Miatapower List Archive

This read-only message was archived from a public mail list.
Mail From: "Steve Willington" <(email redacted)>

All,

Just thought that I'd pass on the good news that my FM2 passed it's UK
emissions test this morning. The car is running solely on a WB O2 sensor,
both for auto tuning and L3 operation of the Link and the maps have been
tuned only with the WB (I went to RC 550cc injectors about that time as I
was maxing out the 440s at 97% duty cycle).
It failed first time around though on fast idle lambda (2500-3000 rpm), the
accepted range for Lambda is 0.97 to 1.03, with 0.97 rich and 1.03 lean. It
was 1.07 (quite a big miss), even with the sensor pushed as far into the
exhaust system as possible. My car has duals, so on a hunch I decided to
plug the passenger side exhaust tip, just in case air was getting in there.
Well as soon as it was plugged Lambda fell to about 1.01 and it passed. Here
are the final figures (lambda is higher here, this is the max figure reached
during the constant fast idle):

Fast idle (2840 rpm)
CO 0.01% (max allowed 0.3% vol)
HC 32 ppm (max allowed 200ppm vol)
Lambda 1.030 (allowed range 0.97 - 1.03)

Natural idle (844 rpm)
CO 0.14% (max allowed 0.50% vol)

This is on a 1.6L with 550 cc injectors, maps tuned solely with the WB and
FM cat with turbo dual exhaust.

Steve
FM 2 @ 15 psi.
www.mx5-zone.com/steve.html

This read-only message was archived from a public mail list.
Mail From: "Steve Willington" <(email redacted)>

All,

Just thought that I'd pass on the good news that my FM2 passed it's UK
emissions test this morning. The car is running solely on a WB O2 sensor,
both for auto tuning and L3 operation of the Link and the maps have been
tuned only with the WB (I went to RC 550cc injectors about that time as I
was maxing out the 440s at 97% duty cycle).
It failed first time around though on fast idle lambda (2500-3000 rpm), the
accepted range for Lambda is 0.97 to 1.03, with 0.97 rich and 1.03 lean. It
was 1.07 (quite a big miss), even with the sensor pushed as far into the
exhaust system as possible. My car has duals, so on a hunch I decided to
plug the passenger side exhaust tip, just in case air was getting in there.
Well as soon as it was plugged Lambda fell to about 1.01 and it passed. Here
are the final figures (lambda is higher here, this is the max figure reached
during the constant fast idle):

Fast idle (2840 rpm)
CO 0.01% (max allowed 0.3% vol)
HC 32 ppm (max allowed 200ppm vol)
Lambda 1.030 (allowed range 0.97 - 1.03)

Natural idle (844 rpm)
CO 0.14% (max allowed 0.50% vol)

This is on a 1.6L with 550 cc injectors, maps tuned solely with the WB and
FM cat with turbo dual exhaust.

Steve
FM 2 @ 15 psi.
www.mx5-zone.com/steve.html