Mavericks dyno test

[CatmanV2]

"A typical BMW engine will gain between 15 and 20bhp between race gas and pump gas... on a standard tune"

Interesting, glad he's put that one to bed Catman can now keep quiet at the back!

I simply don't believe it

C

 

[Contigo]

I simply don't believe it

C

Why am I not surprised? Despite an explanation of how it retards timing and detonation detection etc you still don't believe it?

 

[CatmanV2]

Why am I not surprised? Despite an explanation of how it retards timing and detonation detection etc you still don't believe it?

OK
I'm not quite sure what you think I've said in the past (nor am I, but that's my problem)

My case has always meant to be that higher octane will have no benefit unless the ECU is able to take advantage of that. Nothing he is saying there changes my POV. I'll confess to an element of surprise that a BMW engine will get a power hike using *RACE* gas as opposed to *PUMP* gas on a normal tune. I'm struggling to see if there's any other differences apart from the very much higher Octane than anything that you can get out of a pump here.

Interesting that he also says that changing the software will make no difference unless you make hardware mods as well.....

C

 

[Contigo]

It seems clear that a modern BMW standard tune does indeed benefit from different RON fuels. I guess this still ties in with your theory that it will be of no benefit to cars which are not mapped for these fuels.

 

[CatmanV2]

It seems clear that a modern BMW standard tune does indeed benefit from different RON fuels. I guess this still ties in with your theory that it will be of no benefit to cars which are not mapped for these fuels.

It's not really a theory. It's exactly what he's saying

How old is the vid, anyway?

C

 

[rockits]

I thought modern engines could sense when a higher octane is used and adjust accordingly.

 

[allandwf]

I thought modern engines could sense when a higher octane is used and adjust accordingly.

Yes I believe they can, but it is not instant. I know the gas fired jet engines at work,I know not quite the same thing, will work out the CV of the gas used and adjust to suit.

 

[CatmanV2]

Yes I believe they can, but it is not instant. I know the gas fired jet engines at work,I know not quite the same thing, will work out the CV of the gas used and adjust to suit.

Oh it's pretty much instant.
But it can only adjust through the range the map can accommodate, and there's a physical constraint as to the compression ration which (in an NA engine, at least) is pretty fixed.

As the good man in the video says, you want the ignition to occur such that the maximum mechanical advantage is gained. Agains that is the desire for higher compression engines which are more efficient, but increase the liklihood of the pinking (which is going to mean the fuel is detonating before you ignite it).

C

 

[Contigo]

My Golf was designed to run on the old 4 star. Since having it I ran it on standard UL but it has pinked badly and gummed up the injectors, now I only run it on SUL and it is much happier.

 

[CatmanV2]

My Golf was designed to run on the old 4 star. Since having it I ran it on standard UL but it has pinked badly and gummed up the injectors, now I only run it on SUL and it is much happier.

Had it de-coked at all?

C

 

[Contigo]

Had it de-coked at all?

C

No I'm not on dry February and the two usually go hand in hand!

 

[CatmanV2]

No I'm not on dry February and the two usually go hand in hand!

That would explain why you're detonating

C

 

[allandwf]

Oh it's pretty much instant.
But it can only adjust through the range the map can accommodate, and there's a physical constraint as to the compression ration which (in an NA engine, at least) is pretty fixed.

As the good man in the video says, you want the ignition to occur such that the maximum mechanical advantage is gained. Agains that is the desire for higher compression engines which are more efficient, but increase the liklihood of the pinking (which is going to mean the fuel is detonating before you ignite it).

C

Ah,ok. I was told it took 2 to 3 tankfulls to get full benefit, assume it was just to get rid of the lower octane fuel.

 

[Gogs253]

My SAAB needs a long adaptation run under load for the ECU to adapt to higher octane fuel. If I use lower octane fuel, the ECU cuts back the boost to stop detonation. It's not a new model but a mid nineties car and performs much better on Shell v power.

 

[philw696]

You could really make that Golf of yours fly Phil by taking the head off and de coking it and polishing the ports.
Drop the sump and get the Pistons out and re ring it after honing the bores.
A tubular manifold instead of that heavy piece of cast iron and a single silencer exhaust she will be mint mate.

 

[midlifecrisis]

You could really make that Golf of yours fly Phil by taking the head off and de coking it and polishing the ports.
Drop the sump and get the Pistons out and re ring it after honing the bores.
A tubular manifold instead of that heavy piece of cast iron and a single silencer exhaust she will be mint mate.

Blueprinting as they call it in the motorcycle world. Used a lot in production and supersport classes where engine tuning is restricted. Basically it's making sure the bores are perfectly cylindrical and the pistons fit with the minimum tolerances as well as other things. Even with modern manufacturing techniques there's a bit more room to spare. And it's not a modification that the insurance company needs to know about because you are making sure the engine is perfect. Also increases reliability.

 

[Contigo]

You could really make that Golf of yours fly Phil by taking the head off and de coking it and polishing the ports.
Drop the sump and get the Pistons out and re ring it after honing the bores.
A tubular manifold instead of that heavy piece of cast iron and a single silencer exhaust she will be mint mate.

Leaving her standard mate, really don't want to start modding!

 

[philw696]

Okay Phil but over 30 years of carbon and varnish etc you would really notice the benefits with better fuel consumption and performance as a bonus.
Just taking the head off the head gasket would look grim with age.

 

[safrane]

My MK1 Golf had a real grubby engine and the fuel tank was rusted and full of s h i t.

25 years of motoring takes its toll and Phil spent an age getting her to run properly with the original Pierburg carb with Auto choke.

 

[Contigo]

My MK1 Golf had a real grubby engine and the fuel tank was rusted and full of s h i t.

25 years of motoring takes its toll and Phil spent an age getting her to run properly with the original Pierburg carb with Auto choke.

Mines had a new filler neck, fuel pump and has only just done 100k miles, nothing. It's been really well looked after I can assure you. Runs like a dream now on this SUL.