Koyo Installation Tips - RX7Club.com - Mazda RX7 Forum

3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.

Koyo Installation Tips

Reply

 
 
 
Old 11-04-16, 12:44 PM
  #1  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
Koyo Installation Tips

For years I have seen threads about Koyo install issues. We have been installing them for 15+ years without any issues, so I figured we would snap a few pics of the most recent installation and the things we do to make for a pain free installation.

For the point of this thread we are going to assume the installer has the capabilities required to removed and install a stock radiator.

Lay both radiators next to each other.



Install the fans, rubber grommets and brackets from the original radiator on the Koyo, everything mounts exactly the same way. DO NOT MOUNT THE BRACKETS UPSIDE DOWN, this is bad information that has been handed out on this forum for over a decade. Inspect the fan motors, to insure they spin freely and that the blade assemblies are not broken. Do not try to glue them back together.







Next that car needs to be prepared for the installation. This is the bracket that causes the largest problem, it is the right side upper A/C condenser bracket. If you have removed your A/C then skip ahead.



This bracket needs to be flipped over or removed. Once it is flipped over it allows the radiator to drop right in.







Next both the radiator bottom supports need to be bent slightly to accommodate the thicker radiator.








Banzai-Racing is offline  
Reply With Quote
Old 11-04-16, 12:45 PM
  #2  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
The brackets also need to be inspected for damage, we have seen countless bent brackets. As you can see this will raise the radiator, causing fitment issues. The good news is they are inexpensive from Mazda.









Banzai-Racing is offline  
Reply With Quote
Old 11-04-16, 12:49 PM
  #3  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
Now the new Koyo will drop in.






Remember to bend the low tabs back up.



This is a great time to install new hoses and an upgraded AST. Now just put the car back together and fill with coolant. Remember to burp the system properly.

Last edited by Banzai-Racing; 11-04-16 at 01:06 PM.
Banzai-Racing is offline  
Reply With Quote
Old 11-04-16, 01:04 PM
  #4  
불*면*증*
iTrader: (10)
 
Brody8877's Avatar
 
Join Date: Sep 2005
Location: San Francisco
Posts: 1,781
Thanked 5 Times in 5 Posts
This should be sticky
Brody8877 is offline  
Reply With Quote
Old 11-04-16, 01:44 PM
  #5  
Rare for a Reason
iTrader: (13)
 
Narfle's Avatar
 
Join Date: Nov 2002
Location: Dagobah
Posts: 5,307
Thanked 56 Times in 45 Posts
Awesome post, thank you! The pictures of the ac bracket help make it very clear.
Narfle is online now  
Reply With Quote
Old 11-04-16, 02:03 PM
  #6  
OEM
iTrader: (1)
 
Zepticon's Avatar
 
Join Date: Jul 2012
Location: Norway
Posts: 514
Thanked 56 Times in 40 Posts
Awesome! But i am pretty sure i didnt need to turn the bracket around on mine But this guide should be sticky!
Zepticon is offline  
Reply With Quote
Old 11-04-16, 02:06 PM
  #7  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
^ only way it would go in without altering/removing the bracket is to damage the side of the radiator, which is something I prefer not to do when it only takes 5 minutes extra to install correctly.
Banzai-Racing is offline  
Reply With Quote
Old 11-04-16, 02:07 PM
  #8  
Sponsor
RX7Club Vendor
iTrader: (41)
 
IRPerformance's Avatar
 
Join Date: Apr 2003
Location: NJ
Posts: 10,906
Thanked 32 Times in 29 Posts
Good info. I'll add that I usually get rid of the stock rubber lord mounts. This will allow the radiator to drop down even further and helps fitment if you have a stock intake and intercooler.
__________________
http://irperformance.com
Engine builds, single turbo kits, parts sales, performance upgrades, maintenance, tuning
732-662-1794 [email protected]
Brand new Mazda oem 13brew motors available. $4599 NO CORE FEE. VERY LIMITED. Check out our new turbo kits http://www.irperformance.com/product...zda/rx7/turbo/
IRPerformance is offline  
Reply With Quote
Old 11-04-16, 02:11 PM
  #9  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
^ I never remove them and have not had any problems with installation of stock or aftermarket SMICs. The rubber mounts prevent premature wear.

