So, I just had a 480 built by KBR, and when I picked it up, the dyno numbers weren't any thing to write home about, and here's why.

I had a bad chain and sprockets on, and bad carrier bearings, heat, and low atmospheric pressure. Kam figured all of these things, plus heavy tires for they dyno runs cost me about 5HP or more.

It's my fault about the chain and chain wheels and bearings. I had a +4" swinger that was waiting to go on, and I was to lazy to change these things out before I dropped off my quad to KBR. When I broke the chain and took it off, you could wad it up and then hold it up and shake and it would not go straight!(Kam lubed the hell out of it, and it was still like that!) 2 of the 3 carrier bearings felt bad, as in the had rough spots when you rotated them, and the 3rd was stiff.

High heat and low pressure doesn't help any thing when it comes to the internal combustion engine! The higher the atmospheric, the more air enters the cylinder, the more power it will make. If you know a drag racer, odds are they have a fancy lil toy that will tell them the temp, and the atmospheric pressure, and may even give them the equivalence of how many feet of air they are running in. This is all to help them tune the carb, and the car to go down the track either fast, or consistent.


The moral to my story is, I know my quad will lay down some decent numbers, even when things are bad, but I don't know what it will do when all the stars are in the right lines!


Any one else have hints to make sure people get the most out of dyno time??

what numbers did it make anyways

45 HP, mid 30 TQ

The build is a 13:1 CP piston, Cylinder works BB cylinder, Venom ported head with +1 Exhaust valves, rebuilt crank with Hot Rods rod and welded/balanced, 42.5 FCR carb, stock intake with air chamber removed/plugged and Pro Design ring and K&N filter with Outterwears on filter and air box, no lid, Sparks full exhaust.

Don't get me wrong, I'm more than happy with the build and with KBR, Kam treated more than fair, and spent a lot of time on the phone with me helping me figure what way I wanted to go with this build.

The quad is a dune rig, and I think when I figure out what paddles I want to run, it's going to be a fun dune ride!

are you gonna dyno again with all the new stuff you mentioned?

I have been told to remove the rear brake caliper,

if you remove the rear caliper it may show a bit more power, but what does that matter if you ride with it. bragging rights? dyno the way you ride.

check the thread again, I just answered a question
my quad has never been on the rollers
and in a word YES.................... yes its for bragging rights
(or more exact numbers for tuning, eliminate variables like brake drag)

dyno the way I ride? I dont think paddle tires on the dyno would be a good idea

I dont see many mx riders running dyno tires on the track

dont be a smart ass. obviously you cant dyno with paddles. do whatever you want actually, i dont care, but inflated numbers are only good for inflating one's ego.

I wouldnt remove the caliper myself but the thread asked about things that can kill the numbers

didnt realize I would be offending anyone by giving tips to get the best numbers

I intend to have it tuned after I figure out what intake I'm going to run.

I think your dyno time would be best spent running the quad as close as you can to real world conditions. But if you just want to bench race, then do all the tricks you can think of to get every thing you can out of it. To me the B.S. stops when the paddles start to toss sand!

All a dyno is, is a tool. The sooner some people figure that out, the better.

-Kip

if you can gain 5hp by fixing those things, that would be sweet. and some good info to reference. make sure you update this thread.

i hear 50hp on the KBR dyno is a very strong build. its a tough dyno to get braggin rights on.

everyone cracks me up with this dyno is a tool stuff. yeah, it is. but it also lets you know if you got your moneys worth as well.
if a guy built a 544 with all the bells and whistles and it pulls 40 on a dyno, i guarantee every guy on here would want to know why. they would not say..... " the dyno is just a tool, im just happy its faster than stock." BS

everybody likes the numbers, and makes you feel good about what you've accomplished. if you say you dont, your lying.

I get what you are saying. Yes, a dyno is simply a tuning tool, but try telling a gearhead that! My dyno reads lower than anyone elses, mainly because its an eddy current type. I bought this type to be a tool, not a bragging reciept....and it has shown to be simply awesome. This type of dyno will do more pull styles than you can imagine due to its ability to actually load the bike.

For instance, about 1 month ago we had a guy come in from Atlanta that was bragging on how his bike made 48 HP with his HRC + Pipe + ect.. build. I told him I doubt it would make it on mine. I told him I have roughly the same build and mine only makes 42 HP, so he insisted that his bike would blow my junk off the track in a drag. He didnt want his pride put to shame by making a pull on my dyno (this is what it boiled down to even though he didnt say that) so I told him the next time he was up, stop by and we would do some drag strip and roll on pulls (like 40-60 mph pulls, counted by time) and he did. His pulled about .5-1.0 seconds slower than mine did with the same tires that I use. Then he got all intrigued and finally made a pull netting 39 HP to my 42 HP.

Moral of the story is......you can brag about the numbers all you want for magazine ads and campfire discussions, but you cant fudge the clock and you may still very well get your ass handed to you while your bike makes 6 more HP. Numbers mean nothing in the real world. Especially when you see dyno (A) making X.X amount of power while dyno (B) makes a different amount.

agreed. read my race report in venom section. i run against guys on the hill with crotch rocket engines on them. they got nearly a 100 hp on me. LOL. i beat more of them than they beat me. i beat a 533 with a rage head on it. i would bet anything it makes more hp than mine. he didnt have a good set up for the hill. the big motor didnt mean much.

hp might win in the back yard, but it takes a whole package to win competitive racing.

that dude from Atlanta sounds like alot of guys around here. LOL full of chit

This is a pretty good topic....and you will get many different peoples opinions.

