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Old 08-18-2022, 12:09 PM   #351
Voodoo Rufus
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If you already built your AWIC loop, you could just test by measuring how much flow goes into a bucket per certain amount of time.

The Pressure vs. Flowrate curves of the pumps will tell you what they're capable of. Finding the P-Q curves for the intercooler and heat exchanger might be more difficult though. If you could find them then you could calculate a rough real world flow rate.
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Old 08-18-2022, 12:10 PM   #352
Voodoo Rufus
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Member#: 151528
Join Date: Jun 2007
Chapter/Region: BAIC
Location: Bakersfield, CA
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2015 STI Launch Edn.
WRB!

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If you already built your AWIC loop, you could just test by measuring how much flow goes into a bucket per certain amount of time.

The Pressure vs. Flowrate curves of the pumps will tell you what they're capable of. Finding the P-Q curves for the intercooler and heat exchanger might be more difficult though. If you could find them then you could calculate a rough real world flow rate.
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Old 08-18-2022, 12:14 PM   #353
pcampbell
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Just had a thought… do you think hooking up a cheap flow gauge in line would be an accurate way to test the effectiveness of one pump versus another? I’m specifically interested in the Bosch cobra versus the brushless Davies Craig.

https://www.amazon.com/CGOLDENWALL-E..._id=3206433011
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Old 08-18-2022, 02:46 PM   #354
pcampbell
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Quote:
Originally Posted by Voodoo Rufus View Post
If you already built your AWIC loop, you could just test by measuring how much flow goes into a bucket per certain amount of time.

The Pressure vs. Flowrate curves of the pumps will tell you what they're capable of. Finding the P-Q curves for the intercooler and heat exchanger might be more difficult though. If you could find them then you could calculate a rough real world flow rate.
i can't figure out how i'd measure it into a bucket while replenishing the suction side haha. Maybe if I had a helper re-fill my reservoir while I was measuring the pressure side...

I know I've looked at the flow charts under pressure a few times. The davies craig flows quite a bit better under higher pressure. the thing is I don't know how much pressure or head there is in the system. Basically trying to justify the cost of the new pump
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Old 08-18-2022, 02:52 PM   #355
Voodoo Rufus
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The Bosch Cobra is an OEM spec'ed pump. I'm sure it's fine for most reasonable duty.

I tend to like overkill setups, so I'd probably splurge on the pump.
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Old 08-18-2022, 03:31 PM   #356
pcampbell
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Hi thanks, yeah I think I will just pull the trigger and try it eventually haha

I looked again and the big thing seems to be that under pressure the Davies Craig out performs it by a lot. At ~200hpa it's not a big difference - ~1500lph vs ~1800 lph. 200hpa is 2.9 psi. I have no concept of what sort of resistance is in the system though.

But at 450hpa the Bosch at 500 lph and the Davies Craig is at 1200+ lph. If we are to believe the data sheets and if I converted them correctly! That is 6.5psi.

Even if the system resistance is only 150 hpa, I think it's a ~20+% improvement in flow on paper.

I've got a Type 13, but I've got a fairly large radiator out in front with lots of 90 degree bends....

Bosch cobra


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