B8 S4 Ownership
Discussion
How to dial out "Rev Hang" ?
Rev Hang = mostly noticeable in manual gearbox cars, when you put the clutch in to change gear and the revs don't fall.
Also when in-gear at low speeds (say driving through town in 1st), where you come off the accelerator and the revs stay where they are, driving the car forward at the same speed instead of engine brake slowing down.
Can 'rev hang' be easily removed in the B8 S4 manual?
Is it an ECU tuning step that needs to be done?
Cheers.
Rev Hang = mostly noticeable in manual gearbox cars, when you put the clutch in to change gear and the revs don't fall.
Also when in-gear at low speeds (say driving through town in 1st), where you come off the accelerator and the revs stay where they are, driving the car forward at the same speed instead of engine brake slowing down.
Can 'rev hang' be easily removed in the B8 S4 manual?
Is it an ECU tuning step that needs to be done?
Cheers.
GroundZero said:
How to dial out "Rev Hang" ?
Rev Hang = mostly noticeable in manual gearbox cars, when you put the clutch in to change gear and the revs don't fall.
Also when in-gear at low speeds (say driving through town in 1st), where you come off the accelerator and the revs stay where they are, driving the car forward at the same speed instead of engine brake slowing down.
Can 'rev hang' be easily removed in the B8 S4 manual?
Is it an ECU tuning step that needs to be done?
Cheers.
I'm about to sell mine but I agree it's pretty annoying. Rev out in first and want to change straight to fourth, but the engine is just revving away! Any idea what they were trying to achieve by programming it this way?Rev Hang = mostly noticeable in manual gearbox cars, when you put the clutch in to change gear and the revs don't fall.
Also when in-gear at low speeds (say driving through town in 1st), where you come off the accelerator and the revs stay where they are, driving the car forward at the same speed instead of engine brake slowing down.
Can 'rev hang' be easily removed in the B8 S4 manual?
Is it an ECU tuning step that needs to be done?
Cheers.
Wild guess would be to help folks who take a while to change up and have a habit of dumping the clutch? Subsequently a slight annoyance for those who do boot it in first then want to calmly put it into third or fourth at the pace that the revs come down to match in a Barry the Oik to Mrs Miggins manovre that the very clever engineers may not have had explained to them by an adult? 
Have racked up the first 1,000 miles in my 2011 S5, with far more motorway miles than I usually do.
Result is 295 miles - mostly on motorways and dual carriageways - at 30.8mpg and 317 miles at 26.8mpg with varied town and country driving and probably a chunk of relaxed motorway miles in that, too. That’s on super unleaded.
Doesn’t seem too bad. Don’t think I can get much higher than 34mpg indicated on the motorway maintaining 60-70mph, depending upon hills/traffic etc, which is not thaaat different to my 4.2 V8 FSI A6, but it seems much better around town, showing 18-22mpg ish, depending upon how slow/busy it is, compared with 13-18mpg or so.
Both cars are on relatively light 18-inch wheels, though the S5 is on the higher tyre pressures advised for winter/all-season tyres, as it has Michelin CrossClimate+ fitted…
How does that compare to other pre-facelift S4/S5s here?
Result is 295 miles - mostly on motorways and dual carriageways - at 30.8mpg and 317 miles at 26.8mpg with varied town and country driving and probably a chunk of relaxed motorway miles in that, too. That’s on super unleaded.
Doesn’t seem too bad. Don’t think I can get much higher than 34mpg indicated on the motorway maintaining 60-70mph, depending upon hills/traffic etc, which is not thaaat different to my 4.2 V8 FSI A6, but it seems much better around town, showing 18-22mpg ish, depending upon how slow/busy it is, compared with 13-18mpg or so.
Both cars are on relatively light 18-inch wheels, though the S5 is on the higher tyre pressures advised for winter/all-season tyres, as it has Michelin CrossClimate+ fitted…
How does that compare to other pre-facelift S4/S5s here?
RoVoFob said:
Have racked up the first 1,000 miles in my 2011 S5, with far more motorway miles than I usually do.
Result is 295 miles - mostly on motorways and dual carriageways - at 30.8mpg and 317 miles at 26.8mpg with varied town and country driving and probably a chunk of relaxed motorway miles in that, too. That’s on super unleaded.
Doesn’t seem too bad. Don’t think I can get much higher than 34mpg indicated on the motorway maintaining 60-70mph, depending upon hills/traffic etc, which is not thaaat different to my 4.2 V8 FSI A6, but it seems much better around town, showing 18-22mpg ish, depending upon how slow/busy it is, compared with 13-18mpg or so.
Both cars are on relatively light 18-inch wheels, though the S5 is on the higher tyre pressures advised for winter/all-season tyres, as it has Michelin CrossClimate+ fitted…
How does that compare to other pre-facelift S4/S5s here?
I can get "a car instrument indicated" 38mpg on the motorway if I stick it in cruise control and between 18-26mpg around town depending on how much I plant my hoof. But I've got the CREC engine with added MPI and an electromagnetic clutch on the supercharger, so I would say you are seeing pretty good "indicated" economy figures.Result is 295 miles - mostly on motorways and dual carriageways - at 30.8mpg and 317 miles at 26.8mpg with varied town and country driving and probably a chunk of relaxed motorway miles in that, too. That’s on super unleaded.
Doesn’t seem too bad. Don’t think I can get much higher than 34mpg indicated on the motorway maintaining 60-70mph, depending upon hills/traffic etc, which is not thaaat different to my 4.2 V8 FSI A6, but it seems much better around town, showing 18-22mpg ish, depending upon how slow/busy it is, compared with 13-18mpg or so.
