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Old 08-13-2010, 04:56 PM
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The Mazdaspeed Motorsports RAD is A beast.....and it isn't exactly plug and play...but it isn't too bad

Especially if you dump the air conditioning condenser You can use higher output fans and have a lot more cooling capacity
Old 08-13-2010, 05:13 PM
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Bingo ....
Old 08-13-2010, 05:18 PM
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Do you guy know what the Mazdaspeed unit runs once I get everything I need (timeslips) to get the Mazdaspeed discount?
Old 08-13-2010, 06:13 PM
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Originally Posted by MrVei
on a day i was wot on my fav mt road going up in 2/3 my temps topped at 195f, it was 96f out side. my mods are no bumper beam, romoved grill, under drive crank pulley, 160 threm, fans on full power at 181. on the freeway i sit at 164f
You shouldn't operate your engine under load below 185°F.

Originally Posted by TeamRX8
I'm sure professional RX-8 racers have their reasons for using the option I suggested.
You mean like all the Grand Am teams that use the Ron Davis and Griffin (who build the BHR rad)?
Old 08-13-2010, 06:19 PM
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Originally Posted by dannobre
The Mazdaspeed Motorsports RAD is A beast.....and it isn't exactly plug and play...but it isn't too bad

Especially if you dump the air conditioning condenser You can use higher output fans and have a lot more cooling capacity
Dump the A/C condenser? You mean take it out?

Well guess what,, that will increase flow across the radiator. Any radiator. It will even help the stock radiator cooling efficiency.
But for us people that live below the 45th parallel. We like A/C.
That would not be an option for most people if you have to do that to use the Mazdaspeed radiator.
Old 08-13-2010, 06:23 PM
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Originally Posted by MazdaManiac



You mean like all the Grand Am teams that use the Ron Davis and Griffin (who build the BHR rad)?

The Ron Davis Rad that Mazmart sells..and the Griffin Rad that BHR sell....are not even close to the rad Ron Davis makes for the race teams....
C&R also make a monster rad for the race teams as well....

The comparison between the Regular Ron Davis Rad and the Motorsports Rad is like comparing a minibike to a GSXR100 Race bikes horespower output
Old 08-13-2010, 06:29 PM
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Originally Posted by dannobre
The Ron Davis Rad that Mazmart sells..and the Griffin Rad that BHR sell....are not even close to the rad Ron Davis makes for the race teams....
C&R also make a monster rad for the race teams as well....

The comparison between the Regular Ron Davis Rad and the Motorsports Rad is like comparing a minibike to a GSXR100 Race bikes horespower output
How many Grand Am teams have you tuned so far?
Old 08-13-2010, 06:30 PM
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Originally Posted by Easy_E1
Dump the A/C condenser? You mean take it out?

Well guess what,, that will increase flow across the radiator. Any radiator. It will even help the stock radiator cooling efficiency.
But for us people that live below the 45th parallel. We like A/C.
That would not be an option for most people if you have to do that to use the Mazdaspeed radiator.

You don't have to remove it...but it doesn't come with the brackets or the bosses to hold it on to the rad....that's where the fabrication comes in...same with the fan brackets...they need to be custom fabricated as well....wasn't too bad a job...took about an hour with a TIG welder

I am actually thinking about doing a v-mount of sorts for the condenser and see if that works
Old 08-13-2010, 06:33 PM
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Originally Posted by MazdaManiac
How many Grand Am teams have you tuned so far?


And this is relevant why

Come on Jeff.......you have to do better than that

How many Motorsports rads have you installed?

Also...it's a moot point in some series...cause they often can't swap out stock parts

Wanna see some pictures from a couple of teams radiator setups I have friends too
Old 08-13-2010, 06:36 PM
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Originally Posted by dannobre
You don't have to remove it...but it doesn't come with the brackets or the bosses to hold it on to the rad....that's where the fabrication comes in...same with the fan brackets...they need to be custom fabricated as well....wasn't too bad a job...took about an hour with a TIG welder

I am actually thinking about doing a v-mount of sorts for the condenser and see if that works
So it's a race radiator. OK
Old 08-13-2010, 06:43 PM
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Originally Posted by Easy_E1
So it's a race radiator. OK


....yes...what did you think we were talking about

Usually Mazdaspeed Motorsports custom parts are race use parts.....

I wasn't trying to bash your BHR Rad...it's an awesome rad for stock application..and likely the best thing out there for plug and play.....but there is no way in hell it does the same thing as a full double pass rad.....
Old 08-13-2010, 06:52 PM
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Originally Posted by Highway8
If I experience any overheating on the track now that I am supercharged I will be changing to one oil cooler on the drivers side and a second radiator where the passenger side oil cooler would normaly be.

As an added bonus, removing the stock oil cooler lines would probably remove some weight and increase oil pressure/flow.

This is something I've had in the back of my mind for a while now .

Which country seems to have problems with oil pressure/brg wear ? Yep , the US where they use two oil coolers . The JDM 8s all have only one and probably see higher oil pressure than the US models (can't confirm).
So if you wanted to fit an extra water rad. where the 2nd oil cooler would go ,what would be good to use ? How about one that fits perfectly and even comes with all the cowling to direct air flow. Yes , the one that is already there ......
Old 08-13-2010, 07:04 PM
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It looks like most of the suggestions here are for FI type vehicles where a lot more heat is generated. I chased cooling, and associated A/C problems here and most turned out to be stock fan, stock wiring, relay and "foam" related. Basically, much of it was working as Mazda intended.

