I don't understand how they can sell you a SC and not offer any sort of warranty on it. I understand that Vortech probably can't transfer the warranty, but Z1 should at least offer some warranty considering they sold it to you.
I think the fact that you have had SO many issues with the car, dating back to the actual weekend that Z1 was supposed to install it makes me believe that Z1 is a company that I would NEVER deal with.
I hate that this has happened to you, and I hope that you get the SC running right without any issues.

 

From the service manual regarding traction control system. See the info about fuel being cut to the engine.

TCS Function AFS001KY

The wheel spin of the drive wheels is detected by the VDC/TCS/ABS control unit from the wheel speed
signals from the four wheels, so if wheel spin occurs, the rear wheel right and left brake fluid pressure
control and engine fuel cut are conducted while the throttle value is restricted to reduce the engine torque
and decrease the amount of wheel spin. In addition, the degree the throttle is opened is controlled to
achieve the optimum engine torque.

Depending on road circumstances, the driver may have a sluggish feel. This is normal, because the optimum
traction has the highest priority under TCS operation.

TCS may be activated any time the vehicle suddenly accelerates, suddenly downshifts, or is driven on a
road with a varying surface friction coefficient.

During TCS operation, it informs a driver of system operation by flashing SLIP indicator lamp.[B]

 

So, it cuts air and fuel? I can't imagine the car cutting ALL fuel from the motor. In fact, the manual goes on to say that after 'slip' is detected "the degree the throttle is opened is controlled to achieve the optimum engine torque." This would imply that fuel is STILL being delivered, but at a lower rate??? You can't have torque without spark, air, and fuel. So, if VDC Cuts fuel (as in lowers injector duty cycle), closes the throttle to optimzie torque (why my boost disapeers as my boost guage is referencing the plenum), and timeing is left unchanged then we get a total understanding of whats really going on??? These are all assumptions, and I could be completely wrong, but I don't think Nissan engineers would pull ALL fuel from a running motor.

Heck, I'm the person on here who should be preaching to shut VDC off all the time anyway!

And as far as staning behind work and sales (an attempt to stay on topic):

Any company that doesn't stand behind what they offer won't be offering anything for very long. The last thing anyone wants to do is buy something with no support. I saw it all the time when I installed car alarms. People would have ma and pa shops install alarms and when they had a problem with them the shop wanted nothing to do with them. Those people came to us and NEVER would go back to the original shops. People tend to only be repeat customers at places that take care of them.

 

Kevin-- Your VDC module works superbly by the way. If your instructions gave specific wire color codes (for the back of the VDC off switch), it would be ideal.

I went through the service manual but couldn't find any additional info as to how VDC works to cut engine output. The most sensible way would be for the drive-by-wire throttle position sensor to be hijacked by VDC to "lift off" the gas pedal electronically even though the driver keeps it to the floor. This would not be expected to create a lean condition leading to detonation under boost. It would be exactly like taking your foot off the gas--boost would immediately go down along with engine power. If that were the case, not only should boost go down, but RPMs should immediately go down. Is this the case in your experience? If RPMs stay up but power goes down, that would be, essentially, fuel starvation and that would be very bad under boost. So, when the manual says "fuel is cut"--that's a worrisome statement. I wonder if a Nissan factory technician could help us out with this one.

In any case, when I'm driving aggressive, I don't want VDC on--it just fights what I'm intending the car to do at the expense of my brakes and possibly my engine.

 

Yes, I would agree that under spirited driving conditions VDC should be off, I guess I just have a problem with someone blaming a blown engine on it, as I don't think there are enough details given. I will have to check the RPMs, but I'm almost positive they drop. The manual says that the throttle body is closed to maximize torque. Also, I had always heard that the 'drive by wire' system was designed soley for VDC (so the engine could have complete control of the car). Who knows?

As far as the module goes, thank you for the compliments. The module is intended to be a universal module to work with ANY car with a traction control system, thus making it almost impossible for us to record wire colors in every car! Its been a while since I've looked at the install manual, but I believe you are correct in that it is fairly vague. I'll take a look at it this week and see if I can clearify some things, do you by chance remember what color your switched wire was?

Thanks,

 

KP-- I posted the wire color info in another VDC post near this one. For the G35 and 350Z, module black goes to back-of-the-switch black; module orange goes to switch dusty blue/black; module yellow goes to red/black in the ignition switch harness as your instructions thankfully indicated.

 

So backagain, What's going on with the car?

Still having problems?

 

car seems to be riding fine now. could it be low fuel doing this ? it start running fine when i filled up with gas.

 

Backagain, any update on this? I will be putting my car back on the road in next few days and will see if my car is still having the same problem.

 

Yep, any update backagain. Thanks for being open about your problems you are having. Because of this, I am not having my SC installed at Z1 Motorsports. I am having it done at Autolabz in Bham, AL.

 

having same problem. Pissing me off big time.

 

car runs fine as long as i have more than 1/4 tank of gas, any less then the car will bog down into limp mode.