sri turbo pretty bad on fuel

[jason1987]

are they all bad? parkers say 28mpg lmao, my bmw e26 323 was ment to be 30mpg, but my 406 seems just as bad if not worse, which isnt fair as the bmw had performance aswell lol, so this fuel is wasted on my 406, i can only get around 50 or so miles on £10 these days, this about normal?

[Welly]

They are quite thirsty for a 150bhp car. Around town you'll get 18-23mpg and on a run maybe 32-36mpg I think. Mjb on here used to get massive mpg from his by tailgating lorries on the M6 for miles on end at 55mph but I think that's the only way you'll get good mpg.

It's a shame they are thirsty and I believe they 'dump' fuel on the overrun to cool the combustion chambers (like Japanese cars) left standard they will go on forever though......

The other shame is that the V6 is comparable to the 2.0T in terms of mpg

[mjb]

They are quite thirsty for a 150bhp car. Around town you'll get 18-23mpg and on a run maybe 32-36mpg I think. Mjb on here used to get massive mpg from his by tailgating lorries on the M6 for miles on end at 55mph but I think that's the only way you'll get good mpg.

I got 55-60mpg by slipstreaming (not "tailgating"... ) trucks on my way to Manchester every day, but the urban parts of the drive brought the economy down to 34.6mpg in normal traffic conditions (I drove extremely consistently...)

Driving around here every day (VERY hilly) I got around 14mpg The thing guzzles petrol when the turbo's boosting

It's a shame they are thirsty and I believe they 'dump' fuel on the overrun to cool the combustion chambers (like Japanese cars) left standard they will go on forever though......

No, that's the ES9J4 V6 with a cold engine, which does it to warm up the cat or something

The other shame is that the V6 is comparable to the 2.0T in terms of mpg

The V6 is a lot more economical in town, but not quite as good eco-driving on the motorways at around 45-55mpg. It is however more economic at higher speeds, as at 65-90mph the tubby gets about 22-28mpg and the V6 is knocking about 34mpg. The tubby is doing about 8-12mpg at 120mph whereas you've got to hit over 150mph to drink that much fuel in the V6

It's a shame because I *adore* the tubby engine. It's so relaxed and effortless...

[Welly]

A hot turbo-charged engine needs a degree of in-cylinder cooling and believe it or not the quickest way to cool the valves and piston tops is to 'dump' a bit of fuel in there whilst over-running (this is what you see exagerated on race cars with flames from the eggsauce when lifting off).

[mjb]

Aye, but the tubby's a low compression engine with only 150bhp, so it really doesn't get as hot as the more aggressively turbocharged cars

Besides, you get a nice quiet 99.9mpg on over-run (D8 trip computer maximum) whereas the V6 will give around 65mpg and start backfiring when cold at 40mph, so I'm pretty sure there's no fuel being dumped on the tubby

[eoin27]

Will you describe slip streaming trucks Matt please

[Welly]

Aye, but the tubby's a low compression engine with only 150bhp, so it really doesn't get as hot as the more aggressively turbocharged cars

Besides, you get a nice quiet 99.9mpg on over-run (D8 trip computer maximum) whereas the V6 will give around 65mpg and start backfiring when cold at 40mph, so I'm pretty sure there's no fuel being dumped on the tubby

S'pose the tubby's just crap on fuel then to be fair when it was designed no-one really gave a crap about fuel economy did they

[eoin27]

Its amazing in comparision to the old 2.0 Turbo, the new 1.6 200bhp Turbo Peugeot engine will return 42mpg!!! MPG matters now though and so does more power!

[Welly]

Manufacturers are downsizing (there's a word we're all sick of) engines in favour of smaller turbo'd units. A 2.0 non turbo will be thirsty most of the time whereas a 1.6 turbo will be thirsty only 'on boost' and at all other times will behave like a smaller unit and return good mpg's (unless I'm driving it ).

I like the lazy nature of a larger capacity engine though and can't help but feel sorry for these new wheezy over-stressed engines which, apparently, can be dog rough and harsh.

[jason1987]

so why does it drink so much? its only an 8v low pressure turbo

[eoin27]

I think the main answer here is that the old XU pug engines werent tuned for good fuel economy.

[jason1987]

i reckon an evo or scooby isnt much worse then an sri on fuel