Electronic boost controllers & MPG
#1
Electronic boost controllers & MPG
Occasionally bemused at only getting 30 MPG @ 75 mph on long trips, and having a Dawes equivalent fitted to my MY99 turbo, if I fit an EBC and turn the boost right down for a long motorway journey:
1. Will I get more miles per gallon?
2. Would this hurt my engine?
Anyone tried it?
Cheers
Steve
1. Will I get more miles per gallon?
2. Would this hurt my engine?
Anyone tried it?
Cheers
Steve
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I have a HKS EVC5 fitted and got 27mpg on my trip to NBO (cruising 90++).
Will it hurt your engine - no!
Personally, I'd rejoice at 30mpg but if you bought a Scoob expecting any semblance of economy (in most circumstances) then you bought the wrong car.
Will it hurt your engine - no!
Personally, I'd rejoice at 30mpg but if you bought a Scoob expecting any semblance of economy (in most circumstances) then you bought the wrong car.
#6
I was never under any illusions about Impreza MPG, but as I age, and my mortgage goes up! I think about an Impreza with a 2 wheel drive, zero boost button, so I can cruise up to Scotland from the Midlands at 40MPG before blatting round the Highlands at 15MPG.
Is that too much to ask?
Is that too much to ask?
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#9
Hello Steve
Long time no speak.
30 mpg is indeed very good for a classic impreza turbo. On a 75mph cruise i getting much less than that.
Lowering the boost, will not IMHO do any harm at all, but with the MBC you control the boost by your right foot to a large extent. i.e. if you are cruising and not going much over '0' boost then lowering the boost etc will make no difference on cruising.
Kind regards
Iain
Long time no speak.
30 mpg is indeed very good for a classic impreza turbo. On a 75mph cruise i getting much less than that.
Lowering the boost, will not IMHO do any harm at all, but with the MBC you control the boost by your right foot to a large extent. i.e. if you are cruising and not going much over '0' boost then lowering the boost etc will make no difference on cruising.
Kind regards
Iain
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If you're not hammering it up to 75mph, turning the boost down isn't going to make much difference. Once you've got up to 75mph, you won't be using boost to sustain that speed, and will be using closed loop fuelling, controlled by feedback from your lambda sensor.
There are only 2 ways I can think of that might help. The first, and dearest, is an ECU remap. If you had a Tek3 you could specify you were more interested in economy than performance, and the mapper would happily map that way for you. The second is to use some sort of AFR controller (HKS AFR Type L for instance) to make your closed loop fuelling leaner. But I don't know whether that would have any implications when it switches over to open loop, for instance if you had to accelerate hard for some reason temporarily. Lean open loop fuelling in 5th gear at 75mph WOT doesn't bear thinking about...
As already mentioned above, 30mpg is a pretty healthy return.
Never gonna happen mate, not in a Scoob. Get yourself a diesel...
Yes it is! How many petrol fuelled 2 litre turbocharged cars do you know of that return more than 30mpg...?
There are only 2 ways I can think of that might help. The first, and dearest, is an ECU remap. If you had a Tek3 you could specify you were more interested in economy than performance, and the mapper would happily map that way for you. The second is to use some sort of AFR controller (HKS AFR Type L for instance) to make your closed loop fuelling leaner. But I don't know whether that would have any implications when it switches over to open loop, for instance if you had to accelerate hard for some reason temporarily. Lean open loop fuelling in 5th gear at 75mph WOT doesn't bear thinking about...
As already mentioned above, 30mpg is a pretty healthy return.
I think about an Impreza with a 2 wheel drive, zero boost button, so I can cruise up to Scotland from the Midlands at 40MPG before blatting round the Highlands at 15MPG.
Is that too much to ask?
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Originally Posted by Beer Good
drumsterphil
27 at 90+ sounds like heaven, what boost are you running?
27 at 90+ sounds like heaven, what boost are you running?
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