Jump to content
SAU Community

Recommended Posts

  • Replies 48
  • Created
  • Last Reply

Top Posters In This Topic

I use both the pwr and a Koyo all copper radiator. Both excellent products but both pricey.

The koyo is the winner in the cooling stakes but the pwr is a good bit of kit as well.

Some things you just shouldnt skimp on. Radiators are high on that list.

there are a few Koyo radiators on eBay with a Sydney based seller going for around ~$500 [Here]

Are they fake or real? sooo cheap!

Its real thats there normal price now days, forum trader tengoku imports also have them for 500 mark, cant go past it I reckon for that price.

there are a few Koyo radiators on eBay with a Sydney based seller going for around ~$500 [Here]

Are they fake or real? sooo cheap!

The pictures on the listing is quite deceptive, cause if you read on in the description the rad is a plastic tank/aluminium core and not full alloy all-round... That's why it's selling at a cheap price.

http://www.koyorad.com/products/radiators.asp

http://www.koyoradracing.com/products/radiators.asp?make=Nissan

The all aluminum Koyo rads are definitely more expensive than that!

The pictures on the listing is quite deceptive, cause if you read on in the description the rad is a plastic tank/aluminium core and not full alloy all-round... That's why it's selling at a cheap price.

http://www.koyorad.c...s/radiators.asp

http://www.koyoradra...asp?make=Nissan

The all aluminum Koyo rads are definitely more expensive than that!

http://www.skylinesaustralia.com/forums/topic/379401-koyo-radiators/

Bought mine from tengoku for 500 and its the all aluminium one no plastic.

I actually like the look of that Koyo in post 11 , Is that a 52mm deep twin core single pass radiator and model no is ?

Theory here , mine anyway . I've had issues over the years with radiators and cooling problems and a few things are worth noting .

Aluminium radiators are heaps lighter than copper brass and tend to cool better if the core is properly made . I had constant issues with the old Subaru until I found a custom made twin row core for it , which mimiced the overseas twin core auto turbo model we didn't get here .

Just on this more cores (rows of tubes) are not better than 1 row of deep tubes becayse where there is gaps there cant be tube or fin area . The first row pre heats the second then third etc . Obviously multiple cores are better than a single narrow core if thats all thats available ie the old Subie .

I'm not criticising others but personally my preference will always be a vertical tube radiator and single pass for one very good reasons . A multi pass core won't always thermosiphon because hot water wants to rise not fall and I'm not sure how well the multi pass works after shut down . When engines get real hot they can boil the coolant and when water boils it turns to steam bubbles . I reckon in a single pass radiator and steam bubbles will collect in the top tank and hopefully be pushed under pressure out the top tube to the overflow bottle . Ideally this is what happens with the turbos water cooling after shut down .

I think the theory will multi pass rads is that each pass removes some heat but it is limited to the flow capacity of each sectioned "pass" .

Truthfully I think the more tubes you have available for a given water flow rate the slower the flow speed will be in each tube and therefore the greater time spent there to reject any heat . Just my thoughts .

That aside I want something that looks like a radiator and it doesn't have to be shiny only functional . I really like the look of that Koyo above because it slopes down on the top tank like the OE one next to it and I guess that means its an exact replacement - ie the std airboxes inlet fits as per normal ?

Some weird ones I saw pictures of have a "stepped" section on one side and it looks really agricultural to me as not happening in my car .

With this Koyo does the std fan shroud fit in exactly the same place as with the std radiator , I like things as std as possible in this area .

I like Japanese made parts and I think you pay a bit more for something that does more than look the part .

Thanks in advance , cheers Adrian DP03 .

Sorry didn't see this thread had a second page , I think the Koyo R33s radiator is part no R020442 but not sure if its multi pass like some Koyos appear to be .

Found this .

