I have two Bosch IC pumps. I'm thinking of running them both, one pushing into the IC and one pushing into the H.E. There is room under the driver's side headlight. I could buy a higher output pump but I already have this spare. So what do you guys think?

 

I say try it and let us know if it helps. Worst case is that it flows too quickly and doesn't allow enough hang time to cool, and possible cavitation?

 

It would help, yes assuming there is a reasonable restriction in the loop. While the heat from the second pump added to the fluid would be minimal there would indeed be a performance gain. The residence time of the fluid in the HE and IC is the same overall as a slower rate due to the fluid returning quicker to the devices in the loop. The faster the fluid flows the more temp delta it sees and the better heat transfer as long as minimal heat is added via the second pump.

 

Cool! I already have them mounted actually, just gotta put my bumper back on. Also need to wire the original power lead to a relay for more amperage.

 

You know, a guy cut open his E55 intercooler and it's a 3 pass. Based on that info I think speeding up the flow will help. If it does, I'll be messing with mine.

Les

 

Two pumps can be twice the failure rate, how do you monitor the improvement??? I did a lot of testing to get to the super cooler. THe photo shows how I gauged the flow rate with about 9 different pump and h/e designs. Gotta test test test and then check........Woody
https://www.crossfireforum.org/galle...hp/photo/21482

and the album:

https://www.crossfireforum.org/galle...y.php/cat/1070


PS two similar pumps would gain head pressure, but if the flow were not too restricted, the flow rate would not rise much. Id think two in parallel would increase the flow more, but Iam not tearing the lines out again for a whim, too much bumper to remove. Id rather be RC flying my strykers.

 

Intake air temperature could be monitered before and after the 2nd pump install with Zeitronix. Should probably be done the same day driving the same way and distance to reduce variables for accurate comparison.

 

I lust for the supercooler. But, I'm not changing my intake to fit it. I drive the same work commute for 11 years now. I have an IAT gauge mounted on the dash. For better or worse I'll post results.

 

Honestly I have not opened a Bosch pump....IF it is an open impeller style if 1 fails the other will still get enough fluid flow to prevent "limp home mode". The Johnson would likely still have more flow than 2 Bosch. I have industrial magnetic flow meters here at work to measure actual flow rates but kind of hard to feed 120v ac or 24v dc to my moving car, let alone plumbing up to 150# flanges.

Parallel pumps have their own performance issues and in line nearly always has higher flow rates, that one is easy to state.

 

i have run the supercooler ala tighead1 style dual pass for 3 yrs. i thought having 20* above ambient was really doing the job. then my buddy who bracket races his slk32 is almost bone stock, homeade dual cai and dual exhaust running dr's emails complaining about his iat's. says he is at 106* to 109* at the staging lanes and sees 126* at the 1/8 and 135* at the 1/4. almost identical to me!! separated system dual pass supercooler and cm30 pump. him stock as the day it came off the line.
riddle me that batman!!!

 

quick guess...you are generating more internal heat from all your crazy mods that i only wish i had on my 32!

pardon my ignorance but i am somewhat new to tweaking these cars until I had Rudy do some work on it

what is the accuracy % of the iat sensor?
is there not enough airflow across your supercooler? need a mist sprayer?
need the fluid pressure in the cooling line, the flow rates with each pump installed, ambient air temp and fluid temp really to make decisions without assumptions

 

From my limited experience the critical factors are the flow rates and diameters of the passages in the heat exchangers. Laminar flow is seriously detrimental to the rate of heat exchange. Turbulent flow is critical, to achieve this any antifreeze/corrosion inhibitors and flow restrictions should be kept to the minimum where possible.

 

I have a single pass gallon "super" cooler and my IAT's on the street are 20º over ambient. I don't know what's going on but I'm going back to the stock H/E to find out. With the super H/E I see 180º peak IAT's. I never logged with the stock H/E so let's see what happens. After I switch and learn what I can, water/meth injection is planned. My real motivation are my ECT's. I hope to lower them some by uncovering the radiator and even more with the water injection. I've often wondered if a stronger pump would lower the IAT's, now we'll learn something.

Les

 

32crazy are you using the factory to factory IAT readings?? You should cool much faster.

Did you gasket the core so that all the fan air goes thru the supercooler? Air will shunt the cores if there is any gap, reducing the benefits.

Here are some of my photos and videos, I got 4.0 GPM with the lower restriction HE and the better pump from Needswings. Stock flow was about 1.5 GPM. Enjoy. Woody

Heat exchanger up grade for SRT-6 part 3 - YouTube

https://www.crossfireforum.org/galle...y.php?cat=1728
cooling photos

MIR race of Crossfires - YouTube

Cooling video on track, check out the delta t across the heat exchanger, left hand meter.


Woody

 

Well ,the coolant goes like hell. I didn't get the bumper on so no temps yet. If I unplug either pump it still flows through.

 

woody readings come from the obdII into my dashdaq. the reclaim is fast enough cooling starts as soon as i get out of the throttle and by the time im at the pits im back down to 100* or so. my point was that him with completely stock cooling and me with all the cooling mods available we have the same temps during the run

 

worked on pumps for the last 30 yeare,, if one of the pumps flows less than the other,, the other will cavitate,, we never put pumps to pump in a circle but the larger flowing pump must pump into the smaller flowing pump,this will increase pressure, if both pumps flow the same it will work and your flow will increase,,,just remember if the water goes through the HE too fast it will not have time to cool. try it and let us know, jim

at 65 mph my iat's are 5 to 9 degrees above ambient temperature
at 75 mph 11 to 15
at 85 mph 20 to 25

 

"The residence time of the fluid in the HE and IC is the same overall as a slower rate due to the fluid returning quicker to the devices in the loop."

Great explanation!!!!!

" Just remember if the water goes through the HE too fast it will not have time to cool."

Well, that seems logical also..............

These two quotes contradict. Which one is correct?

 

Now im no fluid dynamics expert by ANY means....but it seems everyone is obsessed with bigger exchangers and more flow and all, but is it possible that we have just found the limits of the intercooler? As in it just cant take out any more of the heat in the charge air due to elevated boost levels(heat). Could it be just not possible to get the IATs any lower under boost?

 

This is what I thought until I went through the car wash, got the H.E. wet and drove home. IATs plumeted while the ECTs stayed the same.