The Definitive Injector Swap HOW TO - Page 39 - JeepForum.com
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post #571 of 675 Old 12-10-2013, 03:20 PM
Football47
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Originally Posted by PolkaPower View Post
Going by the trip computer is a very inaccurate way to determine MPG. It's never correct.
Yeah but its saying I'm getting 16.6mpg now, and with my stock ones I got 18.3mpg.... the upgraded injector must not be as good as my one hole stock injectors...


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post #572 of 675 Old 12-10-2013, 03:27 PM
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Or the computer hasn't learned yet. Did you unplug the battery?
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post #573 of 675 Old 12-10-2013, 05:08 PM
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Yeah but its saying I'm getting 16.6mpg now, and with my stock ones I got 18.3mpg.... the upgraded injector must not be as good as my one hole stock injectors...
You should never go by the overhead. They especially lie when you do a 703 swap. If you never hand calculated your MPGs before, you'll never know what kind of difference they actually make other than maybe a few more/less miles per tank.

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post #574 of 675 Old 12-11-2013, 01:04 AM
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Or the computer hasn't learned yet. Did you unplug the battery?
No I haven't... you're talking about the main battery right? Not something unique that specifically goes to the computer right?

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post #575 of 675 Old 12-11-2013, 01:06 AM
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You should never go by the overhead. They especially lie when you do a 703 swap. If you never hand calculated your MPGs before, you'll never know what kind of difference they actually make other than maybe a few more/less miles per tank.
This one actually was spot on with the overhead since I hand calculated the mpg myself before. Good to know though.

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post #576 of 675 Old 12-11-2013, 04:03 AM
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Going by the trip computer is a very inaccurate way to determine MPG. It's never correct.

Agreed. I always reset mine after I've worked on the engine. When I swapped in the junkyard 703s, I went from 12.5 (previous reading) to 22.3 (after intake and injector swap). Its reading 19.7 now, but I think that's more because Indiana people drive 10mph when it's snowing.
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post #577 of 675 Old 12-11-2013, 04:10 AM
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My OVHD display reads 15.5 mpg. But I have an excel spreadsheet that I created where I calculate my mpg. I am no where near the 15.5 mpg now that winter is upon us.

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post #578 of 675 Old 12-11-2013, 05:30 AM
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Agreed. I always reset mine after I've worked on the engine. When I swapped in the junkyard 703s, I went from 12.5 (previous reading) to 22.3 (after intake and injector swap). Its reading 19.7 now, but I think that's more because Indiana people drive 10mph when it's snowing.
Hey now... Not all Hoosiers are bad drivers. I'll admit, I don't speed more than maybe 5 mph over the speed limit and exactly the speed limit in neighborhoods; that does piss off some people. This morning I was one of the fastest on the highway in my ZJ going 5 under because of the snow. I've been commuting to Chicago every morning for work. That's with Illinois drivers.

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post #579 of 675 Old 12-11-2013, 07:35 AM
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Hey now... Not all Hoosiers are bad drivers. I'll admit, I don't speed more than maybe 5 mph over the speed limit and exactly the speed limit in neighborhoods; that does piss off some people. This morning I was one of the fastest on the highway in my ZJ going 5 under because of the snow. I've been commuting to Chicago every morning for work. That's with Illinois drivers.
I agree about Illinois drivers. I have a 1.5hr commute from where I live and TMMI one way. I ain't got time for slow drivers
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post #580 of 675 Old 12-11-2013, 08:58 AM
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If you do the math, 55 vs 65 over 100 miles only saves you 10 minutes. Speeding, unless you're going a long distance, doesn't get you anything other than frustrated with the dude in front of you who's going the speed limit and possibly a ticket. Look at me, I'm talking like an old fart...

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post #581 of 675 Old 12-11-2013, 09:13 AM
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Originally Posted by ejschultz View Post
If you do the math, 55 vs 65 over 100 miles only saves you 10 minutes. Speeding, unless you're going a long distance, doesn't get you anything other than frustrated with the dude in front of you who's going the speed limit and possibly a ticket. Look at me, I'm talking like an old fart...
It's actually 17 minutes.

100 m / 55 mph x 60 min/hr = 109 min
100 m / 65 mph x 60 min/hr = 92 min

Assuming that's a one way the time savings is almost 3 hours (2.8) per week.
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post #582 of 675 Old 12-11-2013, 09:48 AM
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If you do the math, 55 vs 65 over 100 miles only saves you 10 minutes. Speeding, unless you're going a long distance, doesn't get you anything other than frustrated with the dude in front of you who's going the speed limit and possibly a ticket. Look at me, I'm talking like an old fart...
Forgot to factor in the trains that cut 3 of the town's in half. Timing is everything, but 60mph means the difference between ahead of the train and on time, or 20 minutes late because the same train goes through all 3 towns.
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post #583 of 675 Old 12-11-2013, 11:17 AM
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It's actually 17 minutes.

100 m / 55 mph x 60 min/hr = 109 min
100 m / 65 mph x 60 min/hr = 92 min

Assuming that's a one way the time savings is almost 3 hours (2.8) per week.
Yeah. I failed there. If I wrote it out I would have realized I ended up with 1.82 and 1.54 hours, respectively, for the trips. My brain has been in an extreme lack of sleep for the last 15 months or so and it's been worse the last 2 months. If I would have slowed down a little I would have caught my mistake. Regardless, that's assuming you have a 100 mile trip. Most of the a-holes that get on the interstates around here only commute a few miles, 30 miles max. To make a difference there, you'd have to be flying.

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post #584 of 675 Old 12-12-2013, 03:11 PM
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I did this method for resetting the ECU this morning:
Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds.

Reconnect the Battery Cable
Turn Ignition Switch to the “ON” position
Turn Headlight “ON”
Turn Headlights “OFF”
Turn Ignition Key “OFF”

My gas mileage is down to 15.7mpg which it's never been so low. I think my ECU was reset since my radio preset channels were swiped clean, but who knows.

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post #585 of 675 Old 12-13-2013, 03:44 AM
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Originally Posted by SpectralZJ98 View Post
Agreed. I always reset mine after I've worked on the engine. When I swapped in the junkyard 703s, I went from 12.5 (previous reading) to 22.3 (after intake and injector swap). Its reading 19.7 now, but I think that's more because Indiana people drive 10mph when it's snowing.
Intake swap? Link please

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