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10:1 NA6 M45 Race car

 
Old 07-06-2015, 03:58 PM
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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, 04:22 PM
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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, 04:41 PM
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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, 04:53 PM
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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, 05:02 PM
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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, 05:27 PM
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don't forget to post pictures of your melted pistons afterwards.
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Old 07-06-2015, 08:46 PM
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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, 09:53 PM
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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, 10:12 PM
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Found this, sounds like bar/plate should be good for my purposes? CX racing 27x6x2.5 be adequate?

Originally Posted by 18psi View Post
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, 10:24 PM
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sure, it will already be a big improvement over the crossover tube
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Old 07-06-2015, 11:27 PM
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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, 11:20 AM
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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, 02:53 PM
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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, 07:22 PM
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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, 08:40 PM
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Originally Posted by turbofan View Post
<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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