POSSIBLE vipec issue with r32 gtr atessa

[NismoS-tune]

So I got a plug in vipec install this fall and since the installation, I have had constant intermittent losses of AWD due to a TPS fault which doesn't affect the ecu but only the atessa unit. Now, I'm not saying it's a vipec issue since we also replaced the intake plenum (removed the TPS to install) but some have said it may be.

Anyways, I've found some information by a few others on SAU who had this issue with their GTRs with vipecs and autronic ECUs and found that the ecu was causing a slight voltage drop that faulted the atessa unit. I'm not the only Gtr owner with a vipec or autronic so have any others experienced weird AWD issues with the car? If this is a dead end, I have no choice but to start replacing parts as trouble shooting is getting trickier with the engine out. Thanks to those who may have some information. Worst case I ditch the AWD rofl.

[NismoS-tune]

Ok, got some more information.

The V-88 was the one causing some issues so I'm back on the scratch pad. Should I kick the Atessa and drop to a 25 gearbox and pan? lol. Ongoing.... open to ideas, going to open the main harness and do some hard tests on it. Next will be TPS, then atessa unit.

[xcye]

Ok, got some more information.

The V-88 was the one causing some issues so I'm back on the scratch pad. Should I kick the Atessa and drop to a 25 gearbox and pan? lol. Ongoing.... open to ideas, going to open the main harness and do some hard tests on it. Next will be TPS, then atessa unit.

I peronally think that the ATESSA system is the core of a GTR. That's the reason that GTRs won all those races in the past. So, I'd keep Atessa. Otherwise, I would just buy a GTS.

[BNR32GTR]

Hey Franc,

I'm curious to see what you find out, I also am looking at running a ViPec so it's nice to see what people are experiencing with them, this is one of the first problems i've heard with them.
Keep thread updated !

Corey.

[NismoS-tune]

Well, it's probably just a coincidence that the problem started happening when the vipec was installed.

[GTR-Dad]

My clutch pack was gradually dying, but ATTESA worked fine with my ViPEC.

I've recently installed an OS Giken box with a new transfer case. The R32 speedo adaptation to the R33 box crapped out and currently reads zero all the time. This affects ATTESA!

Dan

[Willis]

Sorry to bump an old thread but I was reading in my ViPec manal and in the back there is a "known issues" section.

On some GTR and 4WD models a warning light may be displayed on the dash. This may be due to the value of the ECUs TPS Out signal level being too low. A solution to this is to slightly rotate the TPS to increase the closed throttle voltage. Remember to do a TPS cal after moving the TPS.

So when you are on the dyno tuning and seting up a ViPec it might be best to get a higher closed voltage and a new Cal. Seems like an easy fix.