We have installed an s2000 engine/trans in a 1960 Nash Metropolitan, using all the wiring, instuments, steering column, computer, cruise control, radio, ac and some other parts. We are close to wiring the car and I"m concerned because we do not have the EVAP system or air pump on the car. We want to use the computer that came with the motor, but need to know how to satisfy the ECM as regards these systems. Has anyone made a similar swap, or for racing purposes deleted any of these systems?
Thanks,
Sid

 

IMO, in a custom car like that I would use a AEM EMS or other stand alone managment, you'll be able to get rid of a lot of the emission items.. tune the car to make more power and still get great gas mileage... And produce less emissions than it would with a Carb-ed V8.
GL


Post up some pics..

 

IMHO fergetabout all the stock Honda electro stuff. AT LEAST AS FAR AS THE MOTOR IS CONCERNED. I mean it's cool that you've basically duplicated the entire wiring setup, however, the only guy I EVER saw get it to run AT ALL IN A RACE CAR had to tape an (THE?) ignition key to the ECU. Something about a radio transmitter in the key, or something.

I use an Electromotive Tec III with a GM MAP sensor the Honda throttle position sensor, air temp sensor and coolant sensor.

We tune only for wide open power and so far have gotten 238 RWHP.

Oughta make that Nash hall the sushi.

BTW I think the S2000 has an EGO sensor on both the front and back of the cat. You might be able to feed the rear wiring a reference voltage, but then I'm not smart enough to tell you how

All the best,

Jim

P.S. one ? Why a Nash?

 

It can be done with the factory ECU. Your setup sounds like my clubbie (See www.speedracersportscars.com.au). I expect you are already using the lock barrel and key with the chip in it.

The EPS and air pump have diagnostic sensing back to the ECU. You will need to trick the ECU into seeing the same voltage. The EPS is simple and requires a 12v signal back to the ECU ( blue wire). The Air pump needs a resistor in place of the vacuum line solenoid that turns the valve to the exhaust side of the head on. Try a 1K resistor. In my market the air pump has a 12 volt sense back to the ECU to show if its working. In your market the air pump itself has a current shunt that shows if the pump is operating. I would retain the air pump relay and current shunt and use a headlamp globe or two in parallel to load up the circuit and return the sense signal to the ECU. It will get people worried when the engine bay lights up for the first 60 seconds on startup.

Good luck, I'm getting close to finishing my car. Once I fill up the cooling system I'll be able to attend to these items myself and offer more detailed information


Speedracer.

 

Sid,

Neat project, but I really need to see some pictures of a S2K-powered Nash Metro!!!

Talk about a retro rocket , but that first high speed turn could be an eye opener
Brian

 

Please tell me you aren't using the stock wheels and tires!

 

The EVAP system will probably be the most difficult to duplicate. the monitors the PCM runs to check for EVAP leaks are pretty complex, I'd bet it would be easier to install the EVAP system then try and build a simulator to make the PCM happy.

I'd go for a Mugen PCM, that way none of the OBDII EVAP, Airpump, Catalyst systems are supported. You would even get a little power out of it.

 

Here are some photos of our Metropolitan project taken early in the summer. In order to cut cost, I really want to use the ECM that we have. We do have the correct key assy for it. Thanks,
Sid

 

Looks like a fun project.

 

Your going to need to add the EVAP system, and airpump if you want to be CEL free with the stock PCM. There are ways to fool the PCM to think a catalytic convertor is there, but nothing like that for EVAP.