  • R and V Series Core - Koyorad (Koyo) Racing Aluminum Radiators are available in R-Series (53mm) and V-Series (36mm) cores to provide a greater coverage for various types of engine tuning. The thickness of Core is noted by a "R" (R-series) or "V" (V-series) at the beginning of the product number.
  • Nocolok Brazing - Each Koyorad (Koyo) Racing Aluminum Radiator has Tubes, Fins, Headers, and Brackets are brazed in a state-of-the-art Nocolok Furnace, bonding all components into an indestructible radiator.
  • OE Specification Mounting - All Koyorad (Koyo) Racing Aluminum Radiator have fan mounts situated to OE specifications allowing for both stock and performance fans to be used.
  • Hand-crafted Heliarc Soldering - Each Koyorad (Koyo) Racing Aluminum Radiator is TIG-welded by hand with Heliarc soldering. Heliarc soldering is the highest in industry standard for welding aluminum connections.
  • Tube and Fin Alignment - Koyorad (Koyo) Racing Aluminum Radiators are crafted under strict quality control and solid boxing result in pristine tube and fin alignment, fresh from the factory.
  • Mirror Finish - Koyorad (Koyo) Racing Aluminum Radiators have all aluminum surfaces buffed before boxing to a confident mirror finish.
  • N-Flo Construction (Multi-Pass) - Koyorad (Koyo) N-Flo Racing Aluminum Radiator have strategically placed partitions make for a "N" or "U" shaped flow through the radiator. This allows for improved cooling efficiency compared to normal all-aluminum racing models. (N-Flo models are denoted by a "N" at the end of the product number)

So I guess with no "N" on the end of the part number the Koyo R type Racing R33 GTR/GTS25T R020442 radiator doesn't have this multi pass business , just need a good price now .

A .

Edited by discopotato03

With this Koyo does the std fan shroud fit in exactly the same place as with the std radiator , I like things as std as possible in this area .

I like Japanese made parts and I think you pay a bit more for something that does more than look the part .

Thanks in advance , cheers Adrian DP03 .

Yes perfect standard fit, my 53mm dropped straight in like a standard one, airbox would fit to.

Sorry didn't see this thread had a second page , I think the Koyo R33s radiator is part no R020442 but not sure if its multi pass like some Koyos appear to be .

Found this .

  • R and V Series Core - Koyorad (Koyo) Racing Aluminum Radiators are available in R-Series (53mm) and V-Series (36mm) cores to provide a greater coverage for various types of engine tuning. The thickness of Core is noted by a "R" (R-series) or "V" (V-series) at the beginning of the product number.
  • Nocolok Brazing - Each Koyorad (Koyo) Racing Aluminum Radiator has Tubes, Fins, Headers, and Brackets are brazed in a state-of-the-art Nocolok Furnace, bonding all components into an indestructible radiator.
  • OE Specification Mounting - All Koyorad (Koyo) Racing Aluminum Radiator have fan mounts situated to OE specifications allowing for both stock and performance fans to be used.
  • Hand-crafted Heliarc Soldering - Each Koyorad (Koyo) Racing Aluminum Radiator is TIG-welded by hand with Heliarc soldering. Heliarc soldering is the highest in industry standard for welding aluminum connections.
  • Tube and Fin Alignment - Koyorad (Koyo) Racing Aluminum Radiators are crafted under strict quality control and solid boxing result in pristine tube and fin alignment, fresh from the factory.
  • Mirror Finish - Koyorad (Koyo) Racing Aluminum Radiators have all aluminum surfaces buffed before boxing to a confident mirror finish.
  • N-Flo Construction (Multi-Pass) - Koyorad (Koyo) N-Flo Racing Aluminum Radiator have strategically placed partitions make for a "N" or "U" shaped flow through the radiator. This allows for improved cooling efficiency compared to normal all-aluminum racing models. (N-Flo models are denoted by a "N" at the end of the product number)

So I guess with no "N" on the end of the part number the Koyo R type Racing R33 GTR/GTS25T R020442 radiator doesn't have this multi pass business , just need a good price now .