Both cars are on relatively light 18-inch wheels, though the S5 is on the higher tyre pressures advised for winter/all-season tyres, as it has Michelin CrossClimate+ fitted…
How does that compare to other pre-facelift S4/S5s here?
ninjag said:
I can get "a car instrument indicated" 38mpg on the motorway if I stick it in cruise control and between 18-26mpg around town depending on how much I plant my hoof. But I've got the CREC engine with added MPI and an electromagnetic clutch on the supercharger, so I would say you are seeing pretty good "indicated" economy figures.
Sounds like a decent step up but not a million miles away. I imagine my car must be getting some benefit from the lighter wheels and presumably running on super unleaded too. Will have to experiment to see how low I can get the economy next…!I didn’t find a benefit from super in back to back tests on a car that’s not been mapped. Fuel flap quotes 95 and considered opinion is that it doesn’t produce more power on 98 or 99 unless mapped for it. Might run a little sweeter though
I average (brimmed tank to brimmed tank) low to mid 20s mpg. Most I’ve had his 26-28 on a really gentle run without cold starts. Winter weather will cripple that figure (more like 16-18) as it chucks fuel in like an alcoholic on proper cold start!
I don’t pin it everywhere, but I don’t baby it either. 91k miles now and still going strong! Do quite a mix of short and long runs as well - when my wife uses it to commute she’s on the motorway within 5 mins of leaving the house
I average (brimmed tank to brimmed tank) low to mid 20s mpg. Most I’ve had his 26-28 on a really gentle run without cold starts. Winter weather will cripple that figure (more like 16-18) as it chucks fuel in like an alcoholic on proper cold start!
I don’t pin it everywhere, but I don’t baby it either. 91k miles now and still going strong! Do quite a mix of short and long runs as well - when my wife uses it to commute she’s on the motorway within 5 mins of leaving the house
In my manual 09 S4 (so the early engine, no supercharger clutch) i will average 32 or most distance runs including motorway, 34 if im gentle*. In town/urban areas- c22, can be down to 18. Not checked the long term average.
- a drive into Germany which had us cruising at c 85-90mph still averaged 30-31mpg overall..
RoVoFob said:
ninjag said:
I can get "a car instrument indicated" 38mpg on the motorway if I stick it in cruise control and between 18-26mpg around town depending on how much I plant my hoof. But I've got the CREC engine with added MPI and an electromagnetic clutch on the supercharger, so I would say you are seeing pretty good "indicated" economy figures.
Sounds like a decent step up but not a million miles away. I imagine my car must be getting some benefit from the lighter wheels and presumably running on super unleaded too. Will have to experiment to see how low I can get the economy next…!ninjag said:
RoVoFob said:
ninjag said:
I can get "a car instrument indicated" 38mpg on the motorway if I stick it in cruise control and between 18-26mpg around town depending on how much I plant my hoof. But I've got the CREC engine with added MPI and an electromagnetic clutch on the supercharger, so I would say you are seeing pretty good "indicated" economy figures.
Sounds like a decent step up but not a million miles away. I imagine my car must be getting some benefit from the lighter wheels and presumably running on super unleaded too. Will have to experiment to see how low I can get the economy next…!InfamousK said:
ninjag said:
RoVoFob said:
ninjag said:
I can get "a car instrument indicated" 38mpg on the motorway if I stick it in cruise control and between 18-26mpg around town depending on how much I plant my hoof. But I've got the CREC engine with added MPI and an electromagnetic clutch on the supercharger, so I would say you are seeing pretty good "indicated" economy figures.
Sounds like a decent step up but not a million miles away. I imagine my car must be getting some benefit from the lighter wheels and presumably running on super unleaded too. Will have to experiment to see how low I can get the economy next…!I only ever run mine on 99 RON, it was a 59 plate manual and I never saw higher than 31.3 on a run. Was probably 25 most of the time, shorter trips etc.
Superchargers are never as economical as turbo, but you dont get the turbo lag.....
I have a 4.0 twin tubo v8 now and amazingly I can get 33mpg on a run and have averaged 21mpg over 5k miles - but mostly all short trips, thats 7 speed auto/engineering progress for you!
Superchargers are never as economical as turbo, but you dont get the turbo lag.....
I have a 4.0 twin tubo v8 now and amazingly I can get 33mpg on a run and have averaged 21mpg over 5k miles - but mostly all short trips, thats 7 speed auto/engineering progress for you!
Adrian E said:
I didn’t find a benefit from super in back to back tests on a car that’s not been mapped. Fuel flap quotes 95 and considered opinion is that it doesn’t produce more power on 98 or 99 unless mapped for it. Might run a little sweeter though
So, what you’re saying is that I immediately need to book in an MRC Stage 2 remap? For economy reasons…RoVoFob said:
So, what you’re saying is that I immediately need to book in an MRC Stage 2 remap? For economy reasons…
Sounds like essential man maths to me lolI’ve never bitten the bullet on any mapping - not sure why, but probably my built in worry of it going bang in spectacular fashion!
Dr G said:
Adrian is correct; there's zero benefit in using super unleaded.
All the RON number determines is resistance to knock (detonation), and if it doesn't knock on 95 then it won't knock on 98 either.
Without having read the whole conversation, but modern cars don't knock. They retard the ignition and/or adapt the fuelling so the car doesn't knock, to some degree. It is common for performance cars to need 98, but they are able to run 95 with slight losses in performance and/or mpg.All the RON number determines is resistance to knock (detonation), and if it doesn't knock on 95 then it won't knock on 98 either.
The B8 S4 has a mapping from the factory for 95. Most performance maps are based on 98 fuel tough.
In Germany, where 100 and even 102 fuel is readily available, tuner often opt even for those. And in the states, many tunes take advantage of E40-50 mixes, because of the availability of E85 fuel. (you use an App to get the mixture right)
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