Interesting Dyno Test, Can Vrs Stock 700

I'm not so interested in the initial #'s themselves, but the actual gain and losses shown. I think this is great info as it shows exactly what we have been told for a long time. And no matter what the accuracy of the dyno is in #'s would it not still show accurate gains/losses at given rpm's? I have no idea about dyno's or anything involved with them, that's just why i'm asking.
 
I am in no way not saying the parts gained or lossed, thats easy to see. What I am trying to point out is ya cant say "A engine only makes "x" amount of power with these brand pipes when I only show this much on this dyno", thats not correct as your not comparing it the same way, because of the list of things I listed and the differances in dyno's, thats all I am saying. I am not saying anyone is wrong, just that there is other ways to get a reading and theres lots of things involved, this can change the given readings ALOT!!!
 
Cans

Ive got a stock can with the mod done, and an after market can- Dyno port- i think, me personally, i think the stock is the best bet as far as more power, but triple pipes would be the best of both worlds!! :nos:
 
well done, not raining on nobodys parade. we did i dyno on comparing numbers on stock machine, totally stock, engine never opened.Sled runs regular fuel.we have a weather station and all the correction factors are corrected. we run 3 - 4 runs on each test, i realize all dyno numbers will be different but when running this stock sx with a can and with stock can and with modded can, thats a very good comparisn. the numbers may not be as exagerated but they dont lie. My buddy who has the dyno ran a superflow dyno before. he understands dyno testing very good.As for the viper test, it was ran only with the bender pipes on,i really want to get a stock one on there for comparing numbers withthe piped one.that will tell us a general gain.Honestly everything we ran on this thing is been very close to propper numbers.Thre has been alot of tests with the land and sea dyno that i have seen published to. So are you saying use a superflow if you want real numbers, if you are saying bender used a superflow to dyno there 700 sx can and go hp gain out of it there must be something wrong with this thing.I was just putting this on here for peaples info, whether they believe it or not is up to them.But i am wondering what you are trying to say exactly by your post don, ? Should i not waste my time posting this stuff?
 
Lyle; keep up the great work. Not everyone knows you & your gangs reputation. You guys winning 600 class in 99 with a 600 twin yammie at haydays should be proof enuff!
 
thank turk, i knew there would be someone arguing the point,the sled i tested was ran for a full season, we are not doing a race engine here, this is a stock viper with pipes.It pulled very well. Ya we could change some correction factors and make extra h.p . BUt this is the actual number it makes on the trail. Not leaned out to blow up. i see on the sweden site the viper stock onl;y made 115 hp. well if thats what we are going to get when i dyno a stocker, that would be a 20 h.p gain. Thats not bad
 
i would like to see that test w/triple pipes as i have just installed power inc. end dumps/head gasket mod./reed stopper mod on my 97 sx 700 could anyone venture a guess as to the numbers on this common combo.
 
I remember seeing the same crew in sweeden dynoing that exact set up & ending at about 128ish hp at 8450 rpm. I will see if i can find that link.I posted that link earlier & it has a 00 sx-r with pi end dump pipes. Your not gonna like what u read.

http://www.m-performance.com/Sidor/dyno_yamaha.htm
 
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Keep up the good work,this is for the average guy.I have always said that cans wern't worth the money and if a pipe manufacture states you will recieve 25hp expect something like 20hp.One thing to also remember if you run uncoated tripples on a warm day and jetted for a cold day you may get spancked by a stock machine.I run coated tripples and as soon as the temperature warms up I can feel lots of HP loss.Now I am installing an atacc but to be on the safe side I have jetted one size richer across the board mains, pilots and needles than required just incase.Rich is annoying and lean is expensive.
 
sharper diffuser angles like those used in most aftermarket pipes almost universally lead to a tighter fuel curve.

which is a sciency way of saying what marcush just said. If you've got pipes, your jetting has to be close, not like a stock motor where you can be way fat and not lose much power.
 
No, Lyle, what I am saying is where you posted that benders pipes only make 132hp and that they lied about being 153hp "busted", thats where it originated from.
Sure, you can show a gain or loss and know if a "part" is doing something on that paticular day and under those conditions, and I beleive the silencer information you posted was valid and exactly what you found on "that day" but to state that the pipes dont make the power I will tell you is incorrect unless you can match the dyno conditions exactly. Ask your buddy running the dyno since he has worked on a superflow before what would be the outcome with 85% air density and 100+% percent???? Are you dynoing in a temp controlled enviorment and have access to change the relative humidity and the air density??

So if you put a stock viper on the dyno and it doesnt read 122hp was yamaha lieing about it???

I think the best thing here would be that you call Jim at dynotech and ask him if you can get the same numbers with a dynomite as you can a superflow, no need to talk with me I dont know anything, Jim does it for a living, has a superflow 901 and does all the dyno work for the snowmobile shootouts and then give Gus Bohne a call, he worked for dynomite for years and years and ask him as to the differances between the 2, you might get a bit of differnt information then your used to hearing, and it will be the SAME thing from 2 completely differnt guys.

Can you post the dyno sheet for this?? so we can see the bsfc, air density, water temp etc. would like to see the chart, not the graph.
 
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I know tha guy that owns dynomite, they are sweet and I am partial...... but he DOES sell them to a lot of guys that race and want real #'s, not advertising #'s. the dynojets are great for advertising, can get some silly high #'s that look great on paper lol! I am with Mrviper, different dynos make a BIG difference :)
 
Turk said:
I remember seeing the same crew in sweeden dynoing that exact set up & ending at about 128ish hp at 8450 rpm. I will see if i can find that link.I posted that link earlier & it has a 00 sx-r with pi end dump pipes. Your not gonna like what u read.
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Crap!! I was really hoping that would've been the center dumps and not the end dumps on that particular dyno. 124.5 hp is alot lower than the 130ish I thought I had under the hood.
 
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thanks for the info turk you were right i did not like what i read . sooo how do i get to 140-150 horsepower ? cylinder porting and 38`s or big bore.maybe nitrous ?
 
Anything on SRX's???

Interesting stuff guys.
How about some dyno information on SRX's?
Stock vs. aftermarket cans vs. aftermarket pipes.
Probably a lot of people curious and interested in that too.

Thanks
 
On a different day on a different dyno it may read 10-12 more hp. I had a buddy with a 600 sx-r with bender pipes & good porting. On a real good dyno with a very extremely good operator(local engine/pipe builder) he got 124 hp. On an older land & sea with a newbie he mighta got 140.
 
the older land and sea just not as good as the new? there ought to be a standard set of parameters for dyno testing sleds, boats, cars, etc. always HATE how people selling products can get like 30 hp from an air filter lol! seems like eventually people will get pissed enough to get standards set
 
Turk said:
I remember seeing the same crew in sweeden dynoing that exact set up & ending at about 128ish hp at 8450 rpm. I will see if i can find that link.I posted that link earlier & it has a 00 sx-r with pi end dump pipes. Your not gonna like what u read.

http://www.m-performance.com/Sidor/dyno_y:nos: amaha.htm
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What the deuce is that? I just got a set of PI End Dumps because they were supposed to be the most powerful pipes? SLP's beat them by almost 7 HP!!! I hope those dyno runs were made on COMPLETELY different conditions... but that might be wishful thinking. Now I have a set of coated End dumps sitting down here in the basement that i was so excited to get lol.
 
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