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View Poll Results: Upgrade first preference
Replace radiator 5 38.46%
Replace engine oil cooler 5 38.46%
Additional engine oil cooler 3 23.08%
Voters: 13. You may not vote on this poll

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Old 16th May 2019, 08:06 PM   #1 (permalink)
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Question Upgrade engine oil cooler or radiator first for track?

Me again...

For track use, upgrading which component is likely to have the greater reductive effect on engine temperature, the engine oil cooler or the radiator? Obviously in an ideal world, both would be changed at the same time, but I am curious to know if I decide to do one and then the other (or one and not the other), which of the two is likely to yield the colder temps and why?

I know that the engine coolant has a heat exchanger with the transmission oil, but I am rigging up a separate cooler for that as well as the rear diff.

Secondly, is it better to replace the engine oil cooler or add another somewhere else?

Also, bonus question: what is the thing that looks like a radiator directly in front of the radiator and behind the intercoolers? I briefly tried to follow the hoses to see where they went, but couldn't work it out yet. I've indicated it with the blue arrow in the attached photo.
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Old 16th May 2019, 09:56 PM   #2 (permalink)
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Air conditioning
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Old 16th May 2019, 10:11 PM   #3 (permalink)
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Ah, thanks
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Old 20th May 2019, 01:13 PM   #4 (permalink)
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Demon Tweaks currently have the Mishimoto MMRAD-R35-09 radiator with a 6% discount, which is the best price I found:

https://www.demon-tweeks.com/uk/mish...hmmrad-r35-09/

I've got the front bumper off the car, and while it wasn't the hardest job in the world, I don't particularly want to have to repeat it if not necessary, so I may do the oil cooler at the same time.

I'm wondering if I should get a GT-R specific cooler like this:

https://auto.helperformance.com/niss...ent-oil-cooler

Or a high-quality universal one like this and adapt to fit:

STD Proline oil coolers, The widest range of race proven coolers on the market! | Setrab
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Old 20th May 2019, 01:23 PM   #5 (permalink)
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oil cooler - all day long

speak to litcho
theirs is cheap and awesome
my oil temps hasnbt been over 95 since
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Old 20th May 2019, 01:31 PM   #6 (permalink)
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I think the Litchfield cooler is the HEL, they certainly look identical, same price too, within £5 or so.

I just got off the phone with one company I called to enquire about the Setrab coolers and they recommended I replace the OEM engine oil cooler with a Laminova oil-to-water (he confirmed replace, not add in-line with OEM).

This surprised me a little as though I have seen mention of them for applications such as the transmission and rear diff, I had never considered one for the engine oil. I'll possibly have enough buffer now with the enlarged radiator, still not sure about the idea...
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Old 23rd May 2019, 04:52 PM   #7 (permalink)
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Trans cooler is first concern Imo
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Old 23rd May 2019, 07:07 PM   #8 (permalink)
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trans and engine oil
depends how much track work you plan to do i guess
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Old 23rd May 2019, 10:55 PM   #9 (permalink)
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Quote:
Originally Posted by Cardiff R33 View Post
Trans cooler is first concern Imo
Agreed and it's in progress; just waiting for parts to arrive
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Old 23rd May 2019, 10:57 PM   #10 (permalink)
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Quote:
Originally Posted by L6DJX View Post
trans and engine oil
depends how much track work you plan to do i guess
My goal is to go to the Ring, not to do tons of laps, but the laps are very long compared to a 'typical' track, so one lap will equate to 7-8 laps elsewhere.
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Old 3rd June 2019, 05:00 PM   #11 (permalink)
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I sent the HEL engine oil cooler back, ordered one of these instead:

https://www.demon-tweeks.com/uk/setr...oolers-501330/

34 rows vs 14, 264mm height, same width and depth and stock.

Even with the brackets, fittings and the return postage for the HEL, it's still over £100 cheaper and should be way better.
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Old 3rd June 2019, 05:06 PM   #12 (permalink)
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The Mishimoto's core is approximately 10mm deeper than the OEM; should help things, including providing cooler fluid to the transmission heat exchanger.

