sorry, you are right, i wasnt paying attention to the legend!!

now you got me thinking if their wide band lambda sensor is just fux0red?!? see.. both brad's and my A/F is exactly the same (blue:blue, red:red)... maybe just a calibration issue?

m

 

Pretty odd... I don't know what to make of it. Anyone an expert?

 

for the Air/Fuel ratio,
the closer the Line is to 10, the Richer the system is.

those Spikes in HP, correspond to a spike in a Lean A/F curve.., maybe that was a detonation fluke.. because your other runs seem to be quite smooth.

 

Thanks for the insight.

 

Has anyone tried the procedure in the service manual to "re-learn" the air fuel mixture. I've done the procedure but can't spend money on a dyno until after my new 5AT gets installed (started whining and shifting a little out of sync).

 

What is the procedure to "relearn" the ECU?

 

So, in conclusion, should we get the Fram filter?

 

In conclusion, the 350Z has a well-designed oem CAI.

 

No. The FRAM filter doesn't fit as tightly (just by a hair) as the OEM or K&N. I've actually put the OEM filter back in this week. At only $9 a pop I'll change it out monthly if I want.

I used the $7 FRAM to prove a very simple point. You don't always get what you pay for spending money on "performance" filters!

 

theory:
our stock fuel/air mapping is already lean(-er) than normal.

hypothesis:
due to the induction of a higher free flowing intake system, there is more cooler / denser air getting into the engine. thus creating an even leaner fuel curve. engine senses this, and retards ignition to prevent knocking.

data:
skidazzles zero gain w/ injen intake after running 300+ miles on it. other private dynos that have displayed little gains.

conclusion:
our hypothsis can not be proved just yet, with my ECU being dissected and changed, the research/results might yeild more conclusive answers at a later point ~2weeks after the car is dyno tuned and ignition/A-F changed from stock


any thoughts?

 

I just read an article on the air/fuel ratio on Tech Talk and the optimal air/fuel ratio for POWER is about 12.5 or so. At 14.7, fuel effiency is maximized...

Still, this does support the dyno sheets since the FRAM got the A/F ratio closer to 12.5 as compared to the K&N.

 

Could not have thought it better myself! The computer will learn eventually . . . I think. But this is nonsense, cant wait to be able to know exactly what the ECU is doing. Even if we never really know I cant wait for us to be able to tell it how we want it to behave. With clever intake and exhaust mods and an ECU to compliment we may see 350hp at the crank.

 

Does all this simply mean we will not see the effects of a K&N or CAI until the Nismo ECU appears?