Miatapower List Archive

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Mail From: "Shaun Bogan" <(email redacted)>

I'd just like to brag about my successful coolant reroute. After a few
weeks of on and off fabrication, I came up with a nice aluminum pipe setup
that has made an incredible difference in my coolant temperatures. I used
to see about 108C on tight, slower race tracks; now it's down to 85C. I
ended up bypassing the old heater core loop and feeding the heater core via
the coolant boss that is normally used for the stock oil "cooler" and
throttle body heater. Now all the hot coolant goes directly to the radiator,
the car still makes good heat, and the operating temperatures are at
thermostat temp during cruise and only a few degrees higher during heavy
boost. Now it's time to install the new chip in the ECU and re-tune for
cool running engine and my nicely balanced cylinder temps.



Woohoo!!



Shaun

This read-only message was archived from a public mail list.
Mail From: Tony Cooper <(email redacted)>

Shaun,

Got any more details and pictures perhaps? Thermostat at the back of
the head?

Tony

Shaun Bogan wrote:
>
> I'd just like to brag about my successful coolant reroute. After a
> few weeks of on and off fabrication, I came up with a nice aluminum
> pipe setup that has made an incredible difference in my coolant
> temperatures. I used to see about 108C on tight, slower race tracks;
> now it's down to 85C. I ended up bypassing the old heater core loop
> and feeding the heater core via the coolant boss that is normally used
> for the stock oil "cooler" and throttle body heater. Now all the hot
> coolant goes directly to the radiator, the car still makes good heat,
> and the operating temperatures are at thermostat temp during cruise
> and only a few degrees higher during heavy boost. Now it's time to
> install the new chip in the ECU and re-tune for cool running engine
> and my nicely balanced cylinder temps.
>
>
>
> Woohoo!!
>
>
>
> Shaun
>
>
>
>
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Miatapower mailing list
> (email redacted)
> list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
>

This read-only message was archived from a public mail list.
Mail From: (email redacted)

Pics! Pics! Pics?
=20
Jim in Tucson
=20
=20
=20
In a message dated 8/18/2008 11:18:00 A.M. US Mountain Standard Time, =20
(email redacted) writes:

=20
I=E2=80=99d just like to brag about my successful coolant reroute. After a=
few=20
weeks of on and off fabrication, I came up with a nice aluminum pipe setup=20=
that=20
has made an incredible difference in my coolant temperatures. I used to se=
e=20
about 108C on tight, slower race tracks; now it=E2=80=99s down to 85C. I e=
nded up=20
bypassing the old heater core loop and feeding the heater core via the cool=
ant=20
boss that is normally used for the stock oil =E2=80=9Ccooler=E2=80=9D and t=
hrottle body=20
heater. Now all the hot coolant goes directly to the radiator, the car stil=
l makes=20
good heat, and the operating temperatures are at thermostat temp during=20
cruise and only a few degrees higher during heavy boost. Now it=E2=80=99s=20=
time to=20
install the new chip in the ECU and re-tune for cool running engine and my=20=
nicely=20
balanced cylinder temps. =20
Woohoo!!=20
Shaun=20



_______________________________________________
Miatapower mailing list
(email redacted)
list.miatapower.net/cgi-bin/mailman/listinfo/miatapower





**************Looking for a car that's sporty, fun and fits in your budget?=20
Read reviews on AOL Autos. =20
(autos.aol.com/cars-Volkswagen-Jetta-2009/expert-review?ncid=3Daolaut=
00030000000007 )

This read-only message was archived from a public mail list.
Mail From: "Shaun Bogan" <(email redacted)>

I hear ya. First, I trashed the AC and converted my power steering rack
over to manual steering by disassembling the steering rack per Flyin Miata's
web site. Manual steering on a Miata is the only way to go IMO, but keep in
mind that I pretty much just beat on my car at race tracks and drive it when
the weather is nice. So, as a result, I have more room than I did
previously. That being said, it's still more than possible to perform a
re-route on a loaded car, but it'll require a bit more patience. Working
behind the head isn't that bad when you get used to it. You just need to
pull the coils, disconnect your CAS and o2 sensors, and then pull everything
to the side. The biggest PITA was removing the old gasket from the rear of
the head when I installed the new stat housing. The old gasket was really
on there. I just soaked it with gasket remover for a good 45 min and slowly
chipped away at it. You will become very intimate with your fenders and
intake manifold during this process. ;-)



1, The 1.6L stat is a factory mazda part and is very inexpensive. Less than
20 dollars.



2, Heat from the turbo should be shielded using some sort of stainless steel
or aluminum heat shield. As long as it's shielded and you have thermal wrap
protecting your heater lines and brake lines, you should be GTG. Under hood
temps will be high without a NACA duct or heat extractor hood, but that
really only effects intake temps, not so much coolant / head temps.



3, I have also fabricated an extensive under tray that forces air through my
IC and radiator. I've also sealed the radiator from the upper core support
to the top of the radiator. In addition, I have a Racing Beat type II nose
fitted.



4, The coolant boss is located and the lower leftmost corner of the cylinder
head when looking at the engine from the front. I removed the factory oil
heater/cooler and throttle body heater circuit to free this up, but you
could just as easily Tee into it of you wanted to keep it intact. One thing
to note, the boss accepts a 3/8th hose and the heater core inlet is 5/8ths.
So, you'll need to construct an adapter using a home depot brass coupler,1
3/8th hose barb, and 1 5/8th hose barb. A side benefit of this arrangement
is that you will no longer roast your feet when driving hard because there
is less coolant flow through the heater core and the coolant that does flow
through it isn't super heated.



5, I plumbed the heater return directly into the new pipe that runs back to
the radiator. To do this you need to remove the existing pipe that connects
to the cold water inlet on the block, remove the cast aluminum manifold
(it's just 2 bolts) and take it to someone that can TIG weld it closed.
That step is required to close of the old hot coolant return that usually
mixes with the cold coolant from the radiator. This def hurts cooling
efficiency as the coolant that comes out of the heater core is super hot
with the factory routing and just heats up the cool coolant that is coming
from the radiator.



Some guys have done different variations of this re-route, most of them are
less work. However, I wanted something that was engineered, efficient, and
didn't look hacked up. It was a def a PITA all said and done, but totally
worth it to have a Miata that runs cool at 12 PSI WOT all day.



I'll be sure to post some pictures soon.



Shaun

_____

From: Tony Cooper [mailto:(email redacted)]
Sent: Monday, August 18, 2008 4:29 PM
To: Shaun Bogan
Subject: Re: coolant reroute success!



The overheating has taken all the fun out of driving my Miata. Temps keep
creeping up and up till I turn off AC. Then they start dropping just as
fast. How hard to put the Tstat in the back. Looks like a royal pain.
Guess you need to buy a mazda part if you relocate the tstat back there.

Does the heat generated from the turbo cause you any concern?

Where is the coolant boss you mentioned for the heater input? And where do
you route the heater return back?

Questions questions...

Thanks Tony

Shaun Bogan wrote:

Yeah, if your interested, I'll snap a photo or two.



Essentially, it's the typical 1.6L stat housing on the back of the head
toward the exhaust side running into a fabricated aluminum pipe/manifold
that is used to transport heater core return and turbo coolant return
directly into the radiator. This bypasses the hot/cool mixing action that
usually takes place with the stock route. It looks just like this :
flyinmiata.com/projects/OTC/images/OTC_motor_preinstall.jpg



Except I have fittings for the heater return and turbo coolant lines on
mine. I also ran the aluminum pipe a bit farther up toward the radiator. I
can't tell you how nice it was to be able to endlessly beat on the car
without having to worry about the temp. Serious fun. :-)



Shaun



_____

From: Tony Cooper [mailto:(email redacted)]
Sent: Monday, August 18, 2008 2:30 PM
To: Shaun Bogan
Cc: 'Miata Power List'
Subject: Re: coolant reroute success!



Shaun,

Got any more details and pictures perhaps? Thermostat at the back of the
head?

Tony

Shaun Bogan wrote:

I'd just like to brag about my successful coolant reroute. After a few
weeks of on and off fabrication, I came up with a nice aluminum pipe setup
that has made an incredible difference in my coolant temperatures. I used
to see about 108C on tight, slower race tracks; now it's down to 85C. I
ended up bypassing the old heater core loop and feeding the heater core via
the coolant boss that is normally used for the stock oil "cooler" and
throttle body heater. Now all the hot coolant goes directly to the radiator,
the car still makes good heat, and the operating temperatures are at
thermostat temp during cruise and only a few degrees higher during heavy
boost. Now it's time to install the new chip in the ECU and re-tune for
cool running engine and my nicely balanced cylinder temps.



Woohoo!!



Shaun















_____






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This read-only message was archived from a public mail list.
Mail From: "Robert McElwee" <(email redacted)>

I did a "poor man's reroute" on my Miata using a tee to tie the water from
the back of the head into the upper radiator hose and blocking off the
mixing manifold. I didn't change the location of the stock thermostat. Below
you will find a diagram of the reroute and a not very good picture of where
the tee is located:

lightweightmiata.com/phenolic/phenolic07.jpg

lightweightmiata.com/beastforsale/17.jpg


On Mon, Aug 18, 2008 at 2:30 PM, Tony Cooper <(email redacted)>wrote:

> Shaun,
>
> Got any more details and pictures perhaps? Thermostat at the back of the
> head?
>
> Tony
>

--
Robert McElwee and Blue Flash
"The 50 MPG Miata"
www.lightweightmiata.com/mpg

Lightweight Miata Forum:
www.lightweightmiata.com/forum

The Miata Trailer Project:
www.lightweightmiata.com/trailer