just wondering: have got fiat stilo 1.9jtd producing 115bhp. the same engine is fitted into saab 1.9tid and produces 150bhp, how do they get the difference.
More boost, more fuel!
And they swapped the J for an I.
Actually, in VW speak, the Pompe Duse system gave the TDIs a lot more poke, Instead of having a central fuel pump, they have one little one on top of
each injector.
It works like this:
Diesels use frickin high fuel pressure (five thousand PSI not uncommon), and use this pulsed pressure to open mechanical injectors (basically sprung
valves with a shaped tip!). If you have a length of pipe between the fuel pump and the injector, it swells a little under the high pressure pulse, and
hence the injector opens a tiny bit slower, The injector wont give a good atomisation until its fully open, hence PD cuts down on the length of high
pressure pipe to almost zero, and hence gets a really snapy injector response. RESULT: more eficient fuel burn, and more grunt.
But more boost helps too!
Ed.
[Edited on 8/12/06 by ed_crouch]
.......... or you could chip it
I run a Citreon Xsara 2ltr hdi, which normaly produces 110 bhp. Purchased a chip from Dragon, on ebay, engine now puts out 143 bhp, (on rolling road).
Not a bad increase for £160, which was my bid. The best part though is that it used to do 47 mpg, now does 54 Ray
quote:
Originally posted by ed_crouch
Diesels use frickin high fuel pressure (five thousand PSI not uncommon), Ed.
[Edited on 8/12/06 by ed_crouch]
I had a 150bhp sabb for a hire car. Thats a great engine and goes like stink, But the fuel consumption is shite.... I was averaging 38 when driving
normally(not thrashing).
A chip should up yours nicely,,, Im looking at chipping my tdi passat which ups it from 110 to 143 199 quid and is supposed to make it better on
fuel too.
Diesel engines are basically controlled by how much fuel is pumped in. To get the lower power models they chuck in less fuel on the TDi engines (probably an over simplification). So my ancient 90 TDi is now a 110TDi as my chip just puts more fuel in. I believe the economy comes from not needing to rev the engine so much to accelerate. On my Audi the peak power is at 4200RPM but peak torque is at 1800RPM so I keep the engine around there. I certaily don't feel the need to go above 3000RPM as torque realy starts to fall away. I went from 43mpg to 48mpg commuting or 50+mpg on the motorway.
So, I've got a bloody Renault Espace 2.2 diesel - does on average 26mpg - terrible - and it's only 2 years old.
Are this chippable?
It's also got terrible turbo lag - verging on the dangerous when pulling out.
Hi,
1800 bar is the norm for a modern HDI engine!
Thats why the injectors are £400 each when they go wrong.
Davidwag
Pity the poor bugger whos got a V10 TDI VW taureg. £4000 in injectors!!!
Serve them right for owning a big lump of chelsea tractor twattery!
**Runs and hides whilst the offended digs out the flamethrower**
Jasper, some chips listed here for the 2.2 espace.
http://www.tunit.co.uk/vehicles-supported.php?reference=Renault&shoppingview=
Ned, looking at the prices on Tunit, (nearly £500) I think that Dragon are better, (nearly £400, but can be got cheaper (EBAY)). Plus power acheived is a bit better. Ray.
not saying that's the place to buy them, just it has a listing for an espace!