Lets talk MPG
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Joe_OmertaOffline
Intercooled
Total posts: 867

Joe Ventresca
2000 Grand Prix GTP
Joined: 24 Jul 2005
Location: Blasdell
Age: 37
PostPosted: Thu May 01, 2008 10:39 am    Post subject: Reply with quote

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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KC2GIWOffline
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Matt Antonio
1998 Grand Prix GTX
Joined: 11 Jun 2004
Location: SYR/ROC
Age: 24
PostPosted: Thu May 01, 2008 11:38 am    Post subject: Reply with quote

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
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GTP98Offline
Street Slicks
Total posts: 1787

Jay
1998 Grand Prix GTP
Joined: 03 Oct 2003
Location: b-loooooow
Age: 43
PostPosted: Thu May 01, 2008 11:44 am    Post subject: Reply with quote

KC2GIW wrote:


You got a lot of things going against you.

I think the EGR is good for at least a full MPG.

104s are cold..but I mean..you need them.

g/l...interesting stuff.


yuppers you are right. It will be interesting to see what happens. I travel 60 miles a day, 95% is highway so any increase should show itself after a tank or two.
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seen96Offline
Drag Slicks
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Drag Radials Suck on FWD.
1997 Grand Prix GT
Joined: 01 Oct 2003
Location: elbows deep in 4t65e
Age: 45
PostPosted: Thu May 01, 2008 4:58 pm    Post subject: Reply with quote

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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KC2GIWOffline
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Matt Antonio
1998 Grand Prix GTX
Joined: 11 Jun 2004
Location: SYR/ROC
Age: 24
PostPosted: Thu May 01, 2008 5:05 pm    Post subject: Reply with quote

So you get 15* of advance?
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loudgpOffline
Intercooled
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Greg
1996 Grand Prix GT
Joined: 03 May 2006
Location: Ny
Age: 43
PostPosted: Thu May 01, 2008 8:39 pm    Post subject: Reply with quote

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 )
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StonewallOffline
Supercharged
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Jerry Jackson
2006 Grand Prix GT
Joined: 17 Mar 2007
Location: Bloomfield/Rochester, NY
Age: 62
PostPosted: Fri May 02, 2008 2:02 pm    Post subject: Reply with quote

cruise at 50-70 in overdrive 40 to 47*. saw a couple blipps of 49.
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