Excell exhaust

[Alatalo]

Get back to topic, please !

Has anybody used the excell exhaust and if so did you notice any performance gains. One thing for sure is it sounds great!!!

I have got the Excell exhaust system on my 2006 RX Warrior.
I can not say that I noticed much of a difference in my clutching rpm. Because of this I would assume that the peak power of the Excell exhaust system is very close to the peak power of the stock exhaust system. Difficult to say anything about the mid-rpm power or the power band (you would have to run them back-to-back within couple of minutes to say anything about this).
Though, the Excell exhaust system is 4kg / 9lbs less than the stock exhaust system. This, combined with the clean looks, is reason enough for me...

 

[monker]

So let's get this straight, are you now sticking up for monker?? Can't he disagree with me on his own?

I'm not going to argue. I posted my results for everyone to see, make your own opinions. I replied to the original poster and answered his questions with a PM. I'm on this site to help people where I can, get help when I need to, and learn a little bit inbetween.

 

[Alatalo]

Wow, this must be a new record !
Almost 30 replies and about five that actually answers the question...

 

[87gtNOS]

Wow, this must be a new record !
Almost 30 replies and about five that actually answers the question...

You see, exhaust takes time to change on these sleds, so it's not like you can do back to back runs.
According to the supplied dyno charts...the first chart is corrected up over 10 hp, the second chart only 4hp. Very strange..... Similar FP and air temps....
We can pick this apart further, but again, these dyno sessions aren't the same day....

Motorcycle exhaust generally gains 10hp on most bikes with similar engines, and I'd bet these gains are mainly found in the midrange, and further cleaned up via jetting and PCM.

Funny thing about sleds, is we don't drive at 4-5000 rpm, we want our gains to be at WOT! Bang the trottle open and it goes WOT rpms! This is were the gains aren't very significant. Mostly noise! If it's making 4 hp more in the mid, and you compare that to stock, we could also contribute that to manufacturing tolerances..some sleds stock may have that 4 hp! And then again, so you have 4 hp at 6000 rpm, you hammer it and now you are 10500 and only have 1 more hp perhaps...how is that any better?

My conclusion is the pipe just makes more noise....just wait until your stock one gets broken in more!!

 

[Yamahnator]

Pipe doesn't "just make more noise." What I like about the Excell is that there are actually dyno numbers. Other exhausts just throw a number out there. It also saves the most weight out of any exhaust, even though we are talking lb's. Still they add up if you are doing little things to save weight. I know the owner, had heard his reputation around my area and it was always very good. Even riders of other makes know of him and have good things to say. I got to meet him this year and his reputation is correct. Always there to help with questions and really up front about his information.

You wanted a real worl example. All I have is the pipe on my sled. No clutching, or anything else yet. I was cleaning up on the resovoir on my second to last ride. Excell was there that day earlier than I was. The guys that were radaring said he was the fastest sled out there that day. He was beating stock Apex's as well. The pipe does add performance. Proven performance, not just guesstimated like half the other pipes out there.

 

[87gtNOS]

Pipe doesn't "just make more noise." What I like about the Excell is that there are actually dyno numbers. Other exhausts just throw a number out there. It also saves the most weight out of any exhaust, even though we are talking lb's. Still they add up if you are doing little things to save weight. I know the owner, had heard his reputation around my area and it was always very good. Even riders of other makes know of him and have good things to say. I got to meet him this year and his reputation is correct. Always there to help with questions and really up front about his information.

You wanted a real worl example. All I have is the pipe on my sled. No clutching, or anything else yet. I was cleaning up on the resovoir on my second to last ride. Excell was there that day earlier than I was. The guys that were radaring said he was the fastest sled out there that day. He was beating stock Apex's as well. The pipe does add performance. Proven performance, not just guesstimated like half the other pipes out there.

I totally agree on the weight savings. However I am still skeptical about your findings with the real world....these are not experienced by you, just heresay. (no offense to Excell)(see that Dirk) But ofcourse Excell's own Apex is gonna be faster...was it 1mph faster or 5mph faster on the radar gun?

It looks like it is gonna be very hard to better the stock system, other than weight savings. Like said by Yamahnator, it is nice to actually see dyno sheets, basically showing no losses...but some strange correction factors??!!

Will you see an exhasut on my Apex next....most likely if I dont turbo it....

 

[Swiss Sledder]

Guys, lets stay on topic and not hijack the guys threads. Feel free to duke out via PM's, but stay on topic in the thread. Prior posts not related this thread are being removed.

 

[Alatalo]

You see, exhaust takes time to change on these sleds, so it's not like you can do back to back runs.

