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Thread: uRS6+ Build

  1. #55
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    I like the new location much more.
    In fact, I'm running a very similar setup in my RS6. Only a bit bigger turbo.

  2. #56
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    Going to need pics of that nubby!

    So, been busy with it, here's a small update...


    Took the engine out. I sent the flywheel off to ClutchMasters for a new tone ring and ordered a new starter from Summit Racing. While I was waiting I put the engine back in and tried to tackle some others stuff...


    Made a full 3" turbo back with 2.5" tips.


    20200622_150641 by Joel Francisco
    2020-07-10_12-52-24 by Joel Francisco
    20200320_071737 by Joel Francisco
    20200320_072207 by Joel Francisco
    20200325_060628 by Joel Francisco
    20200325_061806 by Joel Francisco


    Got the flywheel back so I took the engine back out... reversed the coolant flow to exit the driverside instead of the passengerside and bolted everything up; put it back in the car.


    20200326_031021 by Joel Francisco
    20200326_032325 by Joel Francisco
    20200326_034545 by Joel Francisco
    20200326_202816-1 by Joel Francisco
    20200326_210516 by Joel Francisco


    Finished installing everything today with hopes to make it out the the cruise in PA this Sunday, but that's not going to happen; mainly in part to what I think it a bad CPS. Cranks but no start; nothing changed wiring wise, and I'm not getting any movement on the tach when cranking. Guess it'll sit til I can get a new one in.
    DAMN IT LOOKS GOOD...


    2020-07-17_07-46-12 by Joel Francisco

  3. #57
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    Quote Originally Posted by jolio1994 View Post
    Going to need pics of that nubby!
    I've been planning to do a build thread, once it's really ready.
    But the progress is super slow.

    Here's one of the older pics I have on hand.


    Basically it's running and driving at this point, and I'm dailying it (one of the reasons progress had slowed down). Maybe 5-8k miles on this setup so far. Makes around 600 at the crank. Clutch slipped at 650, so I toned it down a bit.

    Stock ECU, speed-density (2xMAF converted to MAP), 2 wideband lambdas pre-turbo actually doing fuel trims yadda yadda.
    Definitely not fast by today's standards, but very fun, when the boost hits.

    Anyway, this thread is about your car.
    Your exhaust might be a bit restrictive, especially for big numbers. To give you some perspective - there's like 4psi of backpressure after the turbo on a 900hp V10 with 3" downpipes. Essentially, 450hp thru a single 3".
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #58
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    Damn that is really crammed in there, but I'm sure it's a hoot! I'm hoping the 3" turboback is enough for me to see 600hp. I've thought it over long and hard and I don't want to set records, just to have a nice reliable V8T. Realistically, I want ~500 reliable horsepower; not crazy, but again I just want it reliable at this point.

    Both plastic cam tensioner guides broke on the driverside head so I'm fixing the 4 intake valves it bent up. Trying to do everything else in the meantime like rewiring the radiator fan relay harness and installing the aerocatch hood pins.

    I should hopefully have the valves in later this week...

    2020-07-24_03-15-50 by Joel Francisco
    20200719_143326 by Joel Francisco
    2020-07-26_08-33-17 by Joel Francisco

  5. #59
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    Alright alright, I know it's not a C5 RS6 Avant, but it is the C4 S6 with the BCY so close enough I suppose. I've been pouring the miles on since I last got it back together last week.

    Been pedaling it at about 1/4 throttle trying not to build boost or go over 4,000 rpm since the HPX Maf isn't tuned/scaled yet. More on that this week...
    I will be adding a resonator and mid muffler to help make it not sound like an old Ford truck..

    2020-08-09_07-50-12 by Joel Francisco
    2020-08-08_12-22-37 by Joel Francisco


  6. #60
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    I'm running a single HPX Maf in place of the stock 2x Bosch units for my single turbo setup (Currently wired for G70 MAF). The HPX pigtail is wired as it should and I'm getting +12v at the green/yellow wire, engine/chassis ground at the green/back wire, and have tested and read continuity between the green signal wire on the MAF to pin 29 on the ECU connector.

    VCDS still reads signal too low and measuring blocks 2 and 3 both show no activity for the MAF's. Also having fault codes for o2's and n75 signal too low as well... my tuner and I are stumped.

    Fuses are out of the question since I'm getting power to the MAF, no short to grounds or anything weird aswell.

    And help or suggestions are appreciated, I need to open this wastegate up!

  7. #61
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    Car's running great. This is still the first revision, but so far so good. Almost stock RS6 power with 5psi and little timing. Also only at 68% duty cycle on the stock injectors so well see how far they take me.



    Capture by Joel Francisco

  8. #62
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    Killer video man! Sounds like she's running pretty good. Sounds awesome!

