GET IN THERE 42.5 mpg in a LCR

paradigm · 17 Jun 2008 at 10:27

Simon said:
Eh? Want a go at what exactly? Driving an LCR to achieve the best possible MPG - no thanks it might sludge up on me. Dont tell me you have got upset at another one of my posts.

Not annoyed, confused.

Replace "Easily" with "Attainable", and I'd agree. But there is nothing "Easy" about getting over 40MPG on the 225PS 1.8T. The 150PS, sure, but not the 225.

Toker · 17 Jun 2008 at 10:27

even the polo gti has a quoted 39.6mpg extra-urban figure (and you know how you rarely meet the quoted figures) and it is a ~1150kg 1.8 20VT 150 so getting over 40mpg in a ~1350kg 1.8 20VT 225 is quite impressive

Simon · 17 Jun 2008 at 10:29

paradigm said:
Not annoyed, confused.

Replace "Easily" with "Attainable", and I'd agree. But there is nothing "Easy" about getting over 40MPG on the 225PS 1.8T. The 150PS, sure, but not the 225.

At 70mph I would think it was easy. I used to get it in my 280PS 2.0T if I sat at 70mph forever. I even managed 35mpg in my S2000 on a trip to Manchester from Reading.

However it was VERY boring.

Scottland · 17 Jun 2008 at 10:29

paradigm said:
Yep. can't usually get over 30 in my dads Cooper S no matter how hard you try.

Old or new? The one I've had for the past week has managed over 30 (average) but booting it yields teens

paradigm · 17 Jun 2008 at 10:30

Simon said:
At 70mph I would think it was easy. I used to get it in my 280PS 2.0T if I sat at 70mph forever. I even managed 35mpg in my S2000 on a trip to Manchester from Reading.

However it was VERY boring.

You would think it was, and I agree, it probably should be, but in reality, its just not.

Like I said, the 150PS is a lot more economical when cruising than the 210/225PS lump. What attributes to this I'm not so sure.

Yes, it is boring trying to attain a decent MPG in either

Scottland said:
Old or new? The one I've had for the past week has managed over 30 (average) but booting it yields teens

55 plate

Simon · 17 Jun 2008 at 10:31

paradigm said:
Like I said, the 150PS is a lot more economical when cruising than the 210/225PS lump. What attributes to this I'm not so sure.

55 plate

Mainly the smaller turbo I would imagine.

Toker · 17 Jun 2008 at 10:32

yea k03s turbo

paradigm · 17 Jun 2008 at 10:32

Toker said:
yea k03s turbo

K03 on the 150PS. K03s on the 180.

Bear · 17 Jun 2008 at 10:33

cymatty said:
I have never seen 25mpg+

I dont think Ive ever seen better than 27mpg on mine

Firestar_3x · 17 Jun 2008 at 10:33

Nope K03

The 170PS is the K03s

Edit : As Above..

Jonnycoupe · 17 Jun 2008 at 10:36

Firestar_3x said:
On a side note the turbo is only spooled when accelerating, during motorway cruising conditions unless you put your foot down the turbo isn't spooled / producing boost.

Your definition of spooled doesnt really hold. You dont need boost for a turbo to be shifting air and raising MAP.

Hence the whole topic of a smaller turboed identical engine giving better MPG.

Toker · 17 Jun 2008 at 10:38

oh yea forgot these are older cars

new 1.8t cars with 150ps come with the k03s

Firestar_3x · 17 Jun 2008 at 10:43

Jonnycoupe said:
Your definition of spooled doesnt really hold. You dont need boost for a turbo to be shifting air and raising MAP.

Hence the whole topic of a smaller turboed identical engine giving better MPG.

Ok then, the turbine will still be turning due to the exhaust gasses passing, however the wastegate on the turbo will be fully open not allowing any boosted air into the intake on cruise.

I will simply stating the fact that when at any stable speed the turbo isn't forcing any air into the intake.

Or thats the story the boost gauge on my 1.8T tells me anyways.

Jonnycoupe · 17 Jun 2008 at 10:48

Firestar_3x said:
Ok then, the turbine will still be turning due to the exhaust gasses passing, however the wastegate on the turbo will be fully open not allowing any boosted air into the intake on cruise.

I will simply stating the fact that when at any stable speed the turbo isn't forcing any air into the intake.

Or thats the story the boost gauge on my 1.8T tells me anyways.

Its does help air flow though.

How can the wastegate be fully open when its controlled by a pneumatic-mech actuator that is actuated by the intake manifold being pressurised to open it and limit boost.

Its closed, you get zero turbine bypass, shaft torque then churns a fair amount of air into the intake and reliveses some of the cylinder demands from the downstroke of the piston, hence reduced pumping losses = higher efficiency.

Firestar_3x · 17 Jun 2008 at 10:53

Yea i'm having a slow day, the wastegate is closed and controled by the N75 depending on intake pressure level.

Jonnycoupe · 17 Jun 2008 at 10:55

Its not as straight forward as that, the actuator controls it. the N75 is just a ECU control bleed valve used to reduce the sensing line pressure so the actuator opens later. N75 determines the intake pressure.

Firestar_3x · 17 Jun 2008 at 11:01

Jonnycoupe said:
Its not as straight forward as that, the actuator controls it. the N75 is just a ECU control bleed valve used to reduce the sensing line pressure so the actuator opens later. N75 determines the intake pressure.

Didn't think the N75 directly determines the intake pressure i thought it was a basic solanoid valve and the thrust / map sensor ontop of the intercooler measures intake presure, unless thats only present to measure boost drop? The N75 is mearly an automated bleed valve oftern bypassed / allowed to see a maximum psi by an MBC?

233 · 17 Jun 2008 at 11:06

Normal service is resumed,

Took wifey to work this morning as i'm doing the brakes on the lcr today

16mpg on a 20 mile round trip

lordrobs · 17 Jun 2008 at 11:08

Foxtrot26 said:
Normal service is resumed,

Took wifey to work this morning as i'm doing the brakes on the lcr today 16mpg on a 20 mile round trip

I'm guessing all of these figures are from the trip computer?

Have you ever worked out the economy manually, and if so what did it come out at?

paradigm · 17 Jun 2008 at 11:10

lordrobs said:
I'm guessing all of these figures are from the trip computer?

Have you ever worked out the economy manually, and if so what did it come out at?

I've worked out mine manually before, there is usually about +/-1-2MPG in it, it fluctuates both ways.