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Old 05-30-2008, 12:08 AM   #1
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Question Help me choose!!!

Ok, no one is responding to my other thread so I have to start another...

I need a new Radiator ASAP. I did a coolant re-route myself and I still overheat. Currently I have a 2" dual core Rad, and it doesnt cut it obviously because I am still overheating. So I need bigger and better things. I know about the Godspeed but I dont know its specs and I think its on back order for 5 weeks... I need it in 2 or 3 MAX.

So I need help. I heard Ron Davis makes custom Rads but I also heard he charges about $900 to do that. So anyone who has any info for me would be GREATLY APPR.

PS main use for car is on the Track. Three 20 min sessions with a 5 min break in between.
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Old 05-30-2008, 12:24 AM   #2
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Ron Davis makes fantastic stuff. They are the best craftsman in the business.

Your radiator does not sound insufficient. Perhaps something else is amiss?
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Old 05-30-2008, 12:28 AM   #3
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Corky,

Here is my list...

I have a 2" dual core rad (I think my rad may have even been designed by you)
Water cooled turbo
coolant re-route that goes cold side
180* high flow tstat


No leaks anywhere. Compression is perfect across the board. Running 50/50 distilled and Dexcool (waterwetter didnt work out well for me)
I am up for ANY suggestions
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Old 05-30-2008, 12:45 AM   #4
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Quote:
Originally Posted by highroller101 View Post
Corky,

Here is my list...

I have a 2" dual core rad (I think my rad may have even been designed by you)
Water cooled turbo
coolant re-route that goes cold side
180* high flow tstat


No leaks anywhere. Compression is perfect across the board. Running 50/50 distilled and Dexcool (waterwetter didnt work out well for me)
I am up for ANY suggestions
not to be off topic but your car is at 18psi and you are only getting 195 hp? im new to turbos and miatas but isn't that a little low? i mean doesn't the begi-s alone on a stock car make 140 hp at like 5 psi? do yu have a stock exhaust or something. enlighten me please.
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Old 05-30-2008, 01:00 AM   #5
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Im at 195 whp @14psi. I am currently boosting at 18psi (havent been dynoed yet). I have a stock exhaust system, yes, but no CAT. Once I get rid of my overheating problems I am purchasing a 3" dp and a 3" straight pipe. I already installed my larger IC. this should put me @ around 260-275whp. Also when I had it dynoed, I was running on a bad clutch(assuming that it probably was slipping) so id say I was probably getting 210whp then
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Old 05-30-2008, 01:13 AM   #6
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Why the hell are you using Dexcool?

Also, unless NH gets below zero often, you can safely go to a 60/40 mix, that'll help you a little bit.
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Old 05-30-2008, 01:13 AM   #7
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Could we get back on topic?
I really need a new Radiator OR the fix to my cooling problems as soon as possible.


-Add- ducting through the rad has been done, and the rear of the hood has been lifted 1.5" to promote under hood dynamics and flow.
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Old 05-30-2008, 01:14 AM   #8
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Quote:
Originally Posted by StankCheeze View Post
Why the hell are you using Dexcool?

Also, unless NH gets below zero often, you can safely go to a 60/40 mix, that'll help you a little bit.
What do you propose I use instead?

Wont be in NH during the winter, only for race season. Car is stored in a heated garage at 72* year round
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Old 05-30-2008, 01:16 AM   #9
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Stank... How do your nordlock washers work? I just put them on mine last week I had to order them specially because they were for 10mm bolts. do they keep the turbo from loosening and falling off? I havent had any expierence with them at the track yet.
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Old 05-30-2008, 01:30 AM   #10
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Yeah, you should try a higher % of water in the mix...also, there are some nice aluminum radiators on ebay for pretty reasonable prices (not as good as the Godspeed deal), but not bad.
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Old 05-30-2008, 01:37 AM   #11
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like....? The Koyo 54mm is only like an 1/8 larger then mine. Im not spending that much for an 1/8 in... Any other recomendations? I was looking at a JVTR triple core Rad and the Springfield Dyno Spec rad... And M2 was telling me about stock car Rads (sounds like a project worth taking on). But mainly Im looking to increase the capacity of the cooling system and increase the time that the coolant spends in the rad to decrease temperatures.
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Old 05-30-2008, 01:44 AM   #12
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Just want to throw this out there, when was your water pump replaced?
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Old 05-30-2008, 01:45 AM   #13
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hasnt been car only has 56k miles on it
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Old 05-30-2008, 02:28 AM   #14
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PS what do you guys think of this....
http://forum.specmiata.com/cgi-bin/u...pic/31/97.html
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Old 05-30-2008, 04:17 AM   #15
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Quote:
Originally Posted by highroller101 View Post
Could we get back on topic?
I really need a new Radiator OR the fix to my cooling problems as soon as possible.