A .

Koyo Radiator Group buy.....Im in.

Koyo Radiator Group buy.....Im in.

I'm keen too, so is Ph@t-G, we could hit up this guy

http://stores.ebay.com.au/RADIATORSS?_trksid=p4340.l2563

He's in Sydney, inspect, pickup, pay cash. However, I am not organising, too much responsibility and headache lol

Il see what i can do- Anyone intrested drop me a PM and if its worth while price wise im start an official thread in the group buy section

Also located in sydney so i dont mind being used as the pick up place to save on delivery costs ect.

  • 2 months later...

Has anyone been able to compare the Koyo Type-R for R34 GTRs compared to Racepace's triple pass radiator?

I've emailed them a few questions regarding fitment, etc and I don't want to hassle Ash with the Qs :P

  • 1 month later...

Has anyone been able to compare the Koyo Type-R for R34 GTRs compared to Racepace's triple pass radiator?

I've emailed them a few questions regarding fitment, etc and I don't want to hassle Ash with the Qs :P

any more on this? i need a new rad too, its a toss up between the racepace and Koyo

  • 5 months later...

I had a FENIX rad, cost $250 a couple of years ago and was a great fit, could still use the shroud as well.

Did lots of track days and drags and never had a over heating issue, only problem was driving up the mountains with 0 deg temps when the coolant temp dropped so far I thought the sensor was broken.

There is a tread in the SAUNSW members sponsors area.

http://www.skylinesaustralia.com/forums/topic/314551-great-deals-on-radiators/

Any more thoughts on good radiators ?

Justjap have Blitz and Cooling Pro radiators, are these any good or should i just stick to a Koyo ?

cooling pro are piss poor. the standard airbox scoop doesn't fit over it and the coolant temp sensor bung on mine doesn't quite seal properly and it has an extremely slow weep of rad fluid.

that said, you should buy mine so I can put a FENIX in. :P

I had a FENIX rad, cost $250 a couple of years ago and was a great fit, could still use the shroud as well.

Did lots of track days and drags and never had a over heating issue, only problem was driving up the mountains with 0 deg temps when the coolant temp dropped so far I thought the sensor was broken.

There is a tread in the SAUNSW members sponsors area.

