running lean at top end

[NJR Racing]

i cant seem to get the a/f ratio at .90 at anything above 5500.....i have the 255lph and 550cc......no matter how much i richen the afc at around 5500 its goes to about .85 and stays there......i have change the fuel filter and still does it.....any ideas will help.....

 

[nine5raptor]

what is your boost set at?? and what is your knock/timing/egt/whatever you have for us?

 

[jmc94gsx]

Fuel pressure

 

[gtrvspec01]

samething happened to me. AFC can only do so much. That's why I am saving money for power FC.

 

[jdmawd]

Originally posted by NJR Racing
i cant seem to get the a/f ratio at .90 at anything above 5500.....i have the 255lph and 550cc......no matter how much i richen the afc at around 5500 its goes to about .85 and stays there......i have change the fuel filter and still does it.....any ideas will help.....

How about you post your timing advance and knock sum at 5500 and above.

 

[NJR Racing]

i have no kind of logger but i need one bad......i have the afcII which supposally monitors knock but i dont trust it......my egts get to around 1550.......i know this is safe but i dont know why my car goes lean....when i had it on a dyno at around 5500 the a/f would go from 11.5/1 to about 12.5/1......i need a logger real bad......

 

[jmc94gsx]

Originally posted by NJR Racing
i have no kind of logger but i need one bad......i have the afcII which supposally monitors knock but i dont trust it......my egts get to around 1550......

Upon reading the SAFCII's manual I came to the same conclusion. I am more skeptical of the "knock correction" aspect of it, honestly I wouldn't trust this at all. It seems this is for demonstrative purposes only, like the blue wire mod. Although I would be curious of a comparison of TMO's datalogger and SAFCII's knock readings.

 

[NJR Racing]

my boost is set at 18psi.....egts aroung 1550......

 

[kpt4321]

You cannot trust O2. Look for spikes in the EGT as you pull through the higher rpm's, this would indicate timing being pulled due to knock. As long as you have no knock, you are fine.

Just blind richening of the SAFC is not going to get you anywhere.

AFC can only do so much. That's why I am saving money for power FC.

A power FC will do no more than a SAFC, if the fuel system is not capable of keeping up with the airflow up top. Nothing.


.....Kyle T.

 

[TSiAWD666]

Originally posted by jmc94gsx


Upon reading the SAFCII's manual I came to the same conclusion.

I would hope so, the english version of the wiring guide flat out states that you can't read the knock signal on our car. Check the little note underneath the harness picture in the wiring guide on Apex-i's website.

 

[nine5raptor]

For the 2g's, I knew you couldn't, but the 1g's can't either?