Project S2000 Koyo ARK MFD2

Project S2000 Part 5: Keeping it From Overheating

By Khiem Dinh

Khiem Dinh is an engineer for Honeywell Turbo Technologies at the time of this writing.  All statements and opinions expressed by Khiem Dinh are solely those of Khiem Dinh and not reflective of Honeywell Turbo Technologies.

A major factor towards building a reliable car is keeping it from overheating.  This requires instrumentation beyond the super inaccurate factory coolant temp gauge (generally three settings: cold/warm/blown head gasket).  Keeping track of oil temperature is also very important for a vehicle that is tracked heavily.  Examples of cars with excessive oil temps include the 370Z and the dual clutch transmissions of the Evo X MR and Nissan GT-R.  Even the BMW 335, when first released, overheated the oil during a high speed Autobahn run (BMW fixed the situation by adding oil coolers to all the vehicles).

Project Honda S2000 Koyo Radiator ARK MFD2
Hooking up the MFD2 is simple: use the cable to attach the MFD2 to the OBDII port, and then hook up the power (either the 12V power adapter or to a 12V source).

In keeping with the theme of making this car as reliable as possible, we’ve added ARK Design’s newly released MFD2 (Multi-Function Display).  The benefit of the MFD2 over the previous MFD is the ability to plug straight into the OBDII port whereas the old MFD required splicing into the ECU harness.  We hate electrical work, and this makes it about as plug-n-play as you can get! 

Project Honda S2000 Koyo Radiator ARK MFD2
I ran the wires for the oil pressure and temperature sensors along the A/C line behind the exhaust manifold heat shield and then along the rear firewall.

Now you can read all the parameters off the ECU displayed in one convenient location.  We also hate having a lot of gauges, so the MFD2’s ability to display up to 8 parameters is a great feature.  The parameters from the ECU include: boost/vacuum, coolant temp, injector %, throttle %, A/F, and rpm.  Of particular interest is the coolant temp off the factory ECU; so now instead of the idiot 3-position dash gauge, we have proper temperature readout.

Project Honda S2000 Koyo Radiator ARK MFD2
There’s a hole in the firewall to run the wires through near the bracket that holds the throttle and cruise control cables.   This hole is used for the factory hood alarm sensor.

The other two parameters we wanted to monitor were oil pressure and oil temperature.  Low oil pressure results in blown engines.  High oil temperatures also lead to blown engines.  Preventing both is essential to a happy engine.  ARK Design makes adding instrumentation for these extremely simple too.

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Wednesday, September 15, 2010 12:54 AM
Like that foam. Btw what exactly does this mean - "Because the S2000 uses a coolant-oil heat exchanger for an oil cooler..." ? Is this a separate unit? Pardon my S2k ignorance is showing. NICE MFD!
Wednesday, September 15, 2010 4:40 AM
The S2000 comes stock with an oil cooler. It uses engine coolant to cool the oil. It's a little donut shaped thing that goes between the engine block and oil filter. Quite a few cars come with oil coolers like this stock.

The Evo uses a separate coil that is a heat exchanger with air for an oil cooler and it's placed on the passenger side of the air dam; what you would typically expect to see on a high performance/race vehicle.

The S2000 oil cooler is properly sized for a street car in that the oil temps hover between 97C-100C in highway cruising in ~80F temps. I think 100C is a generally excepted temp that you want to get your oil to as any moisture/water in it will boil off. But what is sized for a street car does not work for a track car :)
Thursday, September 16, 2010 9:26 AM
Yeah, I'm liking the foam also. Most (none?) replacement radiators don't come with any foam like the stock pieces do, so it's a nice touch that you added it yourself. I might consider doing the same, as I noticed that lack of foam when changed my radiator earlier this year. I just used a stock replacement tho, no shiney Koyo. =) And yeah, my end tanks were leaking, but to its credit, it had lasted a good 220k+ miles.
Thursday, September 16, 2010 5:33 PM
I got the foam idea from the StopTech Evo X time attack car. It's a very well built car if you guys ever get to look at it up close.
Eric L
Eric Llink
Sunday, September 19, 2010 10:34 PM
I bought a used ARC radiator for my RSX and always wondered what that piece of foam was for. My foam is kinda dangling off (old, adhesive died from spilled coolant) and was planning to just pull it off. Now I will be replacing it with some new foam, once I figure out how to cleanly remove the dried foam.
Eric L
Eric Llink
Sunday, September 19, 2010 10:34 PM
er, dried adhesive.
Monday, April 11, 2011 5:22 AM
How do you add an external wideband O2 sensor to the MFD2?
Monday, May 07, 2012 7:54 PM
which koyo radiator is that? they list the /8" version but not the one from the article for an AP2 ...
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