Pro EFI

phunk · 06-13-2014, 02:16 AM

The FCON V Pro, I mean, I guess you COULD run it... but while a full standalone, the FCON could not run even a VQ35DE without the stock ECU, let alone a VQ37VHR. So say you spliced it in with the VHR harness anyway (pretty easy), here are some problems:

1: you are stuck using MAFs. Speed density isnt an option with VVEL... then again, this should be the case with any EMS not just the V Pro, wouldnt it?

2: Accel / Decel fuel trims. So, you splice into your TPS sensors so you can manage your accel and decel trims. Thats going to be an issue when your VVEL system is adjusting engine load with the valvetrain rather than the throttle bodies. VVEL causes changes in engine load that are not directly reflected in the actions of the throttle plates. The VVEL system is the last thing to touch the air before it enters the cylinders and the throttles obviously are none the wiser... to get this to run clean, you are going to need an EMS that is aware of the VVEL system and what its doing as its doing it... and you are going to need a secondary accel fuel trim map that is based on the actions of the VVEL system. ami right? I see this as being more hassle than its worth as far as setup and configuration with any EMS at all unless one of the manufacturers steps up to the plate and puts the features clear and easy in their software.

So, you can put the FCON in there and start it up... but I dont know who is going to enjoy driving that car for more than a few minutes without functional accel/decel trims

37winner · 06-13-2014, 03:33 AM

Quote:

Originally Posted by phunk

The FCON V Pro, I mean, I guess you COULD run it... but while a full standalone, the FCON could not run even a VQ35DE without the stock ECU, let alone a VQ37VHR. So say you spliced it in with the VHR harness anyway (pretty easy), here are some problems:

1: you are stuck using MAFs. Speed density isnt an option with VVEL... then again, this should be the case with any EMS not just the V Pro, wouldnt it?

2: Accel / Decel fuel trims. So, you splice into your TPS sensors so you can manage your accel and decel trims. Thats going to be an issue when your VVEL system is adjusting engine load with the valvetrain rather than the throttle bodies. VVEL causes changes in engine load that are not directly reflected in the actions of the throttle plates. The VVEL system is the last thing to touch the air before it enters the cylinders and the throttles obviously are none the wiser... to get this to run clean, you are going to need an EMS that is aware of the VVEL system and what its doing as its doing it... and you are going to need a secondary accel fuel trim map that is based on the actions of the VVEL system. ami right? I see this as being more hassle than its worth as far as setup and configuration with any EMS at all unless one of the manufacturers steps up to the plate and puts the features clear and easy in their software.

So, you can put the FCON in there and start it up... but I dont know who is going to enjoy driving that car for more than a few minutes without functional accel/decel trims

Have you done this before or is this a speculation?

phunk · 06-13-2014, 02:48 PM

Quote:

Originally Posted by 37winner

Have you done this before or is this a speculation?

I used to run the FCON on the DE's. I was the first person in the USA to run it, and tested the patch harness that HKS was releasing. Actually made the DE stock engine power record with it during the first tuning session, and held it for years! So I am pretty familiar with the FCON... although there are parts of it I never bothered to learn.

To answer your questions, no I have not put the FCON in the 370z... but that doesnt make my concerns purely speculation either. For if those issues didnt exist, I would have already put the FCON in my car. The FCON is by the far the cleanest and easiest to use EMS I have tried... it may be lacking some of the cool features but you cannot argue how easy it is to make a car run perfect with it. I would jump on it in an instant if it were realistic for the 370z.

06-13-2014, 02:16 AM	#1 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,669 Drives: 370 Rep Power: 974724	The FCON V Pro, I mean, I guess you COULD run it... but while a full standalone, the FCON could not run even a VQ35DE without the stock ECU, let alone a VQ37VHR. So say you spliced it in with the VHR harness anyway (pretty easy), here are some problems: 1: you are stuck using MAFs. Speed density isnt an option with VVEL... then again, this should be the case with any EMS not just the V Pro, wouldnt it? 2: Accel / Decel fuel trims. So, you splice into your TPS sensors so you can manage your accel and decel trims. Thats going to be an issue when your VVEL system is adjusting engine load with the valvetrain rather than the throttle bodies. VVEL causes changes in engine load that are not directly reflected in the actions of the throttle plates. The VVEL system is the last thing to touch the air before it enters the cylinders and the throttles obviously are none the wiser... to get this to run clean, you are going to need an EMS that is aware of the VVEL system and what its doing as its doing it... and you are going to need a secondary accel fuel trim map that is based on the actions of the VVEL system. ami right? I see this as being more hassle than its worth as far as setup and configuration with any EMS at all unless one of the manufacturers steps up to the plate and puts the features clear and easy in their software. So, you can put the FCON in there and start it up... but I dont know who is going to enjoy driving that car for more than a few minutes without functional accel/decel trims __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph Last edited by phunk; 06-13-2014 at 02:46 AM.