[FastLane]

Ok ill give you that, Shit is not happening to everyone. I will rephrase my comment. Shit is happeneing to SOME people. Im not dissing the fine hard work of any of the tuners out there like Shiv etc...and shit does happen and usually at the worst time, but why again, did they lower the CR and can safely claim to acheive a higher boost (and lessor hp/torque numbers might I add)?

[scalbert]

Originally Posted by FastLane

Right unless you have to...why did Alpina HAVE TO lower their CR ? Why did they change the pistons?

There may not have been a requirement. It may have been more of a desire to bolster their engineering prowness; or marketing.

[FastLane]

True. Thats a good point, look at it from a marketing standpoint...but if you look at the link detailing the 4.4L V8 TT below:

http://www.autoblog.com/2008/01/21/d...turbo-4-4l-v8/

especially the last picture depicting the pistons used to achieve a low CR, maybe Alpina's onto something...thats all.

[O-cha]

Originally Posted by FastLane

Ok ill give you that, Shit is not happening to everyone. I will rephrase my comment. Shit is happeneing to SOME people. Im not dissing the fine hard work of any of the tuners out there like Shiv etc...and shit does happen and usually at the worst time, but why again, did they lower the CR and can safely claim to acheive a higher boost (and lessor hp/torque numbers might I add)?

Again the shit that you talk about has nothing to do with the car being at the limit and needing a lower compression ratio, why do you not get this?

As for alpina, yea they dropped the CR, and upped the boost just like you say. Then they are quoting about 360 HP (probably less at the wheels), at 16psi, with likely many other supporting upgrades. Yet were getting that at the wheels now with 14psi.

So your point is what in bringing this up, to say that you're wrong? I am glad we finally agree.

[O-cha]

Jesus christ, just google "direct injection cooling effect" and have a field day with it.

[scalbert]

Originally Posted by FastLane

True. Thats a good point, look at it from a marketing standpoint...but if you look at the link detailing the 4.4L V8 TT below:

http://www.autoblog.com/2008/01/21/d...turbo-4-4l-v8/

especially the last picture depicting the pistons used to achieve a low CR, maybe Alpina's onto something...thats all.

To be honest, if a large budget is put aside and the objective is a safe and effective upgrade, Alpina did that. However, that is not to say it was required. It was a tried and true method knowing that it would work and garner attention.

It is always safer to run more boost with less compression and/or less ignition timing advance. But that doesn't mean the current levels with the available tunes are unsafe.

[scalbert]

Originally Posted by O-cha

Jesus Christ just googled "direct injection cooling effect"

I would assume Jesus would not need Google, he would just know.

[FastLane]

ok you have prooved that I am wrong several times already since the second post on this thread. And you've prooved Alpina wrong too, congrats, here's your cookie.

BUT, the ecu flash potential is nearing its peak performance levels and Alpina is the first one to lower the CR and alter major engine components. Just wanted to know what everyone thought about that....

[scalbert]

Originally Posted by FastLane

ok you have prooved that I am wrong several times already since the second post on this thread. And you've prooved Alpina wrong too, congrats, here's your cookie.

BUT, the ecu flash potential is nearing its peak performance levels and Alpina is the first one to lower the CR and alter major engine components. Just wanted to know what everyone thought about that....

I would disagree, Alpina wasn't proven wrong. They just chose a safer path; that is neither righ or wrong.

In the long rung, the Alpina engine may be able to go further due to the changes. But other parts may fail prior to the benefits being realized. We'll have to wait and see on that...

[O-cha]

Originally Posted by scalbert

I would disagree, Alpina wasn't proven wrong.

He was just trying to pacify me.

[scalbert]

Originally Posted by O-cha

He was just trying to pacify me.

As if that is possible...

[335iheLLraiseR]

Originally Posted by scalbert

As if that is possible...

+1

gotta admit, its entertaining though.

[Sniz]

Originally Posted by 335iheLLraiseR

+1

gotta admit, its entertaining though.

+2

almost as entertaining as that girl getting bitch slapped in your sig.

[grkm3]

no need for pistons yet,A decent copper head gasket will get the car in the 500whp range after that is when you can start to worry about the block,rods,pistons ect...

[AWD Addict]

Originally Posted by O-cha

Fixed it for you.

such a bastard.

[AWD Addict]

Originally Posted by FastLane

This is a big step to adding larger turbos/allowing more boost without detination!

Thoughts? Comments?

Originally Posted by FastLane

With a gasoline DI, it could pre-ignite prior to spark but the chances would be minimal if your fueling through the powerstroke which is the added benefit of DI (more precise timing and quantity of fuel delivery). This pre-ignition, even a small amount with high hp application, can lead to engine deteriation due to the stress applied to the cylinder walls.

With a diesel DI you are already fueling through the combustion cycle (powerstoke) so pre-ignition isn't possible.

oops. preignition is different than detonation.

[AWD Addict]

Originally Posted by O-cha

You do realize you're talking about two different things right? Yea probably not.

Great. I spit beer on my monitor.

[AWD Addict]

Originally Posted by FastLane

This engine can put up huge numbers, the block is strong and its NATURALLY BALANCED (lets not get into how a 90 degree V8 and an I6 are the only nat'l balanced engine), so therefore, its a canvas for speed.

Isn't the Boxer Engine the most balanced engine format?

[FastLane]

the Boxer engine is just an engine type, just as the V or I set at 180 degrees or 0 (but no one does this). Depending on how you mount it, transversely or longitudely and the number of cyclinders used, determines the balance of an engine (also the amount of strokage, 2 or 4). Also a boxer engine DOES require a balance shaft where as a I6 does not.

A quick calculation (for V engines this doesnt apply to an I) to determine a 4 stroke engine balance is by taking 720 degrees (because there are two revolutions per every 4 stroke ie 1 cycle) and dividing it by the number of cylinders. In this case we'll use a V8. 720/8 = 90...as in 90 degrees. This is the distance between firing events. So if you seperate your cyclinders firing by 90 degrees you can achieve a near perfect balance.

A straight 6 is perfectly balanced because cylinders 1 and 6, 2 and 5, 3 and 4, are in opposite cycles (when 1 is in the compression stroke, 6 is in its exhaust stroke) and this naturally balances the engine.

and yes I know that pre-ignition ISNT detination, but if you pre-ignite to early and too hard, you have a pretty good chance of detinating/knocking theoretically speaking, even in a DI engine (just less likely)

[DrDomer]

FYI... it would help your argument and appearance of knowledge if you would spell detination --> detonation.

[luckyD]

what else did Alpina had to do to change compresion ratio? just the mahle pistons?

[O-cha]

Originally Posted by DrDomer

FYI... it would help your argument and appearance of knowledge if you would spell detination --> detonation.

NOOOOOO why did you tell him. It was way more fun when he didn't know.

luckyd, just dished pistons