High IAT2 temps and KR

Lando217

Well-Known Member
Thanks for the info!
Have you tried the pump two pump idea? I've read on the cobalt forums that adding a second pump doesn't add anymore flow? i can see helping with circulation so one pump it not doing the whole loop, with two pumps it will distribute the work load.
But a lot of people on the cobalt forums speak and post without any actual facts.
i would trust the Goblin forum 10 fold.
Varimax pump is another option if you can find one, but most places are showing it out of stock.

Lingenfelter has several options; Fans / Pumps & Cooling Accessories: Lingenfelter Performance Engineering

I still think the most cost effective thing to do if you have a standard Bosch pump is to add another one of the same pump for sub $100.
 

Tim Moland

Well-Known Member
Tim Are you talking about the High output ZZP pump? the one with some red casing on it? iv been checking weekly because they are sold out. Have you seen any other upgraded pump brand?
Yes, the zzp pump with the red casing is what I am using. There are several other pumps out there, including some people using irrigation/water feature pumps, but I don't know anything about them.
 

Gtstorey

Well-Known Member
Thanks for the info!
Have you tried the pump two pump idea? I've read on the cobalt forums that adding a second pump doesn't add anymore flow? i can see helping with circulation so one pump it not doing the whole loop, with two pumps it will distribute the work load.
But a lot of people on the cobalt forums speak and post without any actual facts.
i would trust the Goblin forum 10 fold.
My background with pumps says it will flow more. I have done it on my Camaro, but I didn't set things up to test it. That is the hard part of knowing whether it makes a difference is finding a good way of testing it. Unless someone installed a flow meter they would have trouble testing the real difference.

You will want to put them in series and not parallel. The flow won't double with 2 pumps, but would likely be between 25% and 50% increase.

I would stay away from the cheap bilge/water feature pumps. Most of those are not designed for the amount of restriction in an automotive type system (not to mention elevated temperatures) and the stock Goblin system will have more restriction than your normal front engine car.

If my relocated and larger heat exchanger doesn't get enough air flow and I try the stock system, I will likely use a pump on the hot side just prior to the heat exchanger (to give the water time to cool off some) and one in the rear prior to the intercooler, although the math would say that on a closed loop system it shouldn't matter where in the loop they are located.

Here are a couple of links that contain pump curve comparison between various pumps.
intercooler pump alternative. | Cadillac CTS-V Forum (ctsvowners.com)
Lingenfelter Intercooler pump flow testing results | FI Interchillers
The hard part is knowing where on the curve (what your resistance to flow is) to figure out what pump is best for each application.
 

Desert Sasqwatch

Goblin Guru
I would stay away from the cheap bilge/water feature pumps. Most of those are not designed for the amount of restriction in an automotive type system (not to mention elevated temperatures) and the stock Goblin system will have more restriction than your normal front engine car.
How high of a fluid temperature is expected in the intercooler/heat exchanger system? 100F? 125F? 150F?
Nominally one should expect ambient plus the average temperature that the heat exchanger system can not effectively dissipate. There will be latent temperature spikes if you're educating a Ricer Boi not mess with a Goblin, but the system will level off at it's best operating temperature.
In a good system the fluid temperature should be ambient to plus 20 degrees average. In a not so good system it could be significantly above that operating temperature. If you live out here in the desert , like I do, the system will require cooling enhancements to get it below the ambient temperature. Don't want to run at 115F and higher.
Agreed that flow restrictions have a significant affect on the efficiency of the heat exchanger system and the operating temperature. The 'stock' DF system was set up for the GM SC or similar pump for flow and pressure. The approximately 1/2 inch lines and heat exchanger are adequate to keep the fluid temperature within a reasonable range that keeps the IATs in check.
On a higher HP system it is necessary to increase flow volume, while maintaining equal pressure, which is best accomplished by increasing line size. A 3/4 inch system will flow about 70% more fluid than the stock system. This also requires a bigger pump to match the GPM capacity of the larger lines, intercooler and heat exchanger(s) that have 3/4 inch lines. There are many pumps to choose from - and some are found in the marine pump selections (not all are cheap and incapable).
I plan to incorporate a 3/4 inch fluid system that will use an adjustable pressure 5 plus GPM pump at rated pressure. Getting the correct flow rate is a factor of the pressure setting, which is checked by the spill-to-fill test (time to fill a 1 gallon container).
 
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