Citroen C4 with V6 conversion
Discussion
dqwill said:
Hi, I am planning to do a conversion of my 1998 Peugeot 406 Coupe 2.0L 16v 135bhp to a 3.0L V6 VVT from another Peugeot 406 Coupe, so would like to get some information from you as to what i may need from the seller 
This is no small undertaking. You have to be aware of the different wiring standards that were in place across the 406 range during its lifetime.The 406 was originally introduced in 1996. The wiring was much more simple then than it was in later cars. The Peugeot model designation for cars made between 1996 and mid-1999 is "D8".
The facelift came in around mid-1999. No visual difference for the Coupe, but the wiring and running gear changed then. Peugeot began to introduce multiplex wiring, and they changed the instrument clusters and centre console. The ECU was complemented then by a BSI (built-in systems interface) chip. Cars from this point onwards are known by the model designation "D9".
A further change came in around 2001, when they introduced the COM2000 control stalk system. This meant even more of the wiring was multiplexed.
If you're going to change your 1998 car to have an engine from a V6, then it would be easiest for you to pick a car of the same age as a donor. Otherwise, you would have to replace pretty much ALL of the wiring and running gear.
In any case, you'll need more than the engine/ECU/gearbox package.
- Remember that the V6 has variable power steering - you would need to take across the steering rack and power steering pump.
- The V6 also has uprated Brembo 4-pot brake calipers and larger discs/pads. You would need to take across the brake lines, brake servo, master cylinder, and ABS pump. Much later models of V6 did away with the Brembo setup (presumably when Peugeot started getting into financial difficulties, around mid-2003), so you could probably get away without taking those across.
- The V6 has a larger radiator and different pipework for the rad. Probably different coolant temperature sensors, too.
- It also came with a top-mount strut brace as standard in order to reduce the impact of having such a large and heavy engine installed up-front. This is the easiest part to take over, but remember to get the bolts along with it (they are longer than those in your 2.0).
Essentially, you'll want to have everything from the engine bay. It'll be cheaper to buy a running-but-tatty V6 and fix everything that's wrong with it.
dqwill said:
Hi, I am planning to do a conversion of my 1998 Peugeot 406 Coupe 2.0L 16v 135bhp to a 3.0L V6 VVT from another Peugeot 406 Coupe, so would like to get some information from you as to what i may need from the seller
Wouldnt it be easier to just swap the 406 you have for a v6 car? engine swaps only make sense if you go for something not standard. Vitorio said:
dqwill said:
Hi, I am planning to do a conversion of my 1998 Peugeot 406 Coupe 2.0L 16v 135bhp to a 3.0L V6 VVT from another Peugeot 406 Coupe, so would like to get some information from you as to what i may need from the seller
Wouldnt it be easier to just swap the 406 you have for a v6 car? engine swaps only make sense if you go for something not standard. 
No point building a car which the manufacturer made themselves.
V8mate said:
No point building a car which the manufacturer made themselves.
dqwill said:
Thanks all, appreciate the feedback, guess its much better to love the ol 2.0, lol.
If you're not on it already, the 406 Coupe Club forums are an excellent resource for owners.http://www.406coupeclub.org/PHPBB3/
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