Last edited by Banzai-Racing; 11-04-16 at 02:13 PM.
Banzai-Racing is offline  
Reply With Quote
Old 11-04-16, 02:24 PM
  #10  
Put it in the microwave!
iTrader: (20)
 
kensin's Avatar
 
Join Date: Jul 2009
Location: CA
Posts: 1,384
Thanked 18 Times in 17 Posts
write up on fluidyne please !! this is good thread
kensin is offline  
Reply With Quote
Old 11-04-16, 02:39 PM
  #11  
Penis Healthy
iTrader: (5)
 
FührerTüner's Avatar
 
Join Date: Jul 2013
Location: █▬█ █▄█ █▬█ █▄██▬█ █▄█ █▬█ █▄█
Posts: 1,973
Thanked 41 Times in 37 Posts
Thanks!
FührerTüner is offline  
Reply With Quote
Old 11-04-16, 06:56 PM
  #12  
Full Member
iTrader: (1)
 
jsemerica's Avatar
 
Join Date: Sep 2013
Location: Phoenix
Posts: 155
Thanked 4 Times in 4 Posts
Thanks for doing this I might take a look at my fluidyne and see if I need to adjust anything futher. It's hard mounted without the rubber isolator bushings and the upper radiator hose still seems to push up on the stock intake.
jsemerica is offline  
Reply With Quote
Old 11-04-16, 07:43 PM
  #13  
불*면*증*
iTrader: (10)
 
Brody8877's Avatar
 
Join Date: Sep 2005
Location: San Francisco
Posts: 1,781
Thanked 5 Times in 5 Posts
Originally Posted by kensin View Post
write up on fluidyne please !! this is good thread
Fluidyne is straight drop in, no need to remove OEM radiator bracket or bend anything.
Brody8877 is offline  
Reply With Quote
Old 11-04-16, 07:48 PM
  #14  
Rotary Specialists
RX7Club Vendor
Thread Starter
iTrader: (11)
 
Banzai-Racing's Avatar
 
Join Date: Jan 2008
Location: Indiana
Posts: 4,497
Thanked 56 Times in 45 Posts
Fluidyne runs a minimum of 10F hotter, with an FMIC we see 20F

Remove them all the time
Banzai-Racing is offline  
Reply With Quote
Old 11-05-16, 03:23 AM
  #15  
Senior Member
iTrader: (1)
 
Moe Greene's Avatar
 
Join Date: Aug 2016
Location: Colorado
Posts: 375
Thanked 10 Times in 10 Posts
How does the Koyo compare to the Mishimoto radiator in terms of fitment and cooling.
Moe Greene is offline  
Reply With Quote
Old 11-10-16, 04:18 PM
  #16  
Sponsor
RX7Club Vendor
iTrader: (41)
 
IRPerformance's Avatar
 
Join Date: Apr 2003
Location: NJ
Posts: 10,906
Thanked 32 Times in 29 Posts
The Koyo radiator is nearly twice as thick as the Mishimito. Mishimoto is easier to fit but often the mounting holes for the fans are often off and need to be drilled out. The bypass hose nipple is also the wrong size requiring an reducer. Mishimoto isn't known for quality. There is always some issue, though usually minor, that needs to be corrected.
__________________
http://irperformance.com
Engine builds, single turbo kits, parts sales, performance upgrades, maintenance, tuning
732-662-1794 [email protected]
Brand new Mazda oem 13brew motors available. $4599 NO CORE FEE. VERY LIMITED. Check out our new turbo kits http://www.irperformance.com/product...zda/rx7/turbo/

Last edited by IRPerformance; 11-10-16 at 05:16 PM.
IRPerformance is offline  
Reply With Quote
Old 11-12-16, 06:00 PM
  #17  
Senior Member
iTrader: (5)
 
FD3S_wanted's Avatar
 
Join Date: Jul 2002
Location: Québec
Posts: 702
Thanks: 0
Thanked 2 Times in 2 Posts
Great info. Thanks.

