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 higher compression race car with a super charger, I would absolutely get an intercooler.

 

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?

 

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.

 

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.

 

don't forget to post pictures of your melted pistons afterwards.

 

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.

 

Just to clarify, I meant I will definitely go for it - the intercooler.

 

Found this, sounds like bar/plate should be good for my purposes? CX racing 27x6x2.5 be adequate?

 

sure, it will already be a big improvement over the crossover tube

 

Just buy 100 chipset heatsinks and attach them to the crossover tube :v

 

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.

 

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.

 

<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.