Dynotech Reseach has the # on the 2011 Apex

[cacsrx1]

Im sure Yamaha added the EXUP to the XV 1900 (113 cubic inch V-twin)because it needed a low end boost and not because they needed to keep it quiet at a certain speed to pass noise regs. lol.
Four different bikes, of different years, and different brands of exhausts, on different dynos, with 5 things in common. 1. They delete the EXUP device 2. They are louder than stock 3. They match or make more power above 5500rpm than stock 4. They are a 4-2-1 or 2 design not 4-1 5. They are lighter than stock.

Must be snake oil.

 

[stevewithOCD]

Good points by all, but i think we lost the jist of the topic. Most people are saying Yamaha stepped up & gave more peak HP & also increased low end so they are happy. There's no doubt aftermarket will produce more Hp, but most are saying they are happy with the STOCK numbers. There will be some very interesting upgrades coming soon that will keep the talks entertaing at least...

 

[KnappAttack]

I'd be willing to bet you won't see an exhaust system for the new Apex make equal or better than stock midrange without the EXUP. In fact, I bet you won't see an aftermarket pipe with near the powerband of stock that makes more than 3 HP over peak HP without getting really loud. And loud pipes close trails!

Oh and one more thing, I want to see it proven on Dynotech's dyno, same day, same sled testing. Not the pipe manufactures own dyno, where he can manipulate the results.

 

[**sj**]

I'd be willing to bet you won't see an exhaust system for the new Apex make equal or better than stock midrange without the EXUP. In fact, I bet you won't see an aftermarket pipe with near the powerband of stock that makes more than 3 HP over peak HP without getting really loud. And loud pipes close trails!

Oh and one more thing, I want to see it proven on Dynotech's dyno, same day, same sled testing. Not the pipe manufactures own dyno, where he can manipulate the results.

X2 and with using the spikes on the dyno...

 

[kviper]

You are 100% correct Mike! Any one who has the train of thought that with a cvt transmission you don't need the low and mid torque that a bike needs is lost in the snowmobile performance world. The torque band of the four stroke is the reason a four stroke competes so well in the drag racing world!!!!!

 

[KnappAttack]

You are 100% correct Mike! Any one who has the train of thought that with a cvt transmission you don't need the low and mid torque that a bike needs is lost in the snowmobile performance world. The torque band of the four stroke is the reason a four stroke competes so well in the drag racing world!!!!!

Indeed kviper, anyone that competes successfully in drag racing will tell you that a WIDE POWERBAND is what separates the winners from the losers. This includes a motorcycle!

I would say that most of the bike guys are indeed just squids and want to believe the pipe builders dyno charts. So they fall victim to their marketing hype and bolt on that loud pipe thinking they are really going faster, after all they are making more noise so it must be faster!

Now there are cases where some of these aftermarket items really do work, but yes, a great many are indeed snake oil.

It really depends on the state of tune the stock machine is running at as to the gain that can be had. In the case of the new Apex as well as the one it replaces. I'd say good luck on improving it a whole bunch. Yamaha did their homework with this new engine tune.

 

[87gtNOS]

You are 100% correct Mike! Any one who has the train of thought that with a cvt transmission you don't need the low and mid torque that a bike needs is lost in the snowmobile performance world. The torque band of the four stroke is the reason a four stroke competes so well in the drag racing world!!!!!

Again, at WOT...where the DYNO graphs are done....YOUR APEX cvt does not stay at any given RPM other than 10500 for any period of time....like a bike would.

 

[ecopter]

Why all the grief about the EXUP? What it does or doesn't do? What it's purpose supposedly is? In the end, the sled's making more H.P. Heck, I could care less if they stuck a banana up the tail pipe; if it's making more power, great! Hey, shove the whole tree in.....

Some of you guys crack me up. There seem to be a lot of experts out there. Unless you're wearing the boots and have them tucked under a chair at the engineering table in Japan, then it's really all just "talk" and opinion anyway, isn't it? The internet's a funny place.......full of know-it-alls........

jf

 

[kviper]

You are 100% correct Mike! Any one who has the train of thought that with a cvt transmission you don't need the low and mid torque that a bike needs is lost in the snowmobile performance world. The torque band of the four stroke is the reason a four stroke competes so well in the drag racing world!!!!!

Again, at WOT...where the DYNO graphs are done....YOUR APEX cvt does not stay at any given RPM other than 10500 for any period of time....like a bike would.

I will try to explain this to you in a different manner, Maybe you will get it. First off every one gets caught up on horse power. Horse power means very little. A dyno does not measure horse power it measures torque, The horse power number is a simple mathematical equation of torque x rpm divided by 5252 (performed by the dyno computer) and is an indication of what the power is doing at a given RPM. It is all about torque and the wider/fatter the the torque/power band is the better your motor will pull (ability to hold RPM when loaded). It is also referred to as reserve or back up torque. This is why your 150 hp Apex will beat most if not all 150 hp two strokes even though the two stroke has a better HORSE POWER to weight ratio. The EXUP does exactly that with aprox a 2,000 RPM band (wider than previous Apex) verses aprox 500 RPM on a two stroke. It also adds loads of torque at throttle stab and that is what will get you out of the hole first. There is a lot more but i am out of time for now. kviper

 

[**sj**]

IMHO the exup is exactly what the 4 cyl motor was missing... Im not an engineer....but I know clutching and torque is where its at and what that motor was missing down low...and it will have that now...

if they could just lose a few lbs off the sled now!

 

[ZAKSTANG]

kviper pretty much hit it on the head with his post...

 

[Alatalo]

I would say that most of the bike guys are indeed just squids and want to believe the pipe builders dyno charts.

I have got zero interest in looking at the pipe builders dyno charts as I have seen about ten different Supersport, Superstock and Superbike motorcycles (two with full World Championship factory support) on the dyno. In every single case, a well calculated and optimized exhaust system without EXUP (or similar device from other manufacturer) have out-dynoed any exhaust system with EXUP (or similar device from other manufacturer) at every rpm of interest (basically every rpm above idling) and in every possible load case, static as well as dynamic lap simulations. This is the reason why none of the race kit ECUs from any of the motorcycle manufacturers are equipped with connectors for the EXUP valve...
Then again, I am not saying that disconnecting the EXUP valve of the new Apex is going to be a success. Except for being obnoxiously loud and likely creating the all familiar "tach tango", the changed tune is likely going to mess up the fuelling and destroy the power band. But give any of the good exhaust system manufacturers like Akrapovic, Termignoni or Arrows a chance to calculate and optimize something, and I am damn sure they will out-dyno the stock exhaust by quite some margin - at every rpm and in every load case of interest. But what the hell do I know, I am just a squid...

 

[ultimate]

 

[Rash]

Either way...163 hp is getting in my brain...

now i don't know how long i will be able to ride my 2009

 

[mr.pitstop]

I like it.. thats all Im saying.. Can't wait to get my yamacharged 06 on the lake against a stock 2011 and see how we hang...