Lets talk MPG

Posted: Thu May 01, 2008 10:39 am Post subject:

if the egr coats the i/c core, wouldn't that lower the heat transfer to the coolant therefore give you less cooling efficiency which leads to warmer intake air which gives worse mpg? so theoretically no egr on an i/c'd system would be beneficial. any thoughts on this?
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2004 Yukon XL Trying to keep stock
2000 gtp Custom I/C, TOGs, Custom PCM, 3.25'', HAI, VS cam Retired

Posted: Thu May 01, 2008 11:38 am Post subject:

WOT MPG is not what's in question.

The I/C is working at cruise, but not enough to make a difference...and if i'm not mistaken, warmer IAT is better milage. Just like you lose milage cooling off your thermostat and/or cooler plugs

Think about it...cooler air = denser air = needs more fuel to maintain a set A/F.

Do you want more power or better fuel economy?
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Hi, I'm Matt.

I'm the resident smartass and I have fourblack children: (ok, one's only half black..)
07.5 2500HD, Duramax, Edge Race Evo CTS, MBRP 5" Stainless, TransGo, Sleeves, EGR!, PCV
09 VRSCDX - Night Rod. Flat black, gloss black
02 Black Z06. All work done by New Era Perforamnce. 519/497 at the rear, 3100 lbs.
05 Arctic Cat Firecat F7 - Sold
07 Arctic Cat F8 Sno Pro - Smashed into 1000 orange pieces.

Posted: Thu May 01, 2008 11:44 am Post subject:

Posted: Thu May 01, 2008 4:58 pm Post subject:

I havent done shit yet but, Im doing 104's, 180 t stat, clean filter, ALOT of tuning. I did the math again...this tank of gas I calulated roughly 24~26mpg. not too shabby for having something fucked up in my tune....(my car rev's to 2000rpms, dies down to 400rpms, repeats at initial start-up till I put it in gear) ....and my WOT A/F is in the friggen 12's but, hot damn I only get 2-3degrees of KR with 18 degrees adv. Wee HOO
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ZZP stuff...
Heads (started as ZZP stg.3 with some improvements)
Cam (XPZ with a slightly different components for valve movment)
IC (Ford Cobra coolant resv., frt exchr the size of a engine rad. weight consum. rear expans. tank)
"Certified Auto Trans Shop" Transmission sold by ZZP...I have no comment for this peice of...great trans. Wink

Also,
SLP Headers <--FOR SALE
Eaton's Gen.3 M90

Posted: Thu May 01, 2008 5:05 pm Post subject:

So you get 15* of advance?

Posted: Thu May 01, 2008 8:39 pm Post subject:

well to chime in my new tune is showing almost 46* at criuse had a few bleeps of kr that i am dealing with and some wacky ltft's(+10 to 12 at some points) but overall i am avg about 29mpg right now. mixed city and highway with no egr ( coded off and ports filled in intake )

Posted: Fri May 02, 2008 2:02 pm Post subject:

cruise at 50-70 in overdrive 40 to 47*. saw a couple blipps of 49.
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06 GT, HPtuner, PLX Wideband, K&N CAI, 3.5 MPS, PLOG/PEM, 3" DP, Corsa Catback

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