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gas mileage... and coil pack

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Old 05-12-2013, 09:06 AM   #1
Toadster
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Exclamation gas mileage... and coil pack

So we did a full service on our 2000 Convertible 5-spd

still getting really bad gas mileage
did new plugs and wires - but the ignition seems fine, do coil packs just get bad on these cars? I don't really want to spend $90 if it's not going to add any benefit

it seems like a simple enough install, 4 screws and 7 plugs - right?
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Old 05-12-2013, 09:35 AM   #2
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IIRC my screaming demon coil was like $70, what is bad gas milage to you?
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Old 05-12-2013, 11:28 PM   #3
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Quote:
Originally Posted by mustangman02232 View Post
IIRC my screaming demon coil was like $70, what is bad gas milage to you?
13.7mpg

that's worse than my E55 AMG
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Old 05-13-2013, 06:46 AM   #4
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What kind of driving? I see your in Cali is there a lot of stop and go?

Have you done the fuel filter and air filter
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Old 05-13-2013, 06:58 AM   #5
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How are you measuring fuel mileage? Remember when your gauge reads empty there is still a little bit of fuel left in the tank. Fill it up completely, and before you leave the station record your mileage. On your next fill up, fill the tank completely and make a note of how many gallons it took to fill again and what your current mileage is and do the math again.
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Old 05-13-2013, 09:17 AM   #6
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Originally Posted by mustangman02232 View Post
What kind of driving? I see your in Cali is there a lot of stop and go?

Have you done the fuel filter and air filter
we live in Cali, but nothing like LA traffic he's pretty much driving to school and around town - probably 90% city driving

fuel filter was done with the full service and the air filter is brand new

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How are you measuring fuel mileage? Remember when your gauge reads empty there is still a little bit of fuel left in the tank. Fill it up completely, and before you leave the station record your mileage. On your next fill up, fill the tank completely and make a note of how many gallons it took to fill again and what your current mileage is and do the math again.
yes, measuring the amount of gas vs the miles driven, here's the app I've been using for one of my other cars..


Last edited by Toadster; 05-13-2013 at 11:04 AM.
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Old 05-13-2013, 11:08 AM   #7
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so in regards to the coil pack, that's pretty much the only thing we haven't replaced - the car has ~145k miles on it

have you guys seen improvements swapping this out?

there's no stuttering or hesitation (that I'm aware of)

Last edited by Toadster; 05-13-2013 at 11:27 AM.
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Old 05-13-2013, 04:52 PM   #8
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I take it you put new plugs in with this service. Only thing that i'd recommend personally is dumping a bottle of Lucas injector cleaner with your next tank. For five bucks, can't really call it a risk. Especially if the car has gone through so many miles.

I can't say much for the coil pack because I never put a new one in since I got the car in the first place last year and I swapped for just a new BWD pack. I did always wanted to get the MSD one though.. It could make a difference, but not sure.
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Old 05-13-2013, 07:57 PM   #9
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I take it you put new plugs in with this service. Only thing that i'd recommend personally is dumping a bottle of Lucas injector cleaner with your next tank. For five bucks, can't really call it a risk. Especially if the car has gone through so many miles.

I can't say much for the coil pack because I never put a new one in since I got the car in the first place last year and I swapped for just a new BWD pack. I did always wanted to get the MSD one though.. It could make a difference, but not sure.
yes, my son and I installed the plugs and new wires - we put a bottle of injector cleaner in the tank prior to the plugs

I ordered the MSD coil and a bottle of Cataclean from American Muscle
http://www.americanmuscle.com/prestolite-cataclean.html

hopefully this weekend we'll get it swapped out and be able to report back!

Last edited by Toadster; 05-13-2013 at 08:03 PM.
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Old 05-14-2013, 10:51 PM   #10
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ugh, just filled up 161.4 miles and 12.13 gallons (13.3mpg) and he drives VERY conservatively

http://www.fuelly.com/driver/ryan96/mustang

I'm starting to wonder if the 20" wheel/tire setup is not logging as many miles as needed...

