600 Performance numbers.....

[BILGAL]

Check it out...

http://www.mtdemocrat.com/articles/2004/01/15/road_beat/x1501_a.txt

 

[RobertBolinger]

Looks like he may have also been at the event that Joe Donnelly was at based on his comment about three loaded trucks and a radar gun. Great article.

 

[wxman]

Interesting article. Thanks for the link.



What do you suppose the writer meant by "... To make this kind of power the bullet proof turbo charger delivers an astounding 61 inches of boost... . " in the fourth paragraph?



61 inches of mercury?

 

[lkuykendall]

I bet that the "61" was inches of mercury:



61 inches of mercury = 29. 9571 psi





Len

 

[DLeno]

My 04 acheives 61 inches of mercury too. says my obd II scanner. thats only 15. 26 lbs of boost...

 

[DPelletier]

My calculations show 61 inches of mercury = 29+ psi.

 

[ceastmen]

Ok Got the Fluid Mechanics book out (uuughhh)



I concur with DPelletier.



61 in Hg = 29. 959 psi,



Also checked my TI-89 (engineering calculator) it converts 61 inches of Mercury (inHg) to 29. 960 psi.



That's a lot of boost!

 

[Bob4x4]

The scanner also sees atmospheric pressure to start so deduct about 14. 7 in my neck of the woods.



Bob

 

[Blakers]

So, it's looking at absolute pressure, rather than gauge pressure?

 

[DLeno]

yes, the MAP sensor is "Manifold Absolute Pressure", measured in inches of mercury and reported via OBD. When the engine is not running, your MAP sensor becomes as barometer. So to find boost from MAP, convert inches of mercury to psi, then subtract 14. 7. 61 inches of MAP is about 15 lbs of boost.



but reading through the thread again, I note that the article said that the turbocharger "delivered" 61 inches of "boost". So that must be 61 inches above normal atmospheric pressure (thats what boost is) or about 30 psi of "boost". What was initially confusing is that boost is almost never given in units of "inches of mercury" whereas Manifold Absolute Pressure is always reported (by OBD) in those units.



So I think the article just did what statisticians do best: express a mathematical quantity in the unit that delivers the most impressive message with a big number. They probably just took the nominal wastegate setting in psi and converted it to inches of mercury for effect. If they wanted to be really impressive, they could have said that the turbocharger delivers an intake air pressure equal to 91 inches of mercury.



I set my OBD MAP gauge to read 0 to 100 inches of mercury, knowing that 90 inches is approximately 30 psi boost. I acheive 61 inches routinely in daily driving.

 

[DPelletier]

If they wanted it to sound REALLY impressive, they should have stated 827. 77 inches water column!



Dave

 

[Crunch]

Originally posted by wxman

What do you suppose the writer meant by "... To make this kind of power the bullet proof turbo charger delivers an

We've got a lot of hunters here; who wants to be the first to test that "bullet proof" theory?

 

[AFacey]

Has anyone heard if they made any changes to the auto trans for 04. 5 (600)?

 

[RobertBolinger]

Originally posted by Crunch

We've got a lot of hunters here; who wants to be the first to test that "bullet proof" theory?

It's certainly "bulletproof" to a BB, maybe a . 22- but a . 30-06 would rip it to shreds!



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