Cone_eater

What lbs are stock injectors and what aftermarket ones will fit?

924S:?
944:?
968:?
951:?

FRporscheman

I know 944, 924S and 951 injectors can physically be interchanged, I am not sure about S S2 or 968. I think they can but I've never tried it.

Read this... https://rennlist.com/forums/showthre...tock+injectors

V2Rocket

stockers are 24 lb/hr.

turbos are 36 lb/hr and are the same part as those off a ford supercoupe ( )

siemens and delphi make 55 lbers that will plug in as well but youd need to work on your computer for those guys.

Cone_eater

Will universial aftermarket injectors fit? Or are all injectors about the same?

Darwantae951

You need to know what resistance the injectors are. There are low and high impedance injectors. For example (and this is how I've had it explained to me when I was selecting my larger injectors) a 951 is weird and has a "mid" impedance injector (not really common when selecting aftermarket injectors), so when going larger, ballast resistors are usually required so that the injector driver circuitry isn't overloaded.

V2Rocket

yupp.

ive seen alot of the ford racing injectors which will plug into a 944 but they are all high-impedance. 951 injectors IIRC are like 5 ohms or less..

Cone_eater

So a ford injector that is 5 ohms or less should work?

V2Rocket

yea. the ones off the supercoupe will work just fine. they are the same part as 951 injectors, they are 36 lb/hr.

not sure if for those youd need the resistors. for bigger ones (ive been looking into siemens 55# for my SC project) you would definitely need some resistors to stop from frying your DME.

Cone_eater

I just got a set of 150830 Accel injectors. Here they are
Will they work?

V2Rocket

cant be sure without knowing the impedance of those injectors and whether they will actually fit into the intake manifold/plug into harness

Cone_eater

They are a ford injector...
application chart

V2Rocket

not all ford injectors will fit; there are many many many different designs that only a few are similar enough that they will work easily on the 944 without modifying the computer/manifold etc.

something else to consider is the horsepower vs size of the motors in that application chart. its mostly either chevy small blocks or ford modular variants. what you need to remember is that those engines have twice the injectors of our 944 which means if they wanted equivalent horsepower each injector would only need half the rate of a 944's injector.

a 220HP crown vic 4.6L will have lower-flowing injectors than a 220HP t-bird SC

white924s

if you want aftermarket injectors for your car, check out www.rceng.com ...they have injectors with the right impedance (low) and physical shape (bosch o-ring) for the 944 or 924S and you can get pretty much whatever injector size you want (in terms of lbs/hr). Just remember that if you change the injector flow rate, you will need to completely revamp the car's fuel map to adjust. It only really makes sense if you have made significant modifications to increase the airflow into the engine (or, in other words, if you're going to make more HP than the stock injectors can support...iirc RC has a pretty good spreadsheet tool for figuring out what that is).

white924s

another thing to consider in injector sizing is brake specific fuel consumption. If you can increase that (hp per lb of fuel) by increasing compression (for example, there are other ways as well, but that's the easiest) then you can get more hp out of the engine without changing injectors.

Darwantae951

Mike...dude...check your link!