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  1. #1
    iron head's Avatar
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    Test XS intercooler and RR intercooler

    with the 137 ET wheel R R intercooler makes 12.2 boost and 64.9 mph 8150 AFR 12 .XS cooler boost 13 and 62 mph AFR 12.6 RPM 8180 with bleed line.The xs cooler makes more boost but hotter charge so I think the RR dose not flow as goog as the XS but makes more power Just my thoughts THAT in the sportster


  2. #2

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    With so much more boost with the XS, and significantly less top speed, I can't help but to think you're running close enough to the limiter at 8180 that it's backing off the timing on ya... especially since the AFR is more lean with the XS; that setup is trying to give it more air, but the engine isn't turning it into power. You're three MPH off with the XS... That's more than the typical gain from using and external intercooler. I have a hard time believing the charge temp is THAT drastically different to lose three MPH.
    Last edited by VX1; 08-30-2008 at 08:47 PM.

  3. #3

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    Bump for a second opinion on this before it gets lost in the shuffle. If I'm wrong about this, then this test is huge news, 3mph between ICs! I don't think I'm wrong about it though, and it might give an indication that it's still bad to be over 8100 with the '06+ ECUs, even though they raised the limiter to 8300.

    The test was:

    RR IC - boost: 12.2, 64.9 mph, RPM: 8150 AFR: 12.0
    XS IC - boost: 13.0, 62.0 mph, RPM: 8180 AFR: 12.6

    I just finished major work to mine, and was disappointed that I didn't gain any speed. The mods have my 15/19+1mm 3-blade spinning at 8160-8180 WOT now though... it would be nice to discover I still have 3 mph to gain by getting the revs down to 8100.
    Last edited by VX1; 08-31-2008 at 08:08 PM.

  4. #4
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    The airflow work I have done shows the RR IC to be very restrictive, YET, restrictive airflow yields a denser, cooler charge will be present...

  5. #5

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    If these results are valid, I will be throwing my XS in the garbage.

  6. #6
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    Quote Originally Posted by VX1 View Post
    If these results are valid, I will be throwing my XS in the garbage.


    Many of the fastest skis on this site use XS units...many don't use RR.

    His testing was for a large boat, not a ski.....2 different things.

  7. #7

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    Same engine, same pump, only difference is about 500 extra pounds of hull. Any performance differences would be exaggerated in a lighter ski, so I'm sure I've never heard someone say they've gained 3 -5mph with the RR, compared to the XS. I just think we're seeing the work of the limiter at 8180, and that would be the same for an S150 or RXT. I don't know about anyone else, but personally, I want to know the highest RPM I can aim for, before it starts losing power, and if that's 8150 instead of 8100 on the new ECUs, that would be good news to me.

  8. #8
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    Quote Originally Posted by VX1 View Post
    Same engine, same pump, only difference is about 500 extra pounds of hull. Any performance differences would be exaggerated in a lighter ski, so I'm sure I've never heard someone say they've gained 3 -5mph with the RR, compared to the XS. I just think we're seeing the work of the limiter at 8180, and that would be the same for an S150 or RXT. I don't know about anyone else, but personally, I want to know the highest RPM I can aim for, before it starts losing power, and if that's 8150 instead of 8100 on the new ECUs, that would be good news to me.

    Your motor is the same for 06-7 skis, and the PEAK POWER is 8150...so if you see 8140-8160, then you are right at the sweet spot...based on what I have seen for the 06-07 skis....

  9. #9

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    Guys, go back to the pump laws. More rpm = more power, and it's a cubed relationship. If it's turning 8180 with the XS and 8150 with the RR, then the XS is making more power period.

    Assuming VE is nearly the same and no cavitation is going on, then it's making about 1% more power. The speed loss could be caused by a lot of things.

    Mike

  10. #10
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    Quote Originally Posted by VX1 View Post
    If these results are valid, I will be throwing my XS in the garbage.
    Garbage located at 2669 Applewood Dr. !!!!!

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