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| Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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#1 |
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Zilvia Member
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1JZ s13 cooling issue. Opinions and tips welcome.
Hey guys, I BELIEVE I'm in the correct section, if not feel free to move/close it.
I have a 1JZ hatch, non VVTI. Some relevant (to this thread) mods are: Big Mishimoto radiator ISIS FMIC AEM Standalone Brand new water pump 2x Electric fans DEFI Water temp gauge with DEFI probe I'm having an issue to where when I come off the track from a run, my temperatures are extremely high. The DEFI gauges read in Celsius and typically the temp is anywhere between 100-110 (Rougly 212 - 230F) after exiting the track. That temperature is with me not running a hood or a front bumper. I've had it get to about 100 cruising around town too, bumper on with hood. We have it tuned to where the car will shut off after anything over 230F, it hasn't shut off yet but I have had my gauge read higher than 110C, all the way up to 115 once. The only things so far that have helped is to turn the car off almost immediately, or to throw ice cold water into my e-fans. Part of the issue may be the e-fans, they are what I believe to be pullers, however they are mounted to the front of the radiator as pushers (they turn the correct way however). I can not fit any sort of electric fan in front of my engine however, or else I would run them as pullers. So what are my options? I've tried water wetter (with absolutely zero result). I suppose I could cut into the core support to move the radiator forward to attach fans to the back, but I wanted to get some input. I'd like to run a bumper and hood again. |
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#2 |
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Leaky Injector
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Well I'd first make sure you know what you have and that they are indeed working correctly. You stated you have efans that are pullers, but mounted in front of the radiator and operating as pushers. So that means you don't have puller fans. They sell fans that are only one type or both types depending on how you wire them. So if you aren't sure what you have and how they are working, clear that up first.
Second, if they are indeed pushing air through the radiator and still not getting the job done, you could invest into larger and or more effecient pusher fans. Something with better CFM rating. Third you can reposition the radiator, whether that be cutting the core support to move forward, or buying a different size radiator that will mount more forward inside the core support. Keep in mind of the AC condenser if you are running that. If not then you have more room to play with. I'm planning to possibly run a scirocco style racing radiator inside my core support to allow room for puller fans with my 2J in an S14. That is just an idea of something that would possibly work in this scenario. You'll have to do measuring to make sure you pick a correct radiator to fit the way you need it. |
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#3 |
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Post Whore!
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Do you have any ducting what-so-ever? Track cars require proper ducting to stay cool.
Also sounds like to need high CFM fans and perhaps a folder T-stat to get the coolant flowing sooner through the engine.
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#4 |
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Post Whore!
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Move the engine back some and re-think the configuration of the cooling system. Fit some fans behind the radiator and create some proper ducting. The height of the vehicle may come into play.
also consider your engine may be improperly tuned. Maybe the timing is retarded and the EGT's are blazing hot leaving your cooling system to take up the slack. Do you have an EGT gauge? |
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#5 | |||
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Zilvia Member
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#7 |
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Hey you can pm me if you have more questions but I may have your solution. I had a 1jz in a s13. I am now moving it into a s14 chasis. I am in miami. My build post is coming as soon as I finish it but back to the question at hand. You cooling issues can be solved. I would buy a thermostat that opens cooler. When you get it pm me so I can show you a trick. Also I would get actual spal pusher fans. Spal have about the most cfm that I have seen in slim fans. Compared to the ones you can pick up at autozone or discount and others that summit or Murray's sell. After you get the thermostat and do the trick try the fans after. But I'm sure the thermostat would help. I had he same problem with my 1jx inside a s13 hath with a/c tripple core champion radiator with the support cutbacks bit and flex a lites. Your radiator is smaller and i dont think you have ac so ou should be fine. Pm me if I sound too confusing.
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#8 | |
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Zilvia Member
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Thats the plan for this winter
Or rear mounted radiator if I want to get crazy, but for this season I just want to be able to drive. I don't have any welding/fabrication skills so I would have to outsource. Unfortunately that takes too much time right now!Quote:
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#10 |
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Man w/ CTSV & a Car Seat
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What kind of fans are they? Are they the generic basket style fans? If they are, try going with some shrouded dual FAL fans, put them in front of the rad and make sure they're absolutely sealed around the radiator.
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#11 | |
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Zilvia Member
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I know it sounds stupid but it's a question I have to know haha. |
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#12 |
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Zilvia Member
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Also, a friend told me this but can anyone confirm? he said that typically fans with curved blades are meant to be pullers.
So if I'm looking for pushers, I'm looking for straight-blades? |
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#13 |
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Post Whore!
![]() Join Date: Jan 2008
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Maybe I missed it in the thread history.
