D&D Fat Cats

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Dec 31, 2020 | 04:43 PM

#31

Ridetothehill

Road Captain

Joined: Jan 2019

Posts: 607

Likes: 143

From: Hilltown

Quote:

Originally Posted by strych9

My dip was caused from the Rinehart Slimline Duals I was running. The D&D Billet Cat fixed it.

Huge difference between the two sytems. Glad to hear that your dip got straightened out. I really like your current setup.

Dec 31, 2020 | 06:42 PM

#32

heavymetalthunder

Seasoned HDF Member

Joined: Jan 2008

Posts: 5,202

Likes: 792

From: Kansas City, Missouri

Quote:

Originally Posted by 09 YELLOWBIRD

Without a doubt those V&H Power duals are not helping. D&D Headers are a good option with a crowd that loves them.

But may I suggest another one that is the silent one out of the bunch w/ proven performance. Fullsac MX-Pipe.

Note: You can use your stock head shields and add Fullsac Baffles of choice with your CVO pipes. Done & much less expensive.

YB

The fullsac setup gives great torque and power. I pulled the FatCat off my 2011 SERGU because it was just to loud for my ears. I put on the Fullsac x pipe with CVO mufflers and his 2.0 baffles. Bike ran as good and with a lot less noise. Seat of the pants dyno. I could not tell the difference, I second This Idea. Brilliant

Jan 1, 2021 | 01:52 AM

#33

RiderX

Thread Starter

Road Master

Joined: Apr 2007

Posts: 1,021

Likes: 304

From: Providence Forge, VA

Quote:

Originally Posted by Ridetothehill

Alternatively, a muffler small enough to prevent reversion, yet large enough to provide sufficient flow would be the answer. This is the answer that Fuel Motto offers; and, in my opinion, the best one. Fuel Moto does know what they are talking about and have invested into much research. They wont steer you wrong. I believe that their jackpot slip-ons will straighten out your dip.

From an aesthetics point of view, the Vance & Hines definitely look a lot better, IMHO, than the D&D Billet Cat head pipes. if replacing my mufflers with a slip-on from Fuel Moto, or any vendor, will take care of my dip and provide just as much low end torque as a complete exhaust replacement, I am all for it. That would allow me to continue to enjoy the look of the V&H headers and still have the performance I am looking for. The only remaining question is... What am I losing, if anything, by only replacing the mufflers as opposed to an entire new exhaust.

I know I have asked this question before and I other than seeing a Dyno sheet with Jackpot mufflers and the V&H Power Duals, I am not sure how well anyone can answer that question. I am happy with the peak torque of my current Dyno tune but I am not happy with the dip. If the dip can be resolved, the torque curve remain smooth and continuous (as it is now), and peak torque and HP be at least the same as it now, I would be a happy camper; especially if I could keep my V&H Power Duals - they are nice looking head pipes.

What do you guys think?

Jan 2, 2021 | 09:38 AM

#34

Senecagreen

Road Captain

Joined: Sep 2014

Posts: 629

Likes: 447

From: Oklahoma

Quote:

Originally Posted by RiderX

I have posted my Dyno sheet below so you can see the weird dip that is occurring with my current setup. Do you see that odd torque dip it does between 1800-2500 RPMs? This is what I am looking to correct.

Changing exhaust might flatten the dip out a little but that looks like camshaft profile choice...It is normal on a lot of bikes to see a dip in the torque curve before it ramps up . I doubt you even notice it riding. If you like the exhaust you have save your money.

But since you know its there it troubles you. Once I say the coleslaw smells like minnows it's hard to get that out of your mind.

Jan 2, 2021 | 11:06 AM

#35

Ridetothehill

Road Captain

Joined: Jan 2019

Posts: 607

Likes: 143

From: Hilltown

Jan 2, 2021 | 03:35 PM

#36

RiderX

Thread Starter

Road Master

Joined: Apr 2007

Posts: 1,021

Likes: 304

From: Providence Forge, VA

Quote:

Originally Posted by Senecagreen

Is that dip really normal? I admit, I am by no means a Dyno sheet expert by any stretch of the imagination. However, I do not recall seeing my Dyno sheets with that kind of dip. If you mean by cam profile choice the fact that it is a Red Shift 468, that cam is specifically designed to generate a lot of torque at lower RPMs. If you by cam profile choice you mean a choice made by my Dyno guy, he said this is normal for those mufflers. He did say that by replacing the slip-ons I would address it somewhat but to really fix it, I should go with a new exhaust like the D&D Billet Cat.

Your point is well taken in regards to the coleslaw analogy. Although, I must say, I do notice it when riding. If feels exactly like the chart indicates - starts out great then kind of stops pulling for a second, or two, or three, and then the torque kicks back in again. I think at the very least, I am going to replace the mufflers. I truly do love the look of the Vance & Hines Power Duals.