Buying a 6 spd

McTaff · #1 11-25-2008, 04:46 AM

Enough talk.

I'm getting a 6 spd DCCD through 'E'. I'm back in the country mid-Jan and will hopefully get started sometime in the first half of next year. It'll be going in the pearlie. It's my wedding present to me.

dynomatt · #2 11-25-2008, 08:29 PM

Well done...you'll love it

M

svxistentialist · #3 11-26-2008, 02:00 PM

Quote:

Originally Posted by McTaff

Enough talk.

I'm getting a 6 spd DCCD through 'E'. I'm back in the country mid-Jan and will hopefully get started sometime in the first half of next year. It'll be going in the pearlie. It's my wedding present to me.

Good stuff McTaff.

How will you control the DCCD? If you use the TCU from the Impreza, will it work independently of the ECU from the SVX?

Joe

McTaff · #4 11-26-2008, 04:36 PM

The DCCD controller will come with it, as will the R180 w/sensor and so on. What I'm getting is almost a complete kit.

As far as I am aware, the ECU in the SVX doesn't need to receive anything back from the TCU?

I'm certainly not an expert in this area, but there is plenty of knowledge around here to draw on: to be honest the wiring is the part that makes me nervous. In any case, I'm not the first to do this and I'm sure I'll be able to find out here exactly what needs to be done there. I'm not doing the install myself - there are a couple of people on the board who have already offered to help me out and I intend to take full advantage of the experience we have here.

svxistentialist · #5 11-26-2008, 05:48 PM

It is likely the ECU will work OK with the 6 speed, loads of people have put them in.

I'm not too certain of how many may have put in one that uses the DCCD, that's another level of complication. Assuming the DCCD controller "talks" to the gearbox and they get on about their business, I expect all should work OK.

In the SVX the TCU communicates with the ECU. As the gearchanges happen the ECU cuts power [possibly momentarily drops out one side of the flat six, I'm not 100% sure how it works] so that the clutches are saved and the gearchange is smooth. With a manual SVX the ECU does not get this signal, so this communication pattern is not a problem.

However, a problem you will have to overcome is the detente on starting. The engine will not start unless it gets a signal the gearbox is in Neutral or Park. You will have to fool the ECU into "thinking" the auto box is in Neutral.

SFAIK there are possibly two ways to achieve this. The guy putting in your box will probably know how to wire this.

Joe

oab_au · #6 11-26-2008, 06:09 PM

Quote:

Originally Posted by svxistentialist

It is likely the ECU will work OK with the 6 speed, loads of people have put them in.

I'm not too certain of how many may have put in one that uses the DCCD, that's another level of complication. Assuming the DCCD controller "talks" to the gearbox and they get on about their business, I expect all should work OK.

In the SVX the TCU communicates with the ECU. As the gearchanges happen the ECU cuts power [possibly momentarily drops out one side of the flat six, I'm not 100% sure how it works] so that the clutches are saved and the gearchange is smooth. With a manual SVX the ECU does not get this signal, so this communication pattern is not a problem.

However, a problem you will have to overcome is the detente on starting. The engine will not start unless it gets a signal the gearbox is in Neutral or Park. You will have to fool the ECU into "thinking" the auto box is in Neutral.

SFAIK there are possibly two ways to achieve this. The guy putting in your box will probably know how to wire this.

Joe

There is a difference in using the Park or Neutral, for starting the engine. Hopefully Phil will find this, but the engine does a different start up routine when started in P than when started in N. Just my guess.

The other point on the DCCD, is that the original Australian TCU can be set to do the normal control over the center diff in the 6 speed the same as it does in the 4eat with VTD.

Harvey.

Harvey.

legacyau · #7 11-27-2008, 04:25 AM

Quote:

Originally Posted by oab_au

There is a difference in using the Park or Neutral, for starting the engine. Hopefully Phil will find this, but the engine does a different start up routine when started in P than when started in N. Just my guess.

The other point on the DCCD, is that the original Australian TCU can be set to do the normal control over the center diff in the 6 speed the same as it does in the 4eat with VTD.

Harvey.

Harvey.

Hey Harvey does the ecu set a different fuel map in neutral as opposed to being in gear ?

cam