air fuel ratio with boost

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01-29-2015 | 11:12 AM

#51

sutphen 30

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Joined: Jan 2006

Posts: 3,598

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From: taxachusetts

Quote:

Originally Posted by Keith Atlanta

So if they are running so rich how the heck do they get a claimed 29MPG highway?

steep overdrive,at like 70mph thing tachs at around 1500rpm.plus its very small throttle opening/lean cruise afr's.

01-29-2015 | 12:37 PM

#52

hogie roll

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Joined: Jan 2006

Posts: 3,865

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From: St. Pete Beach, FL

Quote:

Originally Posted by SB

Crusie is not 50-60% throttle with very heavy load, like a lot of boats are.

I'll take a stab at it, but it probably only takes 35-45hp for a Vette to cruise at 65mph. So,,,,very light throttle, very high vacuum, very little oxygen/fuel in that combustion chamber....ie:very low cylinder pressure.

If you know the Cd and frontal area I'll calculate it with a rolling load estimate.

01-29-2015 | 02:45 PM

#53

Baldie

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Joined: Jun 2012

Posts: 231

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From: Toledo, Oh

Quote:

Originally Posted by hogie roll

If you know the Cd and frontal area I'll calculate it with a rolling load estimate.

I would say around 2.2M, .280 Cd...

BTW, a ECOboost can run 1600EGT for hours on end with no issues - if you have proper cylinder distribution and the proper timing, 12.8 won't hurt one bit, especially with piston squirters.