I know you're all sick of discussing exhausts. But...
Posted March 13, 2000 - 07:27 AM
Right now I have a 1999 WR400 with the stock exhaust system. I run it without the baffle which seems to be basically an open pipe. As you all know, it's LOUD! But it runs GREAT!
I also have a Vortip exhaust insert which I hate! Although it is very quiet, it TOTALLY eliminates any low end torque which is what I need most!
Over the weekend, I took a hacksaw to my Vortip thinking that if I cut off the internals, I would be left with a slightly smaller openening than stock with a turned down tip that might just reduce the noise somewhat. I was right! It is still pretty loud but the hacked up internals takes the sharp bite off the exhaust note. It sounds real nice! So, I took my bike and the newly modified (hacked up) Vortip to a test field near my house. Although it is much better than the stock Vortip power wise and sounds great, it still slightly reduces low end torque. I rode with the Vortip, without, with, without and came to that obvious conclusion.
Am I fooling myself here? If I reduce noise with ANY after market pipe, won't I also be doing it at the expense of power? How can this not be?
More restriction = less power = less noise?
If I could have the perfect exhaust it would:
1) Allow me to keep the awesome middle and upper range I have with my WR w/ YZ timing.
2) Give me a little more low end torque.
3) Be slightly quieter than the stock open pipe (about like my modified Vortip would be nice since it takes the edge off the open pipe sound)
Does this pipe exist? Or does it only exist in the land of marketting and magazine adds?
I've considered the White Bros. e-series. But, it seems to me like the disk system, no matter how many disks are in place, would baffle the exhaust and cause blockage. So, I'm guessing it wouldn't run as good as my stock pipe. Plus, I'm not sure if I like the disk type system since it seems to burn plastic side plates.
I've considered the new Big Gun SDS. But, first I can't find anyone that has used it. Second, I'm sure it's about as loud as my stock set up with no way to temporarily quiet it when riding around my neighborhood like I have now. And third, I would think that second head pipe may add some weight?
I'm not convinced that he FMF really adds much performance over stock with open pipes and it's only BARELY quieter than stock (Dougie has one).
The Yoshi pipe seems to be more of a high end booster and that's not what I need.
Posted March 13, 2000 - 10:49 PM
Posted March 13, 2000 - 11:46 AM
This is such an exhausting subject!! You can always be like me and bide your time until Dirt Rider does an evaluation on FMF's Power Core IV-2 with the Power Bomb Header. I too require as quiet an exhaust as possible. After pulling my pipe's end cap resulting in an orgasm on the first ten feet I rode (and washing my leathers afterword! ), I cannot ride the bike w/ stock exhaust, even though I am forced to. I am just sitting and waiting Pal. It doesn't hurt as much now that we have ten inches of fresh snow on the ground. One week ago, it was 60F, now it's 34F.
Biding my time...biding my time...
[This message has been edited by Kevin in New Hampshire (edited 03-13-2000).]
Posted March 13, 2000 - 11:53 AM
Unless some magazine does an exhaust test where each exhaust is weighed, dyno'ed and Db's measured you don't really know.
Everybody that buys a product wants to confirm that they made the right decision by telling you that you should buy the pipe they bought. This is just human nature.
With this in mind, I will tell you about my experience with the DSP pipe and tapered header. My first guess is that it is made by Yoshimura, I am not sure if this is true, Moto-Greg mentioned it and it looks very much the same. As a side note Moto-greg uses a e-series (I think) and I had the good fortune to ride with Moto-Greg about 4 weeks ago. He may be able to tell you how loud he thought my pipe was compared to his. Just another opinion
The pipe is a straight through design, no restrictions.
I was pleasantly surpised by the noise level. Maybe I was expecting the worst, but it appears that the pipe is significantly quieter than the stock exhaust without baffle. With no Db meter I will just say that it sounds about 70-80% as loud as stock exhaust without baffle. This is coming from a person that hates most aftermarket exhausts because they are too loud. My 97 YZF1000 still has a stock exhaust and I will keep it that way. I will say that the sound is somewhat a Dr. Jekle and Mr. Hyde sound. I can cruise through the neighborhood quietly if the throttle is used judiciously, but if I wack the throttle, it does have a loud bark. But at idle and low throttle settings it is relatively quite. My personal opinion is that it has a great sound.
Regarding the powerband, torque down low is not a problem. No mater how slow I lug the engine, as long as the motor is still spinning, I can crank on the throttle and the engine barks to life, with globs of torque. (This could be as much a result of my bike being a 2000 model - different carb). There isn't the slightest hint of peaky-ness
Regarding fit and finish and cost. The hole setup cost me $400. I understand the titanium is more costly. The weight savings is huge. The hole unit probably doesn't weigh more than 2 or 3 pounds, header and all. The stock unit is a boat anchor, maybe about 12 pounds, just a guess.
