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Thread: Tuning a toilet!!

  1. #1
    Senior Member MASTER BUILDER
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    Tuning a toilet!!

    I need some advice on tuning a Alcohol rons toilet system,
    I need to know egt's on idle what is optimal, so that the oil does not milk so badly, I have heard 400- 500 degrees. Right now we have it at 5200 and 1800rpm.
    I have adjusted the barel valve to get the temp up a bit.
    wonder if even higher egt's would be better but not to affect throttle response.
    anybody??

  2. #2
    Senior Member RACING JUNKIE
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    See this post
    http://forums.racingjunk.com/viewtopic.php?t=7166

    The 55 runs at about 500 degrees at 1200 rpm, we also have a highspeed leanout pill of .014 rpm activiated at 7000 rpm.

    Zip.

  3. #3
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    How does the lean out work? It is t'd on the pressure side? then back to the tank?
    did you run it w/o the leanout? if so what was the increase in trap or et?
    we have all the stuff to set it up that way but have never tried.
    what to look for on top end, for tuning ? We have a sbc 436 with some sbc heads flowed at 355cfm in. @ .700 lift,
    nozzles are 36 and return pill of 88 in there. gold 1/2 pump I think.

  4. #4
    Senior Member RACING JUNKIE
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    If you look closely at the picture you can see the hispeed leanout at the bottom of the picture. It's electric and controled with a MSD adjustable rpm controler. Look at the barrel valve and you can see the input line in front and the return line exit toward the drivers fender, that line is plumbed into the hispeed which is activated at what ever rpm the controler is set at, then plumbed back to the tank. It actually never come into play in the 1/8 mile, but in the qtr. it picks up a few hundreds and a mile or 2 in trap speeds. This car has a gold "0" pump and #36 nozzles, so i think it might help a bigger pump a little more on top end too keep the EGT and engine temp more on a level basis. On my car i don't run a hispeed leanout, and it definately suffers on top end. running 6.52 1/8 and 10.59 only 125mph, it should 128 plus. I leave the line at at 180/190 degrees and i'm down to 160 by the time i hit traps. I can run round robin and never turn on the fan.

    JMO

    Zip.

  5. #5
    Senior Member MASTER BUILDER
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    I am having some consumption issues also with this setup. It seems, we run the car for 3-4 mins at idle and it comsumes almost one 3 gal tank.
    somethings got to be wrong with that.
    my return pill is 88. we adjusted the idle egt to 520 deg. so its ont too rich.
    is this normal? With my old setup 414 engine alcohol carb, it used maybe 2 gals a run. this one seems liek it will blow thru the 3 in one run.
    the heads are sbc old pro stock pontiac 867's reworked by Self to flow in the 355 cfm intake at .700
    Al

  6. #6
    Senior Member RACING JUNKIE
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    Sounds like it might be a leettle fat, I have been told that most of the oil dilution, happens at idle. I am far from an expert, but I did stay in a Holiday Inn last night. :shock:
    No matter where you go, there you are.
    **IN GOD WE TRUST**

  7. #7
    Senior Member RACING JUNKIE
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    Quote Originally Posted by altune
    I am having some consumption issues also with this setup. It seems, we run the car for 3-4 mins at idle and it comsumes almost one 3 gal tank.
    somethings got to be wrong with that.
    my return pill is 88. we adjusted the idle egt to 520 deg. so its ont too rich.
    is this normal? With my old setup 414 engine alcohol carb, it used maybe 2 gals a run. this one seems liek it will blow thru the 3 in one run.
    the heads are sbc old pro stock pontiac 867's reworked by Self to flow in the 355 cfm intake at .700
    Al
    That's way,way too fat. That 55 doesn't use more than 1 1/2 gal. in the qtr. and we park about the 1/8 mile mark and drive too the line and back too the pits. My 377" doesn't burn more than a 1 gal. and that's also driving to the line and back too the pits. A friend has a 1992 Camero, 434" with 2 toilet bowls on a tunnel ram weigh 2700lbs, runs 8.80/8.90 and doesnt use but about 2 gal. and that's also driving to the line and back to the pits. He has no leanouts at all, using a gold 1/2 pump.
    2 possible sineros, 1 is the pump is weak at idle and you may not be getting enough fuel flow, giving you a false egt reading. Try setting the barrel valve at 18/20% leakdown and see what the egt reading is at 1200 rpm idle.
    By the way it was 92 degrees friday nite and 78% humidity, it rained on us on the way too the track, and it had rained 2 hrs. earlier at the track. Which was one reason the track was so slick.
    Anyway my suggestion would be to first make sure the barrel valve is set in the neighborhood of 20% and we can go from there.

    Zip.

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by suicidebomb
    Sounds like it might be a leettle fat, I have been told that most of the oil dilution, happens at idle. I am far from an expert, but I did stay in a Holiday Inn last night. :shock:
    HeHE, the last time i stayed at the holiday inn, the toilet didn't work :lol:

    Zip. :P

  9. #9
    Senior Member MASTER BUILDER
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    Thanks,
    I don't have a leak down tester, where to get one? It is something special?
    I am new at this toilet stuff.
    I am pretty effecient on carbs but virtually no experiance with toilets.
    or fuel injection.
    Al

  10. #10
    Senior Member RACING JUNKIE
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    speedway sells one very reasonable, about $80.00 i think, maybe even less. you will have to have an adaptor to fit the barrel valve, it comes with a sparkplug fitting for checking cylinder leakdown. It's for sure if you're going to run injection of any kind it will come in handy.

    Zip.


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