my gas mileage went down with the stock 3.27's. - TCCoA Forums
 
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post #1 of 20 (permalink) Old 10-05-2010, 10:10 AM Thread Starter
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my gas mileage went down with the stock 3.27's.

Not sure if it belongs here or the tunning forum but I just recently replaced my 4.10's T-Lock for the stock 3.27's open diff. The good news is that I can still spin both tires when power braking but it seems like my gas millage went down with the stock 3.27's.

I believe my car is tuned for 89, 91 and I have another tune for 87 when I had pigging issues. The current tune is for 89 with the 4.10's.

I do run 87 octane on the 89 tune but I have for a while and I used to get 250 miles now it seems like I'm getting 200 miles per tank. When it was stock I used to get 300 miles per tank.

The only other mod I have done is the True duals exhaust everyone else got.

What could be causing me to lose more gas millage?

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #2 of 20 (permalink) Old 10-05-2010, 12:04 PM
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Are the shift points recalibrated?

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post #3 of 20 (permalink) Old 10-05-2010, 12:58 PM Thread Starter
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Originally Posted by Rodeo Joe View Post
Are the shift points recalibrated?

Joe
The only thing I recalibrated was the speedometer, so no.

This is really confusing me because the car drives fine and it still fast
The RPM's are lower now with the 3.27's in the car.

I may throw on the stock MAF and run the stock tune to see if I get my mileage
back.

Edit. Any one know If I can set my own shift points just with the device
And what would the proper shift points be for 3.27 gears?



Thanks

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.

Last edited by cjchevez; 10-05-2010 at 01:48 PM.
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post #4 of 20 (permalink) Old 10-05-2010, 07:25 PM
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Is this a lot of city driving? 3.27s will increase your highway mileage and decrease your city mileage compared to 4.10s.

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post #5 of 20 (permalink) Old 10-05-2010, 08:25 PM Thread Starter
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Is this a lot of city driving? 3.27s will increase your highway mileage and decrease your city mileage compared to 4.10s.
I do mostly freeway, it might be like 20 miles on the freeway and 5-10 miles
on the streets.

Are my shift points off that much ?




1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #6 of 20 (permalink) Old 10-20-2010, 09:47 PM
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Don't know if you ever figured this out but you should be able to adjust the shiftpoints on your sct handheld. It goes by MPH instead of rpm. You should be shifting at 2000 rpm or so just normal driving below 40 percent throttle.

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post #7 of 20 (permalink) Old 10-20-2010, 10:12 PM Thread Starter
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Originally Posted by paintme205 View Post
Don't know if you ever figured this out but you should be able to adjust the shiftpoints on your sct handheld. It goes by MPH instead of rpm. You should be shifting at 2000 rpm or so just normal driving below 40 percent throttle.
Well, now I am running the stock tune so the shifts are now where they should be.
I'm not sure that the stock tune is helping that much. I do feel like I lost that get the **** out of my way tune / feeling I got from the tune

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #8 of 20 (permalink) Old 10-23-2010, 08:47 AM
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I've noticed on my 97 Thunderbird with a 3.27 open diff and a stock tune that I average 19mpg combined on 91 non oxygenated. If I'm on the freeway, I get 27-28 with good gas. If I go down to 89 I lose 2mpg, and on 87 I lose 3mpg I think primarily due to the 10%ethanol in the gas. Even on 91 oxygenated, I only get 18mpg combined.

Now in one of your earlier posts, you said you recalibrated your speedometer for the 4.10 gears, did you calibrate it back for the 3.27's? If not the odometer would be way off and account for some of your loss, but I'm going to guess you didn't leave the 4.10 speedo gear in there.
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post #9 of 20 (permalink) Old 10-23-2010, 12:03 PM Thread Starter
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Quote:
Originally Posted by Woodman View Post
I've noticed on my 97 Thunderbird with a 3.27 open diff and a stock tune that I average 19mpg combined on 91 non oxygenated. If I'm on the freeway, I get 27-28 with good gas. If I go down to 89 I lose 2mpg, and on 87 I lose 3mpg I think primarily due to the 10%ethanol in the gas. Even on 91 oxygenated, I only get 18mpg combined.

Now in one of your earlier posts, you said you re calibrated your speedometer for the 4.10 gears, did you calibrate it back for the 3.27's? If not the odometer would be way off and account for some of your loss, but I'm going to guess you didn't leave the 4.10 speedo gear in there.



I re calibrated the speedometer using my speed-cal and I returned to stock tune using my xcal 2. I also had to go back to the stock maf sensor since thats what the stock tune runs.

I think your right about th 87 octane, next fill up I'm going to go with 91 and see what happens.

