The Definitive Injector Swap HOW TO - Page 38 - JeepForum.com

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post #556 of 675 Old 11-27-2013, 07:29 AM
BLarkin
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Are those the 703 injectors? If so, seems like a fair deal.

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post #557 of 675 Old 11-27-2013, 09:34 AM
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BLarkin: they are indeed 703s. Just bought a set from them for my wife's jeep the other day. I even sprung to have them flow matched to within 1%. Worth every penny
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post #558 of 675 Old 11-27-2013, 11:42 AM
ejschultz
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I'll have a set of 703s for an I6. They're impedance matched but not flow matched. They have about 3000 miles on them since the rebuild. My buddy (todd4198 on here) wanted to swap back to the 778s as an experiment. He's not planning on swapping the 703s back in. They're 100% functional. PM me for more info.

97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, bumpers, bunch o' skids, 31" Duratracs on 15x8s
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post #559 of 675 Old 12-03-2013, 03:54 AM
Football47
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Think I found some decent injectors... what do you guys think? http://www.ebay.com/itm/96-97-98-Jee...9ef509&vxp=mtr I think they are flow matched Bosch 778s, I want injectors that will give me the best fuel economy. They claim better fuel economy and that's the only reason I want new injectors! Ejschultz how did your friend Todd4198's experiment go?

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post #560 of 675 Old 12-03-2013, 04:01 AM
SpectralZJ98
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Originally Posted by Football47 View Post
Think I found some decent injectors... what do you guys think? http://www.ebay.com/itm/96-97-98-Jee...9ef509&vxp=mtr I think they are flow matched Bosch 778s, I want injectors that will give me the best fuel economy. They claim better fuel economy and that's the only reason I want new injectors! Ejschultz how did your friend Todd4198's experiment go?
They look good, and I love that the wiring adapters are included. Allows for use of both style injectors. May have to get a set just to test them out.
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post #561 of 675 Old 12-03-2013, 04:34 AM
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Quote:
Originally Posted by Football47 View Post
Think I found some decent injectors... what do you guys think? http://www.ebay.com/itm/96-97-98-Jee...9ef509&vxp=mtr I think they are flow matched Bosch 778s, I want injectors that will give me the best fuel economy. They claim better fuel economy and that's the only reason I want new injectors! Ejschultz how did your friend Todd4198's experiment go?
His experiment went the way he hoped. His stock Siemens 778s rebuilt perform better than his Bosh 703s rebuilt, in his case. Earlier in this thread you read about people having issues with their Jeeps not learning the 703s and running really rich. His was one of those Jeeps for whatever reason.

97 ZJ - 5.2L, 242, 4" IRO lift w/short arms & adj. TBs, JKS Discos/BPEs, DT3000s, Aussie'd 44A, sliders, bumpers, bunch o' skids, 31" Duratracs on 15x8s
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post #562 of 675 Old 12-03-2013, 09:45 AM
SpectralZJ98
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Contacted the seller on eBay about those injectors:
"these are xf2e injectors. 235cc and the harnesses come with them."
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post #563 of 675 Old 12-03-2013, 03:11 PM
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Originally Posted by SpectralZJ98 View Post
Contacted the seller on eBay about those injectors:
"these are xf2e injectors. 235cc and the harnesses come with them."
The flow rate is 22 lbs/hr, 230 cc/min at 43.5 psi... that sounds about right...right? Stock 4.0 Injector (96-98): Siemens 53030778 are 23.7lb/hr @ 49psi and the 703's are 24.0lb/hr @ 49psi...

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post #564 of 675 Old 12-04-2013, 03:47 AM
Football47
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Those injectors with the adapters are actually Siemens fuel injectors... even though it said Bosch right in the description model XF2E 22lbs/hr @ 43.5psi. So lower Psi and lbs/hr means what? Weaker throttle response? Better gas mileage???

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post #565 of 675 Old 12-04-2013, 05:10 AM
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Quote:
Originally Posted by Football47 View Post
Those injectors with the adapters are actually Siemens fuel injectors... even though it said Bosch right in the description model XF2E 22lbs/hr @ 43.5psi. So lower Psi and lbs/hr means what? Weaker throttle response? Better gas mileage???
He'll if I know. Your pump should be operating at 49psi anyway.
http://m.ebay.com/itm/251338643115?nav=WATCHING&sbk=1
Like these better
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post #566 of 675 Old 12-05-2013, 03:02 PM
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Well just purchased those injectors online off eBay... will be posting my overall gas mileage and distance traveled before I put the new injectors in and test them out!

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post #567 of 675 Old 12-05-2013, 04:23 PM
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Well just purchased those injectors online off eBay... will be posting my overall gas mileage and distance traveled before I put the new injectors in and test them out!
The ones with the wiring harnesses, or the direct fit yellow ones?
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post #568 of 675 Old 12-09-2013, 11:51 AM
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Quote:
Originally Posted by Football47 View Post
Those injectors with the adapters are actually Siemens fuel injectors... even though it said Bosch right in the description model XF2E 22lbs/hr @ 43.5psi. So lower Psi and lbs/hr means what? Weaker throttle response? Better gas mileage???
That's 22 lbs/hr at 43.5 psi. That's just what they are rated at. 43.5 is a common pressure rating for injectors so they can be easily compared. If your Jeep's fuel pressure is 49 psi the actual flow in your application will be about 23.3 lbs/hr. http://www.csgnetwork.com/fiflowcalc.html If the stock injectors are 23.7 lbs/hr at 49 psi then you will probably run a little leaner in open loop and the computer will recalibrate in closed loop for no net change in A/F ratio.
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post #569 of 675 Old 12-10-2013, 01:24 AM
Football47
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Originally Posted by SpectralZJ98 View Post
The ones with the wiring harnesses, or the direct fit yellow ones?
Adapter harness. Well got my injectors today and put them in, took it for a test drive and woah did I feel a difference. I had a noticeable gain in throttle response, seemed to idle a little bit smoother, but I'm not sure about my mpg. I had 5190 miles clocked in at 18.3mpg, it has been dropping ever since it's been getting colder out. I usually get about 17.5mpg in the winter time/ 19-20 in the summer time and with 38 miles on my new injectors I'm getting 17.3mpg... shouldn't the computer have corrected this by now. I should probably wait and get some more miles accumulated. Thoughts?

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post #570 of 675 Old 12-10-2013, 10:26 AM
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Originally Posted by Football47 View Post
Adapter harness. Well got my injectors today and put them in, took it for a test drive and woah did I feel a difference. I had a noticeable gain in throttle response, seemed to idle a little bit smoother, but I'm not sure about my mpg. I had 5190 miles clocked in at 18.3mpg, it has been dropping ever since it's been getting colder out. I usually get about 17.5mpg in the winter time/ 19-20 in the summer time and with 38 miles on my new injectors I'm getting 17.3mpg... shouldn't the computer have corrected this by now. I should probably wait and get some more miles accumulated. Thoughts?
Going by the trip computer is a very inaccurate way to determine MPG. It's never correct.
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