BannedCR500Riders.com

was that a std power rating? you need to set the smoothing to 5 so those graphs are easily compared and readings look better! have any pictures of the AF curves?

hoofarted wrote:Good to hear the final result. Guess thats why its a dunes pipe.

I'm +1 on the Fatty as well. That coupled with 250 ignition = good times!

this is an 88 250 ignition on these engines.
I have to wonder, my porting moved the tq+hp 1000rpm lower than the other engine, if i'd have run the cpi on it would i have had to turn it 7000 to see the power? when the friday engine goes in bros af with the 39pwk i'll run it with a cpi to check it out

hmmm, good thing I kept my fatty, narley, stock and pc pipes!
hey you wanna sell me the CPI?

I am propbably going the other way , top end HP.

I found in the slick and grease I did better with a weaker bottom, for traction ability, and a monster top end when I could use it.
Moving the power upward really knocked the mid hit down some too, for more control.

Basicly tractor around as necessary and let er breathe when I could.

What kind of tire?
what kind of dyno?
whats your elevation?
did you see tire spin?

Not at all to be an ass, cause I truly respect your skills, and efforts too,
just wondering, that doesn't seem like a very happy dyno though?

whats a 450 make on that dyno?

I thought to myself "were they using a knobby?" as the dyno looked really "rough"...

dubious01 wrote:hmmm, good thing I kept my fatty, narley, stock and pc pipes!
hey you wanna sell me the CPI?

I am propbably going the other way , top end HP.

I found in the slick and grease I did better with a weaker bottom, for traction ability, and a monster top end when I could use it.
Moving the power upward really knocked the mid hit down some too, for more control.

Basicly tractor around as necessary and let er breathe when I could.

I'll say with certainty that this engine with the fatty would be faster everywhere than this engine with the cpi because of the torque. the dyno pull was 5 seconda longer on the cpi! i had to sit my ass on the back fender cuz i was spinning the tire from low rpm with the fatty on, not an issue with the cpi.


if i had to draw a map of what the engines power delivery feels like it'd be close to this....
green is the friday engine, red is sunday and blue is sunday with the cpi

i'd say i'm close on the jetting

M.F.D.B. wrote:I thought to myself "were they using a knobby?" as the dyno looked really "rough"...

the "smoother" setting wasnt turned up on the dyno

thats right

wow, great work,
thanks for sharing cause you certainly didn't have to,
and we all know the more info we put out there, the more vulnerable we allow ourselves to be to criticism.

looks like I need to find more fatty's incase I crush this one, and of course FMF don't make em anymore...

yup, fatty FTW. I had a old school gold series (pre fatty) that DeWayne said was the best pipe, I gave it to hoofarted.

dannygraves wrote:yup, fatty FTW. I had a old school gold series (pre fatty) that DeWayne said was the best pipe, I gave it to hoofarted.

I'll have to give that one a try soon...thanks again!

you have to come out to dumont next season to properly test these pipes! DO IT!

i wish. I'd like to head south and make a tour, but even getting away for the time i did sunday meant i was behind on alot of stuff

Roosty, run a OEM pipe for shits and giggles...

if all the non-ruined stock pipes were'nt hanging in your garage i would

Bob, you should mail one to roosty for him to try

I have a stocker that was pulled off from new, and two of the old gold series fatties. I'd send em over for dyno testing.

One of the old pipes says fatty on it and the other just says gold series. They both look the same though. Aside from the stock pipe, the fatty feels the best all across the board. Good strong pull right from the bottom to the top. I only use them in the sand so I don't mash them up with all the rocks here.

No dyno testing here, but a lot of dune riding in Oregon. 30 gallons worth in 5 days last weekend.