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2004-2007 Cadillac CTS-V Performance Mods Discussion, Cruising AFR and Magie gas mileage in Cadillac CTS-V Series Forum - 2004 - 2007; Could be that he ignored making any changes to AFR maybe timing, too, at road-load conditions (i.e. part throttle cruise). ...
  1. #16
    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: Cruising AFR and Magie gas mileage

    Could be that he ignored making any changes to AFR maybe timing, too, at road-load conditions (i.e. part throttle cruise). I'm sure all he's got to do is obtain the data either by running on the dyno or even out on the streets, then tweak the tune at those conditions.

    An alternative would be for you to obtain the data for him while driving around and transmit the data file to him, have him tweak it, then send it back to for downloading into your ECM. Voila! You'd have to have an EFILive, HP Tuners, etc. to plug into your OBDII port and possibly a laptop ... I'm not very good at that stuff. Maybe Twitch will chime in again ... he's knows all about this stuff.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

  2. #17
    vetteboy2k is offline Cadillac Owners Fanatic
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    Re: Cruising AFR and Magie gas mileage

    I'd say let the same guy fix the early PE operation. Your tunes AFR looks spot on for WOT based on that dyno graph, and I'd trust that he could fix the issue. Theres tons of tables in the PCM and at times things can get missed, I wouldn't crucify the tuner so easily.

  3. #18
    CancerJCC is offline Cadillac Owners Connoisseur
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    Re: Cruising AFR and Magie gas mileage

    Quote Originally Posted by vetteboy2k View Post
    I'd say let the same guy fix the early PE operation. Your tunes AFR looks spot on for WOT based on that dyno graph, and I'd trust that he could fix the issue. Theres tons of tables in the PCM and at times things can get missed, I wouldn't crucify the tuner so easily.
    +1 Although I am in late on this thread I have to say that the tuner did what he was supposed to do, make power. Perhaps he should have taken the initiative and asked a few more questions about power vice economy but assuming someone desires max power is not so crazy.

  4. #19
    junoreactor's Avatar
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    Re: Cruising AFR and Magie gas mileage

    I'm scheduled to go back next week sometime. He said it should be an easy fix, perhaps something got overlooked by accident. I can't wait to see the new mpg; another $50 today from yesterday's small road trip.

  5. #20
    Twitch's Avatar
    Twitch is offline Cadillac Owners Connoisseur
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    Re: Cruising AFR and Magie gas mileage

    Good luck. Get a copy of the tune on a disc, or even email. Then you can have someone look it over if you not satisfied.
    '05 Platinum l LPE CAI l Magnaflow l V1 (hardwired), w/ custom mount l UUC shifter l UUC Alcantara shift knob l K9 GEAR rear seat cover lHID fogs lHotchkis sways lCG-Lock l Specter Bushings l FG2s l Ground control 550/600 l MAGGIE 439RWHP/414RWTQ (Dynojet) l Heavys fire extinguisher bracket l Interceptor scan-gauge l Billet pedals l Meth l NO HEADERS l Original diff l 90mm upgrade l 2.6" drive pulley l LS7 clutch w/16lb. FW l Alcantara

  6. #21
    bobh is offline Cadillac Owners Member
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    Re: Cruising AFR and Magie gas mileage

    I'm in the process of repairing my 04 CTS-V and have two options for the motor. A stock LS6 with headers and exhaust or a LS6 with a magna charger, 2.8 pullies, 60lb injectors, ported heads and dyno tuned. My question isn't so much about power output but MPG.
    Can someone post real time MPG numbers for each set-up? Highway and city. I really don't need another gas hog already have a driveway. Don't think I could enjoy the car too much if it's eating fuel( less then 20 mpg hwy) less than 15 city
    thanks
    BobH

  7. #22
    junoreactor's Avatar
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    Re: Cruising AFR and Magie gas mileage

    Providing your tune is right, unlike mine, you'll definitely be over 20mpg on the highway. When you are not under boost, the maggie is pretty efficient mpg wise. They even advertise it as having stock characteristics under normal driving. I'll be posting up my numbers after I get a tune anyway. Going up a moderate PA mountain with my wonky tune at perhaps 25% throttle I was hitting 5 MPG in 4th gear at crusing speed LOL.

  8. #23
    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: Cruising AFR and Magie gas mileage

    Quote Originally Posted by bobh View Post
    I'm in the process of repairing my 04 CTS-V and have two options for the motor. A stock LS6 with headers and exhaust or a LS6 with a magna charger, 2.8 pullies, 60lb injectors, ported heads and dyno tuned. My question isn't so much about power output but MPG.
    Can someone post real time MPG numbers for each set-up? Highway and city. I really don't need another gas hog already have a driveway. Don't think I could enjoy the car too much if it's eating fuel( less then 20 mpg hwy) less than 15 city
    thanks
    BobH
    When I went to headers/tune, I lost about 2 MPG highway (26 to 24) and about 1-1.5 overall.

    With my current setup, I drove to V-Day I back in May '07 (480 miles one way) at a steady 65 MPH (with cruise control) and got 24.5 MPG and same thing on the way home ... that included some Pennsylvania mountains, too. Just normal mixed driving, and I'm getting 18 to 20 depending upon whether I dip into the maggie once or twice during that tankfull.

    Your mileage may vary.
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

  9. #24
    CancerJCC is offline Cadillac Owners Connoisseur
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    Re: Cruising AFR and Magie gas mileage

    Quote Originally Posted by rand49er View Post

    Your mileage may vary.
    You got it Randy. Unless you are talking strictly open highway, steady state cruising, then everyones will be different. Even then your 65 on cruise is going to be a lot different than my 90 +- 5 mph...

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