BEGI Turbo Coolant Re-route Kit

Postby **mx52nv** » Sat Jul 11, 2009 5:53 pm

Hi guys,
I am not sure if this has been posted yet. I am building my BP engine :twisted:

and so was trial fitting this on the engine stand. Decided to look around for a helpful thread and found this:

Click here for BEGI Turbo Coolant Re-route Kit Review

It is a very good and comprehensive thread with images and valid points of discussion for anyone planning to purchase and install the above kit.
Hope someone will find it useful (as I did). Oh and please read it to the end as the original install by the OP had a mistake which is corrected later in the thread.

Les

fastfreddygassit · Postby **fastfreddygassit** » Sat Jul 11, 2009 6:59 pm

Very, very good write-up. Mind you, all the talk about yabbies (or CRAWfish :roll:

) had my mouth watering so I had to shoot down to KFC half way through reading it. :mrgreen:

Novice1 · Postby **Novice1** » Sat Jul 11, 2009 7:00 pm

Had Turbo coolant re-route kit fitted by Mx5plus,Qld.

Nice bit of gear. Temperature readings significantly lower.
Cheers Novice1

Steampunk · Postby **Steampunk** » Tue Jul 14, 2009 12:13 am

I have the little brother version of this and it works great..... sometimes a little too great

mr_rotary · Postby **mr_rotary** » Tue Jul 14, 2009 6:52 pm

How do you get to your oil filter :shock:

I guess you would have to get at it from underneath!

Postby **mx52nv** » Tue Jul 14, 2009 7:23 pm

mr_rotary wrote:How do you get to your oil filter
I guess you would have to get at it from underneath!

mr rotary,
Valid point for the D.I.Y. MX5 owners out there without a hoist.
Luckily, I will be running an oil cooler with an oil filter relocation kit.

Les
P.S. when do we get to see you at a local meet (i.e. 3pm this Saturday 18 July at Next Cafe?)

Adam_NAclubman · Postby **Adam_NAclubman** » Wed Jul 15, 2009 11:48 pm

Is this just to get the coolant hose away from excess heat?

Alex · Postby **Alex** » Thu Jul 16, 2009 7:48 am

Adam_NAclubman wrote:Is this just to get the coolant hose away from excess heat?

I believe it has something to do with the way mazda routed the coolant through the engine, nothing to do with keeping hoses away from excess heat.

Benny · Postby **Benny** » Thu Jul 16, 2009 4:57 pm

Doesn't this kit reverse the flow of coolant around the engine?
Instead of the coolant going from the front of the engine to the rear of the engine, it goes in the rear and comes out the front.
It has something to do with the fact that the rear of the heads and engine are usually hotter than the front, so by reversing the flow, the cooler coolant goes to the hottest part of the engine first etc.

A number of the turbocharged race cars use this reversed system and they say it helps out a lot on the track.

Juffa · Postby **Juffa** » Fri Jul 17, 2009 1:40 pm

The early MX-5 engines were originally designed for use in East-West config... i.e. Front wheel drive. When it was placed in a North-South config...i.e. rear wheel drive the coolant flow was changed by the engineers. Probably not an issue for most people, but if you are trying to get the most out of your engine by either forced induction or other methods the coolant flow can cause issues. I believe the issue is mainly coolant flow around the number 4 cylinder, meaning that it runs hotter. There can also be an issue with fuel flow via the normal fuel rail...and the two combined can cause big issues for high powered MX-5s

There have been various ways of re-routing tried by individuals and companies such as BEGI and FM.... The BEGI is getting good reviews. I would suggest anyone who is interested to know more search the big forum and/or miataturbo.net

J

Mokesta · Postby **Mokesta** » Fri Jul 17, 2009 6:22 pm

^^ What he said. The MX-5 coolant flow is in at the bottom front and out at the top front with a smaller proportion going out at the top rear then through the heater and back to the pump. The rear of the engine doesn't get as much water flow as the front. Alledgedly. There is some discussion that the head gaskets are different between front and rear drive PB motors to counteract the issue with the rear drivers.

With a coolant re-route the coolant goes in at the bottom front (no change) and comes out at the top rear. There are two outlets at the rear, one to a pipe that comes back to the front for the radiator and another for the heater.

MX-5 Plus have a beautifully machined re-route spacer for the rear of the head. It goes between the head and a Mazda thermostat outlet (like off a front drive PB motor). The spacer is machined to have a heater off take nipple, thermostat seating groove and two temperature sensor tappings. One for the OEM sensor and another for any after-market computer, idiot light, engine monitor etc. Given a difference in sensors between 1600 and 1800 engines, there are two versions of the spacer.

All that is needed for the conversion is a thermostat cover with no tappings (too tall with) like one of a front drive PB motor (I got one from the wreckers for $10), and maybe a bung if you're not using the additional sensor port. Then you'll need a pipe or hose to connect back to your top radiator connection.

I plan to use the spacer and route the hose/pipe down the cold side to the radiator, along the chassis rail. I expect the pipe will be part of a larger "kit" for doing this mod in the future. This may be why the spacers are not widely advertised.

M

Postby **orx626** » Fri Jul 17, 2009 10:24 pm

Mokesta wrote:PB motor

I didn't know Parsons Brinckerhoff made engines?! :lol:

Someone's got work on their brain!!!

Cheers,
Danny

Mokesta · Postby **Mokesta** » Fri Jul 17, 2009 11:36 pm

sexDali

Dislexia :oops:

ampz · Postby **ampz** » Wed Jul 22, 2009 1:02 pm

Mokesta wrote:MX-5 Plus have a beautifully machined re-route spacer for the rear of the head.
M

Pics of spacer please?
I'll send them an email about sending one down to Sydney. I don't really need warranty, etc just the part...

The reason for coolant reroutes (especially the way the OP has posted) is to remove the mixing manifold at the front of the engine.
This mixing manifold causes an inbalance in coolant flow in the engine, and hotspots form at the rear outlet. Think about it, there is one inlet at the bottom of the water pump (below the p/s pump above the a/c compressor) that is fed with cooled coolant from the radiator. It then has 2 possibilities to exit the engine, from the front of the engine and from the back of the head. Not only that, the hot coolant coming from the back of the engine, then mixes in with the cold coolant heading in to the engine again (this is necessary even with the reroute otherwise it will take an eternity to warm up and to pressurise the system).
Ok the thermostat is located on the return path to the radiator at the front of the engine, slightly preventing the cold coolant (as it is a restrictor) from just flowing straight to the top of the radiator.

So a spacer on the back of the engine to allow a thermostat in it and the front outlet blocked off would allow a front to rear coolant flow which would reduce the possibility of hotspots.

Disclaimer: This is only my opinion and understanding of flow principles from working (and breaking) cars. I take no responsibility for anyone breaking their bits. I only have overheating issues after extended hard driving (ie: 30 minute track sessions, 2-3 hour spirited runs) with a standard radiator .