The fit through the frame area is tight since the header diameter is large at that point. Everything clears with one or two mm of clearance in every direction.
The unit I have is a spark arrestor type. This is a plus for me. I can't see the screen causing any reduction in flow. The power pulses literally make a clapping sound on my hand when the motor is idling.
The DSP pipe is the unit that the factory racing team uses.
Would I buy it again, yes. Is there another pipe out there that is as good or better. I am sure that all of the pipes are good quality peices. It is just a question of which one suits you. Did I evaluate any other exhausts before I bought, no.
Hopefully you will have the opportunity to see all of the pipes you are considering side by side and hear them side by side.
Hey if you really get desparate, I have a phone in the garage and can start the bike so you can hear it. Then you can get us all together. Put one of us on call waiting and switch back and forth between different bikes. Just a thought.
Posted March 13, 2000 - 03:35 PM
Posted March 13, 2000 - 04:59 PM
Clark has tried every available exhaust on his bike andI think was selling what he did not want to keep...check w/him.
Posted March 13, 2000 - 05:42 PM
The top performer was Big Gun followed by the FMF combo. I went with FMF becuase it was way cheaper. The article had power curves and dBs listed for many pipes.
This reminds me, I was supposed to go to the library and copy them for someone out there. I think you were from Indiana. I'm really sorry. If you still want the info, please let me know and I will see if they still have the back issue.
Dougie, '99 WR400
Mods: YZ timing, Race Tech Suspension, FMF PC IV, FMF Hi FLo Moto, YZ seat, IMS 3.3 tank, One Industries Graphics
Posted April 17, 2000 - 05:52 AM
Anyone have any input on whether this is marketing fluff or a real step forward in muzzling thumpers?
Doug, I'd love the info, if you still have it around. Fax 303-708-9558
Posted April 17, 2000 - 07:23 AM
About the air box lid removal making a difference or not debate, I was one of those "it won't make a difference" guys until I installed the new exhaust system. I had problems while trying to get my jetting dialed. Way too rich with the recommended jets. John in Long Beach convinced me to remove the lid and the thing turned into a monster. Thanks John!
YZ Timing spec
180 main, 48 pilot, 2.2 turns out
DSP SS Non-Tapered w/ SA
15 tooth c/s sprocket
Pro-Tapers & Scott's Crown
Elevation Range & Average Temp: 3500 - 7000 feet at 75 degrees
Terrain: 60% Desert 40% Mountain Single Track
Range with Stock Fuel Tank: Reserve @ 102 miles
Fun Factor: Off the Scale
Posted April 17, 2000 - 11:29 AM
The exhaust is $410 + shipping + $96 for the spark arrester. And that still may not be quiet enough so I'd have to add a quieter insert for even more $$. That's well over half what a full exhaust with titanium can cost me for my '98 VFR!
Posted April 17, 2000 - 01:12 PM
I have the DSP with a tapered header on a 2000wr.
I drove a friends 2000 YZ426 and his bike didn't feel any faster.
Loads of power, and quieter than an FMF PCIV, and quieter than stock without baffle.
The new White Bros "S ?" series looks just like the DSP. Is it the same.
Posted April 17, 2000 - 01:22 PM
Posted April 17, 2000 - 02:40 PM
Posted April 17, 2000 - 04:40 PM
'92 GSXR 7/11
Visit my photo album AT YOUR OWN RISK!! My photo album
Anyone here a sportbike fan also? Then visit us here at www.insanespeed.com
Posted April 17, 2000 - 06:23 PM
1. Buy an automotive 1 3/4"-90 degree exhaust bend. The size is important; it fits perfectly over a sleeve inside the end cap.
2. With the muffler and end cap on the bike, slip the female end into the muffler end cap until it stops, angling the bend down.
3. Through the original insert screw hole in the end cap, drill a small hole into the extension Install a short self tapping sheet metal screw.
4. Using a hacksaw, cut off the new extension to suit your preference of down angle. Cut square to the pipe centerline at the cutting plane. Debur the cut with a file and emery paper. My turndown extended about 3" from the end cap.
5. Seal the extension outer diameter to the muffler cap with black silicone.
6. Raddle-can paint the extension and sealer black. Not required to be heat rated.
This install looked good and did the following for my bike:
A. Provided water protection to the upturned stock cap opening.
B. Significantly lowered the sound level at low throttle.
C. Preserved all the power characteristics of the open WR end cap. This is true for all the "dial in" combinations discussed in this forum.
D. Leaves the spark arrester screen in place.
Posted April 18, 2000 - 12:54 AM
Posted April 18, 2000 - 10:00 AM
From their web site:
Competition core-98-100 db (No power loss) Quiet Core- 96-97 db (No power loss) Super Quiet Core- 93-94 db (Slight power loss with this core)
With the spark arrestor they list the Race Core at 96 db and the Quiet Core at 93 db.
[This message has been edited by JamesD (edited 04-18-2000).]