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  1. #1

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    More home-brew turbo results!

    I know some folks have been following my build, but to re-cap. . .

    Originally, on my 2004 RXP I ran a Stage 1+ setup using a full stage 1, RR impeller, and free mod's and went 75.0 mph.

    Next, I built my own budget turbo setup using literally a 25 year old, $70 T3 60 trim turbo and a TurboXS intercooler. On some 42 lb injectors and the stock ECU, I ran 77.5 mph at 8100 rpm and 10 psi boost. Not too shabby for a total of $1,150 invested in mod's.

    I thought I was done for the year since I was out of fuel and rpm, but my new best friend Arny Gollot offered to let me borrow his Riva ECU and 50# injectors for testing purposes, which brings us to today.

    I ran it again at 10 psi on the stock ECU just to verify nothing else has changed. Again, it ran 77.5 mph at 10 psi and 8100 rpm.

    I swapped to the Riva ECU and 50# injectors while standing in cold mud, and left the boost at 10 psi. It ran 77.6 mph at 10 psi and 8150 rpm. From this, I conclude that the Riva ECU really doesn't have a more aggressive timing or fuel curve than stock, just more power-handling capability. Sooo. . . now it's time for more boost!

    2 full rounds on the wastegate rod (now, with feet in cold mud and hands on hot exhaust) got me a tad over 12 psi. The next pass netted a 79.7 mph at 8400 rpm.

    Feeling that I MUST break 80, I decided to crank the wastegate rod another 3/4 turn. That got me right at 13 psi boost and 80.9 mph at 8450 rpm. Mission accomplished!

    Keep in mind that this was all using a 15/20R +1 mm prop, stock nozzle, no wedge, and I was sitting on the seat. Air was 70 deg and water was 60.

    At this point, it does look like 1 psi = 100 rpm = 1 mph.

    Mod's list:
    Grate: $115
    Used 15/20R prop: $175
    Very used T3 60 trim turbo: $70
    XSpower intercooler: $115
    Stainless piping and flanges: $250
    Misc. hoses and fittings: $150
    Rude exhaust tip: $115
    Riva ECU: $900 (Jerry, PLEASE talk Riva into going back to the $600 price!)
    50# injectors: $200

    So, for a total of $2,100 in mods, I'm riding an 81 mph ski. To top that, I really think a smaller nozzle and a tad more boost could pretty easily get me to 83 and still be under $2,500 in mod's. [disclaimer]Of course, don't try this at home. There are some reliability items that such as the Riva valvetrain, heat insulation, and a BOV that I'm temporarily going without. Furthermore, I'm pretty handy with a welding machine, a side grinder, and a band saw, so that saved me a bundle, not to mention a favor at a local machine shop. Welding up the jacketed intermediate pipe and getting it to successfully pass a pressure test almost sent me to the asylum.[/disclaimer]

    I can't thank Arny enough for letting me borrow the ECU, and the rest of the community for speeding up my learning curve tremendously!

    Mike
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    Last edited by engineermike; 02-17-2008 at 09:57 PM.


  2. #2
    ARNYGOLLOTT3's Avatar
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    Awesome Results....thanks for sharing...glad I could help!

  3. #3
    Moderator The Bandit's Avatar
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    That is just great Mike. You definitely have a fast learning curve.
    Last edited by The Bandit; 02-17-2008 at 10:06 PM.

  4. #4
    BLACK MAGIC HEADERS hydrojunkie's Avatar
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    i know all about welding outer jacket tubes so they dont leek, not fun at all

  5. #5
    Site Admin Green Hulk's Avatar
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    Throw a 15.5/22.5 Skat impeller in that bitch along with an 81 mm nozzle and crank the boost up to 18 psi. Don't be skeered
    Oh, don't forget the RRFPR

  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by engineermike View Post
    Riva ECU: $900 (Jerry, PLEASE talk Riva into going back to the $600 price!)
    Not going to happen. Don't be surprised if the price goes up soon.

  7. #7
    Student of Speed rxpwhistler1's Avatar
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    ECU

    Are you running the stock valve train? That is pretty impressive results esp given the fact that the turbo you used was old news. For under 2K you certainly cannot beat that performance.

    Nice work my friend.

  8. #8
    JD 1's Avatar
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    awesome results .........I was going to ask the same thing, I hope you adressed the head

  9. #9

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    Quote Originally Posted by rxpwhistler1 View Post
    Are you running the stock valve train? ...
    Yes, the long block is un-touched. I knew I was risking it going in, so I was just very careful not to let the pump lose suction. I made it through the day, so I pulled the Riva ECU off as soon as I got home.

    Mike

  10. #10
    West Texas RXP skoepp's Avatar
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    awesome results and thanks for sharing to the forum

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