Hi guys,

Coming to the forums to see if i can get some help. Currently swapping a rebuilt S5 motor into my project turbo 2. It currently has a jdm block in it, but im dropping a usdm rebuild. The problem I have is that there seems to be a coolant line missing. I believe i have USDM intake manifolds, but the lines were modded to work with jdm block. Anyone know how to reroute the hoses, or do i have to replace a hard line?

 

you are going to have to post pics or something, there is a lot of information missing in your post. You have to remember that there are significant differences among S4 USDM, S4 JDM, S5 USDM, and S5 JDM manifolds. These are mostly due to changes in emissions equipment and differences due to LHD vs RHD.

 

ok, pics up tomorrow. Everything is S5 turbo.

 

anyone with pics or diagrams of stock intake manifolds and coolant lines???

 

Is it S5 JDM or S5 USDM? There are differences.

 

I'll jump the gun and just say that coolant hose routing is the same on US and Japanese engines. If there's a missing hose on one engine, someone removed something. The coolant lines running through the BAC or to/from the thermowax are commonly bypassed or rerouted.

 

Here are pics,

The port is an open two bolt flange. It routes to the engine block. Jdm port was not open, us block is. The port is directly above the exhaust port on the rear housing. pics for reference

 

I was also looking on mazda trix for parts. They sell a water bypass plug, i guess i could go that route, if i cant figure out the lines.

 

Mystery solved, after about an hour of no help at the dealer...the internet comes through again.

coolant feed for turbo. I guess the jdm turbo line runs towards the front of the engine block. The usdm runs to the rear.

Maybe i'll just slap on the bnr stage 2 since it has all the correct lines on already.

 

the first picture.
That is the coolant feed line for the stock turbo.

edit : woops, seems like you figured it out already lol

 

ya, got it...thanks tho.

 

Looks like Your engine in the pics in the post #7 has FD3S or later rotor housings...

That would explain why they were getting a coolant source elsewhere

 

Semi-related curiousity

S5 LIM only has port openings to match the rear port on S5 rotor housings, the front port on the S5 LIM is blocked. So while both S5 rotor housings will have coolant ports, only one of them is used. Does all that sound correct?

And I know, the engine in this thread have FD housings so both ports are blocked.

 

ah, got it. I actually bought the jdm motor from you. the coolant seals were shot.

 

the coolant line off the turbo is either different or is flipped and is running the opposite direction to get coolant from a source off the front of the engine. if it still has the flange on the line then take the 24mm bolt off and flip the line the other direction and it should fit right onto that open coolant passage.

 

When was this?

 

it was a few years ago. unfortunately after dropping in the motor, it smoked and eventually found coolant in the oil pan. cars been in storage for a while...just getting back to working on it.

Karack, Luckily i have the right lines on the BNR stage 2 in my parts bin.