Gas Milage w/ PI head swap - TCCoA Forums
 
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post #1 of 11 (permalink) Old 09-03-2006, 11:27 PM Thread Starter
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Gas Milage w/ PI head swap

I'm trying to see what other people that have done the complete PI swap (Heads/Cams/Intake) are getting.

I have done the full PI swap(Heads/Cams/Intake)
Marauder T/C
'02 GT MAF w/ air tube
3.27 posi rear
Rebuilt Trans (300miles now on it)
Performance Lonnie Tune
- 180* t-stat
- 12C plugs


I don't think my gas milage is very good.

I'm having a miss problem that I posted about in another thread. [That might have something to do with this.]
I already replaced the fuel filter, air filter is brand new, PCV valve is new, new plugs.

Car has 113,000 on it but only 300miles since PI swap and tune.
No codes.
Ran like a beast with great gas milage before all of this.
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post #2 of 11 (permalink) Old 09-04-2006, 04:40 PM
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My previous setup was identical to yours (except 3.55 gears) and I got 25 mpg on the highway.

'97 Sport Option'd T-Bird
DSS Shortblock, PI Heads, 262AH Cams, Kooks, SVO SC with stock pulley,
42 lb injectors, 70mm TB, '02 GT MAF, Vogtland Springs, Mk VIII DS,
Marauder TC, 17" SVT T-Bird Rims, Michelin PS2 235/50/17, True Duals,
4.10 gears, J-modded tranny
300RWHP 335RWTQ
Member of www.midwestthundercats.com

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post #3 of 11 (permalink) Old 09-04-2006, 06:03 PM
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I get 25mpg highway, 20 city with 3.73's and a 3800 stall TC instead of what you have.

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R.I.P. Johnny Langton 1975-2011

1997 Thunderbird LX 4.6 AED 349.27RWHP/391.29RWTQ Engine Build Exterior shots
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post #4 of 11 (permalink) Old 09-04-2006, 06:44 PM
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well first of all, fix your miss....no sense in speculating about your crappy gas mileage until you fix it

with that setup you should be getting anywhere from 14-20 mpg city, and at least 25-27 mpg hwy....once everything is up to par

you could easily be off by a tooth on a cam sprocket and be out of time on the chains....done a compression check?
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post #5 of 11 (permalink) Old 09-04-2006, 07:11 PM
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A lot also depends on how you drive the car. I CAN get 20 mpg with my explorer motor with SVO blower but not if I romp on it from light to light

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post #6 of 11 (permalink) Old 09-04-2006, 08:02 PM Thread Starter
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Quote:
Originally Posted by guitar maestro
you could easily be off by a tooth on a cam sprocket and be out of time on the chains....done a compression check?
No not yet.
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post #7 of 11 (permalink) Old 09-05-2006, 12:50 PM
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Same here, my gas mileage is not impressive either after the performance tune no matter how much I baby it. Stock tune gets me about 1~2MPG more so far in the city. Highway seems to do about the same to 1MPG more with the tune, haven't had it much on the highway to confirm, buts its definately not 25+ like some people are getting. Performance tune gave a bit more midrange power and fixed the shift points, otherwise it ain't doing for me either.
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post #8 of 11 (permalink) Old 09-05-2006, 03:23 PM
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For the miss ....


Im guessing you need new sparkplug wires if you didnt change em yet .

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; 09-05-2006 at 03:28 PM.
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post #9 of 11 (permalink) Old 09-05-2006, 03:26 PM
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I'd think O2 sensors actually, they do get worn out and if they are the factory ones they are almost 10 years old. I've never had wires give me any difference fuel economy wise.

R.I.P. Joel Bender 07/30/79 - 03/26/06
R.I.P. Johnny Langton 1975-2011

1997 Thunderbird LX 4.6 AED 349.27RWHP/391.29RWTQ Engine Build Exterior shots
2002 Thunderbird Premium Triple Black 3.9
2015 Fusion Energi SE Luxury Magnetic Gray
*SCRAPPED* 1994 LX 4.6 NA [email protected] 236.07RWHP/286.26RWTQ
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post #10 of 11 (permalink) Old 09-05-2006, 06:40 PM
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So it was the wires ?

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 #11 of 11 (permalink) Old 09-05-2006, 07:49 PM Thread Starter
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Quote:
Originally Posted by cjchevez
So it was the wires ?
Yup!



I'm going to watch the fuel gauge the next few days to see if my milage increases. I might get those O2 sensors too; (just cause I got a friend at the auto parts store that can get me a "great deal" on them )
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