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Thread: Aprilia RS50 9 Pipe Test, the results page!

  1. #1
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Aprilia RS50 9 Pipe Test, the results page!

    For years now I have wondered how the different pipes that are available for the RS50 stack up to each other in a fairly real world environment. Well I finally got off my ass last night and went full throttle on the test. I would like to take this opportunity to thank Chuck Cofer (chuckles from the forum) for his extreme amount of labor last night on changing pipes between runs and him making his RS75 available fo the test....even installing the new piston ring to ensure good results.

    We chose to use the TP75 cylinder kit since the port timing is actually very aggressive and the TP75 is by far the most popular kit sold in the USA and probably world wide. Had we used a TP72, or a Malossi 68cc kit the "street" type pipes would have performed even better and the shorter "race" type pipes would have made less power since they are deigned for peak operation at rps's higher than the port timings of the street oriented kits.

    If you use a TP72, Malossi 68, Airsal T6 or any of the other street oriented cylinder kits you will get best results from the street type pipes....especially good looking are the Lomas and the Leo...with the stock pipe preforming admirably well.

    Here are all the pipes tested together in one graph...pretty cool:



    All testing was done on the same bike. The bike in this test is equipped with a TP75cc cylinder kit, lightly ported and with a new ring installed for the test. The motor was also fitted with a TM24 flatslide carb kit jetted with a 200 main jet, this was intentionally lean to allow the full rev out potential of the motor since this was a pipe test. The correct main jet for these conditions (58 degrees, 18% humidity and 29.71 pressure) was about 220-230. The bike was run on VPUltimate4 fuel premixed at 28:1 with an octane rating of about 93-94. Reeds were TP carbon. Clutch is a Barnett. Ignition chores were handled by a completely stock system with stock USA spec CDI unit with fixed timing at 20 degrees BTDC from idle to 15,000 rpm. Most of the pipes in the test were brand new, the used ones were clean race use only pipes with little to no carbon build up. Jetting was not changed from pipe to pipe but if it had been the results would have been higher peak power and torque numbers but little over rev past the torque peak.

    All pipes were brought to full operating temp on the dyno before testing began. This means a temp of about 600 farenheight at 5 inches down the header and at least 280 farenheight at the convergent cone prior to the stinger. Coolant temps were kept in the 50-60 degree C range. Case temps were all between 130-145 degrees farenheight. The TP cylinder was set up with a .75mm squish band width and the exhaust port opening 20mm ATDC. T1 and T2 transfer ports opened at 30mm ATDC and the total stroke was 39.3mm with an 85mm rod length from center to center.

    The only pipe I did not get to test in this series was the Gianelli which has traditionally performed very well from 9,500rpm to a max of 13,500rpm.

    The stock pipe was also tested with the stock silencer and with a slip on from an older Leo Vince three bolt system.

    All testing was performed in 4 hours of back to back runs on the same bike to eliminate as many variables as possible
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  2. #2
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Here are the street oriented pipes and then the race oriented pipes.



    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  3. #3
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Here is a fascinating look at the stock pipes. For years I have heard of people putting another silencer Arrow/Leo usually on the stock pipe and calling it derestricted....this graph will illustrate why that does not work on the RS50. The bike actually lost both power and torque with the installation of the Leo Vince silencer on the stock expansion chamber.



    Here is stock vs Arrow:



    Here is stock vs Leo Vince V6 Handmade:



    Here is stock Vs the Lomas:

    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  4. #4
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Here is stock vs: Jolly Moto RS80 Race:



    Here is stock vs Metrakit SP



    Here is stock VS the Wild Lion from Malossi....this is a pretty cool pipe with a lot of potential I think.



    And finally the strange pipe of the test. This is a custom extreme high rpm big bore pipe I am working on....IT IS NOT FOR SALE!!! I DO NOT HAVE ANY OTHER THAN THIS ONE BUILT RIGHT NOW!!! NO DETAILS ABOUT THIS PIPE WILL BE AVAILABLE...IT MAY NEVER HAPPEN....I ONLY SHOW YOU THIS SHIT BECAUSE IT IS WAY COOL IF IT EVER ALL WORKS OUT.

