406oc.co.uk

Hi, I hav 406 sri turbo, want to do the following-

*induction kit
* raise boost, wats safe psi with out blowin motor ?
* turbo back exhaust, lookin 2.5" diameter pipe work turbo back, what best "diameter ?
* remap/ chip

Can any 1 tel me wat kind of gains i'll see bhp/tq wise.

The engine can take quite a bit of boost without blowing up. As long as you replace the turbo, pistons, canshaft...

The turbo won't last more than a couple of months even with just minor extra boost

so wud i need a hybrid turbo? wat bout the pistons wats max boost they can handle? Ive read alot of people mention raisin boost to 12psi why 12?

I had a Citroen Xantia Activa Turbo (XU10J2TE) for 2 years, (Same engine as the Peugeot 406 SRI ) I had it running 18psi peak boost (Low RPM) and a steady 14.3PSI (High RPM) just by using a boost Valve and a boost gauge to install. Put it on a rolling road and i got 198BHP at the wheels, cant remember the torque figure off the top of my head.

I never got any trouble from the TB25 unit or the lump the only draw back to all the power is the water temp gets very HOT very quickly and you lose power at around 5BHP per 10 Degrees. If you were to go down the path of getting the Boost Valve I recomend a large Intercooler . Also fit a decent Induction kit, etc.

I only got shot of my Xantia becuase of the Active Suspension was costing me a fortune to maintain . So now I got myself a 406 executive turbo in its place and I will boosting it up to 198BHP again. Here is some info for you bellow on the XU10J2TE.

The engine its self was well proven and over-engineered to a degree.

It was designed as a low blow installation not an all out powerhouse but in doing so, alot of safety was added in. How else can you explain the 8-1 compression ratio which is very low by modern standards for a turbocharged car.

The car was never designed to compete with high performance rivals, remember the engine was also used in the XM etc, it gave smooth power and a very flat torque curve, in keeping with the character of the car, and it only ran 9psi which is low.

If they designed the internals to be at the limit, many hard driven cars would have been back for warranty claims with popped head gaskets and holed pistons.

Another example of an engine that runs in a low-power application, the VAG 150bhp 1.8 T lump. Deliberatly detuned although in this case, more with ECU mapping than a small turbo. 200bhp for 200 quids worth of remap, they also did a 225bhp lump in the TT which was essentially the same engine with a bigger turbo.

Finally, the 1 bar limit on the ECU is there to stop people playing around with bleed valves Its just an industry standard level that in the event of something failing like the boost control solonoid or actuator pipe coming off, the engine wouldnt blow itself up when it hits 30psi.

Hope this helps

Hello! I have same kind of peugeot 2.0 turbo as yours, for over 5 years/85 000 kilometres. I run 14,5-15 psi peak boost at low rpm, and 12,5-13 psi steady boost at high rpm. Boost is set with manual boost control valve (turbosmart) for over 2 years/38tkm now without any problems. Engine works perfectly. Original intercooler is changed to full aluminium aftermarket one size of 550x260x76mm (boost pipes 2,5"). Engine output was 184hp/308nm with original cooler, havent measured again with better intercooling.

lynneandcrow wrote:the only draw back to all the power is the water temp gets very HOT very quickly and you lose power at around 5BHP per 10 Degrees

That's because it's running lean and overheating

What size of Alloys and Tyres are they cos ive got a set of TSdubs from my Xantia there 17s but the tyres are too low a profile and they look dumb

You'll need to get some 225/45's for the 17's. That should keep your rolling radius more or less correct.

I use 8x18 chrome alloys (et 18) with 225/40 tyres and koni 1150-5040 ride height-adjustable coilovers.

My water temperature is always normal (80c), never had promlems for overheating. In fact its very rare that my cooling fans blows, even summertime. Sorry about my bad english...

hi guys,

im new to this forum and owning a 406.
ive managed to get my hands on a 96 sri turbo, 50,000 miles, 2 owners, ive known the car from new and it cost me the princely sum of £350.

ive been looking at playing with the boost, i have fitted a boost guage and am currently looking at increasing the boost slightly. you mention the ECU having a limit on it at 1 bar, now i dont want to go over that but would it interfere with the boost etc if i fit a bleed valve and run somewhere near the 1 bar point? is there a way of disabling the the sensor for it? how is it activated?

any help would be grateful

cheers

shrek84 wrote:now i dont want to go over that but would it interfere with the boost etc if i fit a bleed valve and run somewhere near the 1 bar point? is there a way of disabling the the sensor for it?

If the ECU doesn't know how much air is getting into the cylinders, it won't know how much fuel to put in.

"Boost" isn't some magic technology or an ECU algorithm, it's just compressed air...

lynneandcrow wrote:I had a Citroen Xantia Activa Turbo (XU10J2TE) for 2 years, (Same engine as the Peugeot 406 SRI ) I had it running 18psi peak boost (Low RPM) and a steady 14.3PSI (High RPM) just by using a boost Valve and a boost gauge to install. Put it on a rolling road and i got 198BHP at the wheels, cant remember the torque figure off the top of my head.

I never got any trouble from the TB25 unit or the lump the only draw back to all the power is the water temp gets very HOT very quickly and you lose power at around 5BHP per 10 Degrees. If you were to go down the path of getting the Boost Valve I recomend a large Intercooler . Also fit a decent Induction kit, etc.

I only got shot of my Xantia becuase of the Active Suspension was costing me a fortune to maintain . So now I got myself a 406 executive turbo in its place and I will boosting it up to 198BHP again. Here is some info for you bellow on the XU10J2TE.

The engine its self was well proven and over-engineered to a degree.

It was designed as a low blow installation not an all out powerhouse but in doing so, alot of safety was added in. How else can you explain the 8-1 compression ratio which is very low by modern standards for a turbocharged car.

The car was never designed to compete with high performance rivals, remember the engine was also used in the XM etc, it gave smooth power and a very flat torque curve, in keeping with the character of the car, and it only ran 9psi which is low.

If they designed the internals to be at the limit, many hard driven cars would have been back for warranty claims with popped head gaskets and holed pistons.

Another example of an engine that runs in a low-power application, the VAG 150bhp 1.8 T lump. Deliberatly detuned although in this case, more with ECU mapping than a small turbo. 200bhp for 200 quids worth of remap, they also did a 225bhp lump in the TT which was essentially the same engine with a bigger turbo.

Finally, the 1 bar limit on the ECU is there to stop people playing around with bleed valves Its just an industry standard level that in the event of something failing like the boost control solonoid or actuator pipe coming off, the engine wouldnt blow itself up when it hits 30psi.

Hope this helps

Nice copy and paste

Original post -

http://www.frenchcarforum.co.uk/forum/v ... 63&start=0

One of the 205 gti's thats been fitted with this engine is running at around 250 bhp with standard internals, its got ARP studs instead of headbolts, Cometic headgasket and VEMS management as well as having custom manifold and exhaust
(see 205gtidrivers.com) so i guess that means that the pistons and rods etc are up to taking quite a lot of punishment.

daviewonder wrote:One of the 205 gti's thats been fitted with this engine is running at around 250 bhp with standard internals, its got ARP studs instead of headbolts, Cometic headgasket and VEMS management as well as having custom manifold and exhaust
(see 205gtidrivers.com) so i guess that means that the pistons and rods etc are up to taking quite a lot of punishment.

There is no reason why they wont take the power. Owner abuse and lack of understanding is what kills them.