Mopar Muscle Association UK

Best economy on full throttle is at peak torque
Is peak torque/best economy at the same revs on 1/2 or 1/4 throttle?
You dont want to be flooring it down the motorway...not for economy anyway

Mine seems to get the best MPG about 4000/4200 on the motorway
which is still appauling around 6/7 mpg
Who cares

Hi Folks,

Now that is a good question?

I would suppose on a four barrel vac secondary, that would be just before the secondaries open, which is approx. 40percent throttle???
But thereagain a spreadbore may be different, much smaller primaries?

Whats the best anyones got out of a B/B?
My 383 Cuda was 17mpg on the freeway!!!

My 440 iron head racecar was less than one on the strip!!!

Baccy.

I used to get 17/18mpg outta my 440+4, taking it easy.

My bitty 318 with 4.10s and a 31" tyre does around 20mpg at about 65-70mph on the Motorway. Better than me JEEP!

Tall stories Kev,

How do you get that motor to run on Red Diesel anyway???

Baccy.

Jon wrote:Best economy on full throttle is at peak torque
Is peak torque/best economy at the same revs on 1/2 or 1/4 throttle?

Makes no difference. It is when your engine is being as efficient as possible. Hence the fact it is making the most torque. On a hopped up street/strip engine this could be anywhere between 3000 and 5000rpm.

On my car it is about 4000-4500rpm. I get much better economy at 90mph than I do at 70.

Hi Dave,

Thats well interesting.

We tend to build our cars for best mpg at around 70mph, mainly because we have speed cameras every 100metres down South.

I assume the speed limit must be different up North, or do you just not bother to pay the fines???

Only pullin ya leg!!! Most of these Sothern Softee mobiles won't do 90mph flat out?

Keep up the good work Baccy.

Speed doesn't seem to make much difference to my economy, 12mpg whatever I do...flat torque curve?
I'm just not sure that'd work on a tall geared car, just because the engine is at its most efficient doesn't mean everything else is ideal(wind resitance etc), and if you're burbling along at 70 mph at just off idle and hardly any throttle like some of the yanks I've been in I cant see dropping to second to get it up to peak torque as being the best economy tip

My 20mpg comes with just feathering the doubledumper at around 70, mpg improved greatly with the doubledumper!

You don't have to Bananarama! believe me. If you can't get your Bananarama! head around it then just Bananarama! off and do what you want. It's not my Bananarama! money.

It isn't at exactly peak torque anyway. I lied. But it is near enough as damn it. And peak torque is easier to find. So Bananarama! off you Bananarama!.

Sorry. Just been watching "Sexy Beast" and I'm still in character.
I am always like that after watching a good film closely.

That Ben Kingsley was good in it.

Scary Bloke ! (Ben Kingsley, not you, Dave! )

Double pumpers you gotta love em
Just the best when you jump on the Loud pedal
When everything is set up just right off course

Dave, you said
'You also want to make sure you are above the stall speed of the converter. '
Is that because at just off idle the carb isthrowing in fuel that isnt being used efficiently, whereas dropping a gear and running at say, 3,000 rpm (peak torque for instance) is better?
It makes sense to me in that my plugs are much sootier after growling around town at low revs than they are after a thrash up the motorway, strip etc..

ps Dont answer if you are still in 'Sexy Beast' mode

Bananarama! off you Bananarama!.

Nope. It's still with me.