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  1. #51
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    Obviously these will never be 100% lab sample quality but good enough as a comparison provided that tune, humidity, ambient temps and barometric pressure are kept relatively close...which isn't that hard really I think

    The notion of an FMIC's IAT "fingerprint" that TurboBullet brought up is actually very interesting...if you take the time to actually look at a number of logs for the same FMIC you can actually see this is fairly true and that the way IAT rises/decays for a given FMIC doesn't really vary much at all even across different N54s and ambient conditions...i actually have done quite a bit of digging and this is surprisingly very true...you can almost market an FMIC based on its fingerprint if all you were interested in was IAT suppression/control...of course, pressure drop can't be ignored either...
    Yeah the Helix typically has a bowl shaped 2-3-4 gear fingerprint where the ait drops a few degrees stabilizes then slowly rises a few degrees. If an intercooler is constructed the same way every time this should hold true on ait tests of the same car with any intrrcooler! As far as pressure drop is concerned I'd be really surprised if the AMS tested out better as the helix has almost twice as many charge rows. Things you can't forget some of the pressure drop occurs due to more efficient ait control(think of blowing 2 balloons up with air to the same pressure then putting one in the freezer until it was 20 degrees colder this balloon would have denser air and lower pressure than then the ambient balloon)
    Lastly as dbfiu had said ambient temps are very important when comparing pressure drops with the benefit going toward the cooler ambient temps!

  2. #52
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    Click here to enlarge Originally Posted by TurboBullett Click here to enlarge
    Lastly as dbfiu had said ambient temps are very important when comparing pressure drops with the benefit going toward the cooler ambient temps!
    cooler as well as dryer correct? more humid more pressure drop

  3. #53
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    cooler as well as dryer correct? more humid more pressure drop
    Yeah pressure drop testing really needs to be done with the same conditions! I'm sure DBFIU could apply a correction factor to any changes!

  4. #54
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    Click here to enlarge Originally Posted by TurboBullett Click here to enlarge
    Yeah pressure drop testing really needs to be done with the same conditions! I'm sure DBFIU could apply a correction factor to any changes!
    What would you say is the pressure drop across the rev2 helix with RB turbos at say 20psi in say 80% humidity 60F ambients? just a generalized approximation...would you say it has definitely more or less pressure drop than the KL racing fmic?

  5. #55
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    The cheap CX Racing is on the way so I'll add some photos of the fins and welds when it arrives. I was tempted to order the Godspeed as it's somehow even cheaper. $160 shipped vs. $260 shipped for the CX Racing, lol.

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    1 out of 1 members liked this post. Reputation: Yes | No
    :< CX was 140+shipping off ebay if you ordered from Just-Intercoolers(some sort of sales div. of CX) I've got some pictures of CX, looks the same as godspeed in the first post.

  7. #57
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    Looks like they raised the price, I bought it off eBay.

  8. #58
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    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    Looks like they raised the price, I bought it off eBay.
    My friend purchased the godspeed, it was complete crap. He returned it and ordered a CX racing intercooler.
    Click here to enlarge


  9. #59
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    Click here to enlarge Originally Posted by Forcefed Click here to enlarge
    My friend purchased the godspeed, it was complete crap. He returned it and ordered a CX racing intercooler.
    What was crap about it? craftsmanship?

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    Click here to enlarge Originally Posted by Forcefed Click here to enlarge
    My friend purchased the godspeed, it was complete crap. He returned it and ordered a CX racing intercooler.
    Did he order the v mount on from the first post? I have that one and I played around with a CX one today and they are identical.
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    Not sure that is a great idea as you'd still get the initial hot IAT hit to the engine before it gets the chance to cool down due to velocity of the charge...by the time the meth pump is on and meth reaches the nozzles you'd probably already shoving air at 250F into the engine and with the N54 that'd be at peak boost down low...don't know about that..
    you could just do the tubular intercooler though to assist

  12. #62
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    Click here to enlarge Originally Posted by alpinedevil335 Click here to enlarge
    What was crap about it? craftsmanship?
    Didnt fit
    Click here to enlarge


