Does anybody have any tips for tuning the intake cam timing on a turbocharged VQ? What benefits/drawbacks are there for different values (0-37 degrees) at low/high boost or rpms? How does it all relate?

Sorry for my dumb question.

 

Think of it as one of those overlapping pie charts. More timing = more power, heat, and stress on the engine. Depending on how much boost, fuel, type of fuel, strength of motor depends how much your motor can take. If your asking this maybe you should have a reputable tuner handle it. If you go to far something is going to go very wrong.

I drew you a picture. Happy birthday.

 

I'm tuning it myself, and yes I am consulting with tuners, but I also wanted to ping the community for the benefit of both myself and others who are curious about the benefits/drawbacks of modified cam timing on the turbo'd VQ.

 

I would also like to know. I have heard that advancing the intake cam will allow the turbos to spool more quickly.

Ojiggyo - doesn't your pie chart apply more directly to ignition timing, rather than cam timing?

 

Good luck getting any real information out of this community without having everyone get butt hurt and telling you to go cry to a tuner.

I have played with mine to see where it gets me and so far it seems like Nissan has it figured out pretty good for a street car. Now if you were building a drag car or some other specific setup I could see maybe setting the cams to retard fully in the upper rev range to increase the ram tuning affect.

 

Yea I know, I've been getting that warm fuzzy over the past month or so LOL.

Cool, I figured as much. I left them stock. From what I read once you start messing with them you will throw a CEL?

 

I didnt notice since I had the cel on for other reasons when I was messing with it. Once my car is up and running again I plan on focusing on the cam tables to see what I can really get out of it.

 

Itll be very hard to do any cam timing tuning without a dyno.

The only thing I can think of is finding a long *** straight road and have someone driving and sit in the passanger seat. At each rpm increment watch the MAF voltage while you are playing with the cam timing. As you adjust the timing to your sweet spot the voltage should go up( because your allowing more air in/being more efficient/ making more power)

Are you doing this with osirus?

 

^^Yup.

Would it be correct to assume the MAF voltage is kind of like hp and the fuel schedule is kind of like tq? They both seem to follow similar paths (respectively) when compared to my dyno sheet.

 

You can sort of think of it like that but I would be a little more accurate to think of fuel schedule as load which is very similar to torque. Either way I wouldnt take it too far, especially if you are tuning on the street since you will only be hitting a couple of load cells during a constant speed while at full throttle you will be referencing higher load cells.

 

It wont throw a CEL, but it will show a code when you hook up a reader.