But, what radiator is it? For KA or for SR If its for KA with the 2 outlets on the same side the JZ motors will have cooling issues due to not using the full surface of the radiator to cool. If its a SR Rad you should have a cross over hose from driver to passenger side for the upper water neck, and the radiator will use its full surface to cool side to side. We recently finished a 2JZGTE VVTI S13 project using a Koyo N Flow Radiator with a set of the Flex A Lite 420 puller fans. We also installed an upgraded thermostat for good measure. This setup has no overheating issues what so ever. Feel free to contact me at [email protected] if I can help with anything. Thanks
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Contact: Phone - 513-874-2508 AIM - ZLR0bert Email - [email protected] Zerolift facebook - http://www.facebook.com/Zerolift |
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#14 | |
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Zilvia Member
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PRETTY sure it's a Tech2 kit, not sure though. I'm going to get a low-temp thermostat and form FAL shrouded pushers and see how it works. thanks for all of the help everyone ![]() I'll report back afterwards. |
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#15 | |
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Nissanaholic!
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Although, with that being said, if your heating situation worsens when running with a hood, then that means that your engine bay is too cluttered/tight to allow a smooth path for air flow - which seems to be pretty common with I6 S-Chassis. If this is the case, an easy way to try reduce the under-hood temps is to space up the rear of the hood, which should give the air that's gone through the radiator somewhere to go. Vented hoods are also a solid option too, a good one helps to draw through the radiator when the car is in motion. When I started doing research for my swap way back when, a lot of the JZ guys were having similar heating issues, most of which seemed to be a result of physically not being able to remove enough heat through the standard radiator without a pretty beefy fan setup or something else. One thing that I've seen that will help, or is said to help, is deleting the stock oil cooler and running an external cooler. From the factory 1JZ's (and 2J's I think) have this weird oil cooler built into the filter housing. It taps into the main external line that runs around the block from the water pump to just above the oil filter outlet on the block. Before the line goes into the block, it goes through the oil cooler, which should 'in theory' cool the oil down some, but if you can imagine, hot coolant doesn't really cool hot oil that much, and if anything the hot oil is heating the coolant more. The idea is that a separate external cooler will help to remove heat from the system by essentially adding an additional smaller radiator, and the oil won't be 'forced' to heat the coolant... Or something like that. Also, FWIW, like a bunch of people have said before, Ducting seriously makes a difference. I mocked my ducting up on the car a while back, and noticed huge gains in negative pressure in front of the car with the fans on. Prior to the ducting, I setup a series of tape strips at the lower opening of my bumper (pignose) and in the upper openings (cutouts) to see what kind of air my fans were drawing. As far as I could tell, the tape didn't move at all when the fans were turned on - after adding the ducting the same tape strips moved in towards the radiator noticeably, maybe ~.5" - .75". This meant, in a round about way, that any air that entered the cutouts in my front bumper was forced to go into the radiator (ignoring any leaks). Any who, this post was way longer than I planned, sorry... Lol. |
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#16 | |
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Zilvia Member
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TBH I don't have any data at all anymore, it was all deleted - however I don't really remember if I had the same issue with a hood or not. Next event I'm definitely going to try to run a hood with the rear spaced up, though I will say when I was cruising around town with a hood and bumper I was having an issue for sure. An oil cooler was another thing I was thinking of, if I remember correctly the stock "oil cooler" runs under the block or something crazy. I think that deleting it will make a huge difference if I run an aftermarket one. Thanks for the suggestion!! |
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#17 | |
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Nissanaholic!
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Sounds like you've got a plan though, try out different things under the same or similar conditions and see what they do. Each setup is a little bit different, so what works for some may not work as well or at all for you and visa versa. Also, change one thing at a time if you can - some people get caught up changing 2 or 3 things at once, and then you never really know what 'fixed' the problem. Here's a random picture from the net that shows the oil cooler block and oil filter pretty well: (Intake manifold was removed) To eliminate the cooler, you can more or less just loop the water line into the block without ever going through the cooler assembly - from there you can run a sandwich plate or whatever to run the external cooler. If you want to eliminate the cooler assembly entirely (worthwhile, IMO) then you'll need to find a pass through stud for the oil outlet in the block. IIRC, it's a 3/4-16 Thread, and needs to be approximately 1" long with ~12-13mm hole (1/2") through the center. There's a ford part number that fits the bill - it's E8ZZ-6890-A, or you can make your own like I did: ![]() If you've got access to a lathe or similar, making your own is trivial, I bought a 12" long threaded rod and had it all done for less than the cost of the ford part. |
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#18 | |
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Zilvia Member
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#19 |
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Man w/ CTSV & a Car Seat
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Well, dunno if 1JZs have the same issue as RBs but the oil filter snout is pretty short. When you use a sandwich block in between the filter and the filter block, the piece you thread on has a tendency to only thread on to a few threads. I have snapped the stock snout, filter fell off and loss all oil pressure before.
This is how I deleted the stock oil filter block... Installing an oil cooler on an RB25DET |
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#21 | |
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Nissanaholic!
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