-Add- ducting through the rad has been done, and the rear of the hood has been lifted 1.5" to promote under hood dynamics and flow.
don't...
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Old 05-30-2008, 09:37 AM   #16
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revert to the stock hood design (which creates positive pressure under the hood, which is probably the cause of this problem in the first place)

you need to either put the undertray back on, or extend it and put a lip on the bottom
you need to seal off the mouth of the car, so air is forced through the radiator (smooth shaping makes air go over the rad more evenly)
run 100% water with some of that "gunk" water pump lube (its a track car, be a man)

oh, and I would buy bell's scooper before I bought a $700 radiator...which is dumb.
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Old 05-30-2008, 09:56 AM   #17
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Quote:
Originally Posted by highroller101 View Post
Im at 195 whp @14psi.
this is somewhat embarrasing.....I think some of tyour heating issues could be directly related to your exhaust of choice....you are wasting a hell of a lot of energy trying to push the exhaust out, not push the pistons down.

Quote:
Originally Posted by highroller101 View Post
and the rear of the hood has been lifted 1.5" to promote under hood dynamics and flow.

the only thing this promotes is a cooler engine bay, air will be more likely to flow back into the crack than to extractor from. Effectively, this will increase the pressure behind the radiator. And we all know that high pressure travels to low pressure....so if you equalize the pressure on both sides of the radiator, guess where isn't going to flow through. You need to shroud your radiator. Make it impossible for any airflow entering the mouth to flow around your IC and rad. Seal the top area around the hood latch. Use good fans. Use a almost pure water mixture.
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Old 05-30-2008, 10:45 AM   #18
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Quote:
Originally Posted by hustler View Post
you need to either put the undertray back on, or extend it and put a lip on the bottom
I'm making one now...can you elaborate?
I'm going to extend towards the rear of the car a bit,
but what do u mean by lip on the bottom?
Pic would be great too!



BTW 195whp @ 14psi?? +1 on exhaust prob being a big contributor to the heat problems... I had stock exhaust on for a couple short drives (LOW boost) and it was a killer, heat and perf wise
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Old 05-30-2008, 11:14 AM   #19
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Why anyone would track a turbo miata without an oilcooler amazes me.
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Old 05-30-2008, 11:34 AM   #20
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Quote:
Originally Posted by Braineack View Post
this is somewhat embarrasing.....I think some of tyour heating issues could be directly related to your exhaust of choice....you are wasting a hell of a lot of energy trying to push the exhaust out, not push the pistons down.

I am looking for a new exhaust system currently. I am looking at the Begi divorced downpipe but I dont want a 2.5" I want a 3" and im not looking to spend $400 on an exhaust if the car wont cool down.


the only thing this promotes is a cooler engine bay, air will be more likely to flow back into the crack than to extractor from. Effectively, this will increase the pressure behind the radiator. And we all know that high pressure travels to low pressure....so if you equalize the pressure on both sides of the radiator, guess where isn't going to flow through. You need to shroud your radiator. Make it impossible for any airflow entering the mouth to flow around your IC and rad. Seal the top area around the hood latch. Use good fans. Use a almost pure water mixture.

I have run tests and having the hood lifted in the rear has increased the time it takes to overheat. Radiator has cheap DIY shrouding with stock fans. The mouth of the car is completely air tight right through the rad. On the pure water mix... Doesnt coolant increase the BP of water?
see above
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