  9. #63
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    Thanks man! She's a hoot!!!


    C4 chassis feels way too over powered for the torque it puts out. The brakes are inadequate and the interior feels dated; but that why I absolutely love this thing! Its a blast to drive... definitely needs a bigger rear sway bar and lsd though!

    I'm about 1000 miles into my trip, I'm about to drive back up to NJ for the last 1000 mile leg in an hour or two. Heres something to enjoy in the meantime from my dad and I having fun.



  10. #64
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    For those of us who’ve followed your conversion... what happened!? Saw your part-out on the For Sale page... very sorry to see that.

  11. #65
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    Not sure; I'm leaning towards gas. I had the tank filled by the attendant last week when I was en route to the EuropaParts Fall Foilage Cruise in NJ. On the way back home the car started misfiring really bad. I got it home and 4 of the 8 spark plugs had really bad pitting due to detonation. I replaced the plugs and it destroyed the new ones as soon as i went into boost to test.

    I emptied the tank out and put in a fresh 5 gallons of 93 octane + octane booster as well as another fresh set of plugs. It drive so much better now but #5 and #8 keep going. I had a look at piston #8 today (which is the worse) and it looks l ike the lunar surface.

    Car still drives great with new plugs and no boost. It ran awesome for 7,000 miles up until that fill-up last week... I'll be selling the old setup in the near future though.

    2020-11-01_07-15-06 by Joel Francisco
    2020-11-01_07-14-55 by Joel Francisco

  12. #66
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    That's very unfortunate...

    Looks like detonation destroyed the spark plug porcelain & that did all the mechanical damage bouncing around in that hole.
    However, if it was just one bank - I'm inclined to think, that something else happened. Either fuel starvation, or exhaust restriction. Possibly, fuel pump or FPR line. Off the top of my head, bank2 is the last to receive fuel through the stock rail setup (not 100% on that).

  13. #67
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    I read this sort of thread with the awe of someone who has nowhere near the expertise to undertake such an awesome project myself... so in that light, it’s a sad day to see the first (known) C4 RS6 Avant come and go.

  14. #68
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    It was a super fun run spoiled by some bad luck. I always like to look at the positives in life and this is no different. Now there's going to be a first ever 5.2 V10 URS6

    20201102_141337 by Joel Francisco, on Flickr

  15. #69
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    Can't count how many times this engine has been in and out in the past 2 months, but figured it's a great time to post a small update as I near the first start-up.

    IMG_20201220_151002_209 by Joel Francisco
    20201221_233625 by Joel Francisco
    2020-12-27_09-22-00 by Joel Francisco
    20201228_161106 by Joel Francisco
    20201230_195200 by Joel Francisco
    20201230_195218 by Joel Francisco
    20201230_184212 by Joel Francisco
    20201230_185730 by Joel Francisco

  16. #70
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    [QUOTE=jolio1994;294202]Can't count how many times this engine has been in and out in the past 2 months, but figured it's a great time to post a small update as I near the first start-up.

    I Love your passion man, if there were more people in the world like you then it would be a better place for sure!!

    I hope you have more luck with this one, looking forward to seeing and hearing what its like.

    Keep with the updates, i love to see what crazy stuff you have been up to!!
    2010 XC90 exec, winter machine (V8 of course)
    2004 RS6 official Canadian edition, Daytona grey, (best colour!), summer edition
    2011 Q7 TDI, general alrounder

  17. #71
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    Quote Originally Posted by fukinavit View Post
    Keep with the updates, i love to see what crazy stuff you have been up to!!
    +1 here!

  18. #72
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    I went back to work last night, but I'm not quite sure my wife was ready for me to leave yet. With being a full time student, 40+ hours a week 3rd shift mechanic, and a newborn it quickly became apparent that the cars not going to get done anytime soon...

    So I'm taking another month off to free up some time so I can finish this thing.

    I quickly threw a dual 3" to single 4" exhaust together which should suffice until if and when I decide I need a muffler. It came out decent for a day and a half build which tacking the pipes on the car with a tig torch and foot pedal... Yikes! It fits great and shouldn't pose any issues down the road.

    I also started to work on the wiring harness since it's really the only thing stopping me at this point from loud V10 exhaust sounds. The ECU's and cover on the passenger side fit like a glove, the driver side might take a little extra work.

    20210101_172747 by Joel Francisco, on Flickr
    20210105_202728 by Joel Francisco
    20210103_204941 by Joel Francisco
    20210103_210929 by Joel Francisco
    20210105_203615 by Joel Francisco
    20210105_205203 by Joel Francisco
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    20210104_150852 by Joel Francisco
    2021-01-05_11-20-28 by Joel Francisco

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