Landseer

I haven't found a direct, new replcement aftermarket injector for the USA LJet cars. But with some digging you may find a bosch set that would match.

They have barbed tops, different than the bosch design II or III injectors that can be directly swapped onto the 32 V cars.

One thing you can do is ship them out for refresh. Witch Hunter on west coast cleans and tests them for 20 dollars each or so, incl shipping. They turned around a set for me in less than 10 days incl transit.

Search here for more info - lots written, including reviews on the above mentioned rail replacements and alternatives. Impedance issue also has been discussed an my takeaway was the ljet circuit board could drive the later injectors. Do confirm.

Whatever you decide, let's hope youkve alredy changed you rubber fuel lines on thhat 81 car. Very dangerous when aged.

stvracing

Thank you all. Would someone mind giving me the part #? I just prefer to put in a new set. Im doing what I can to make this car as reliable as possible. I intend to drive this car EVERYDAY not let it just sit and be looked at. Im also changing to a set of Euro heads for I plan on doing a top end rebuild with a new TB, WP and OP. So while in there I might as well to everything that could pose a problem down the road.

Ethre

Porsche Parts Catalog Available Here

Porsche number is
928-606-110-01

I think the Bosch number is
0-280-150-154

The Bosch ones are $1xx+ each (depending on purchase location). I think Pelican has them for $120 or so.
Rock Auto has two non-Bosch alternatives at ~$80 each. I don't know if they work or how well. May be a great alternative though.

hacker-pschorr

Clean the ones you have.

New injectors are not flow tested and matched, which is part of the cleaning service.

You can buy Ford racing injectors which are flow matched and cost a lot more money.

There is also a good chance the "new" L-Jet injectors you buy have been sitting on a shelf collecting dust for 10+ years.

stvracing

Thanks for the response. Whats the turn around on the cleaning?

hacker-pschorr

I guess it will depend on how busy they are, I would call ahead. Usually pretty quick, couple day turn around.

I use these places:
http://www.witchhunter.com/
http://www.cruzinperformance.com/

Ethre

He's in an 80 so he can't use Ford injectors.

Also - they don't flow match injectors if you send a set in for cleaning. They can only clean and test.

I had good luck getting mine cleaned though. http://www.mrinjector.us/

MikeinBloomfield

Sorry, what's the difference between flow matching and flow testing? Witchhunter promises a report with flow numbers before and after. I'm planning on only replacing those injectors that fail the second test.

Is flow matching how they all work together? I would imagine that they can't reasonably do that. How important is this?

stvracing

Flow test is just going to tell you how much each injector flows. Flow matching Is just that the injectors are matched to one another.

stvracing

Ethre, that site is very informative thanks for the link. Thank you everyone else for your input. One other ?. I read that someone who was putting a set of Euro heads on I think an '85 or '86 engine but had to cut their pistons. Is this the case if I switch my heads or does this only apply to the newer engines?

Fabio421

I have a source for brand new low impedence Bosche barb style injectors in 29 lb/hr. These are a direct bolt in replacement with a slightly higher flow capability. Stock L-Jet injectors ar 24 lb/hr. These work great and are cheaper than the 24 lb/hr injectors. They come with new fuel hoses attached to each one.

stvracing

Fabio, Im interested but wont be doing this for about a month or so. If you still have them then let me know.

hacker-pschorr

Yes he can, just needs to change the rails or have the injectors modified for a hose fitting.

You can run high impedance injectors in a low impedance system, just not the other way around without a 3rd party driver.
There really isn't any reason to do so, unless you are bulding a high HP car and need larger injectors. Then again, the largest injectors tend to be low impedance anyway.......all moot points thanks to the limited tuning abilities with the L-Jet computer and barn door.

Besides, that was just an example. I never said he should buy "Ford" injectors.

I've sent in over a dozen sets of injectors and they always come back with a report showing they are all flowing within a very small percentage of each other.

I've sent in brand new injectors that were way off by comparison.

Call it what you want, point is "new" is not always "better".

Ethre

Good point - changing the rails would give him some other options.

Cruzin gives a good description of how flow matching works:
If they were originally closely matched than I would assume they should clean up close to each other in flow rates (barring any damage). If they weren't closely matched to begin with, then no cleaning will make them match.

stvracing

Well since I posted this Ive aquired 2 other engines.( you can never have too many engines) So Im going to send ALL 24 injectors out and put the best 8 together and use them in my engine. Also I will be changing the fuel rails. I appreciate all the advice. Thank you all, Happy Easter!