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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-13-2009, 10:18 PM   #61
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Nice!

If I were to nitpick, they shoulda done something similar for the charge air entries.
very hard for manufacturability, but I would like to see someone just flood the space on the intake charge end of the core with some kind of epoxy or molten aluminum to smooth it out.
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Old 07-14-2009, 01:20 PM   #62
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its under pressure. it'll make its way to the exit.
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Old 07-14-2009, 01:29 PM   #63
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its under pressure. it'll make its way to the exit.
dear mr "I want more spool!",

air that has to ram into a wall, turn around, and make another U-turn to find the right hole is slow air.

you want the inside of that core to be as funnel-y as possible.
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Old 07-15-2009, 02:33 AM   #64
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... I would like to see someone just flood the space on the intake charge end of the core with some kind of epoxy or molten aluminum to smooth it out.
Haha, I was thinking along the same lines!
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Old 07-15-2009, 01:20 PM   #65
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Ha, this is going to be my first post as a newb, but...

With those delta fins, wouldn't it be closer to ideal to have them be half rounds? As it is if you look at it you are getting 3/4ths the flow funneled through half of them, while 1/4 of the flow is going through the other half. (I am talking about external flow through the IC here). I know in actuality, you are still going to get reversion, so it isn't going to go precisely like that, but if you want to decrease your CD, that reversion is killing you. Half rounds really would be better at the leading edge, with the trailing edge getting more of a taper (although from a manufacturing perspective, I wouldn't expect better than half rounds at the tail end either.) At the very least they could have done the delta fins in such a way that the ones that essentially funneled 3/4 of the air in, would have had the same funnel going out, but instead the ones that got 1/4 of the air in get the funnel out. That being said, the deltas are reasonably rounded, so again, maybe not that huge of a difference.

Internally, I like the epoxy flooding idea, but that takes you to the flat plate that you had outside, if you want to get similarly crazy with internal flow, you would want it raised in between to deflect the flow through the IC channels. (Styrofoam rounds covered in epoxy maybe? Obviously you would want something temperature stable and light, maybe really thin aluminum sheet rounds if you felt like cutting the endcaps off and rewelding.)
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Old 07-15-2009, 02:08 PM   #66
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Originally Posted by elsdragon314 View Post
Ha, this is going to be my first post as a newb, but...

With those delta fins, wouldn't it be closer to ideal to have them be half rounds? As it is if you look at it you are getting 3/4ths the flow funneled through half of them, while 1/4 of the flow is going through the other half. (I am talking about external flow through the IC here). I know in actuality, you are still going to get reversion, so it isn't going to go precisely like that, but if you want to decrease your CD, that reversion is killing you. Half rounds really would be better at the leading edge, with the trailing edge getting more of a taper (although from a manufacturing perspective, I wouldn't expect better than half rounds at the tail end either.) At the very least they could have done the delta fins in such a way that the ones that essentially funneled 3/4 of the air in, would have had the same funnel going out, but instead the ones that got 1/4 of the air in get the funnel out. That being said, the deltas are reasonably rounded, so again, maybe not that huge of a difference.

Internally, I like the epoxy flooding idea, but that takes you to the flat plate that you had outside, if you want to get similarly crazy with internal flow, you would want it raised in between to deflect the flow through the IC channels. (Styrofoam rounds covered in epoxy maybe? Obviously you would want something temperature stable and light, maybe really thin aluminum sheet rounds if you felt like cutting the endcaps off and rewelding.)
yes you would want round leading edges. Which is usually what most tube and fin ICs are.

yes you would want funnel shapes in the end plates rather than flat. that's hard though.

interesting picture:


interesting article from which it came:
ARE Cooling (Aluminium Radiators & Engineering P/L)
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Old 07-15-2009, 02:11 PM   #67
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Quote:
Originally Posted by elsdragon314 View Post
Ha, this is going to be my first post as a newb, but...

With those delta fins, wouldn't it be closer to ideal to have them be half rounds? As it is if you look at it you are getting 3/4ths the flow funneled through half of them, while 1/4 of the flow is going through the other half. (I am talking about external flow through the IC here). I know in actuality, you are still going to get reversion, so it isn't going to go precisely like that, but if you want to decrease your CD, that reversion is killing you. Half rounds really would be better at the leading edge, with the trailing edge getting more of a taper (although from a manufacturing perspective, I wouldn't expect better than half rounds at the tail end either.) At the very least they could have done the delta fins in such a way that the ones that essentially funneled 3/4 of the air in, would have had the same funnel going out, but instead the ones that got 1/4 of the air in get the funnel out. That being said, the deltas are reasonably rounded, so again, maybe not that huge of a difference.

Internally, I like the epoxy flooding idea, but that takes you to the flat plate that you had outside, if you want to get similarly crazy with internal flow, you would want it raised in between to deflect the flow through the IC channels. (Styrofoam rounds covered in epoxy maybe? Obviously you would want something temperature stable and light, maybe really thin aluminum sheet rounds if you felt like cutting the endcaps off and rewelding.)
Holy ****, a smart noob?
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Old 07-15-2009, 02:19 PM   #68
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Maybe this is why ARC **** is so ******* expensive...seems to be just what the doctor ordered....

"Delta-fin" construction -





Seems to have standard looking internal construction on the outlet side...but the inlet side.....

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Old 07-15-2009, 02:34 PM   #69
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I bought it thinking it was a standard tube and fin. I paid $58 shipped and sold the current one for $45...I'm not complaining. I'm curious to test out the airflow through with the fans running like Jason did.
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Old 07-15-2009, 02:39 PM   #70
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Sounds like a good deal Brain!


Another ARC shot...



Note the left side of the core is the inlet, you can see where the "air guides" are.
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Old 07-15-2009, 04:09 PM   #71
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Looks like 2/3rd cobra saw the same flow improvement results going from his BEGi B&P IC to a PWR T&F:

BEGI:


PWR:


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Old 07-15-2009, 05:33 PM   #72
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Maybe this is why ARC **** is so ******* expensive...seems to be just what the doctor ordered....

"Delta-fin" construction -

These look like nice aerodynamic end tanks.



Yum!!

Lots of details can make intercoolers (and radiators) perform better than average.
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Old 07-15-2009, 05:36 PM   #73
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Brain,

I don't think 2/3rds Cobra went from a BEGI to an AVO. I think it was from BEGI to a custom TDR one.
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Old 07-15-2009, 05:43 PM   #74
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my bad, it was a PWR actually .
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Old 07-18-2009, 04:53 PM   #75
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happy times:






I haven't logged yet, but the butt dyno says the turbo is coming on faster. Must have shaved 8-10lbs off the front going to this one.

I noticed my CLT temps on the highway stay around 194*F without the fan on a 82*F day. Before it would have been running 196-200*F with the fan running.

I didn't boost much to notice the aits, ill log a few fourth gear pulls later this week.
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Old 07-21-2009, 12:26 AM   #76
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faster spool, better response = I'm happy.

next stop, smaller trim compressor wheel, dun dun dun.
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Old 08-01-2009, 08:44 PM   #77
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I have the TDR kit in mine. It does a great job with intercooling. When the pipe from the turbo is quite hot, the pipe to the intake manifold is similar to ambient air temp.

I think part of the explanation is the ducting that causes all air to pass through the IC rather than around it.

Barry
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