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    Click here to enlarge Originally Posted by Forcefed Click here to enlarge
    Didnt fit
    Was it the v mount? Because if so then he ordered the wrong size. If it was the one that looks like AA's new FMIC option then yes, I agree... that one is crap
    Click here to enlarge

  14. #64
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    Click here to enlarge Originally Posted by Brey335i Click here to enlarge
    Was it the v mount? Because if so then he ordered the wrong size. If it was the one that looks like AA's new FMIC option then yes, I agree... that one is crap
    Dont remember.
    Click here to enlarge


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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
    cooler as well as dryer correct? more humid more pressure drop
    In fact humid air is less dense than dry air. It sounds counter intuitive but that is how nature works!
    Some people live long, meaningful lives.

    Other people eat shit and die.

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    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    In fact humid air is less dense than dry air. It sounds counter intuitive but that is how nature works!
    makes sense though, as moisture displaces some of the air in the charge making it less dense...however, humid air should flow with more resistance, is that not the case?

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    Dont forget that humidity is a function of temperature, so humid air will inheriently be hotter and less dense than dry air, with respect to ambient conditions

  18. #68
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    Click here to enlarge Originally Posted by Tzu Click here to enlarge
    Dont forget that humidity is a function of temperature, so humid air will inheriently be hotter and less dense than dry air, with respect to ambient conditions
    Relative humidity is. The actually humidity, or grains per pound won't change until you drop below dew-point. (saturation temp)

    As your temperature goes up, it allows for more grains of moisture to be held by the air. So 90% relative humidity @ 90F is MUCH more moisture saturated than 95% relative humidity at 60F.

    In Corpus, even when it is below 60 out we still have really humid air because of the coastal climate. Hence the fog and moisture problems in vented attics here. We have to get a "Northern" to get crisp, dry air.

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    https://www.google.com/#hl=en&sa=X&e...w=1230&bih=716


    Sorry for the bad quality pic I just googled it.

    Click here to enlarge
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  20. #70
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    Feels like I'm in HVAC class again. Click here to enlarge

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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Feels like I'm in HVAC class again. Click here to enlarge

    Yes they are used mainly for HVAC systems. Haha out of all places.

    But to answer your question DZ, for the same mass flow of humid air vs dry air. The humid air being less dense will offer more frictional pressure drop.
    Some people live long, meaningful lives.

    Other people eat shit and die.

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    Click here to enlarge

  22. #72
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    We use the same data for velocity and static pressure, as well as skin frictional losses, just at a much slower rate. We only get 350-400cfm/ton (12,000BTUH) of airflow, and we keep the velocity down with higher area to cut back on noise, unless a high velocity/high static pressure system is requested. Air balancing and plenum/duct design is the one thing most HVAC companies fail at or tend to not put much effort into.

    You should never have a room +/- 3F from your thermostat, assuming your house was modeled and built properly. In zoned houses, we can get that down to +/- 1degree F or better.

    Now if only I could figure out how to do that with intake and exhaust manifolds.....

  23. #73
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    We use the same data for velocity and static pressure, as well as skin frictional losses, just at a much slower rate. We only get 350-400cfm/ton (12,000BTUH) of airflow, and we keep the velocity down with higher area to cut back on noise, unless a high velocity/high static pressure system is requested. Air balancing and plenum/duct design is the one thing most HVAC companies fail at or tend to not put much effort into.

    You should never have a room +/- 3F from your thermostat, assuming your house was modeled and built properly. In zoned houses, we can get that down to +/- 1degree F or better.

    Now if only I could figure out how to do that with intake and exhaust manifolds.....
    Just out of curiosity as I have never touched an HVAC system, what kind of velocities do you guys shoot for?
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  24. #74
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Just out of curiosity as I have never touched an HVAC system, what kind of velocities do you guys shoot for?
    It really depends on how far we need to throw the air. 300fpm (feet per minute, I'm sure you knew) is almost totally quite, but isn't going to reach across a 20' living room. 800fpm is when the noise levels really start to get annoying to most people.

    Some badly designed returns will even bend the filter, and you can hear it slam every time the evaporator fan starts up.

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    Holy $#@! I hated that graph...

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