I actually witnessed some of this on my build prior to my very last build.

I had an older non o-ring chain that literally held back about 5 measurable HP on the dyno.

The more we ran the bike, the more it kept losing power...to the point I thought something was wrong in the engine. Sounded good, ran good, but with every set of runs I was down a little power. I was beginning to get very frustrated until we lubed the crap out of that old chain and emmediatly saw the power jump back up. Made a mess of everything unfornatly....lol

To me, that was a HUGE lesson as to how you need to keep your drive train if your going to get the full potential out of your bike. Power to the ground is more important than power off the crank. The way a chassis dyno measures power is through the tires, which is what you use to win races.

So to me, I tested cams and pipes and carbs, and ended up learning a surprise lesson on drive train, which was ever bit as important if not more than the total some of my tested parts that day. I dont think I gained or lost 5hp with any cam, any pipe, or any carb!

Its not about bragging, its about the entire project as a whole......how ever you come up with it. Thats not cheating, thats not fictitious. No minipulating the dyno itself for better "fake" numbers, just getting the most out of your setup.

and if numbers werent so important, I gaurantee most of us would'nt bother dynoing it in the first place. No one wants to shout, hey my bike pulled 37hp!!!! Theres a definite plateau on the scale you know you should be in with certain builds and if your not there you need to start figuring out why?

I love the local dyno pak. I feel safer and its so consistant since there are less variables that can take place.

I'll try and keep this thread up to date, but at the moment I'm in Russia, Siberia to be more exact, freezing my balls off!

Needless to say, I'm not going to get a chance to talk to Kam about what intake will work best with my build, and when I can get dyno time. Not to mention, when I left Kam was a one man band, and was busy as hell!

So, I put a KBR intake on and had it tuned. It went up from 45HP to 49HP.

Things that have changed since the last run on the dyno. New 4 over swinger with new bearings in the carrier, gearing from 13/38 to 14/39 new chain and chain wheels, and a KBR intake.

It's kinda hard to figure out what helped with the numbers, but I don't think the intake was worth 4HP.

By the way, I got to get this beast out and run some sand on it. All I can say is WOW! It really is a fun quad to ride now, and the guys that used to get away from me now fall way behind, and I haven't even really got in to it really hard yet, as I'm still trying to get used to it. I have yet to run into the rev limiter, something Kam tells me that I will do and get sick of quick. I have no trouble beating my brothers shee up the hills we have ran together, and he used to get away from me with no trouble.

I just had kinda the same results, put my bike on the dyno made 47hp. Just sprayed some WD40 on it and then made 50hp. I couldn't believed that I just picked up that much hp from a chain.

I like the DynaPak stuff, it uses the same loading and torque reading stuff that my Mustang make.....it just seems like a lot of trouble dynoing by the hubs instead of the tires. They are nice, compact and economical though.

Chain, brake dragging, wheel bearings and theintake all added up!
We need to change your pipe next!
That will get it on the rev limiter.
Thanks again!

Wouldnt a dyno always read slightly lower than real world application because of front brake drag? I dont have front brakes but i know when I took them off and jacked up the bike i could spin the tire with my hand and it would keep going alteast 4x longer before it stopped. Seems kinda minimal when the engine is pushing it though with momentum and all.

i started using them about 7 years ago when i played with a lot of turbos and they enabled me to hold rpm and boost levels so the car ran good everywhere not just at max boost and full throttle. The only draw back we have found is if you are pushing the limits of them you must have a nice sized tank of water to keep them cool. I was making around 850 whp but was no where near the 1000lbs torque limit and was darn near over heating it with a 1000 gallon tank.

That was a lot of the problem we ran into with our engine dynos were the water tank sizes and the supply, it cost a ton before we got it worked out. Also, thats why I got the eddy current dyno...we can create any type of load curve you want, any kind of speed curve you want, and basically simulate anything you want. This allows us to tune everywhere, not just a wide open or non loaded pull. I have pulled a ton of nitrous'd busas and GSXR's on it, but I cant wait to get a boosted bike on it....its really gonna shine!

Well looks like there is a Dasa pipe in the future! I will up date this thread when the pipe is on.

Broncbob, that seems a little low for what you have done to the bike, but again "and I am not getting into a dyno war" there is a big difference in dynos. I have basically the same build of 480 but most all venom parts including exhaust and on our dyno I am making 54 horse and that is with two seasons of riding on the motor. And please to all the haters out there this is not an advertisement for VENOM!! So anyways I think you should deffinintly be hitting closer to 50 hp for sure IMO.

KBR's dyno is known to read low. I was talking to another local builder this week about getting some work done on Banshee cylinders and Kam's dyno numbers came up. He told me that on any other dyno I could add at least 5 HP to Kam's dyno numbers.

What I worry about is the tune, and Kam has set it up spot on the two times he has had it on his rollers. Not to mention that he's a great guy to deal with. I wouldn't hesitate to take my quad back to him, or recommend him to any one I know.