.
Needless to say, the larger core killed the smaller one in the torque contest yet gained no top end HP.
So much for theories.
Unfortunately the large core also won the noise contest. My ears are still ringing.
So now the real challenge. How to quiet it down with out loosing power?
The testing continues.

SG
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skyhook

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Re: Dyno test. 2.25 vs 2.0 core
« Reply #5 on: September 22, 2008, 09:48:25 PM »
great comparo steve...the smaller core torque curve looks a lot like a typical fatcat midrange dip...thanks for posting!
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Banana man

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Re: Dyno test. 2.25 vs 2.0 core
« Reply #6 on: September 22, 2008, 10:28:06 PM »
Gotta love a guy who will do product R&D on this site. Now we can
see and keep up with the progress. This is good stuff!!!!!

Now if we could just get the moco to give us a web cam in the R&D dept.......
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Re: Dyno test. 2.25 vs 2.0 core
« Reply #7 on: September 23, 2008, 08:55:17 AM »
Quote from: Banana man on September 22, 2008, 10:28:06 PM
Now if we could just get the moco to give us a web cam in the R&D dept.......

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