http://www.skylinesaustralia.com/forums/topic/314551-great-deals-on-radiators/

That link didn't work ?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • I thought I'd do a write up on an auto transmission fluid change for a the nissan 7 speed Automatic. At some stage the genius engineers decided that the fluid in the trans was "for the life of the transmission", (which seems kind of self supporting to me) and removed the dip stick and fill tube (funnily enough there is still a casting for it). Anyway, for this job you do need 2 specialist tools in addition to regular hand tools, jack and good chassis stands. You need a way to pump fluid up to the transmission; I got one of these but there are plenty of other options: https://www.ebay.com.au/itm/364584087070 Don't trust the generic listing though, it does not come with the required adapter for the Nissan 7 Speed. You need one of these, can't do the job without it: https://navarapart.com.au/product/genuine-nissan-patrol-y62-d23-np300-navara-re7-dipstick-fill-connector1 You need a heap of compatible transmission oil. Could be Nissan, could be anything else rated for Nissan Matic S. You need at least 10 litres, I had 15 to give it a better flush... Also, you need some biiig oil catch trays, at least one of these, or bigger if possible (volume was fine, size was very marginal): https://autobarn.com.au/ab/Autobarn-Category/Tools-%26-Garage/Specialty-Tools/Oil-Service/Garage-Tough-Oil-Drain-Pan-Black-16L---GT1068/p/TO03191 Finally, a measuring jug is very useful if your pump does not have volumes marked on it, I got a 6l one: https://www.repco.com.au/oils-fluids/fluid-accessories/measuring-jugs/penrite-measuring-jug-6l-pmj006/p/A5322648 Oh, and gloves.....this stuff is horrible (not as bad as diff oil, but getting there) ....First, jack up your car.....
    • So I mentioned the apprentice, @LachyK helped take the bonnet off. We just undid the nuts on the hinges and unclipped the gas struts, then pulled the bonnet back a little as the front was catching on the front bar.  I had a good look at everything today and have removed the rams, repaired/reset the hinges and bolted it back together like it never happened. I'll do a separate write up on the repair, and I also removed the poppers from the Fuga today too to save grief down the road.....as said above it is at least $5k to repair retail. I'm also happier about my ability to prepare a race car, and less happy about Nis-nault's engineering (I can hear @GTSBoy sAfrican Americaning) because the top hose of the radiator didn't slip off.......it snapped clean off. By practice I put the hose clamp hard up against the flare on a neck to make it least likely to ever move (thanks @Neil!). I guess that puts a little more pressure on the end of the pipe as it is further away from the rad, but still, that is pretty shit. I've put it back on for now as there was a fair bit of neck still there, but obviously there is no lip on the neck any more so I don't think I'll track it again until I have a new rad. Speaking of which....more research required. It looks like Koyo makes a standard size radiator in ally which I'll grab in the meantime, but I really want something thicker so might have to go custom in the medium term (ouch) Coolant still needs a refill and I have the pressure tester on it over night, but other than a wash down of the engine bay it seems alright. And @MBS206 noted something noisy on the front of the engine and I think I agree....time for a new accessory belt and tensioners I think.
    • our good friends at nismo make a diff for it, I have one (and a spare housing to put the centre in) on the way. https://www.nismo.co.jp/products/web_catalogue/lsd/mechanical_lsd_v37.html AMS also make a helical one, but I prefer mechanical for track use in 2wd (I do run a quaife in the front, but not rear of the R32)
    • What are we supposed to be seeing in the photo of the steering angle sensor? The outer housing doesn't turn, right? All the action is on the inside. The real test here is whether or not your car has had the steering put back together by a butcher. When the steering is centred (and we're not caring about the wheel too much here, we're talking about the front wheels, parallel, facing front) then you should have an absolutely even number of turns from centre to left lock and centre to right lock. If there is any difference at all then perhaps the thing has been put back together wrongly, either the steering wheel put on one spline (or more!) off, and the alignment bodged to straighteb the wheel, or the opposite where something silly was done underneath and the wheel put back on crooked to compensate. Nut there isn't actually much evidence that you have such a problem anyway. It is something you can easily measure and test for to find out though. My money is still on the HICAS CU not driving the PS solenoid with the proper PWM signal required to lighten the load at lower speed. If it were me, I would be putting either a multimeter or oscilloscope onto the solenoid terminals and taking it for a drive, looking for the voltage to change. The PWM signal is 0v, 12V, 0V, 12v with ...obviously...modulated pulse width. You should see that as an average voltage somewhere between 0V and 12V, and it should vary with speed. An handheld oscilloscope would be the better tool for this, because they are definitely good enough but there's no telling if any cheap shit multimeter that people have lying around are good enough. You can also directly interfere with the solenoid. If you wire up a little voltage divider with variable resistor on it, and hook the PS solenoid direct to 12V through that, you can manually adjust the voltage to the solenoid and you should be able to make it go ligheter and heavier. If you cannot, then the problem is either the solenoid itself dead, or your description of the steering being "tight" (which I have just been assuming you mean "heavy") could be that you have a mechanical problem in the steering and there is heaps of resistance to movement.
    • Little update  I have shimmed the solenoid on the rack today following Keep it Reets video on YouTube. However my steering is still tight. I have this showing on Nisscan, my steering angle sensor was the closest to 0 degrees (I could get it to 0 degrees by small little tweaks, but the angle was way off centre? I can't figure this out for the life of me. I get no faults through Nisscan. 
×
×
  • Create New...