Bhp Improvement

[philb]

Just had my 2.2 HDI C5 "superchiped" and replaced the exhaust and Cat with a custom made one with sports cat. The BHP improvement is staggering: from 131BHP on the dyno to a whopping 182 BHP. A huge differance and makes the car far better to drive.

 

Don't use one of those tuning boxes, the one I used (market leader :angry: ) dumped all the extra horses in one go, not good at all unless you like clutch slip. Go for a proper re-map and get the turbo pressure increased also.

 

Next up-rate the injectors that should be a few more horses!!

[Guest stephendrak01]

Increasing the boost pressure from standard (by ANY degree) will reduce turbo charger operating life. increases the temperatures within the engine & places extra stresses on the engine components, clutch, transmission & final drive components. Basically increasing boost pressure is highly effective but a very savage way of increasing the power output of an engine.

 

taken from http://www.dieselbob.co.uk/tuningmethods_plus.shtml

 

intrseting read if your intrested in modding a diesel, could i ask where or who did your remap?

[philb]

intrseting read if your intrested in modding a diesel, could i ask where or who did your remap?

 

 

 

Superchips in Buckingham for the re-map and Powerflow for the custom exhaust they build it on the car as there are no aftermarket direct replacements, even got to choose the exhaust note!!! A couple of sessions before and after on a rolling road to gauge power increase. you can loose power if exhaust is not correctly made.

 

A larger capacity exhaust goes some way to increasing the efficicency of the removal of the hot gasses from the engine.

 

I was going to look at having 2 turbo's like the new C5, but the cost was stupid.

 

These mods are because my last car a Subaru lagacy 2.5 twin turbo was so much fun but at 15 to 20 MPG, insurance group 19, stupid running costs it had to go for a more sensible car, sensible is so slow though!!

[Guest Ray]

Thats a huge jump from 131 to 182 bhp !!

Is your car the manual or auto ,and has your mpg took a drop for the increase in power ?

Roughly how much was the mod ?

cheers

Ray ..

[Atitudejim]

on my c5 2.0hdi Sx after a bmc-cda + remap is runing on 135bhp.... diconnecting the egr + decating it... would probably help reach 140.. for a car thats already got 100.000 miles runs pretty good . Recently on a trip i done... i met a c5 2.2vtr on motorway.. same top end.. acceleration i was a bit stronger... note that both estates...

 

few mods make the 2.0 run aside the 2.2 hdi .. not bad

[dalex]

on my c5 2.0hdi Sx after a bmc-cda + remap is runing on 135bhp.... diconnecting the egr + decating it... would probably help reach 140.. for a car thats already got 100.000 miles runs pretty good . Recently on a trip i done... i met a c5 2.2vtr on motorway.. same top end.. acceleration i was a bit stronger... note that both estates...

 

few mods make the 2.0 run aside the 2.2 hdi .. not bad

 

 

Hi Jim

Who did your re-map for you and was your 2.0 a 110 to start with.

Has this extra been confirmed by a rolling road or is it estimated?

My brother got his 110 re-mapped to 135-140 ( that was their claim ???) and was very pleased.

He towed a caravan and it effectively made for a gear difference when towing (5th on routes where he had to used 4th previously) and a much smoother drive altogether

I'm hoping to get my 54-110 VTR estate before the towing season and am looking for as much info as possible beforehand

Dalex

[Ronin]

Increasing the boost pressure from standard (by ANY degree) will reduce turbo charger operating life. increases the temperatures within the engine & places extra stresses on the engine components, clutch, transmission & final drive components. Basically increasing boost pressure is highly effective but a very savage way of increasing the power output of an engine.

 

taken from http://www.dieselbob.co.uk/tuningmethods_plus.shtml

 

intrseting read if your intrested in modding a diesel, could i ask where or who did your remap?

 

I'm afraid I have to disagree here with this comment:

"Increasing the boost pressure from standard (by ANY degree) will reduce turbo charger operating life."

