We had the oppurtunity to have a forum member's 2011 Vaquero here in my shop for lotsa goodies.
Before anything was done we dynoed his skoot to document his stock power and torque, then fitted a set of Cobra Tri-Ovals with follow up dyno runs. This skoot stock had quite a bit of exhaust popping on decel, and with the pair system hose blocked off and the Cobra's the popping was worse. We removed the right side air box to gain access to the intake area which allowed me to do a intake system vacuum leak check. The fluid we use was immediately sucked in on the left side of the t/b-intake manifold junction, so i knew at that point alot of the exhaust popping was due to intake vacuum leaks. The Cobra's gained power and torque throught the powerband.
DYNO CHART SHOWING STOCK VS COBRA TRI OVALS...
The next step was to perform the 600 mile service, gettin rid of the factory coolant, tightening all the fasteners (377!!) , flushing and bleeding of the hydaulics, general lube, etc.
At the same time we removed the t/bodies and intake manifold for inspection. His manifold was the worst I have seen, it was severly warped. I machined the t/b's and the manifold and reassembled it all with new o-rings and 1211 sealant.
We also at this time installed a chuckster BAK and then the skoot was back on the dyno for follow up runs to document the affect of the BAK...
DYNO CHART SHOWING COBRA EXHAUST TO CHUCKSTER BAK...
The power loss up to 3500 rpm was due to the air/fuel ratio going pretty darn rich, which was gonna have to be rectified with the mapping and ignition timing changes utilizing the PCV. We then installed the PCV along with a set of Avon grips with my mod.
DYNO CHART SHOWING H.P. GAINS FROM CUSTOM MAPPING...
DYNO CHART SHOWING TORQUE GAINS FROM THE MAPPING...
DYNO GRAPH SHOWING STOCK AND FINAL H.P. FIGURES...
SO...stock peak H.P went from 68.76 to 80.83 ponies, with a gain of 9.19 ponies @ 4000 rpm!
DYNO GRAPH SHOWINGSTOCK AND FINAL TORQUE FIGURES...
Peak torque went from 88.84 to 98.59 pounds!!
All in all nice gains. The Tri-Ovals look absolutely gorgeous on his black Vaquero with a really nice sound, quiet when you want them to be, and a some noise when you twist the throttle. With the change to Amsoil this clunky shifting Vaquero now shifts like a hot knife thru butter!!
Hopefully he will chime in with his thoughts.
I went for a quick ride tonight as Ray was typing all of the above...
Well...All I can say is that it is a different bike on many aspects.
The Cobra ovals sound really nice and look beautiful. The sound is deeper than stock at idle, deep and throaty under accelerationn to cruising speed and bark when you "give her hell". Definitely a great improvement compare to stock.
I can't imagime someone would want something louder...but that's me.
Upon twisting the throttle I can really feel these 12 extra ponies progressively all along the power band. I did a few acceleration and the speedo climbs rather quickly. Merging into traffic doesn't have that hesitation...and that sound is intoxicating.
The vibration (shutter) felt at or around 2300-2700 rpm shaking the whole skoot has disappeared...Some of you know what I am talking about.
The bike moves forward with authority without missing a bit or shaking.
The temperatures are also much cooler, even in stop and go traffic and it seems like the bike cools down faster while resuming city speeds between red lights. (35-50mph in gear 4 or 5).
Regarding the BAK from Chuckster, it makes quite a bit more noise and at full throttle it lets you know more air is getting into the cylinders. At cruising speeds, there is no noise more than stock or annoying side effects.
I have no comments regarding Hp and torque numbers as Ray already put it nicely and well documented. But the added power is there trust me.
FYI, the bike has 700 miles now and it will get even nicer as miles climb.
I didn't really respect the user's manual for break in and went past the 2750 rpm limit often but never maintained high rpms.
The poping backfiring was VERY bad before and is COMPLETELY gone and I have a nice rumble when off the throttle.
I am very happy with the mods and the excellent work from Ray and Mark (his mechanic).
I will post pictures of the bike with the tri ovals soon.
For more details about the mods, tweaks, Ray's trade secrets, costs, etc, please direct you question to RACNRAY.
Joel aka AVSBEZZY
Chuckster BAK with stock look,
Temp sensor relocated
PCV w/ignition tuned by RACNRAY
COBRA TRI OVALS
Almost 81 HP, almost 99 lb·ft
Current bikes :
VAquero 2011 US
Triumph Bonneville America 2002 not stock US
Kawasaki KLR650 2007 Boring
Gone but not forgotten:
1980 BULTACO 350 Blue Trials bike Euro
1986 HONDA 200 TLR Trials bike blue red and gold rims Euro
1980 husqvarna 390 Anodized gold rims Euro
1986 yamaha xt600 tenere white red gold Euro
2007 Kawasaki Z750 Black Euro
2002 Triumph Tiger 955I
2005 Suzuki SV650 Yellow and Black US
2009 DRZ400 SM not stock Black