Lets talk MPG

Posted: Tue Apr 29, 2008 8:12 am Post subject: Lets talk MPG

What are you guy's running for timing at cruise?

Mine is only low 30's right now, want to bump it up but not sure how high to go.
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'08 TrailBlazer SS Black/Black

Posted: Tue Apr 29, 2008 9:47 am Post subject:

37* from 1600-2400 & trailing off to 16* by 3600+... didn't make a huge change, but can't hurt.

- Dave
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2004 Regal GSX - YouTube channel Stattama T67BB, A2W IC, ST5, heads, L32, GMR diff/chain (11.46 w/ Z7 T66, IS3t cam)
2006 Grand Prix GXP - K&N intake and mufflers only, basically stock for me
2012 F-150 EcoBoost SuperCrew 4x4 - stock DD and roadtrip vehicle
1998 Daytona GTP #838 - I/C*d MP112 L26 - Rust in Peace, engine saved

Posted: Tue Apr 29, 2008 10:07 am Post subject:

Dave what are you thoughts about leaning out a/f a bit to say 15.0-15.1?

Posted: Tue Apr 29, 2008 11:13 am Post subject:

Our tuners don't show enough of the pcm's tables to properly do that. Unfortunately the A/F changes end up affecting things in PE, since somehow it's using closed loop as a reference or zero point. (Someone alot smarter than me explained this in a chat once.)

In reality, the car seems to run in the 15.0 range or so on widebands, due to inaccuracy of the stock O2 over time (not a bad thing, Holdens have a mode that occassionally sees 17:1). Also, that NB sensor is only meant to try keeping your car in the 14.7 area, so shifting that may affect steadiness of the A/F.

- Dave

Posted: Tue Apr 29, 2008 11:42 am Post subject:

good info, I might try and mess with it a bit to see what happens.

Posted: Tue Apr 29, 2008 12:33 pm Post subject:

Jay, that timing table u gave me a few years ago had me running 42* timing while cruising on the highway, mpg was great. i need to swing out ur way to get that table again. it had 19* @ WOT too Very Happy

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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: Tue Apr 29, 2008 1:52 pm Post subject:

Yeah that table was nice. I need to upload it to my file. The one I have now is so-so.

We do have to meet up, I want to show you the new front mount I put on. Nicer than the jegs rad I had before.

Posted: Tue Apr 29, 2008 4:25 pm Post subject:

Like I was telling you Jay, you should check out that '04+ GTPs timing tables. They're running up to 50degrees adv. I'm running with 41~45degrees advance. Awsome throttle response and great MPG. I wouldnt mind doing some driving/scans and see if I can get it up to 50 degrees advance.
Laughing

instead of seeing who can go faster, these days we're gonna see who can get the best mpg.
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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: Tue Apr 29, 2008 6:24 pm Post subject:

dave in right,

you guys should get a t56 2 over drive gears gets great highway milage
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New Era performance

01z28, M6 NA, mullet, T tops, siqqqq

Posted: Tue Apr 29, 2008 6:42 pm Post subject:

Posted: Wed Apr 30, 2008 9:05 pm Post subject:

Checked mine out, 40*+ are common when cruising.

Studderin any hope for a 4L60E 4000 stall and MPG? opps I've said to much.....
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Best Formula N-A 12.1 @ 110 (pre-engine swap)

Posted: Thu May 01, 2008 8:42 am Post subject:

soo yeah, i'm thinking vs cam, stock t-stat, stock spark plugs, decent tune and keep my 3.25" and see what kinda mpg i can get this summer. i figure the vs would be better than stock due to the low end power.

Posted: Thu May 01, 2008 10:18 am Post subject:

IM going back up to a 180 t-stat (when I find my old one) plugs and clean filter this weekend. IM hoping to see 30+ after some tuning. Right now im seeing 24 average with year old 104's, 160 t, dirty filter, 29-30 timing and no EGR. A/F is high 14's on the highway

Posted: Thu May 01, 2008 10:25 am Post subject:

Posted: Thu May 01, 2008 10:27 am Post subject:

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