 

Boost pressure doesn't cause any kind of wear on the turbo itself. The turbo is a dual impellor device on a central shaft bearing hub and can spin quite freely up to and beyon 200,000 rpm (something that a diesel will not achieve even at maximum boost settings... Turbo technics ran a T2.5 turbo on a pug 406 td at 18psi which kicked out 220 bhp/ 265ftlbs torque quite reliably as a test bed "demo" for 100, 000 miles.

 

The main cause of turbo failure is oil starvation which in turn is caused by blocked or clogged oil channels lubricating the main shaft and bearing. This is the symptom of heat soak which more often than not is due to stopping the engine too soon after hard driving and not giving the turbo a chance to wind down to idle speed (ever notice on a turbo driven car the gentle whine that eventually stops after you have turned the engine off? Thats the damage happening right there and given the amount of times we have all listened to that familiar sound it then becomes no surprise to have many turbo failures.

 

A lot of owners blame boost pressure for premature turbo failure when its the actual fact that if the boost is increased, the more inclined we will be to drive the car harder thus the turbo revolutions will be used more often and then turn off immediately without thinking of winding it down first.

Most turbo manufacturers recommend a "wind down period" of 5 minutes but 2 minutes is often sufficient. A good quality oil is vital for uprated boost pressure and can prevent the clogging

 

Although I have to agree that because we tend to drive harder with an uprated boost i.e. dropping a gear to get the boost pressure up for overtaking etc. which puts undue pressure on the bearing and shaft that can lead to eventual failure. I also totally agree that other engine mechanicals should be uprated to take the extra boost in the first place and just adjusting the pressure is asking for trouble. A BRAKE UPGRADE IS A MUST!

It is more down to lack of driver education than a mechanical device such as the turbo that is over engineered by design to take up these demands on its usage.

 

Bare in mind that only a few type/ model number turbochargers are often used on many, many different cars and don't need any modification to them to run different boost pressures to suit everything from humble turbo deisels with mild boost to thunderous rally cars for the road with massive boost. The only difference is many applications are the actuator spring loads and of course the flanges.

[Randombloke]

I'm afraid I have to disagree here with this comment:

"Increasing the boost pressure from standard (by ANY degree) will reduce turbo charger operating life."

 

Boost pressure doesn't cause any kind of wear on the turbo itself. The turbo is a dual impellor device on a central shaft bearing hub and can spin quite freely up to and beyon 200,000 rpm (something that a diesel will not achieve even at maximum boost settings... Turbo technics ran a T2.5 turbo on a pug 406 td at 18psi which kicked out 220 bhp/ 265ftlbs torque quite reliably as a test bed "demo" for 100, 000 miles.

 

Running the turbo with more boost pressure means more power from the engine, and the higher pressures on the inlet side mean the turbo will run hotter. The engine will generate more heat as a by product of the extra power.

 

This means more ear on all engine parts, not just the turbo. Hotter running temperatures mean the oil loses viscous qualities quicker, and then cannot lubricate or cool the turbo as efficiently.

 

If the rise in boost goes with uprated cooling (both for oil and water), and better oil, and the turbo is run down properly, then the turbo will probably out last the overstressed engine it is force feeding.

 

In practice, I think not. The higher pressures and temperatures, combined with a lack of the facilities to cope with these means either the engine or its turbo will croak prematurely.

 

Turbo Technics probably used the best oil available.

[Ronin]

Iirc it was Mobil one 0w/50w they also recommended and a 16 vein, 1.5 ltr capacity oil cooler in front of the main radiator, and a oil change period of 6000 mile for that spec.

I had a test drive of what they called the "Beastie Pug" when I was enquiring about a full TT conversion for my Pug 205 gti. It literally scared the crap out of me that an oil burner can out drag anything at the lights and overtake so quickly in 5th without so much as a complaint "trucks , buses etc were dispatched in a matter of a couple of seconds from pulling out to pulling back in. I mean, i'm used to turbo cars like scoobies etc. but this was a different beast altogether.. :blink: