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Combating overheating w/ Vortech + A/C

Old Apr 28, 2017 | 03:25 PM
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Default Combating overheating w/ Vortech + A/C

Alright, I'm just curious on everyone else's cooling methods on their setups.

My car runs normal easily w/ steady oil temperatures at 185-195 on an 85'F day.

Today we finally got the A/C charged and on 90'F weather, I'm dealing with the
OEM temperature gauge hitting 65-80% and oil temps at 240'F.

For cooling, I'm running a basic 10"x 5"x 1.5" 6 row oil cooler + OEM oil cooler. Mishimoto radiator and slim fans w/ Amsoil Water Wetter @ 70/30 water/coolant mixture.

I have the Treadstone 1245 Intercooler up front blocking a big area of flow and a top radiator shroud plate.

Right now I'm considering in upgrading the passenger 12" Mishimoto slim fan to a Spal 16" Extreme 3000cfm fan but I'm worried it might not be enough. I've considered rotating the blower to around 5-6 o' clock and creating space for bigger fans since the blower to intercooler pipe makes room difficult.

Seeing what everyone runs and their thoughts.

Last edited by 0taku; Apr 28, 2017 at 03:26 PM.
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Old Apr 29, 2017 | 09:29 PM
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I'm not a huge fan (lol) of the aftermarket(Koyo, Mishi, etc.) drop-in / OEM-replacement radiators as I think they are mostly hype. Physics is physics and heat transfer is heat transfer - doesnt matter who made the heat-exchanger.

Your fans arent your problem ... above 30mph passive airflow does all the cooling.

Look at the math:
lets assume your radiator is +/- 4 square feet (2ft wide by 2ft tall).
3000 cfm is 50 cf per second
divided by a 4 square foot radiator is 10.5 feet per second ... 10.5 feet per second is 8 mph...thats what that upgraded fan is doing...fans arent your issue!

Caveat - if you're over heating in congested traffic than yes, fans are your answer

I run a massive (and I get **** for this all the time) 4 core C&R nascar hammy-down radiator with a single 16" spal. In 90 degree heat, in traffic (yes, not generating as much heat as WOT runs) I hover between 185* and 205* as controlled by my single 16" spal and passive air flow.

You got a picture of your IC fins? They should be allowing enough airflow to satisfy your radiator? and depending on how much heat is being generated by your blower it'd be hard for me to imagine that your IC is saturating the passive air to the radiator.

Where is your oil cooler located?

I specifically moved my radiator & IC forward about 6" to allow as much air flow to and through them. All my coolers (PS and two oil coolers) are on the sides where they can get uninfluenced ambient air and dont negatively impact the IC or radiator.
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Old May 2, 2017 | 08:30 AM
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Originally Posted by 0taku
Alright, I'm just curious on everyone else's cooling methods on their setups.

My car runs normal easily w/ steady oil temperatures at 185-195 on an 85'F day.

Today we finally got the A/C charged and on 90'F weather, I'm dealing with the
OEM temperature gauge hitting 65-80% and oil temps at 240'F.

For cooling, I'm running a basic 10"x 5"x 1.5" 6 row oil cooler + OEM oil cooler. Mishimoto radiator and slim fans w/ Amsoil Water Wetter @ 70/30 water/coolant mixture.

I have the Treadstone 1245 Intercooler up front blocking a big area of flow and a top radiator shroud plate.

Right now I'm considering in upgrading the passenger 12" Mishimoto slim fan to a Spal 16" Extreme 3000cfm fan but I'm worried it might not be enough. I've considered rotating the blower to around 5-6 o' clock and creating space for bigger fans since the blower to intercooler pipe makes room difficult.

Seeing what everyone runs and their thoughts.

I just went through similar cooling issues..well sorta


I didn't have engine cooling issues in town on OEM fans and shroud..ac on .oil temps would often get up in the 230 degree mark with spirited driving in town [measured at the oil pan with z1 spacer thus about 6 quarts or more oil in system]
,mind you there was with a earls 5x8x2 oil cooler shoved into the front facia OEM bumper..I copied a install on the net but it had hardly any air flow mayby 60% exposed to direct flow




.but then on track.... oil temps soared to well into 290 deg and eventually on lap 5 or so of a 3 mile course I would start to see engine temps rise and would have to run cool down laps


im running a V2 and was having overheating issues on track around the 5th lap so......


I upgraded to a koyo..thinking that would help,,and it might have done the trick except I could not fit the oem fans on with the vortech pipes..


soooo.. I bought the mishimoto slim fan set up and installed that..


and that poc couldn't keep my engine temps down in regular city driving stop and go with ac on{ no spirited driving} but it fit quite well
so I decided to remove the shitty mishitmoto fans and replaced them with SPAL fans ..a 12" low profile and a 13" on the pass side


now I did not test the last set up in town with OEM bumper


I ended up getting a vented hood and a stillen V2 bumper which has a crazy amount of airflow and now temps on track never got above 210 deg..
upgraded my oil cooler to a 10x10x1.5 biggest one I can fit in the space where the window washer fluid rez was..



oil temps on laps 7-8 on track never got above 260..
engine temp never broke 210..


in town all is fine..oil 185 190 deg


and btw good luck cramming a 16" spal into the pass side..


replace the crappy mishmoto fans with a 12 and 13 that will probalbly fix the engine temps..for the oil temps you are going to need air flow and the biggest cooler you can afford and shove into the front..

Last edited by vegasanthony; May 2, 2017 at 08:49 AM.
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Old May 3, 2017 | 01:57 PM
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You may not have found in a search, but you may want to read on some cooling fan options starting from here: https://my350z.com/forum/forced-indu...l#post10849479
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Old May 3, 2017 | 03:55 PM
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Originally Posted by aarrgghh
You may not have found in a search, but you may want to read on some cooling fan options starting from here: https://my350z.com/forum/forced-indu...l#post10849479
The 14"s looks like a great idea, but I have to figure out how the clearance will be. The blower to intercooler pipe had to be in the most inconvenient location.
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Old May 3, 2017 | 08:46 PM
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this is what my measurements got me to install..as far as fitament
I had to trim the mishimoto shroud around the upper pipe ,remove the down pipe to the blower and remove the air filter, to be able to get the shroud in and out without disconnecting the upperhose of the radiator

then I installed the fans with the shroud already in place between the rad and engine


also I was able to pull the shroud out then install with the pass fan on but not the driverside fan

note this is the koyo 36mm radiator..not the 52..honestly I cant see fitting these fans with the 52mm koyo

Last edited by vegasanthony; May 3, 2017 at 09:01 PM.
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Old May 3, 2017 | 11:08 PM
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I just run distilled water+Water Wetter additive with mishi thermostat, oem rad and fans. I have No over heating issues. You can adjust the temp to where the fans kick in in Uprev and I'm sure for Haltech or other stand alones. I didnt go above 201 degrees, even in traffic.
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Old May 4, 2017 | 10:54 AM
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not vortech related......but I did this since having cooling issues with my Greddy kit. Admit I'm an electrical tard, but thought I had it all figured out to run each fan with it's own relay so they would perform optimally. Couldn't get the wiring figured out so spliced into stock fan connecters.

Works but since I installed a vented hood at the same time not sure if getting the most out of the fans. Plus have $100 worth of Spal relay kits taking up room in garage.
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Old May 4, 2017 | 11:24 AM
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[QUOTE=vegasanthony;10883541
this is what my measurements got me to install[/QUOTE]
you have no room for the air to flow through and out of your engine bay!

you have to give the air a path to go, right?
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