New battery - overall improvement?

[ChilliWhizz]

I fitted a new battery today, the old one was on its last legs, and, as expected, she cranks over now like a mad thing.... but, and I'm sure it's my imagination, I sense an improvement in low rev performance.. A bit smoother maybe.. can't quite put my finger on it... is it the alternator not having to work overtime to charge an ageing battery.. not sapping power from the engine and electrical system??? Or just my imagination....

Any thoughts chaps???

Chilli

[swallet]

Imagination!

Mine gains at least 10bhp even after a wash and polish!

Still cheap gains for you.

[QBee]

What you say makes sense to me..... Just out of interest, have you checked the 100 amp fuse is intact? That would have made it run rough. You can check it with a multimeter at the back of the altimeter.

[Milky400]

I remember the same feeling when I replaced my chimaera battery. I assumed it was because the ecu reset.... But as said could be the placebo effect.

[Bassfiend229hp]

Milky400 said:

I remember the same feeling when I replaced my chimaera battery. I assumed it was because the ecu reset.... But as said could be the placebo effect.

Working where I do I'm *VERY* aware of this effect...

[ChilliWhizz]

QBee said:

What you say makes sense to me..... Just out of interest, have you checked the 100 amp fuse is intact? That would have made it run rough. You can check it with a multimeter at the back of the altimeter.

Morning QBee, any clues as to where the altimeter might be located on a '98 500? It's deffo not on the dash

[zed4]

ChilliWhizz said:

QBee said:

What you say makes sense to me..... Just out of interest, have you checked the 100 amp fuse is intact? That would have made it run rough. You can check it with a multimeter at the back of the altimeter.

Morning QBee, any clues as to where the altimeter might be located on a '98 500? It's deffo not on the dash

Next to the barometer and accelerometer.

[glow worm]

ChilliWhizz said:

Morning QBee, any clues as to where the altimeter might be located on a '98 500? It's deffo not on the dash

Only fitted to low flying Chims and the Looney tunes Tuscan .

[Sardonicus]

Its possible you noticed a difference ECU's run an algorithm or compensation for differing battery voltages thus changing injection duration/fuel metered unfortunately its not an exact science so conditions are approximate not exact, you may have found with your old battery that even though your alternator was charging said battery while the engine was running the average voltage differed from that with your new battery (probably lower) you get the drift here is an example of the compensations the ECU can make (in between jobs so I had time to type this) ......... really depends on how bad your old battery was but to some it up yes its possible that your engine runs differently now

Edited by Sardonicus on Friday 3rd October 09:58

[portzi]

glow worm said:

ChilliWhizz said:

Morning QBee, any clues as to where the altimeter might be located on a '98 500? It's deffo not on the dash

Only fitted to low flying Chims and the Looney tunes Tuscan .

BBMF chims have them fitted to the old Sqn Ldrs car

[ChilliWhizz]

Sardonicus said:

Its possible you noticed a difference ECU's run an algorithm or compensation for differing battery voltages thus changing injection duration/fuel metered unfortunately its not an exact science so conditions are approximate not exact, you may have found with your old battery that even though your alternator was charging said battery while the engine was running the average voltage differed from that with your new battery (probably lower) you get the drift here is an example of the compensations the ECU can make (in between jobs so I had time to type this) ......... really depends on how bad your old battery was but to some it up yes its possible that your engine runs differently now

Edited by Sardonicus on Friday 3rd October 09:58

That's very interesting, thanks Simon The old battery would hold a charge for many days sufficient to open doors/boot etc but lost its ability to crank the engine after about two days of non use..... I'd been carrying the new battery around in the boot, I've got an Anderson connector under the bonnet so have had back up the last few weeks.... When I did change the battery it only took about twenty minutes... and that included a tea break

[QBee]

portzi said:

glow worm said:

ChilliWhizz said:

Morning QBee, any clues as to where the altimeter might be located on a '98 500? It's deffo not on the dash

Only fitted to low flying Chims and the Looney tunes Tuscan .

BBMF chims have them fitted to the old Sqn Ldrs car

At last the iPad autocorrect has proved good for something!! Nearly crying with laughter here - nice ones chaps - all your responses are very good