Diesel Tuning

Gavin1 · Post by **Gavin1** » 01 Apr 2003, 14:17

Does anyone know of any links to info about tuning the citroen diesel engines. I'm looking for info beyond just inceasing fuelling and boost pressure. Looking for info on gas flowing the exhaust - lowering the compression ratio a little and changing to a larger turbo.
Cheers Gavin

Post by **RichardW** » 01 Apr 2003, 15:16

Gavin,
There's a guy Stefan that posts on the Q&A forum from time to time that has modified his BX TD quite a lot (more boost, timing, injectors, camshaft, bigger turbo, straight thru exhaust etc). I believe he is getting around 110 bhp now. Try sticking a post up there asking for a contact with him.
Richard

tomsheppard · Post by **tomsheppard** » 01 Apr 2003, 15:31

Although you can tune diesels, it is of academic interest because the cost outweighs the benefits. Spending all that dosh for a measly 20 BHP doesn't seem such a good idea to me when there are cheap and readily available petrol engines that drop straight in with lots more power. Tuning makes diesels thirsty so economy is not a good excuse. The cost of specialist tuning parts must be ruinous, too. Just how much petrol can you buy for the money? Having poured cold water on the idea, Have you considered the HDI engine? It is young, grunty, frugal and not a difficult swap, I am told

NiSk · Post by **NiSk** » 05 Apr 2003, 00:28

Actually, you don't have to "tune" diesels to get great performance from them - just look at what VAG have done with their 1.9 TDI engine: it started life with 75 hp and now, in the Golf GTI TD, it has 180 hp - all from a 1.9 liter diesel engine, and it behaves itself at tick over and in traffic, and the fuel consumption make petrol-heads green with envy!
Im sure the same kind of performance must be available from PSA's HDI engine, given the right treatment.
//NiSk

jeremy · Post by **jeremy** » 05 Apr 2003, 04:15

You might be interested to look at the peugeot official website under development or something. I was looking there and there was a long article about their partnership with ford for the production of diesel engines. the 2 litre engine gets a mention and it looked as though this engine is supplied to ford in 136 bhp form with incredible torque and minimal emmissions. The secret may be injectors with 6 nozzles which are fired in pairs in sequence but I expect its a bit more complicated than changing injectors and providing a computer to fire them.
jeremy

Dave Burns · Post by **Dave Burns** » 05 Apr 2003, 04:34

Had a ride in the works managers new shape 2.0L td mondao a while back, huh bastard goes like hell fire right through its rev range, never been in a diesel with so much raw grunt, its nice but its a ford, so **** it.
Dave

blueboy2001 · Post by **blueboy2001** » 05 Apr 2003, 06:22

As far as I'm aware, the VAG PD diesel engines in the GT TDI range are available in 130 and 150BHP forms. A couple of colleagues have them, and the 150BHP version is quick, but gets a little ragged at high revs.
Citroen's highest powered HDi engined car is the 2.2, with 136BHP on tap, but this engine has more torque than the 3.0 V6 petrol. As I wrote in my C5 review, it pulls from idle right up to 4500rpm and once its moving the in gear performance is fantastic. I spoke to a firm called Van Aaken Developments who told me with a piggy-back ECU they supply the engine will run around 170BHP and 320ft/lb of torque, and on the C5 with no smoking due to the particulate filter.
Ford's TDCI engine is 130BHP stock. Citroen have recently annouced they have a 1.6HDi engine with 110BHP on tap, which leads me to think a power upgrade on the 2.0 and 2.2 models will be happening sometime as these are current 90 or 110BHP. The 1.4HDi 16v engine has 92BHP, so the 2.0HDi 90 now look a bit behind the times.

jeremy · Post by **jeremy** » 05 Apr 2003, 07:03

Dave - I think you may have recognised the next engine for the Citroen range. If you follow the link and then select the press pack (an acrobat document) you will find some very interesting data on new PSA engines and the partnership with Ford. It seems that Ford have got first bite of this one but the reason may be that its output is so similar to the 2.2 litre diesel which Citroen are using in the C5. It may be that this 2 litre is intended for a mk 2 version.
jeremy
http://www.psa-peugeot-citroen.com/en/night.php

jeremy · Post by **jeremy** » 05 Apr 2003, 07:05

Should have said select 'technology' from first menu
jeremy

vanny · Post by **vanny** » 06 Apr 2003, 03:01

Are there not simple things that can be done?
One of the key things about diesels seems to be the through flow of air. Would a performance air filter not help in increasing both power and efficiency allowing more air in, and more power on combustion? Still using the same amount of diesel but for more power?
Im currently experimenting with a forced air intake with a bumper scoop into a pre-airbox then to the filter. This is one the grounds that the air will be colder (instead of being tapped off the radiator!!), and under higher pressure dependant on speed (with much of the air heading towards the standard intake going through the radiator instead). It seems to have more pull in mid rev range in 5th, taking up some of the lag when putting foot down from 50 to 80. Dont know if it has made any difference to economy as the engine is totally goosed anyway. Think ill try removing the middle silencer next and see how that affects the uptake. Just a bit mis leading when running on three cylinders and bare to minimum oil (anything above 1/4 full and it gets spat out the back).
On the other stuff, does that mean the HDi 16v lump is pretty wet? Had one in a tester C3, and other than the 'blink-and-miss-it' glow plug light it seemed pretty swift.
Anybody else heard of the Vauxhaul prototype EcoDiesel engine that they have in a race car. Something along the lines of a 1.3litre 130 BHP 115 top speed with a fuel economy of 140MPG, think it would do very well in a lemans situation, refuel once during the race would be clever

NiSk · Post by **NiSk** » 06 Apr 2003, 12:34

Hi Vanny,
If you are interested in diesels and PSA diesels in particular, you should read the info at the following web sight - it's pretty complete and explains a lot of the reasons why diesles can be made to go faster (and why some of them can't!)
http://www.tramontana.co.hu/citroen/engine/diesel.html
//NiSk

Dave Burns · Post by **Dave Burns** » 06 Apr 2003, 17:02

Interesting reading, yet another Ford with French diesel know how, after all the crummy diesel engines ford have come along with its no real surprise that someone else has to tell them how its done

)
Dave

vanny · Post by **vanny** » 06 Apr 2003, 17:42

Dont even get me started on Ford Diesel engines. Had to work on a 1.8TD a week back. Now this thing has a PSA head so is very similar to my own block, yet ford manage to turn it into the most useless bit of kit in the world. It has a Lucas pump for a start, but then you loo at the piping, and with the fuel filter totally untouchable not to mention higher than the pump, you havae to wonder what Ford wwhere thinking of. I was only meant to be diagnosing the problem (3 dead glow plugs!), but the guy changed the plugs and couldnt get it started. Had had a new alternator and starter with in the last month (damn powerfull starter as well!). Turns out the pump was air locked, as was the fuel filter, and i imagine other places as well.
How can a company take a proven engine an make such a mess.
Am i right in thinking that Mercedes are now using the PSA diesel designs?