I pulled data from most of the folks that have posted to this thread and solved my problems. I stuck data and links in the thread in my signature. If you are starting out with an overheating problem, try this stuff first. I will have the MM fans on early when the Cobb comes in. Then when I pay that off, I will likely go with the thermostat to finish things off for good.

Mike
Old 08-13-2010, 07:18 PM
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Originally Posted by dannobre
And this is relevant why

Come on Jeff.......you have to do better than that

How many Motorsports rads have you installed?

Also...it's a moot point in some series...cause they often can't swap out stock parts

Wanna see some pictures from a couple of teams radiator setups I have friends too
These are not "friends", they are customers.
And their radiators are exactly as I described.
Old 08-13-2010, 07:29 PM
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Originally Posted by Easy_E1
....But for us people that live below the 45th parallel. We like A/C.....

Haha if your reffering to the border between US and Canada it's the 49th.
Old 08-13-2010, 07:50 PM
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Originally Posted by RotaryMachineRx
Haha if your reffering to the border between US and Canada it's the 49th.
The 45th parallel is the halfway point between the equator and the North Pole.
'Tis a bit warmer.
Old 08-13-2010, 09:31 PM
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guys lets stay focused. i would prefer to stick with the street driven casual track day n/a or f/i car.
you get into race teams and what they do and it becomes a different world. Plus they do not have to be concerned about low speed, stop and go and a/c. etc.
Much different world.
Thick rads seem to not work as well on the street due to the average lower speeds and cooresponding less airflow. The air passing through a thick rad gets hotter as it pass's through, lessening its efficentcy. Thickness is sometime unavoidable due to the space available.

The second radiator does increase flow latency --for that system. That is why i choose to use the plumbing i did .
od
Old 08-13-2010, 09:45 PM
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ROFL
Kinda like comparing a nascar to a street car, the only thing in common is the Monte Carlo emblem they slap on the car
Old 08-14-2010, 09:37 AM
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Originally Posted by MazdaManiac

And their radiators are exactly as I described.

Actually all you said was they are Ron Davis and Griffin Rads.....

Not which type.......

Anyway...most people don't need or care about the larger rad that I am talking about

It does belong in the conversation..but I'm not going to labor the point any longer

I still don't get the extra rad and no extra oil cooling argument though...
Old 08-14-2010, 10:49 AM
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The oil coolers are in good airflow and only provide 1/3 overall help. oil temps are not critical for the people i see and myself. they range about 10F higher than coolant temps unless something is wrong. if the coolant spikes to 230-240 on the cars i have seen then the oil stays in line with it. As long as the driver backs off some.
address the coolant and the oil temps will follow--
the biggest issue to me in the winter is getting the oil to warm faster.
on the track with sustained 9k running with a race engine---yep they need help.
now if ypu are still running 5w/20 or not changing your oil until 7k miles then yep --i see your point.
od
Old 08-14-2010, 10:50 AM
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[QUOTE=dannobre;3673766

I still don't get the extra rad and no extra oil cooling argument though...[/QUOTE]

going to a single more efficient oil cooler with 10an lines and a proper oil thermostat would improve the oil cooling system.

For someone with fi or extreme climates that tracks their car, what else can they do besides a sec radiator if they still have heating issues after an upgraded radiator (bhr or mazmart) t-stat, water pump, a vented hood and all systems are functioning properly?

A secondary radiator could be installed for about $100 in parts, which would be one of the cheapest cooling mods.
Old 08-14-2010, 12:31 PM
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Originally Posted by Highway8
going to a single more efficient oil cooler with 10an lines and a proper oil thermostat would improve the oil cooling system.

For someone with fi or extreme climates that tracks their car, what else can they do besides a sec radiator if they still have heating issues after an upgraded radiator (bhr or mazmart) t-stat, water pump, a vented hood and all systems are functioning properly?

A secondary radiator could be installed for about $100 in parts, which would be one of the cheapest cooling mods.

Yes...the oil coolers can be improved..and the thermostat is definitely an area of improvement. I have an Earls Billet one that allows my oil temp to warm up faster..and provides much better cooling than the stock system
I'm on the fence about the single cooler..unless it's a Setrab or similar and big ( just cant seem to pop for the damn thing though (..the cooler I want is close to 1K ) Seems to work better than the stock system though from the guy that uses it

I haven't tried the additional radiator thing because in my mind a bigger..better RAD makes more sense to me.....and was worth the PIA factor getting it in and working

If you spent the cost of the other rads..the other mods...and you likely would end up at the same general price point....so cost isn't really an issue either.

It's like everything else...there is more than one way to do anything..and often the results are the same
Old 08-14-2010, 02:16 PM
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Originally Posted by RotaryMachineRx
As in no crash bar??
yes no crash beam
Originally Posted by 9krpmrx8
And where did you get the 160F thermostat and does it have the bypass built in? Something is not right. Unless you were only WOT for a few seconds.
i work at napa so i was able to track down a stock style therm that opens at 160
Old 08-14-2010, 02:20 PM
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^^^ I think thats a tad too low imo...
Old 08-14-2010, 02:28 PM
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Originally Posted by MazdaManiac
You shouldn't operate your engine under load below 185°F.

You mean like all the Grand Am teams that use the Ron Davis and Griffin (who build the BHR rad)?
why is that? i didnt know its bad for rotarys to run below 180


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