If your modification does not change the rpm or the powerband too much, just test riding the sled in a proper back-to-back test is a very good indication about power:
Does the shift rpm increase ? You likely gained top end power.
Does the shift rpm decrease ? You likely lost top end power.
Does the backshift feel quicker ? You likely gained midrange power.
Does the backshift feel sluggish ? You likely lost midrange power.

As I said before, I have not made a back-to-back test and because of that I can not really say too much. Between two different days the shift rpm did not change and also the backshift did not feel very different.

If you really want to go for it, a proper back-to-back test is for sure possible. After wrenching on couple of these sleds I estimate that the essential parts of the exhaust system can be changed in less than one hour.

The best way is of course to make the proper back-to-back test on a proper dyno.

And then again, so you have 4 hp at 6000 rpm, you hammer it and now you are 10500 and only have 1 more hp perhaps...how is that any better?

Anyone concerned about backshift/downshift and corner-to-corner performance on twisty trails will benefit from more midrange horsepower.

 

[Alatalo]

As I said before, the weight savings and the clean looks were the main reasons for me to choose the Excell exhaust system. I honestly did not expect any horsepower gain (I work on superbikes on a daily basis and silencer changes that does not require a serious remapping does not usually show any change in power output).
As an added bonus the fit and finish of the Excell exhaust system is good and the service from Excell Motorsports is great with quick shipping (important to us non-americans).

 

[monker]

According to the supplied dyno charts...the first chart is corrected up over 10 hp, the second chart only 4hp. Very strange..... Similar FP and air temps....
We can pick this apart further, but again, these dyno sessions aren't the same day....

Where did you see correction factors? I can't find them.

Also, these dyno runs were about 20 minutes apart.

 

[BlueMax]

The BSFC on the dyno runs was incorrect and were calculated from peak HP due to a computer malfunction at Dynotech. You can not check the correction factors in this case. The runs were made less than an hour apart.

To answer the question of what difference can be made. Here is a theoretical scenario. If you add 2 HP (on average) to a 147 HP Apex you will reduce your 1/4 mile time by .07 seconds or at the 118 MPH (monker was running) that is 12 feet or a little more than 1 sled length.

Finally, a tenth of a second on a stock sled is quite a bit. These stock sleds run very consistent times at the drag strip compared to any type of racing machine. I know several asphalt sled racers that dominate their ET division at the local drag strip. It really ticks off the motorcycle riders and the guys that have a lot of money invested in their 10 second drag car.

Hope this helps.

 

[legend]

I think 87gtnos has way to much time on his hands he is starting to sound like 456 racing who really gives a #*$&@ as long as it makes power and looks good then what do you wont stone 88 knows his #*$&@

 

[87gtNOS]

I think 87gtnos has way to much time on his hands he is starting to sound like 456 racing who really gives a poop as long as it makes power and looks good then what do you wont stone 88 knows his poop

the 'legend' is buying the beers the next time we meet!!

 

[legend]

I cant bye all the beer we have to bring stan but he could be singing autographs

 

[Yamahnator]

Pipe doesn't "just make more noise." What I like about the Excell is that there are actually dyno numbers. Other exhausts just throw a number out there. It also saves the most weight out of any exhaust, even though we are talking lb's. Still they add up if you are doing little things to save weight. I know the owner, had heard his reputation around my area and it was always very good. Even riders of other makes know of him and have good things to say. I got to meet him this year and his reputation is correct. Always there to help with questions and really up front about his information.

You wanted a real worl example. All I have is the pipe on my sled. No clutching, or anything else yet. I was cleaning up on the resovoir on my second to last ride. Excell was there that day earlier than I was. The guys that were radaring said he was the fastest sled out there that day. He was beating stock Apex's as well. The pipe does add performance. Proven performance, not just guesstimated like half the other pipes out there.

I totally agree on the weight savings. However I am still skeptical about your findings with the real world....these are not experienced by you, just heresay. (no offense to Excell)(see that Dirk) But ofcourse Excell's own Apex is gonna be faster...was it 1mph faster or 5mph faster on the radar gun?

It looks like it is gonna be very hard to better the stock system, other than weight savings. Like said by Yamahnator, it is nice to actually see dyno sheets, basically showing no losses...but some strange correction factors??!!

Will you see an exhasut on my Apex next....most likely if I dont turbo it....

Many things change with different conditions. But this isn't "just hearsay" as you are insinuating. Not only he told me but guys that don't know who he is and that I've met before (the ones radaring) told me. Perhaps you'd have a point if it were only the person who makes the pipe saying this.

Add in his reputation as a straight shooter around this area and its more believable than not.