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Savvy FOX IFP 4" Lift Shocks in StockSavvy/Currie Aluminum Control ArmsSavvy Aluminum Gas Tank Skid

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Unread 11-26-2013, 11:03 AM   #27601
smccloud
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1997 ZJ 
 
Join Date: Sep 2010
Location: Becker, MN
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Quote:
Originally Posted by comptiger5000 View Post
I did the math recently, and in almost 4 years and about 59k miles since I bought my ZJ, I've spent close to $15k on fuel
I've had my ZJ for around 5 years, wife put most of the miles on it, but in those 5 years it has had around 100k miles put on it

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Unread 11-26-2013, 11:09 AM   #27602
95z
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90k in 2.5 years! Don't even wanna know given most of the gas was $4+ a gallon. Close to $5 for a while. E
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Unread 11-26-2013, 11:38 AM   #27603
PolkaPower
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Location: The Abyss, Italy
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Quote:
Originally Posted by AnotherRedZj View Post
Every time I hand calculate my mpg it's within 1 mpg of my overhead. I haven't swapped my Speedo gear yet either.......sooo 31's on a BB with a 5.2 = crummy gas mileage!
Have you fixed your plenum yet? I get between 13-15 going 70-80 mph. I can eek out better not going above 65 but that drives me nuts after a while. 2" lift with 245/75's, 5.9.
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Unread 11-26-2013, 11:46 AM   #27604
ejschultz
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Quote:
Originally Posted by 95z View Post
I'll top it off and give you accurate numbers to further disconclude your statement.
Maybe I'm wrong but I have a feeling you're going to be in for a surprise when you actually calculate it. Whether or not you share that surprise on here truthfully is up to you.
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
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Unread 11-26-2013, 12:16 PM   #27605
95z
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Originally Posted by ejschultz View Post

Maybe I'm wrong but I have a feeling you're going to be in for a surprise when you actually calculate it. Whether or not you share that surprise on here truthfully is up to you.
Shhhhh.
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Unread 11-26-2013, 01:31 PM   #27606
SchizophrenicMC
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I always calculate my fuel consumption with the following formula:

(miles driven * tire correction factor)/gallons fuel

The correction factor is because I haven't regeared my speedometer so my odometer reads incorrectly. However it reads incorrectly by a given percentage. I believe I'm 12.5% low so I'd multiply by 1.125 to get the corrected mileage, then divide by the amount of fuel added. There's a good calculator on a Miata website that tells you how different your tire size is from stock, and how that affects your speedometer reading. It can compare any 2 tire/wheel size combinations. Very useful.

With that said, my overhead reads 1.5mpg lower than hand calculation using corrected mileage. 12.4mpg vs 14mpg. That's a lot of city driving and lead foot, on 2" of lift, 32" tires, and an I6 straining itself to go faster.
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Unread 11-26-2013, 02:00 PM   #27607
speedbucket
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Quote:
Originally Posted by SchizophrenicMC View Post
I always calculate my fuel consumption with the following formula:

(miles driven * tire correction factor)/gallons fuel

The correction factor is because I haven't regeared my speedometer so my odometer reads incorrectly. However it reads incorrectly by a given percentage. I believe I'm 12.5% low so I'd multiply by 1.125 to get the corrected mileage, then divide by the amount of fuel added. There's a good calculator on a Miata website that tells you how different your tire size is from stock, and how that affects your speedometer reading. It can compare any 2 tire/wheel size combinations. Very useful.

With that said, my overhead reads 1.5mpg lower than hand calculation using corrected mileage. 12.4mpg vs 14mpg. That's a lot of city driving and lead foot, on 2" of lift, 32" tires, and an I6 straining itself to go faster.
the way i did it before i got the right speedo gear/r&P ratio/tiresize to add up properly was to do the tire rolling circumference compared to factory percentage.
so a 33" tire circumference= 103.67"
stock 28.5 tall=89.5"
103.67/89.5=1.158 but well call it 1.16 (you've gon 16% farther due to larger rolling circumference)
multiply this times your tripometer to see how far you've actually gone
so trip says 300 miles
300x1.16 youve actually gone 348 miles
348/gallons pumped=MPGs

i get 13 to 14 mpg overall in this hoss
weighs over 5k lbs now and just turned 270k miles on the original motor---3rd tranny
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Unread 11-26-2013, 03:43 PM   #27608
ejschultz
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You guys know a speedo gear is like $40 shipped and maybe 5 minutes of labor, right? Or have you both changed them already?
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
14 JKU Sport S - Stock
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Unread 11-26-2013, 04:15 PM   #27609
speedbucket
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Originally Posted by ejschultz View Post
You guys know a speedo gear is like $40 shipped and maybe 5 minutes of labor, right? Or have you both changed them already?
when i did my gears and SYE i swapped the right one in. im off 1mph at 65, but its prety easy once youve done the math once. KNowing 16% you can guess your speed pretty well and just multiply it. I did the sye in the rear so with the suspension/axle swap i actually run the exact same driveshaft front and rear= carry one spare and easily available at the junkyards
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V8 zj at 6" . Double tri rear and true 3 link front. Stretched to 108"
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Unread 11-26-2013, 04:15 PM   #27610
PolkaPower
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What gear would be good for a 30.5" tire? Round up or down? I use the speedo on my GPS most of the time. The dash speedo is a bit slower than the GPS.
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Unread 11-26-2013, 04:35 PM   #27611
AnotherRedZj
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Quote:
Originally Posted by PolkaPower View Post

Have you fixed your plenum yet? I get between 13-15 going 70-80 mph. I can eek out better not going above 65 but that drives me nuts after a while. 2" lift with 245/75's, 5.9.
Yea, the crate came with a full gasket kit.

I'm about 13 in town, 15 on the highway. Any highway time is really pretty short trip so it might come out better if I used a whole tank.
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Unread 11-26-2013, 04:55 PM   #27612
ejschultz
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Quote:
Originally Posted by PolkaPower View Post
What gear would be good for a 30.5" tire? Round up or down? I use the speedo on my GPS most of the time. The dash speedo is a bit slower than the GPS.
Stock 3.73s? You need the ultra rare 33.5 tooth gear.
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97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, OEM skids/hooks/hitch, 31" Duratracs on 15x8s
14 JKU Sport S - Stock
Build
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Unread 11-26-2013, 06:53 PM   #27613
riot1987
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I trimmed my bumper for my new big meats

I took off a fair amount, I think they should clear now
p1030359.jpg   p1030266.jpg   p1030361.jpg   p1030363.jpg  
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Unread 11-26-2013, 06:54 PM   #27614
riot1987
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Also added some new beer holders. Spray rubbered my new cubby to help quiet it down, she was a noisy hoe.
p1030358.jpg  
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Unread 11-26-2013, 07:01 PM   #27615
970001zj
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broke the screw off in the distributor changing the cap


drilled the screw hole


question , is it safe to hold it on with zip ties ? :
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door latch , lift + spacers

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