    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  5. #5
    apriliaforum Member armourbl's Avatar
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    Looks like you could get away with running the stock pipe if your budget was tight and still make pretty good power, about 1 hp less than with a pipe.

    Nice graphs. Looking at the MetraKit graph vs. Stock you can really see why I was always able to run my bike way past the indicated redline on the tach without a problem. I realize there isn't really any power being made up that high, but you have to run it past 12,000 rpms to get to true max mph.

    ben
    Last edited by armourbl; 12-17-2003 at 12:58 PM.

  6. #6
    Honest always, feared often Micah / AF1 Racing's Avatar
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    Craig, I am sorry but I wanted to keep all the first few posts together so I had to delete you two posts...feel free to repost now....you were just posting faster than I could keep up.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  7. #7
    apriliaforum Member armourbl's Avatar
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    I love the custom AF1 exhaust graph. When are you going to offer them to the public...

    ben

  8. #8
    Post Whore Craig's Avatar
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    LOL... u didnt name me Post Whore for nothing now did you :P

    Right as i said, great tests, thanks for taking the time to do them and the results are great! It shows how which ever pipe you choose will be adiquate, and how the specific cc pipes work (i.e 80cc pipes).

    Now before you posted the single graphs i just put together a table for BHP & RPM figures, i will post that up in a sec, take a scoure and see if its correct (ish).
    VAG Cars - www.vagcars.co.uk - North East VAG Owners Club

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    Post Whore Craig's Avatar
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    Here is the brief table i made, dont know how accurate it is.
    Attached Images Attached Images  
    VAG Cars - www.vagcars.co.uk - North East VAG Owners Club

  10. #10
    Honest always, feared often Micah / AF1 Racing's Avatar
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    15,000rpm custom pipes are a strict race only situation, this pipe on a stock oil injected bike will destroy a top end in only an hour or so...I ran it last for a reason in this test. The jetting was far to lean to show its true potential....about 17bhp on this motor.

    For 15,000 rpm use you must have at least 25:1 premix ratio and much higher octane fuel than I was using during the test. Also this rpm needs a 28mm carb or possibly larger to get the full effect.

    I have no plans to sell these pipes any time soon, they will have to go through much more vigorous testing before they are even seen.

    A 15,000 rpm pipe on a street bike would be the lamest thing ever, you have to slip the clutch from about 12,000 rpm just to get off from a start. Power does not even began to build until past 10,000 rpm.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  11. #11
    Post Whore Craig's Avatar
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    Ohh and i forgot, i also put if you could test an SP7- pipe with an SP70 kit one day try to do so the results should be alot better! as the pipes are actually made for the SP70.
    VAG Cars - www.vagcars.co.uk - North East VAG Owners Club

  12. #12
    Honest always, feared often Micah / AF1 Racing's Avatar
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    No body has mentioned the real lesson....notice that even the best pipes for a given rpm still give up some power below the peak to the stock pipe.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

  13. #13
    apriliaforum Member armourbl's Avatar
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    Yeah, my RS doesn't make much power below 8,000 rpm, and it comes on strong around 10,000. Its ok though if you don't really care about drag race starts. Corner speed and top end are much more important to me.

    ben

  14. #14
    Post Whore Craig's Avatar
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    Ahh i see what you mean the stock pipe has a better curve, for accel etc... and how the stock pipe makes better power at the low rpm's

    Where as the aftermarkets are sluggish, also the Stock pipe didnt do too bad, now when i added my can i actually did gain.

    Any idea how accurate the table i did is?
    VAG Cars - www.vagcars.co.uk - North East VAG Owners Club

  15. #15
    Honest always, feared often Micah / AF1 Racing's Avatar
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    You are pretty much on the money Craig.
    Diminished expectations is the key to happiness in life.

    Micah Shoemaker
    AF1 Racing
    699 W. San Antonio
    New Braunfels, TX 78130
    830-626-3966
    micah@af1racing.com

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