cold start afr's

Fordy · Post by **Fordy** » Sat Nov 28, 2009 8:28 am

what afr's do people tune the cold start fueling to on a sr engine?

gunni · Post by **gunni** » Sun Nov 29, 2009 10:27 am

How cold?

As it´s very different .

RomChip200 · Post by **RomChip200** » Thu Feb 18, 2010 9:38 pm

0°C outside.

from 10.5 to 11.5 for few seconds then goes up quickly around 12, then standard warmup process ...

Fordy · Post by **Fordy** » Fri Feb 19, 2010 5:10 am

i gave up on cold start afr's just couldnt get them stable enough with the old mapping i had

might try again since its snowing again

skylinegtrhr · Post by **skylinegtrhr** » Fri Feb 19, 2010 5:52 am

Last month we have minus 15 C and we just have put new JUN intake manifold with NISMO 740 cc and Z32 MAF so we made only base K-factor adjustment and A/FR was about 15 after warmup, at start was about 11 and goes up very fast and car was starting from first crank ...
We didn't have to do any additional adjustment (only K factor) but I must said that sparks are normal type .