16k miles in a 35is

[Busterboo]

And the rest of the post says, 'Super Unleaded = an extra 30bhp above 5.500 revs'?

[techathy]

No, not quite.
Low quality super unleaded = better performance than 95RON under heat soak conditions
High quality super unleaded = better performance then 95RON under heat soak conditions with +30bhp more power peek, by holding on to boost for longer, under non-heatsoak conditions.

[Busterboo]

Thank you.

[step_change]

I know this is one of those subjects that gets people's passions roused but the BMW Z4 E89 owners manual says quite clearly that RON 95 is required. Not sure there is a need to pay extra £7ish per tankful. That said being a pride and joy and in the context of car ownership costs, that is not really a lot in the great scheme of things.

[Nanu]

under heat soak conditions?

[step_change]

Pardon my ignorance but WTF are "heat soak" conditions? And how do they relate to me driving my 35is at 80mph?

[Z4M-2006]

Just think how hot your engine bay gets..

The cylinder head temp.

Intake pipe temps..

This all heat soaks the inlet and the inlet temp sensor see the temp go up,the DME reacts to that by retarding basic ignition and valve timing.By retarding the timing values,the engine power reduces...
The DME also takes values from the knock sensors.The knock sensor will detect "noise" in the cylinders under combustion,mainly detonation noise.. Better fuel gives less combustable noise,so the DME can increase the timing giving better power.

Use Tesco Momentum and its about £3.50 difference over a tank full...

Why wouldnt you....?

[Smartbear]

Just think how hot your engine bay gets..

The cylinder head temp.

Intake pipe temps..

This all heat soaks the inlet and the inlet temp sensor see the temp go up,the DME reacts to that by retarding basic ignition and valve timing.By retarding the timing values,the engine power reduces...
The DME also takes values from the knock sensors.The knock sensor will detect "noise" in the cylinders under combustion,mainly detonation noise.. Better fuel gives less combustable noise,so the DME can increase the timing giving better power.

Use Tesco Momentum and its about £3.50 difference over a tank full...

Why wouldnt you....?

Plus it cleans your engine better than the miser fuel
Rob

[Nanu]

Just think how hot your engine bay gets..

The cylinder head temp.

Intake pipe temps..

This all heat soaks the inlet and the inlet temp sensor see the temp go up,the DME reacts to that by retarding basic ignition and valve timing.By retarding the timing values,the engine power reduces...
The DME also takes values from the knock sensors.The knock sensor will detect "noise" in the cylinders under combustion,mainly detonation noise.. Better fuel gives less combustable noise,so the DME can increase the timing giving better power.

Use Tesco Momentum and its about £3.50 difference over a tank full...

Why wouldnt you....?

Nope still don't understand any of that. Just think I will drive the thing and remain ignorant but happy.

[Kugaman1]

Plus it cleans your engine better than the miser fuel
Rob

Hmm..... I know Shell/Bp 98 ron fuels have good cleaning properties in them.....does momentum have anything over regular Tesco fuel?

I’m not so sure....

[Smartbear]

Plus it cleans your engine better than the miser fuel
Rob

Hmm..... I know Shell/Bp 98 ron fuels have good cleaning properties in them.....does momentum have anything over regular Tesco fuel?

I’m not so sure....

They made a song & dance about its magical properties at the time, don’t know if it’s as good as the others though?
Rob

[Kugaman1]

It’s cheaper tho!!!!

[Vonlipvig]

I popped to tesco by work to give momentum a try, is 2p/litre cheaper that 95 at my three local petrol stations! If its a bit better for the internals of the engine or not, is still cheaper than regular for me