salat6

847 875 045 1999 please call bob in chicago i would love to experience a sc 996 maybe we could meet for a drive thanx

salat6

847 875 0435 is phone thanx

wwest

Boost, effective CR increase, that is provided externally can be intercooled whereas pure piston CR cannot. Look at what would happen if ALL compression pressure could be intercooled.

So the more BOOST provided via external intercooled methods the better.

1999Porsche911

Cool. So I'm going to lower my static CR to 1:1 and pump in 60 psi of boost. My car will be the bomb at the strip. It won't matter that the ingested air will be 500+F.

Tippy

Ok, I got the numbers for my car from Protomotive (Carrera 3.2).

9.5 CR - 10.5 lbs boost - ~16.5 Effective CR = 400 hp
8.8 CR - 12.75 lbs boost - ~17:1 Effective CR = 485 hp

Dyno results of my car

8.0 CR - 15 lbs boost ~16 Effective CR = 514 hp

These are real world results and all things equal.


Compression went down, boost went up, HP went up in all 3 examples.

1999Porsche911

What is it about "all things being equal" don't you understand? First of all, "effective CR can only be changed with internal mechanic mods and is slightly effected by VE. I never mentioned effective CR.

Other than a few hp difference from the all accurate dyno runs, my statement stands correct even based on your 3 examples. As boost compression ratio rises, so does power, regardless (all else being equal) of what portion of the boost compression comes from static of induction.

Nice try tho. Back to your research.

Tippy

All things equal mean, CI, turbo size in my example, IC, etc etc from the same company.

Effective CR is static CR with boost for a total CR.

Boost compression ratio? You mean Effective CR?

1999Porsche911

Let's accept your incorrect difinition of "effective" CR. Why are the engines with a higher effective CR producing more power? Because they should. Which is exactly what I stated.

How does this fact and your example above challenge what I stated? You're not trying to change the debate to something else again, are you? Here is a reminder of what I stated, found on the previous page.

Everything else being equal, it make no difference whether you have low compression high boost or high compression low boost. If boosted compression ratio is the same, the risks and rewards at maximum boost are the same. However, the engine with the higher CR will overall, out perform the one with lower CR.

Tippy

I think you have the wrong definition.

There are tons of "effective CR" calculators out there for calculating after boost CR.

Try this site and look at the "compression ratio calculator plus". It talks about calculating "effective CR".

http://performancetrends.com/Compres...lator_V2.3.htm

Tippy

No Im not, you said the higher CR/lower boost motor will make slightly higher power than the lower CR/higher boost engine.

I gave real world results even with mine.

1999Porsche911

Wait, stay on subject. Using your example of the 2 3.2 engines:

9.5 CR - 10.5 lbs boost - ~16.5 Effective CR = 400 hp
8.8 CR - 12.75 lbs boost - ~17:1 Effective CR = 485 hp

How does this differ from my statement?

Tippy

I never veered off.

You said the slight HP advantage would go to the higher CR/lower boost vs. the lower CR/higher boost motor.

I showed you with real world examples (same company, motor, and dyno) that I disagree.

Hell, I threw in the "Effective CR" for ***** and giggles to show they are fairly close.

We both know 0.5:1 compression bump (in Effective CR) did not account for the 85hp gain above, it was BOOST.

Like I posted before.....boost ftw

1999Porsche911

Disagree about what? Do you even know what we are debating? Your example shows an engine with higher effective Cr is more powerful. Really? I didn't know anyone ever stated otherwise.

Why don't you reread this thread slowly and see if you can get a handle on what we are discussing.

I'll let you debate this new subject with yourself. I'm tired of responding to you about something I am not even talking about.

Tippy

Let me start from the beginning.

You were talking about safety of an engine with the above stats.

Then, I threw in the joke of which one would make more power.

Then you stated this above.

I havent changed my comment that I disagree with the statement above and said the higher boost/lower CR motor in your example would make more power vs the higher CR/lower boost.

I then backed it up with a real world, apples to apples comparison reinforcing my point that I beat to death.

atx.911

you guys are a bunch of dorks, you all are WAY off the subject. Losers