M35 Stagea Replacement Radiator

[zei20l]

craig is having no problems with his china cheap-ass radiator, so i will have similar results.

i have a nismo thermostat in my car too. however i bet the ebay guy rorted me as nothing really changed on my car in operating temps........

[PN-Mad]

I don't know the theory behind thermostats. Sure, a nismo one opens earlier, but how can that have any effect on the overall temp of the system when running hot? An open thermostat is an open thermostat.

Sure, more coolant is better, but if it's not cooling in the radiator, then it's just a matter of time till you have twice as much coolant at a hot temp to cool down, which is twice as hard!

[iamhe77]

I don't know the theory behind thermostats. Sure, a nismo one opens earlier, but how can that have any effect on the overall temp of the system when running hot? An open thermostat is an open thermostat.

Sure, more coolant is better, but if it's not cooling in the radiator, then it's just a matter of time till you have twice as much coolant at a hot temp to cool down, which is twice as hard!

Not so much about cooling from a certain temp, but if you have a thermostat that opens earlier, then it is easier for the cooling system to maintain the lower temp as opposed to one that opens 10 degrees higher which has to work harder to bring the temps back down that extra 10 degrees.

Similar, but reversed, to boiling water - much easier and quicker to bring hot water to the boil than cold water

[HER_M35]

Not so much about cooling from a certain temp, but if you have a thermostat that opens earlier, then it is easier for the cooling system to maintain the lower temp as opposed to one that opens 10 degrees higher which has to work harder to bring the temps back down that extra 10 degrees.

Similar, but reversed, to boiling water - much easier and quicker to bring hot water to the boil than cold water

My understanding is that a thermostat that opens earlier will ensure the car takes longer to reach operating temperature, thereby running richer for longer.

It's a bit of a trade off really, it would be better on long hot drives but if you do lots of short runs your fuel economy will most likely go out the window.

I could be wrong, it's happened once before....

[ArdentEagle]

Just a quick thread bump.

I've just had my top tank go on my radiator. Are there any direct swaps readily available? I need to get my car fixed fairly quickly so I was hoping to buy local here in W.A.

If not, is this a straight swap? http://www.ebay.com.au/itm/RADIATOR-NISSAN-SKYLINE-V35-AUTO-MANUAL-2001-2007-KOYO-BRAND-NEW-/220872242160?pt=AU_Car_Parts_Accessories&hash=item336d02f3f0#ht_1906wt_1163

[zei20l]

AFAIK that is NOT a direct swap. however, with some minor trimming it should fit fine.

apparently the 2.5L models are a perfect fit for ours

[bigkevracer]

Pretty sure thats what Jase has in his, and it required a fair bit of cutting to fit.

Heard that about the 2.5L versions Iain, but are the cores the same size?

BTW what's this 'ours' buddy? Already looking at upgrading to a PM35?

[jasevr4]

Pretty sure thats what Jase has in his, and it required a fair bit of cutting to fit.

I have the full alloy Koyo 36mm radiator. Needed a bit of trimming here and there but nothing that I'd consider major.

Absolute max I've seen is 108deg on a 40deg day, stuck in traffic for about 10 minutes. Pretty rare to go over 102deg, only ever happens on a hot day after I give it some and then get caught at lights or something. Usually when I check the Informeter it it's sitting around 93-98deg.

[Akshunhiro]

Hi all, 

Sorry to bump an old thread but I'm needing a replacement after splitting the top tank. Are these eBay radiators okay? I haven't been able to find a genuine Koyo in Australia other than JustJap but they only have the S2. 

[West]

14 hours ago, Akshunhiro said:

Hi all, 

Sorry to bump an old thread but I'm needing a replacement after splitting the top tank. Are these eBay radiators okay? I haven't been able to find a genuine Koyo in Australia other than JustJap but they only have the S2. 

Contact Scotty at Scotty Customs or Fernix radiator. 

I believe Scotty help them developed a direct replacement for the M35 and not just direct fit but it's thicker too. I have one in my car.

[Akshunhiro]

Thanks, I did look at Fenix but it only looks like they do S2. 

[West]

Believe my car is a series 1, NM35. Series 2 is the 3.5ltr right?

[Akshunhiro]

Yeah although they still had the VQ25 in S2. Apparently VQ25 S1 and VQ30 are same radiator (with the mounting points on the outer-most edges), slightly different to VQ35 and S2 VQ25 (ditched the viscous fan for electric).

[West]

Give them a call man, no point wondering.

http://www.fenixradiators.com.au/M35

If your car is a series 1, which is the VQ25DET then they should have a thicker replacement radiator in stock for you, even an trans-oilcooler.

If not, give Scott and Scotty Customs a call, he might have 1 in stock.

[Akshunhiro]

So, still haven't sorted this yet haha. Probably organising to get one through my local Natrad since they can get Koyo's.

I have 2 questions though. My stock radiator is only 16mm thick. I was probably gonna go up to 26mm but will this affect clearance for A/C condensor and A/C fan? I've got room at the back with the shroud and clutch fan but slightly concerned about the front even though it may only be about 5mm difference (if they keep the core centred).

And, was probably going to get some silicone radiator hoses, are 350Z/VQ35DE the same? It looks like they are but just wanted confirmation.

I've got the coolant bypass mod from Scotty so just trying to piece everything together ready to go all at once.

[conan7772]

Hey yeah me too.

Need a replacement, not sure whether to go 26mm Koyo or 16 mm unbranded

[West]

On 5/6/2017 at 3:42 PM, Akshunhiro said:

So, still haven't sorted this yet haha. Probably organising to get one through my local Natrad since they can get Koyo's.

I have 2 questions though. My stock radiator is only 16mm thick. I was probably gonna go up to 26mm but will this affect clearance for A/C condensor and A/C fan? I've got room at the back with the shroud and clutch fan but slightly concerned about the front even though it may only be about 5mm difference (if they keep the core centred).

And, was probably going to get some silicone radiator hoses, are 350Z/VQ35DE the same? It looks like they are but just wanted confirmation.

I've got the coolant bypass mod from Scotty so just trying to piece everything together ready to go all at once.

Pretty sure the one from Fernix are 26mm and we don't have any issues with clearance.

 

[Akshunhiro]

Yeah Scotty referred me to Fenix as well but I'm being stubborn and doubting fitment due to core width. Fenix NZ lists what appears to be more suitable for S1: http://www.fenixautoparts.co.nz/index.php?route=product/product&product_id=693

I took mine out on the weekend but hadn't measured it up yet. Was just going to try get a Koyo through Natrad.

[KiwiRS4T]

Just ring the suppliers instead of speculating.