How does V-Pro work (piggyback)? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

ru' · 29th August 2008, 08:58 AM

Any clever preople know how v-pro works in piggyback mode?

I'm guessing it takes the readings from the various sensors, modifys them and sends them to the standard ECU?

Does the standard ECU then control ignition and fueling etc., or does this go back through the v-pro?

Can't get my head around it.

DeanN · 29th August 2008, 09:08 AM

It's not programmed, it doesn't alter settings, it's just using magic... wooooo

ru' · 29th August 2008, 09:14 AM

Damn those HKS boys are clever!

Stony · 29th August 2008, 04:13 PM

I didn't think the Vpro was a piggyback. When you say piggy back mode i think it does that just to maintain the stuff the car needs like tach signal and gage cluster inputs. everything else is bypassed thru the vpro and is tuned via a laptop with a HKS trained Pro tuner.

ru' · 29th August 2008, 05:28 PM

That appears to be the case indeed; maybe piggyback is the wrong description, but it's wired in with the standard ECU.

cwtt · 3rd September 2008, 02:30 PM

The Vpro has complete control over the engine (fuel, ignition, etc). The stock ecu is still there, but only to control things such as AC, traction control etc. The stock ecu has no control over the motor.

The Vpro is a amazing. If I could just emulate the dongle I will be much happier

ru' · 3rd September 2008, 05:49 PM

Cheers, good luck with the search for the golden dongle...

hodgie · 3rd September 2008, 07:12 PM

I have seen a post somewhere by one of the tuners and apparently it can be used as a piggyback or a stand alone ecu.

29th August 2008, 08:58 AM	#1 (permalink)
ru' New Users Join Date: Feb 2007 Location: Black R33 GTR V-Spec Posts: 2,026	How does V-Pro work (piggyback)? Any clever preople know how v-pro works in piggyback mode? I'm guessing it takes the readings from the various sensors, modifys them and sends them to the standard ECU? Does the standard ECU then control ignition and fueling etc., or does this go back through the v-pro? Can't get my head around it.

3rd September 2008, 07:12 PM	#8 (permalink)
hodgie MODERATOR Join Date: Oct 2003 Location: Sat in my Car Posts: 4,950	I have seen a post somewhere by one of the tuners and apparently it can be used as a piggyback or a stand alone ecu. __________________ 720 spinner at Spa, GTROC SW Rep. Hodgies Skyline GTR Site --

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29th August 2008, 09:08 AM	#2 (permalink)
DeanN GTR Register Member Join Date: Jun 2007 Location: Lancashire Posts: 174	It's not programmed, it doesn't alter settings, it's just using magic... wooooo

29th August 2008, 09:14 AM	#3 (permalink)
ru' New Users Join Date: Feb 2007 Location: Black R33 GTR V-Spec Posts: 2,026	Damn those HKS boys are clever!

29th August 2008, 04:13 PM	#4 (permalink)
Stony GTR Register Member Join Date: Sep 2007 Posts: 64	I didn't think the Vpro was a piggyback. When you say piggy back mode i think it does that just to maintain the stuff the car needs like tach signal and gage cluster inputs. everything else is bypassed thru the vpro and is tuned via a laptop with a HKS trained Pro tuner.

29th August 2008, 05:28 PM	#5 (permalink)
ru' New Users Join Date: Feb 2007 Location: Black R33 GTR V-Spec Posts: 2,026	That appears to be the case indeed; maybe piggyback is the wrong description, but it's wired in with the standard ECU.

3rd September 2008, 02:30 PM	#6 (permalink)
cwtt GTR Register Member Join Date: Feb 2008 Location: San Diego, California Posts: 10	The Vpro has complete control over the engine (fuel, ignition, etc). The stock ecu is still there, but only to control things such as AC, traction control etc. The stock ecu has no control over the motor. The Vpro is a amazing. If I could just emulate the dongle I will be much happier

3rd September 2008, 05:49 PM	#7 (permalink)
ru' New Users Join Date: Feb 2007 Location: Black R33 GTR V-Spec Posts: 2,026	Cheers, good luck with the search for the golden dongle...