I can't see from the pics if you have cut or bend the little tab (see picture) on the bracket? On my car I can't get the right angle with it.
Attached Thumbnails Koyo Installation Tips-radiator0003_2ccb83f63c5e9dd6e89e99e559d4e09778f4a27d.jpg  
FD3S_wanted is offline  
Reply With Quote
Old 11-13-16, 01:39 AM
  #18  
needs more track time
iTrader: (14)
 
gracer7-rx7's Avatar
 
Join Date: Mar 2006
Location: Bay Area CA
Posts: 7,799
Thanked 9 Times in 8 Posts
Just added to the FAQ. Thanks Banzai.

+1 on Mishimoto sucking
gracer7-rx7 is offline  
Reply With Quote
Old 11-14-16, 08:25 PM
  #19  
Full Member
 
Join Date: Apr 2016
Location: Panama
Posts: 75
Thanked 0 Times in 0 Posts
Nice! Installed a Koyo Nflow 2 months ago in my 02 FD3S with no issues and perfect fitment!
jonahau is offline  
Reply With Quote
Old 11-18-16, 08:14 AM
  #20  
OEM
iTrader: (1)
 
Zepticon's Avatar
 
Join Date: Jul 2012
Location: Norway
Posts: 514
Thanked 56 Times in 40 Posts
One thing that i dont think you mentioned, is that the OEM radiator has foam on the sides, to stop air flowing around the radiator. I bought some soft but dense foam to make sure as much air as possible go where it should.

This is if you dont have any intake mods who pull air from this location.

Name:  IMG_6100.jpg
Views: 477
Size:  267.3 KB
Name:  IMG_6103.jpg
Views: 478
Size:  273.3 KB
Zepticon is offline  
Reply With Quote
Old 11-23-16, 02:34 PM
  #21  
Rotary Enthusiast
iTrader: (36)
 
rotary#10's Avatar
 
Join Date: Aug 2005
Location: Oakland, CALI = O
Posts: 853
Thanked 3 Times in 3 Posts
Great info. Now I have to go back and redo my radiator a 3rd time. Lol.
rotary#10 is offline  
Reply With Quote
Old 11-23-16, 05:19 PM
  #22  
Full Member
iTrader: (7)
 
Join Date: Oct 2008
Location: Canada
Posts: 119
Thanked 0 Times in 0 Posts
I had some rubbing issues with Koyo radiator and my Greddy FMIC piping. The Greddy brackets are meant for the stock rad which is smaller. To address this i could have a made some new brackets to accommodate the bigger Koyo rad and try to drop it lower down. Instead I took the intercooler pipe it was rubbing against to the vise and a big hammer and made a few nonchalant dents in the right spots. The goal is to not crack or perforate the pipe, so take your time.
GL!
7-XR is offline  
Reply With Quote
Old 11-26-16, 07:26 AM
  #23  
Moderator
iTrader: (7)
 
dgeesaman's Avatar
 
Join Date: May 2002
Location: Fort Kickass
Posts: 12,298
Thanks: 0
Thanked 2 Times in 2 Posts
Outstanding, thanks. I have a Koyo sitting here ready to replace a leaking Fluidyne (not the Fluidyne's fault) and aside from being busy I've been noodling over how to make it fit with my stock airbox/Blitz SMIC/AC condenser. This thread confirms it's good to be a procrastinator sometimes.

I think between these tips and the possibility of adding spacers to the AC condenser, I should have things in order. For those that have lowered their assembly, did you have issues with the stock undertray pressing on things?
dgeesaman is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.