| Author | Message | ||
     Cowboytutt |
Well I was probably one of the first American's here in the States to purchase the velocity stacks from Twin Motorcycles for my 09 CR. I happened to be online on Badweb the night they were announced to be available. To be honest, they were a late night impulse buy after having a few beers. Later, as I read the articles on TM's website about them, the gains seemed to all be made with an open airbox and the Jardine (IIRC) exhaust whose performance is not so legendary. So, with all the gains made by the Barker exhaust and Erik Buell Racing ECM, I was not really expecting very much. So, the 'stacks have sat on my table for two months awaiting installation. Well, I finally got caught up on some things and it was a beautiful 70 degree Autumn day here in Ukiah, CA and I decided to get the bike from storage, ride it home, and finally install the 'stacks. The installation is an easy one and can be done with simple tools and inexperienced hands. Just remove the upper and lower airbox(s) and pull the retaining springs that hold the stock plastic inserts onto the stock butterfly intakes. The hardest part is getting the springs back on with the new velocity stacks. It can be done with your fingers and a flat blade screw driver. When putting everything back together, just be sure to route the throttle cable down low in-between the frame rails and put the vacuum tube back up into the lower airbox, otherwise it can bind either the cable or the throttle linkage when you tighten down the lower airbox. I went over to Hwy 253 which is my favorite test road to sample the combination of parts. I immediately noticed how at very slight open throttle at 6000 rpm, the motor just pulled all the way up through the power band very eagerly. I remember thinking, “I don't remember noticing that before”. After some saddle time, there could be no doubt, the engine responsiveness and probably HP was much improved starting about 6k. There was even a slight improvement at 5k but the stacks really shine in the upper half of the power-band. It pulls like an in-line 4 when its “on the cam” now. There is also a delightful intake snarl at WOT for lack of a better word that really compliments the Barker pipe! There were no signs of backfiring or higher engine temps. So, I think I owe the guys at Twin Motorcycles an apology. These things REALLY WORK even with the stock airbox and Barker/Erik Buell Racing ECM combo. I told my best friend tonight who also has a black CR and he just ordered up a set tonight. Nice job Dris and Martin! Here are some before and after pics:   -Tutt (Message edited by CowboyTutt on November 14, 2010) (Message edited by CowboyTutt on November 14, 2010) (Message edited by CowboyTutt on November 14, 2010) | ||
| Father_of_an_era |
Well Tutt, I think you just inspired me to invest some money in these stacks! I should have my KEDA exhaust here in a few days or so and I am now considering ordering these stacks to complement the exhaust, Erik Buell Racing ecm and K&N filter on my R the way it complemented your set up on your CR. | ||
| Zac4mac |
Cowboy - You should remove the cable from the 'noid and tie your throttle cams together for smoother/stronger top-end. Also gives a lighter touch to the throttle. Zack | ||
| Fresnobuell |
So the rule of thumb on the velocity stacks is longer helps the top end and shorter for the bottom end? I have read about variable length stacks but since these are obviously fixed--what about the bottom end? How much do they cost? | ||
| Avalaugh |
Top of my head 100 euros but take a look on there website, shed loads of great products | ||
| Blower1 |
@ Fresnobuell Longer stacks helps bottom end and shorter for the top end. When installing these stacks, there are no need to remove the lower airbox. Just upper cover and air filter. -Pasi | ||
| Fresnobuell |
Longer stacks helps bottom end and shorter for the top end. Thanks for clarifying. So theoretically then these things should help the bottom end? I guess I was confused with the OP's report.} | ||
| Cowboytutt |
Here's a useful link explaining how velocity stacks work: http://en.wikipedia.org/wiki/Velocity_stack Or you can read about TM's stacks and how they were developed after trying different lengths here: http://www.twinmotorcycles.nl/artikelen.asp?aid=76 Putting the new stacks on with the lower airbox on would seem a lot more difficult to me as your wrists are together reaching through a fairly small hole where the airfilter would be but YMMV. -Tutt | ||
| Redbat |
Cowboytutt,I ordered a set of these stacks about a week ago. They were shipped using TNT as the shipper instead of DHL. DHL is $100 versus TNT which is only $20. How long did it take to receive your stacks, and what shipper did you choose? | ||
| Cowboytutt |
They were sent back the first time because the shipper could not scan the number correctly. When they were re-shipped via TNT, I don't know, about two weeks? Seemed pretty prompt considering the distance. I'm very impressed with the product and hope you will be too. Please let me know what you think. Thanks! -Tutt | ||
