NA or TT ECU in FWD TT?

[Beau_Jester]

Is anyone using their NA ECU in their TT FWD cars? How is it working for you?

If you have the TT ECU, did you have to install the TT intake manifold, TT MAF, TT throttle body?

[Hannibalzero]

Originally Posted by Beau_Jester

Is anyone using their NA ECU in their TT FWD cars? How is it working for you?

I have used both. The TT ECU allowed me to run a little bit more boost without knock. I would also get random odd spurts of knock with the NA ECU (although that could have been false knock). The tune was harder to get down.

As far as the butt-dyno goes, I'd say the TT ECU wins.

Originally Posted by Beau_Jester

If you have the TT ECU, did you have to install the TT intake manifold, TT MAF, TT throttle body?

Intake Manifold - no, but the TT ECU won't control VICS. Swapping in a TT plenum wouldn't be a bad idea, but I still use the NA one with the valves set for a short runner path.

MAF - Same as the TT. Just keep your stocker.

Throttle body - slightly different, but not enough to warrant a swap. Then NA DOHC throttle body will work like a champ (plus there's two less nipples to cap off).

[jedimastermopar]

So do you block off the vics then, or just leave it disconnected? not too sure what it does but, it was giving me fault codes and I am planning to go to a turbo setup so I don't want to replace it if I won't be using it anyway.

[Hannibalzero]

Originally Posted by jedimastermopar

So do you block off the vics then, or just leave it disconnected? not too sure what it does but, it was giving me fault codes and I am planning to go to a turbo setup so I don't want to replace it if I won't be using it anyway.

VICS controls the flow of the intake charge. There is a set of butterfly valves inside the NA plenum that direct air through two possible routes. One route curves around the back of the plenum (for low RPM torque). The shorter route allows air to flow directly into the runners (for higher RPM airflow).

Unplugging VICS will disable it. Depending on which path you want air to take, you may need to pull off the VICS cover and set the gear accordingly.

[jedimastermopar]

How is that handled in the TT Intake then. Would the VICS mulfunctioning cause missing on acceleration? How do you have yours set?

[Hannibalzero]

Originally Posted by jedimastermopar

How is that handled in the TT Intake then. Would the VICS mulfunctioning cause missing on acceleration? How do you have yours set?

I set VICS to use the short path. The long path could give you more torque down low, but 9bs spool up fairly quickly as it is. Neither route should cause the engine to miss though.

[jedimastermopar]

Sounds good. Do you leave both harnesses disconnected? What happens to the CEL will it come on?

Sorry Jester I totally Hi Jacked your thread.

[Beau_Jester]

I don't think you hijacked the post. Good info. I never really thought about the position of the butterflies until this post.

If I use a TT ECU, 9Bs and stock VR4 injectors, do I need an SAFC?

[Hannibalzero]

Originally Posted by jedimastermopar

Sounds good. Do you leave both harnesses disconnected? What happens to the CEL will it come on?

Sorry Jester I totally Hi Jacked your thread.

Yes.

No CEL to worry about, since the TT ECU is not equipped to handle VICS.

[Hannibalzero]

Originally Posted by Beau_Jester

If I use a TT ECU, 9Bs and stock VR4 injectors, do I need an SAFC?

No, but it is a good idea. There are a few point where I altered my tune slightly (both adding, and subtracting fuel).