CPI pipe -where are the conclusive results?

r1yfz · Post by **r1yfz** » May 19th, 2010, 7:51 am

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?

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 8:03 am

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

dubious01 · Post by **dubious01** » May 19th, 2010, 8:07 am

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.

dubious01 · Post by **dubious01** » May 19th, 2010, 8:10 am

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?

M.F.D.B. · Post by **M.F.D.B.** » May 19th, 2010, 8:16 am

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

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 8:32 am

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

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 8:37 am

i'd say i'm close on the jetting

r1yfz · Post by **r1yfz** » May 19th, 2010, 8:47 am

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

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 9:02 am

thats right

dubious01 · Post by **dubious01** » May 19th, 2010, 9:20 am

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...

dannygraves · Post by **dannygraves** » May 19th, 2010, 9:40 am

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

hoofarted · Post by **hoofarted** » May 19th, 2010, 9:50 am

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!

dannygraves · Post by **dannygraves** » May 19th, 2010, 10:03 am

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

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 12:04 pm

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

Post by **AlisoBob** » May 19th, 2010, 12:39 pm

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

http://www.youtube.com/user/500bigbore · Post by **Roostius_Maximus** » May 19th, 2010, 12:48 pm

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

dannygraves · Post by **dannygraves** » May 19th, 2010, 1:05 pm

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

kball1313 · Post by **kball1313** » May 30th, 2010, 12:02 am

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.

BannedCR500Riders.com

CPI pipe -where are the conclusive results?

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