| Fresnobuell |
So they are claiming 2.2 HP and 5Nm of torque--but these are peak numbers. the final stack run also had an open airbox as well. looking at the dyno runs I was impressed at the increased area under the curve more than the peak numbers. If this graph is real, then the midrange differences appear to be 8-9 HP and 10 Nm or torque. Can an open airbox and these stacks really make that much of a difference? (Message edited by fresnobuell on November 15, 2010) | ||
| Cowboytutt |
Fresno, I'm not paid by Twin Motorcycles to respond to this thread as they probably wanted their stacks to work with their own tune. I'm just relaying my own experiences with this particular combination and it really rocks! What more can I say???? -Tutt | ||
| Fresnobuell |
Tutt--Not questioning you. I understand your writeup is strictly SOTP. Questioning the Twin Motorcycles claims. If you read the link above about the various stack heights, there are inconsistencies in both terms and numbers which lead to questions about validity. | ||
| Cowboytutt |
Fresno, my thought's exactly!!! Which is why I did not expect much. But to be fair to Dris and Martin, they really DO work and I highly recommend them based upon my personal experiences! -Tutt | ||
| Easyrider |
Maybe some one can do a dynorun, we have a German customer who did the dyno and he is really happy I will not post his gains that is up to him telling that people like us post fake dyno data well you always have people that say that on every kind of forum where people develop pefomance parts that is normal, I myself am really critical about others claims and always test stuff on my own dyno with myself as a dyno operator, my filosopy is not based on getting happy with fake dyno data posting but to show people what we do and what we make and if people like to be critical I can fully understand, life is short, ride a Buell | ||
| Froggy |
Not to offend you Dris, but many times a part manufacturer will either skew the truth or flat out lie to make their product look better. A quick search on ebay for "performance chip" will show a ton of it. I personally know you are honest and wouldn't deceive us, but not everyone has that trust.  That said, the stacks are looking better by the day. I've always been happy with how my bike ran, but if this helps it in the lower RPM's where I usually ride, I'll have to give it a shot. | ||
| Firemanjim |
Tutt,bring that thing down here and we can run it,love to see those on the bike.Need to learn more about these bikes now that I own one! | ||
| D_adams |
I wonder what the price is for the intake setup. Looks like Erik Buell Racing's had stacks for some time now, that pic is from back in April.  | ||
| Cowboytutt |
It looks like the stock intake on the rear cyclinder but a velocity stack on the front??? Strange. Jim, you mean you finally got tired of all those used Triumphs and bought a real bike??? Perish the thought! It would be great to see your shop. Hopefully I can get down there in December. -Tutt aka Andy from Laguna Seca (Jerry's friend) | ||
| Cowboytutt |
Hey Father of an Era, first off, I just wanted to say your a Cool Dude! Secondly, I don't see an Erik Buell Racing ECM for the Keda exhaust you will be using, so I can't guarantee how it will work with your tune but its certainly worth a try! -Tutt | ||
| Father_of_an_era |
Hey, thanks Tutt! Yeah, when I purchased the ECM Michael from Erik Buell Racing and he said that they should be working on an ECM for the KEDA and when they develop one to ship my ECM back to them and they will reprogram it for free minus the $10 for shipping. I figure I will give them a try in a month or two or maybe make them a Christmas gift for myself!!!  | ||
| Cowboytutt |
That is great news! -Tutt | ||
| Firemanjim |
Andy,still commute on my Triumph and race Suzukis,but could not pass up the screaming deal on the 1125.Come on down!!! | ||
| Redbat |
Hey Cowboytutt, to answer your question about the velocity stacks. I received mine today in 13 days. Haven't installed them yet, but I'm very impressed with the quality. Billet aluminum, turned on a lathe, makes a quality part. Can't wait to try them with my air scoop and modified inner air box. | ||
| Father_of_an_era |
So, what did the stacks cost in American currency? | ||
| Redbat |
Stacks, shipping, plus VAT came to aprox. $175 US dollars. Not cheap, but good quality. | ||
| Cowboytutt |
Hey Redbat, thanks for reporting back! Glad my time estimate (and my memory) was reasonably accurate. My friend is waiting on his and asked me the same question so you have provided good information. It sounds like the price of them and the shipping cost has gone up. My friend paid double what I did for shipping. -Tutt | ||
| Bigevildoer |
Stacks, shipping, plus VAT came to aprox. $175 US dollars. Not cheap, but good quality. They shouldn't be charging VAT 'cause it's exported out of the EU (this for any buyers outside the EU of course). | ||
| Easyrider |
Bigevildoer, We ship some years now to the USA, and we don't charge VAT  | ||
| Redbat |
Then why was I charged vat during check out? |
