ive searched this topic a little, mainly ive seen it done alot on the 5.5 gens were they go to the dealer and with the special obd2 scanner they can reprogram the computer to have a more advance time of 17 degrees compared to 15 degrees. which yeilds quicker response and better fuel economy. granted you gotta use 91 or better octane gas. . .
so my question is is there a way to do the same thing with our 4th gens other than putting a piggy back ecu to it and reprogramming it manually???

 

There have been quite a few threads on this already, as well as an extensive one in the all-motor section. You can get the details by searching so I will give out a quick summary.

-The 4th gen ECU does not have the ability to store or remember parameters in this regard, thus only 2000's (5th gens) and newer can have the timing advanced +2 degrees with the consult interface.

-Someone did some dyno runs and found that the two degree increase didn't really help all that much. In reality it was only about 2-4whp in this one person's particular scenario

-4th gen VQ30DE timing is much more aggressive in the lower and upper ranges than 5.5 gen ignition timing. Especially in the upper, but that has to do in part with our USIM's losing volumetric efficiency at higher RPM anyway. While still slightly more aggressive, in the midrange which is where the meat of our powerband is, the 4th gen ignition timing isn't much more aggressive than the 5.5.

-Advancing timing on the cheap can be done however. As the mixture is artificially leaned out by an AFC (air flow converter) such as the SAFC or VAFC, the 4th gen ECU adds ignition timing. Since leaning out the mixture AND advancing the ignition timing is a horrible idea which will most likely cause the car to knock, you need to either up the fuel pressure or use DEK (2000 or 2001) injectors which are actually the same injectors as 350z injectors. This will cause the car to run rich, you use the AFC to lean it out, and your mixture is back where you started, but with advanced ignition timing. This is what I will be doing with my 00vi swap since I will be using the larger injectors from the DEK and will need to do a tune anyway.



Hope that helps!

 

thanks!!!
i really forgot to look in the motor section for the info
now i know

 

I can advance my timing to what ever i want

 

^ EMU.

 

thats cuz you got the emanage. . . LUCKY!!!!! lol

 

Emanage Ultimate

 

sorry i just had to be a smarta$$

 

I was thinking what If you can just put in the injectors on all 6 cylinders

and the car has a USIM and the car Is bone stock and I am sure the car

might throw some codes and possibally a SES light...RIGHT ?. If this works

will this be harmful for the engine?

 

...do what? If what works?

What are you talking about?

 

you know put in the injectors. on all 6 cylinders though.

 

 

i dont know about you but my car already has 6 injectors

ibifhad12injectorsicouldgosuperfast

 

Yeah, I have no idea what you were trying to say here.

If you're talking about aftermarket injectors, or bigger injectors...then it would probably run rich and you'd have to have a method of leaning it out. I'm not sure if that's "harmful" to run rich all the time, but it's kinda useless unless you're FI.

 

I was trying to say If I can use the 350z injectors or the 5th gen(00-01) INJECTORS.

 

Not without it running rich, and not with the VQ30DE LIM...

 

Why...what's the point?

 

I have a friend that just did his car, but he has a z32 maf and the 5th gen

injectors with a cold air intake and some aftermarket headers and he is

having better trottle response in the high range.

 

If he is using the 5th gen injectors he probley has a 00vi. The 5th gen injectors wont work with the 4th gen fuel rail. as pmohr stated earlier

 

Basically the only reason to do this on an otherwise fairly stock engine is to make it run rich. When you do this you need to use an airflow converter (VAFC or SAFC or similar) to modify the mass air flow reading and trick the ECU into thinking less air is going in than there really is. By tuning this way you then bring your air to fuel ratio back down to normal levels. Since our ECU's base ignition timing off airflow, this effectively advances your ignition timing.