This particular topic is also being covered under "My Dasa Experience, Not Good" but the mods asked me to post here for indepth dyno discussion. Se the original post to bring yourself up to speed if you' d like.


Basically, here are two dyno sheets on the same motor. No runtime on motor between dynos. Why is there a 10hp difference?

Rossiers dyno (the 1st one) shows 52hp
Click to view attachment

Dasa's dyno (the 2nd one) shows 62hp

Click to view attachment

that's dynos for u, some are close, some are a lot different like this scenario.

different days, different methods of strapping down, different tires all play factors...

I think maybe he is leaning towards something else here. Like he paid a good bit of money for not a lot of power according to the dynojet.

Seems pretty odd to me, I would not be happy. Both Joe and Dan should be competent enough to know how to run their own dynos tho.

Any chance of:
What year bike?
Modification list?
What a stock bike is claimed to make on each dyno?

no surprise here,,... I've seen this with his flow results too.....

good luck with your build..... I would suggust you let Joe from Rossier help you out from now on....

thanks for sharing..

thats pretty Phucked up,

IN MY OPINION, NOT FACT but that Dasa dyno was manipulated!! ive read many times where mustang dyno's can be manipulated to show a higher HP

I was talking to a local shop here in town that had similar results. A local racer who races pro (no names due to sponsor issues) had his machine built at DASA and dyno'd. It showed 64 hp. The racer brought the machine to the local shop and dyno'd it without touching the quad and it dyno'd at 57hp.

Not flaming, just adding another confirmation on the high dyno numbers.

Heres my take on it.....A mustang dyno owner.....That DASA dyno is definitely not correct! If I were a betting man, here is the scenarios I would say is played out.

- The dynojet that Rossier is using is an eddy current DJ, and the MD that DASA is using has the parasitic multiplier value much higher that 1.00 (where it should be) or is calibrated using a weight that is too light.

I can adjust my parasitic multiplier to read what a DJ inertia dyno will read (which is higher), but I cant surpass that number by using the highest available multiplier number. This would be the case if Rossier does have an eddy current dyno. But if Rossiers is an inertia dyno, then there is also some flaws in the calibration of the MD calibration weight. This is all going off the assumption that Rossiers is setup correctly and indeed putting out correct DJ numbers.

Joes numbers seem far more realistic here than the other way around...after all in the last 4 years how many stockbore 450s have come off dynojets at over 60 horse

i know a few

numbers aside does anyone else here see how wavy the power is on this engine in both graphs? bad harmonics maybe? I would be interested to see the fuel curves from these runs

im sure they are out there! but its an accomplishment for sure!

My stockbore 05 pump gas mild cam motor hit 55/33 on our local dynojet, and 67/40 on a local dynomite. Same build within 24 hours of each dyno.

With a better pipe-coming soon, high comp, better intake, and a 208, im almost sure i could hit 60.

-Kip

there was a mustang in vegas reading pretty high for a while there too if i remember correctly...interesting stuff

KIP best of luck to ya! All i can say is getting from 50 up to 55 is a hell of a lot easier then getting from 55-60 LOL and further so what it takes to get well into the 60s

my best runs as a 478 were 60...i always wonder if i went back to stockbore changing nothing else where i would end up...

Kinda puts a big question mark on a lot of "claimed" numbers that dasa has posted in the past on their dyno. I still believe that when it comes down to it, Dan knows how to port a head, but it seems the average guy is getting screwed with sub par work.

those dyno numbers dont look like the same motor to me..

i almost have to agree....look at the crossing points of horse and torque at 5252...then look where each motor makes peak power...something is fishy as hell here and im almost guessing his motor never saw a dyno at dasa...after all thats a hell of a lot of work to do ina few hours...tune...then break back down etc...

The owner should call Dan find out whats going on.......... Also get his money back

Peak numbers dont mean anything anyways.

I have a pretty high pulling peak number stockbore for what it is, but when a guy that is 200lbs hops on it, it becomes way slower.

Peak numbers are important in drag racing. You have to look at the curve for rideability.

My bike as it sits is harder to ride, but screams when you know what RPM range to ride it in.

I dont see what the big deal is. Numbers are numbers.

If your tired of dasa, try racers edge AZ, they wont let you down.

