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[smoky]

I got the Johnson CM90 pump. Pretty kick ass pump. I have probably around 40 feet of 3/4 hoses in the car and it flows 6gpm. It seems to consume around 7-8 amps when car is running at 13.8V.

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[pcampbell]

Can anyone tell me what adapter you are using for a type 14 to get onto the TB? The TB is 2.8" OD and the AWIC is 3" OD so I guess we'd need a very short 3" to 2.75" coupler... the shorter the better because length is what is going to make the type 14 hit the firewall, or not. Hoping we could fit the 2.75 coupler on the 2.8" Throttle body.

https://www.ebay.com/i/261697636972?...iABEgKlzPD_BwE maybe???

I am curious how big of a difference eliminating "intake" restrictions will make. My current type 13 AWIC restricts at 2.5" OD while my SC outlet and Throttle body are both 2.75" OD.

[pcampbell]

Originally Posted by smoky

I got the Johnson CM90 pump. Pretty kick ass pump. I have probably around 40 feet of 3/4 hoses in the car and it flows 6gpm. It seems to consume around 7-8 amps when car is running at 13.8V.

I am wondering how much the pump size affects IATs. I have the regular Bosch pump which people seem to say is 5.28 GPM. There is a pump called Craig Davies 9040 that flows almost 2x as much.

Your Johnson CM90 says way more than 6gpm - is 6gpm what you actually measured?

Johnson CM90 says 17 GPM - it says magnetically driven ball bearing but not brushless.
https://www.hodgesmarine.com/joh10-2...172gpm--1.html

Craig davies says 9.7gpm and is brushless
https://www.jegs.com/i/Davies-Craig/...-9040/10002/-1

Both around $200. By the specs, one would think the Johnson flows more. Is more == better?

Johnson specs:
https://www.pumpvendor.com/media/joh...7-1_series.pdf


My setup is Type 13 intercooler
Frozen boost type 118 radiator which is pretty big but I only have so much of it exposed to air unfortunately. I've already hacked up the bump cover to get about 15% more radiator exposure.



Bosch pump.
I am seeing 100F IATs after a max boost pull, which is probably a 100F drop. Note, vehicle speeds are pretty slow in this scenario, I imagine faster speed would cool better. I'm willing to spend $200 on a better pump if it means lower IATs.

[pcampbell]

It is possible I might fit one of the larger “600hp” straight through square style units. I’m not positive.

[smoky]

Originally Posted by pcampbell

Your Johnson CM90 says way more than 6gpm - is 6gpm what you actually measured?

Yes 6-7 gpm is what I measured filling some container at the end of the loop, there is a few smaller fitting in the loop, so I'm probably more around 0.5 inch hose size equivalent flow. The 1.5 inch should flow 2-3x more than the 0.75 inch version which I'll be trying over winter with 1 inch hoses, should increase flow a lot, expecting to double it.


Brushless is coming slowly, my feeling is the Johnson 1.5 is still flowing more for now.



Your intercooler will heatsoak a bit when doing lapping and will a bit more if doing autocross base on my experience. More flow will help get the intercooler to the water temp faster. Your IAT on 1 pull should be the same with more flow, it's your IAT after many fast pace pull that will change.

[pcampbell]

Cool - I am leaning towards trying the Johnson pump if I can make it fit. Looks like it’s a bit larger than the Bosch. It is a street car but I would like to try it on the drag strip eventually.

[Bluedragon87]

@pcampbell: First of all, I'd try to fit a type 14 Charge Cooler. That fitted just fine in my Forester SG.
Do you have a reservoir of some kind? Could you measure your water temperature anywhere?
E.g. If your water temperature after the charge cooler stays more or less constant during WOT but your IAT are increasing significantly may indicate a too small charge cooler (or too less flow).
I decided for myself that I don't want to face the latter one and that's why I'm using a c
Pierburg CWA50 water pump which is actuated by my fog light switch. I have a reservoir after the charge cooler and my temps are +- 2 Kelvin identical to the measured IAT, measured directly at the endtank of the charge cooler.

[Voodoo Rufus]

Granted intercoolers don't have high liquid pressure drops, but the max head on the Davies Craig is ~12psi, and the Johnson pump is losing a lot of flow at .4bar (6 psi). The Johnson pump is a brushed motor as well. You do want the highest flow rate possible, but you need to consider the "dyno curve" of the water pumps to estimate how much flow you will get when you put them under load of the intercoolers, tubing runs and fittings.

[pcampbell]

Originally Posted by Voodoo Rufus

Granted intercoolers don't have high liquid pressure drops, but the max head on the Davies Craig is ~12psi, and the Johnson pump is losing a lot of flow at .4bar (6 psi). The Johnson pump is a brushed motor as well. You do want the highest flow rate possible, but you need to consider the "dyno curve" of the water pumps to estimate how much flow you will get when you put them under load of the intercoolers, tubing runs and fittings.

Thanks, does the Davies Craig actually flow more under pressure? I'm not sure how to make an apple to apples comparison...

[Voodoo Rufus]

Here are their performance charts from the manufacturer:
https://daviescraig.com.au/electric-booster-pumps

The EBP40 should do just fine. Otherwise you'd be stepping up to a EWP80. It flows more but has less static pressure. Plus having to use flanged connections instead of hose barbs could be annoying.

The Bosch Cobra pump here ( http://www.frozenboost.com/liquid-ai...02-p-1001.html ) looks to have far less static pressure and zero pressure flow rate to the EBP40, and it's an OEM class product.

If I were designing from scratch I'd go with the EBP40.