Rb20det Idle Fuel ratio varies at idle

Jonh317 · Post by **Jonh317** » Wed Aug 27, 2008 4:53 pm

The fuel ratio is varying from 13.5 to 18afr. The coolant temp are constant in the 80's. Sometimes when i come to a idle it will be very lean and then sometimes it will be rich and at times very rough idle bouncing up and down. I have adjusted the fuel map to get it to be around 14-15afr.

z32 maf in blow thru configuration
880 injectors
t3/4 turbo

kenbam · Post by **kenbam** » Wed Aug 27, 2008 5:27 pm

Whats your latency set at?

Jonh317 · Post by **Jonh317** » Thu Aug 28, 2008 2:08 am

I haven't changed it from 1520 with the current rom, the injector opening time and closing time is 1.130 0.998. I don't know what the stock times are so i don't really have any idea where to move it, so i haven't messed with it.

Jonh317 · Post by **Jonh317** » Thu Aug 28, 2008 2:48 am

I just did a rough calc from the size of the injectors and 1591 is what i got. I will try it, but it probably wasn't a accurate method. I don't know what the proportion of latency to opening time so i couldn't do a calculation that way.

I also have hks 264/264 8.5 cams which might be adding some problems