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Old 07-06-2015, 04:58 PM   #1
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Default 10:1 NA6 M45 Race car

Race car on 93 octane. M45 just showed up. 5psi, MSPNP. I am expecting to detune slightly to stay in class.

Will I need an intercooler?
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Old 07-06-2015, 05:22 PM   #2
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For a higher compression race car with a super charger, I would absolutely get an intercooler.
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Old 07-06-2015, 05:41 PM   #3
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Assuming hotside:

Fortunately, the usual complaints associated with intercooling a supercharger, which are mostly about idle stability, are less of an issue in a track application.

In general, high-compression / forced-induction Miatas tend to be knock-limited with regard to ignition timing. Thus, anything you can do to help will help.

Sidebar: 1.6? Really?
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Old 07-06-2015, 05:53 PM   #4
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Quote:
Originally Posted by ericwh View Post
Race car on 93 octane. M45 just showed up. 5psi, MSPNP. I am expecting to detune slightly to stay in class.

Will I need an intercooler?
For a street car, you could get away without it, but power will suffer.

For race car, install an intercooler, even if it's a cheap/small one it will help a lot vs having nothing.
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Old 07-06-2015, 06:02 PM   #5
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Ok thanks guys. Thought it was possibly borderline but I will definitely go for it.

Sidebar, yes. I'll have plenty of power and torque for class. Shouldn't be an issue.
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Old 07-06-2015, 06:27 PM   #6
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don't forget to post pictures of your melted pistons afterwards.
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Old 07-06-2015, 09:46 PM   #7
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Either you get an IC or you can run severely retarded timing while dealing with 2-300F intake temperatures.

W/M injection is also an option, but I suspect you'll want the IC and a bigger boost pulley to make up for the pressure loss over it.
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Old 07-06-2015, 10:53 PM   #8
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Just to clarify, I meant I will definitely go for it - the intercooler.
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Old 07-06-2015, 11:12 PM   #9
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Found this, sounds like bar/plate should be good for my purposes? CX racing 27x6x2.5 be adequate?

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The ebay units are not as efficient and consistent. But they get the job done...

That said it depends on what you want:
tube/fin is ligher and provides better heat exchange at lower speeds
bar/plate is stronger and usually flows more and better at high speeds

We already discussed this at length iirc, search around.
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Old 07-06-2015, 11:24 PM   #10
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sure, it will already be a big improvement over the crossover tube
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Old 07-07-2015, 12:27 AM   #11
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Just buy 100 chipset heatsinks and attach them to the crossover tube :v
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Old 07-08-2015, 12:20 PM   #12
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Check with the guys at All Aspects Tuning in VA.

They run a couple of M45 track cars.

From what I recall they all ran at 4 to 5psi with big intercoolers and water injection. They make around 140whp and are very responsive and pretty bullet proof.

Here is some incar video I gathered from the Ultimate Track Car Challenge a few years back.
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Old 09-09-2015, 03:53 PM   #13
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So I ended up going with an over-the radiator setup - basically copied what comradefks had but with 2" piping.

I was using the base spark map and road-tuned to my AFR targets. First pull was pretty high on the dynojet and I pulled spark advance from the offending RPMS until I had a power curve suitable for the PT dyno reclass I wanted to run.

I posted in the cooling thread this morning but no one responded: how much radiator do I need? I have ducting, hood vents, and coolant reroute but a FMIC.
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Old 09-09-2015, 08:22 PM   #14
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<p>Where/what temperatures do you usually race in?</p><p>I went with the 949 Crossflow. For the price, and assuming it does what it claims to do, I don't see why go any other way.</p>
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Old 09-09-2015, 09:40 PM   #15
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Quote:
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<p>Where/what temperatures do you usually race in?</p><p>I went with the 949 Crossflow. For the price, and assuming it does what it claims to do, I don't see why go any other way.</p>
NASA mid Atlantic @ summit point and VIR. Hottest would probably be like 105? That and the CSF are what I was considering. Is it's max height any different than the stock radiator? Vertical space is at a premium with the over the rad setup.
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