201 replies to this topic

[4T_thumbs_down TT Bronze Member]

stimps said:

Not the same pipe. The Yamaha works pipe came of Ebay and looks a bit like an FMF factory fatty but eeerm different. I will get some pics of the more obscure pipes and see if I can get a video on the phone of a run or two. You can see a few of the pipes in my garage pictures.:thumbsup:

C'mon Stimps.... i have never been so anxiously excited like this before! :worthy: :D

[honda_best_789 TT Silver Member]

this is excititing!!!!!! cant wait for results

[mickeydee Get Help Now]

pump the rear tire up to streetbike pressure(35-38psi)make sure the tech is sitting right on the rear fender to help stop wheel slip on the drum.im not sure if you can use an afr probe on a 2smoke but if you can use it.

[stimps TT Bronze Member]

Ready to go. Road tyre fitted. Clean filter and pipes loaded. Box full of jets and a tank of fresh fuel. Even cut side panel for quicker pipe changes. Not long now my friends.:thumbsup:

[4 STROKER TT Bronze Member]

Now only if it was a honda you would see some big HP numbers :o)

[shrubitup brap]

4 STROKER said:

Now only if it was a honda you would see some big HP numbers :o)

Ya, too bad the last Honda was made in 2007 bub. :moon:

[BRM TT Addict]

stimps said:

Ready to go. Road tyre fitted. Clean filter and pipes loaded. Box full of jets and a tank of fresh fuel. Even cut side panel for quicker pipe changes. Not long now my friends.:thumbsup:

Can you do a video? Full noise would be good.:thumbsup:

[cwtoyota TT Silver Member]

Tagged... Can't wait to see the results of '05+shorty vs Fatty+shorty.

I have an SST and the '05. Hate the SST, love the '05

[stimps TT Bronze Member]

Some Tasters. I have passed the full data set to Roland to have a good trawl through and do some comparisons. Sadly I did not actually have a true shorty to test so not sure what the effect would be of that. Maybe between myself and Roland we can have a seperate area to publish some of the better comparisons. All power figures are at rear wheel, 4th gear runs, pulled from approx 3K rpm. Most pipes had 2 or 3 runs to ensure consistency, repeats were within 0.5hp between runs.


Myths Busted ( I think ).

1. Longer pipes make more top end.
2. The PC pipe has no bottom end power
3. The stock pipes are the best.
4. Spending that much money on pipes was worth it..(Personal one)

Stock 05 vs 06 front pipe. Std 05 silencer.(06 is red)

http://www.thumperta...achmentid=84508

Stock with Stock (blue) Stock 06 pipe with PC304 silencer. Red is with silencer (Yep power loss at top end but gain in lower end).

http://www.thumperta...achmentid=84509

06 stock and Stock vs DEP with DEP silencer ( DEP Green )

http://www.thumperta...achmentid=84510

Dep blue v PC red v FMF green

http://www.thumperta...achmentid=84511

DEP with stock ign Vs HPI (Blue curve).

http://www.thumperta...achmentid=84512

Will take requests on others but will need some time. Can also do torque curves.:thumbsup::thumbsup:

[mickeydee Get Help Now]

were you able to get an afr probe down the pipe?

[stimps TT Bronze Member]

No. Did not live check AF ratio. I would think that with the right pipe (DEP or FMF Factory Fatty) with a slightly leaner main it could be possible to break 45whp and smooth that dip out. Intersting is if you look at DEP's own published graph you can see the same. I am totally shocked to see anything like what is claimed. I honestly expected to leave the day with a love for the stock pipes.

http://www.deppipes....#/yamaha/yz250/

[shrubitup brap]

Dep is the dope!

[dirtdan TT Bronze Member]

Thanks Stimps...:thumbsup:

[Nitroused383 TT Gold Member]

Confirms my opinions on the DEP vs PC pipe. Thanks for the info, did the HPI ignition retard the timing?

[stimps TT Bronze Member]

For a set of bolt ons. The DEP pipe with the HPI ignition shows some real gains at the top end compared to standard 06 pipe and silencer/ignition combo. Next step for me would be to take the torque part of the HPI program and merge into the power part. That would bring back part of the loss at the low end. Pretty good for a stock motor.:thumbsup:

As it stands.

http://www.thumperta...achmentid=84515

Or FMF factory fatty/HPI combo. Not the same gains at the top as the DEP but stronger than stock almost everywhere. This should be really good on the track.:thumbsup:

http://www.thumperta...achmentid=84517

[stimps TT Bronze Member]

The HPI igniton has two bar selectable positions. Effect on FMF factory fatty as below. :-

http://www.thumperta...achmentid=84518

[455 TT Platinum Member]

Good stuff Stimps.

Many are put off by the PC pipe feeling its soft on the bottom. But in reality its just a smooth pipe and you can see that on the dyno.

I have ridden both the PC, stock and FMF fatty back to back. The fatty is a impressive pipe, very strong, the pc takes its time and hooks up best when its slick and stock is a blend of the 2.

One thing the 4 strokes have shown me is "controllable power" is the fastest way around the track, not a big hit and lots of peak HP, but a big hit can sure be fun at times.

[4T_thumbs_down TT Bronze Member]

stimps said:

Some Tasters. I have passed the full data set to Roland to have a good trawl through and do some comparisons. Sadly I did not actually have a true shorty to test so not sure what the effect would be of that. Maybe between myself and Roland we can have a seperate area to publish some of the better comparisons. All power figures are at rear wheel, 4th gear runs, pulled from approx 3K rpm. Most pipes had 2 or 3 runs to ensure consistency, repeats were within 0.5hp between runs.


Myths Busted ( I think ).

1. Longer pipes make more top end.
2. The PC pipe has no bottom end power
3. The stock pipes are the best.
4. Spending that much money on pipes was worth it..(Personal one)

Stock 05 vs 06 front pipe. Std 05 silencer.(06 is red)

http://www.thumperta...achmentid=84508

Will take requests on others but will need some time. Can also do torque curves.:thumbsup::thumbsup:

Myth busted haha! ---- the 2005 stock pipe is better than any 2006 and up stock pipe, as some of us have opined in the past! :thumbsup: ....Another guy here at Yami 2T also felt the same way that it hit harder than the '06, and was he right! :lol: :thumbsup:

Thanks a lot Stimps! The DEP graphs were also really really nice :thumbsup:

Would it be fine should you present hp vs. rpm? :ride:

[4T_thumbs_down TT Bronze Member]

Hi Stimps,

Further to your graph on the DEP vs. Pro-Circuit vs. FMF Fatty series
http://www.thumperta...achmentid=84511

Can you incorporate in the same graph the curves for the '05 and '06 stock pipes, please? THANKS!! :ride: :thumbsup:

Ain't that SAE rating is a bit lower than the US hp rating?

[455 TT Platinum Member]

4T_thumbs_down said:

Ain't that SAE rating is a bit lower than the US hp rating?

The ratings are the same.