Thanks

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #10 of 20 (permalink) Old 10-23-2010, 12:40 PM
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Quote:
Originally Posted by cjchevez View Post
I re calibrated the speedometer using my speed-cal and I returned to stock tune using my xcal 2. I also had to go back to the stock maf sensor since thats what the stock tune runs.

I think your right about th 87 octane, next fill up I'm going to go with 91 and see what happens.

Thanks
I'm not very knowledgeable about how the speed-cal works, so bear with me here. I am under the impression that a gear drives the speed sensor, and then that tells the electronic gauges and odometer how to behave. If it's all electrical based on the gear, and the speed-cal translates it properly, then all should be good... but if say the odometer is mechanically driven, and I have no idea if it is or not, still learning on the Thunderbirds, then it could still possibly be wrong even though the speedometer is reading correctly.

I'll let one of the guys who knows more say for sure, but other than gas alone, that could be an issue.
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post #11 of 20 (permalink) Old 10-23-2010, 01:43 PM
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The speedo and odometer are both electric and driven by the same signal, so if the speedo is correct then the odometer will be as well, assuming it still has functional gears.

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post #12 of 20 (permalink) Old 10-23-2010, 06:49 PM
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Quote:
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The speedo and odometer are both electric and driven by the same signal, so if the speedo is correct then the odometer will be as well, assuming it still has functional gears.
Good to know. Thanks.
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post #13 of 20 (permalink) Old 10-23-2010, 07:04 PM
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Quote:
Originally Posted by cjchevez View Post
The only other mod I have done is the True duals exhaust everyone else got.

What could be causing me to lose more gas millage?

I didnt know that everybody had dual exhaust .. weird.

Oh and yes it can affect your fuel economy in a negative way. All else being stock - stock EEC, stock gears, etc .. as long as you gave your computer time to "learn" before you started calculating the mileage.

Dont feel too bad, I only get 10 mpg in my SC.
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post #14 of 20 (permalink) Old 10-23-2010, 08:00 PM Thread Starter
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1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #15 of 20 (permalink) Old 10-24-2010, 08:47 AM
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I didnt know that everybody had dual exhaust .. weird.

Oh and yes it can affect your fuel economy in a negative way. All else being stock - stock EEC, stock gears, etc .. as long as you gave your computer time to "learn" before you started calculating the mileage.

Dont feel too bad, I only get 10 mpg in my SC.
I was under the impression that our computers didn't "learn" so much as just follow their basic program or go into limp home mode.
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post #16 of 20 (permalink) Old 10-24-2010, 01:00 PM
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Did you just spam your own thread? lol

Delete my account.
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post #17 of 20 (permalink) Old 10-24-2010, 02:00 PM
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I was under the impression that our computers didn't "learn" so much as just follow their basic program or go into limp home mode.
You must know more than I do .. I thought the OBD2 systems had to set monitors and go into closed loop operation to adjust the air / fuel mixture ...

And what does MMA have to do with anything drivetrain related ???

Ill stop talking and let you guys go back to watching sweaty men ...
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post #18 of 20 (permalink) Old 10-24-2010, 03:37 PM Thread Starter
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Originally Posted by SCTbird1994 View Post
I didnt know that everybody had dual exhaust .. weird.
Oh and yes it can affect your fuel economy in a negative way. All else being stock - stock EEC, stock gears, etc .. as long as you gave your computer time to "learn" before you started calculating the mileage.

Dont feel too bad, I only get 10 mpg in my SC.
http://forums.tccoa.com/showthread.php?t=118883 exhaust link
Thats pretty crappy mileage.
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Originally Posted by 94 Thunderbird XX View Post
Did you just spam your own thread? lol
Yes ,so that I wouldnt have to reply to the I got before yours.

Quote:
Originally Posted by SCTbird1994 View Post

And what does MMA have to do with anything drivetrain related ???


Ill stop talking and let you guys go back to watching sweaty men ...

Its a free forum do what you like ohh and why the hate

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #19 of 20 (permalink) Old 10-24-2010, 06:59 PM
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Ehh .. too many variables to take into account - all of your engine mods, custom tune, etc .. driving conditions and driver behavior.

@ 20+ MPG seems average for a 10+ year old , 100k miles 4.6 Tbird .. they get a little worse with higher mileage.

I wasnt hating, you just missed the joke ..
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post #20 of 20 (permalink) Old 10-25-2010, 12:12 PM
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^^Gas mileage has always gotten better for me the older the car got, even with 200k+ miles. Definately has not gone down.

Al

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94 Supra TT Auto - street/strip car
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Previous Fords:
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
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