-Kip

ive only seen 3 on a dynojet

if its not a DYNOJET don't believe it

buck, my bike pulled over 75 on a superflow.. and its undefeated in the fsa series, i know that garrets bike pulled close to the same numbers on his own dynojet.. so stop getting all wet over the dynojets.. dynos are for tuning purposes.. what really matters at the end is how happy you are with your build, and how many trophies you bring home.. plain and simple.. i personally ridden gerrys stockbore/stroke dasa build/yqr build and that things hauls the mail for sure.. and its was dynoed on that mustang, and if it reads high then fck it it reads high, but i still saw gerry put a spanking on some big nitrious builds in glamis on presidents day weekend.. but wat do i know maybe racing on the concrete jungle is different..

Could be lots of different reasons, no one here is going to be able to tell you exactly. Probably a combination of several things. Best thing is, to do what people always say, pick one, use it as a baseline and stick to it. Numbers are just bragging rights. I would have a hard time believing in a super high number if it wasn't expected; if it was, go with it and have fun. If you want to know what it really has, take it out to the drags and line it up with some other 55+ hp motors and you'll know for sure which one is right.

im with ^^^^^^^^^^

Just heard about another one of these issues with a Pro rider ( shouldn't post name )... Dasa claimed 70 hp and it was dyno'd on Janssen's dyno last friday @ 55.3 hp... This was hear-say so I'm not 100% on the acurracy, but this is what I heard.

^^^The best advice so far.

I probably heard the same story. Did the last name start with a 'D'

The reason this all started is because the bike is a pooch!! If you read the original thread you would see why this became an issue at all. He got jerked around after spending thousands on this engine and being told that he would have "PRO" level power and he got a 52hp piece of crap. He doesn't drag race in the dunes and he needs roughly 60hp to go to the line knowing he is on equal equipment. He already knows it's slow he didn't need the dyno to tell him that.

ALL DYNO's can be manipulated.....its called CORRECTION FACTORS. the only way you can get a true reading is if the dyno HAS NOT been altered from the factory settings. tires do have a big infuence on #'s also. if you dyno a bike with 18's and then swap to 20's on another dyno it will read less hp on the taller tire. I know a guy with a dyno, never changed any parameters on the dyno, used to use 22" tall tires to dyno. swapped over to 25" tall tires(more realistic to the tire size he is running) and lost almost 7hp just from the tire size!!!

i also know a raptor that dyno'd @ RE........went to another dyno.......and read 9.9hp lower..........

No dynos read the same. alot comes into play but i would be pissed if this situation was mine

funny thing how this has NEVER been your guys advice if a Venom bike pulled in the lower 50's...

If that was he case the sky was falling and it was time to yank the head and send it to somebody else...why not that advice now?

not trying to start chit...just stating the complete obviousness of this situation.

Only reason this guy ended up on JOES dyno is because his bike was getting worked by other bikes with less money put into them...if i spend 3 grand with ANY builder i expect to be at the top of the pack when riding...I expect to be at the top of the pack when racing...and I expect to pull good numbers on the dyno Im on compared to the other bikes that have dynoed previous to mine...

and a heck of a lot more goes into winning races in the sand then just power...gearing tires chassis rider weight and ability all play more of a role than power alone...thats no secret...this guy has a sick bike...and wanted the best that money could buy and got 7 months of circle jerking...a false promise on the power output...and the more i compare these graphs it doesnt even look like the same motors...

Kip...numbers may not matter when it comes to internet racing you are correct...but everything else being equal if your bike pulled 55 horse and some dude right behind you pulled 60...and you both spent the same money but different builders you might scratch your head and wonder whats up...52 is a far cry from what a solid stockbore is capable of...and a far cry from what was promised regardless of dyno...ive seen much higher numbers off of joes posted in the past

Who let him out?

Someone shove him back in the bathroom and lock the door quick!

cute...

...sorry if my post was somehow unpleasant to you...i guess in reality you can hit the ignore button if it bothers you so badly

You're a funny guy Gary.

well said JJones, well said

Yep last name started with a D ended with an E.. :)

FW, yup Cory and Pico told me the same story.

JJones, great point. All your posts are perfectly to the point with no BS.

thanks gumby...I may not always get the popular vote but i do try to keep a level mind when assessing a situation whether its a thread for or against my own porter as well as for or against some body else builder...