245/35-R20 tires

using a tire size calculator - the 205/65-15 (oem) vs the 245/35-20

the 20" tires will make the speedo 4.9% too slow, so when the speed reads 60mph - we're actually going 63mph
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Old 05-15-2013, 09:37 AM   #11
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That is going to make a big difference in your calculations.
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Old 05-15-2013, 10:49 AM   #12
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Quote:
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That is going to make a big difference in your calculations.
i agree, I have an SCT programmer and need to recalibrate the tire size and tune the car - but need to find some time, will have to get the ECU code in the footwell panel since the one on the passenger door is worn off...

anyone know a rough conversion for the mileage before I can retune?
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Old 05-15-2013, 02:23 PM   #13
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Quote:
Originally Posted by Toadster View Post
ugh, just filled up 161.4 miles and 12.13 gallons (13.3mpg) and he drives VERY conservatively

http://www.fuelly.com/driver/ryan96/mustang

I'm starting to wonder if the 20" wheel/tire setup is not logging as many miles as needed...

245/35-R20 tires

using a tire size calculator - the 205/65-15 (oem) vs the 245/35-20

the 20" tires will make the speedo 4.9% too slow, so when the speed reads 60mph - we're actually going 63mph
That just means to odometer is off by 4.9% too.

161.4 x 1.049 = 169.3 actual miles.

divide by 12.13 gallons and get 13.9mpg.

The 20" wheels typically weigh significantly more than stock and put most of that weight far away from the center of the wheel, which means a much larger moment of inertia. This means it takes a lot more fuel just to accelerate them up to speed. Big wheels typically translate to lower city mileage (lots of starting and stopping, when high moment of inertia hurts you), constant speed highway mileage shouldn't be affected much.

What do other people get with these convertibles? We haven't driven ours enough to know.
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Old 05-15-2013, 02:38 PM   #14
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Quote:
Originally Posted by Toadster View Post
ugh, just filled up 161.4 miles and 12.13 gallons (13.3mpg) and he drives VERY conservatively

http://www.fuelly.com/driver/ryan96/mustang

I'm starting to wonder if the 20" wheel/tire setup is not logging as many miles as needed...

245/35-R20 tires

using a tire size calculator - the 205/65-15 (oem) vs the 245/35-20

the 20" tires will make the speedo 4.9% too slow, so when the speed reads 60mph - we're actually going 63mph
The 20" wheels is the biggest problem. They are probably heavier than stock and with the slightly larger diameter you are exponentially increasing rotational mass. Rotational mass is part of your drivetrain loss/resistance. When you step on the gas the engine has to overcome the drivetrain loss/resistance to get the car moving. This uses more fuel.

Almost everyone notices a drop in mpg when they switch to 20" wheels, especially when stock is 15"! With stop and go driving (90% city) that extra rotational mass is like dragging around an anchor. if you still have the stock wheels, swap them for a tank and see the difference!
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if you are getting 29mpg in your 5.0, you aren't driving it correctly
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Old 05-15-2013, 02:39 PM   #15
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Quote:
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That is going to make a big difference in your calculations.
Not really. 5% difference is height is probably less than 5% difference in MPG. The wheel size and driving conditions in this case are the biggest negative factors to MPG.
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if you are getting 29mpg in your 5.0, you aren't driving it correctly
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Old 05-15-2013, 04:01 PM   #16
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I would put the stockers on and see what you get as mentioned, city my 02 never did that good, like 16-17.... My GT actually gets better fuel milage then my v6 ever did
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Old 05-15-2013, 05:43 PM   #17
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These V6's do not really get that good of mpg's anyhow, let alone much larger wheels. GT or other V8 model guys sometimes will say well you got a v6 I bet you at least get decent fuel mileage and I have to reply no, in honesty the v8's do get just as good if not better fuel mileage in many cases. I think I average between 15-17 in town/city, and about 24-25 highway. I don't drive conservative really though.
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Old 05-15-2013, 06:52 PM   #18
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Quote:
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I would put the stockers on and see what you get as mentioned, city my 02 never did that good, like 16-17.... My GT actually gets better fuel milage then my v6 ever did
I wish we could, the 20's came on the car...

so we're shopping around for some smaller/lighter wheel/tire combos
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Old 05-15-2013, 07:34 PM   #19
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I like putting newer, OEM wheels on. I bought these for our '01:

Click the image to open in full size.

They are from an '05 GT (?). They fit pretty well with no spacers, but there is a little rubbing on sharp turns.

They changed the backspacing for the '05+ Mustangs, so you have to watch that if you get newer wheels.
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Old 05-15-2013, 08:08 PM   #20
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I am dense sometimes its true...but I dont see how a coil pack could affect mpg. I mean a coil pack either works and fires the plugs or it doesn't and you get nowhere.
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Old 05-15-2013, 08:08 PM
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