I know that many here use a SAFCII to tune their cars, but I've heard from reading around here that on the A33B the ECU can learn around the tune and undo all your hard work. I was wondering just how the SAFCII connects to the car? Whether it just relays info to the ECU, or takes the signal from the ECU and alters it, thus bypassing it and making sure there's no way the ECU can learn around the AFC. Are there any special notes I should pass on to the shop doing the install? Or the tune? I was thinking of getting rid of the SAFC2 and getting a Greddy Blue instead.

 

just get the EU, more tables to tune with, you'll get more power from an EU

 

I don't want an EU. The SAFC would be able to do the job just fine as long as I know it'll work. The Greddy Blue I can get for a good deal, but I'd only get it if I know the SAFC won't work. The EU would be somewhere like twice the price of the Blue and I wouldn't be able to justify the extra cost.

 

Anyone?

 

the only time i have seen a nissan/infiniti learn around a safc/vafc tune was when it had factory widebands like the A34 and G35 after 2004.5. the afcs just manipulate the maf readings to see more or less air which in turn changes the fuel trim. the ecu knows something is funny when the maf sees a certain amount of air and the wideband o2s are seeing something different.

i ran a vafc2 with no issues of it changing the tune on my 2k1 maxima for over a year, it has the same narrowband o2 sensors setup that the 5.5 gens have.

 

Thanks, that helps a bit.

 

sorry i ment to say EMU, as in engine management unit, check ebay i saw acouple the other day that were cheap.

 

there is an EU btw. stands for E-manage Ultimate but i think that would be a little overkill for n/a bolt ons.