61680859_10156840888473612_2208955629417005056_n.jpg

I have a Setrab SLM 14-row 420mm wide cooler going on for the transmission. Another 1-2 coolers going on for the diffs. Want to do one cooling circuit for the two diffs, with one cooler at the front and possibly another one at the rear.
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Old 6th June 2019, 07:46 AM   #13 (permalink)
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Gearbox temps are a real issue on the GTR and given the expense of getting your gearbox fixed, it would be one of the highest priority items for me.

I use the HKS kit, but have also seen that dudersvr on the GTR Forum has developed a very efficient gearbox cooling system.

Be interested to see how you mounted your engine cooler once complete?

Cheers

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Old 6th June 2019, 08:46 AM   #14 (permalink)
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Yes, I've been following dudesvr's design with minor alterations. He's been really helpful since this is my first DIY car plumbing project. I have nearly all the parts and have modified my shroud to accommodate the cooler. Just need a few more AN fittings and small sections of hose.

Will indeed post up pictures of the engine oil cooler once fitted. I checked the OEM duct last night and it will fit with some Dremel modification. I'm waiting for the brackets to arrive plus I have sheet metal in case I need fab anything. Have attached some pre-install photos (smaller cooler is for the differentials).

20190605_203015_1559807040016.jpg
20190605_202809_1559807058443.jpg
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Old 6th June 2019, 09:49 AM   #15 (permalink)
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Brackets have arrived...
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Old 7th June 2019, 07:30 PM   #16 (permalink)
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Turns out I mistakenly ordered the brackets for the diff cooler and not the engine oil cooler, so I'm having a go at creating my own brackets with the sheet metal. These are my first attempts at shaping and cutting...

20190607_192434_1559932147109.jpg
20190606_204258_1559932166504.jpg
20190606_204211_1559932190287.jpg

The thickness is spot on, but need to get a longer sheet.
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Old 11th June 2019, 08:42 AM   #17 (permalink)
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My lower cooler bracket was quite corroded, so I removed and went at it with a metal brush on an angle grinder to take off the rust and loose paint:

20190611_083300_1560238508353.jpg
20190611_083312_1560238527277.jpg
20190611_083424_1560238542325.jpg

I'll prime and repaint it by hand with some high-build all-weather paint. I also re-tapped the threads and will order A4 stainless steel bolts to replace all the OEM bolts I've removed.
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Old 11th June 2019, 09:28 PM   #18 (permalink)
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Interested in seeing the difference the rear diff cooler makes, I think the front is a little overkill.
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Old 12th June 2019, 07:44 AM   #19 (permalink)
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I'm going to be cooling the rear and front diffs together on the same circuit, in parallel; the Mocal oil pump is pretty heavy-duty and should be able to handle them both easily. Just one pump and one cooler.

The additional cost of cooling them both this way (vs rear only) is negligible, just some extra hose and a few extra AN fittings. The AN-10 hose in and out of the pump and cooler is roughly twice the size of the AN-6 hose in and out of the diffs:

20190612_074247_1560321790324.jpg

I haven't decided yet how I'll switch on the pump. I see Willall Racing turn on the diff cooler from the transmission temperature switch. I also considered having temperature switches on both diffs and turning on the pump when either reaches its threshold. I'd also like to have gauges for their temps. Will be fitting the diff cooler last, so still have some time to decide.
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Old 1st August 2019, 10:17 PM   #20 (permalink)
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Time to resurrect this thread!

Not much has happened with the car over the past few weeks. I had to come up with some custom parts to complete the plumbing:

* An oil flange to M22 adapter for the engine oil cooler 20190801_181518_1564694097829.jpg20190801_190901_1564694255661.jpg
* A rear differential drain plug with a banjo bolt thread 20190801_181542_1564694114822.jpg
* A rear jack point extension to provide enough clearance for the banjo 20190801_181656_1564694157088.jpg
* A pump bracket for the transmission oil pump 20190801_181800_1564694202067.jpg

Will be hoping to make some more progress over the coming days and weeks...
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