L-Jet injectors
#1
Instructor
Thread Starter
L-Jet injectors
Been thinking it would be nice to change the 30yr old injectors ('83 928S) for new set of Ford type.
Problem is the expense and bother of new fuel rails and hold downs.
Since there is so much distance between the stock fuel rail and injector (2" hose connector between), seems as though a simple 1" adapter-barbed at one end for a short hose connection with the rail, and a cup at the other to accept the new injector with the O ring would work.
Probably $5-$6 cost each to have machined if a small quantity were ordered.
Before I look into this further, would appreciate any comments from those who know more about this setup than I do.
Also, has anyone converted the L-Jet to Ford type injectors, and if so, any problems?
Problem is the expense and bother of new fuel rails and hold downs.
Since there is so much distance between the stock fuel rail and injector (2" hose connector between), seems as though a simple 1" adapter-barbed at one end for a short hose connection with the rail, and a cup at the other to accept the new injector with the O ring would work.
Probably $5-$6 cost each to have machined if a small quantity were ordered.
Before I look into this further, would appreciate any comments from those who know more about this setup than I do.
Also, has anyone converted the L-Jet to Ford type injectors, and if so, any problems?
#3
If the car runs well why bother ? the rest of the car is 30 years old as well. No point looking for things to change which do not need it and will not improve how it runs. Plenty of things WILL need replacing as they fail. And the question should be "any benefits ?"
#4
Race Director
http://www.fiveomotorsport.com/impor...uel-injectors/
Or 928motorsports
http://www.928motorsports.com/parts/ljet_injectors.php
They all are pricey..... Typically the high wear item is the little bit of hose from the injector to the rail....I just bought a bunch of fuel hose and C clamps and replaced them all myself....
Or 928motorsports
http://www.928motorsports.com/parts/ljet_injectors.php
They all are pricey..... Typically the high wear item is the little bit of hose from the injector to the rail....I just bought a bunch of fuel hose and C clamps and replaced them all myself....
#5
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http://www.fiveomotorsport.com/impor...uel-injectors/
Or 928motorsports
http://www.928motorsports.com/parts/ljet_injectors.php
They all are pricey..... Typically the high wear item is the little bit of hose from the injector to the rail....I just bought a bunch of fuel hose and C clamps and replaced them all myself....
Or 928motorsports
http://www.928motorsports.com/parts/ljet_injectors.php
They all are pricey..... Typically the high wear item is the little bit of hose from the injector to the rail....I just bought a bunch of fuel hose and C clamps and replaced them all myself....
#6
Man of many SIGs
Rennlist Member
Rennlist Member
I can get you 8 brand new L-Jet injectors for less than $300. If you decide to go with new style injectors be sure that you buy low impedance injectors.
#7
Rennlist Member
As an alternative to buying new, about 100 bucks to send them to Witchhunter. They flow them and send you a report; you will know if there's a bad injector. Good time to replace the injector hose too.
Last edited by NoVector; 09-09-2018 at 12:49 AM.
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#8
Nordschleife Master
Injectors have improved in the last 30 years, rail type systems are MUCH safer, injectors deteriorate over time, and biggest reason to change them is that the 928 fires all the injectors together. This means all the ones that flow a bit above average run there cylinders rich, and all that flow below average run lean, so lots of benefits in tuning using a flow matched set.
The newer rails can be modified to work on early cars.
Various vendors sell rail stock and a special drill bit that makes the injector fitting in a single pass. Fabrication of the rail mounts seems about the only issue.
#9
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Speaking of injectors, I have a set from a '84 that have been rebuilt and tested from someone that decided to go with the 928 Motorsport's custom setup with Ford injectors instead. He put the 84 928 motor in his Pantera with twin turbos, too cool.
Anyway, In the past the one or two that failed I'd just rebuild it so I never spent the time to learn about the details between the different year models and their injectors.
My question is, are the injectors the same for the 4.5 and the 4.7?
Anyway, In the past the one or two that failed I'd just rebuild it so I never spent the time to learn about the details between the different year models and their injectors.
My question is, are the injectors the same for the 4.5 and the 4.7?
#10
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They're up to $21/ injector (so $170/set), but the idea still holds. I'm about to send off two sets myself.
#12
Instructor
Thread Starter
I've cleaned them myself and replaced hoses about every eight years and always noticed improved gas mileage each time (performance probably too small to notice). Time to do it again hence my questions.
Watching videos of old vs new style injectors (pencil spray vs fine mist) makes it easy to believe that better combustion and mileage, and lower emissions would be achieved.
Placebo effect would make you believe you got better performance also.
There are many good sources and pictures for injector flow rates and sizes. So it may be possible to find a 24lb injector with the proper size injector end to fit stock intake without drilling.
Yes I am thinking of a simple adapter about 1" long with barbs on one end and cup with cutout for hold clip like new style injectors use.
If anyone is thinking of cleaning attached is a parts list for some injectors from Injector Rehab (most rebuild parts available for pennies ex. lower seal $0.36 filter $0.56)
Watching videos of old vs new style injectors (pencil spray vs fine mist) makes it easy to believe that better combustion and mileage, and lower emissions would be achieved.
Placebo effect would make you believe you got better performance also.
There are many good sources and pictures for injector flow rates and sizes. So it may be possible to find a 24lb injector with the proper size injector end to fit stock intake without drilling.
Yes I am thinking of a simple adapter about 1" long with barbs on one end and cup with cutout for hold clip like new style injectors use.
If anyone is thinking of cleaning attached is a parts list for some injectors from Injector Rehab (most rebuild parts available for pennies ex. lower seal $0.36 filter $0.56)
#14
Man of many SIGs
Rennlist Member
Rennlist Member
#15
Burning Brakes
Resuscitating an old thread here. I still have original injectors in my ‘83 but will do a fuel line and injector refresh. I saw another thread about using modern 4-hole injectors in the 32v models. Is there a similar modern injector upgrade for the L-jet cars nowadays? Want a dropin replacement. Otherwise what’s the consensus on the best oem-style replacement injectors?
Cheers,
Rick
PS here’s the 32v thread https://rennlist.com/forums/928-foru...e-ii-info.html
Cheers,
Rick
PS here’s the 32v thread https://rennlist.com/forums/928-foru...e-ii-info.html