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post #1 of 16 (permalink) Old 05-12-2012, 05:36 PM Thread Starter
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What injectors?

What size injectors should I use? It's a 89 sc underdriveniven supercharger pulley not sure what size exactly. I will show you a picture of the motor so you all can see it. I am planning on doing the GTP rotor upgrade, and I know that I will need to change the injectors I just need to know what size to get. Thanks in advance for your suggestions

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post #2 of 16 (permalink) Old 05-12-2012, 06:30 PM Thread Starter
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Ok the picture of the motor


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89 Thunderbird SC 3.8SC W/ Factory manual
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94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #3 of 16 (permalink) Old 05-12-2012, 07:46 PM
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You will need a tune if you change injector size. Stock are 30#
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post #4 of 16 (permalink) Old 05-12-2012, 08:04 PM Thread Starter
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I figured but I am trying to get an idea of what size injectors I should get

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #5 of 16 (permalink) Old 05-12-2012, 11:00 PM
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Well I changed my car's super charger from the early model to the late model, added a 10% od pully, raised top, MP intake, mp 85mm tb, 85mm mass air with purple tube, a 3.5 inch cai, and 42 pound injectors with no tune.


91 SC 5 Speed: 3" drop springs, 10% OD blower pulley, 3.5" cold air intake, C&L 85mm MAF, MP 85mm TB, KW double IC, Walbro 255 lph fuel pump, #42 injectors, Mach One hood, saleen mustang wing, Solid Rubber Motor & TransmissionMounts, Autodown Windows, Auto open moonroof, March underdrive pullies Plug and play key less entry module.
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post #6 of 16 (permalink) Old 05-12-2012, 11:03 PM
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O yea be for you do anything with injectors get a bigger fuel pump.

91 SC 5 Speed: 3" drop springs, 10% OD blower pulley, 3.5" cold air intake, C&L 85mm MAF, MP 85mm TB, KW double IC, Walbro 255 lph fuel pump, #42 injectors, Mach One hood, saleen mustang wing, Solid Rubber Motor & TransmissionMounts, Autodown Windows, Auto open moonroof, March underdrive pullies Plug and play key less entry module.
91 Car Domain: http://www.cardomain.com/ride/390762...super-coupe-2d
00 Explorer Sport: Wife's Daily Driver
00 Car Domain: http://www.cardomain.com/ride/392408...ort-utility-2d
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post #7 of 16 (permalink) Old 05-12-2012, 11:40 PM Thread Starter
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I don't plan on putting anything on til all of the parts were in. Except for the exhaust that I am doing as soon as I can. And just for reference what are the 94/95 sc injectors rated at, I should be getting a 95 sc parts car at some point in the future.

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending

Last edited by renello79; 05-12-2012 at 11:43 PM. Reason: More information
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post #8 of 16 (permalink) Old 05-12-2012, 11:58 PM
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94/95 SC use 36# injectors .. but yeah they require a different duty cycle, so without a tune, it may not run correctly.
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post #9 of 16 (permalink) Old 05-13-2012, 12:10 AM Thread Starter
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Gay! Could it cause damage if I was to try them? Obviously I'm not willing to ruin a recently rebuilt motor, so if this is the case I'm not going to try it but if the injectors can work with a tune then that might be the route I would take

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89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending

Last edited by renello79; 05-13-2012 at 12:23 AM.
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post #10 of 16 (permalink) Old 05-13-2012, 12:50 AM
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It wont be spraying the correct amount of fuel, on Riddick's car, the MAF has a recalibrated sampling tube for the injector size which seems to work in some cases, but the PCM still doesnt know. I wouldnt risk it personally, but there is a lot more information on the SCCOA forums on this topic.
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post #11 of 16 (permalink) Old 05-13-2012, 01:12 PM Thread Starter
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I was intending on upgrading the maf throttle body, exhaust and sc rotors all at once. However I know this would require larger injectors as well I just need to figure out which ones

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #12 of 16 (permalink) Old 05-13-2012, 05:33 PM
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When it comes to injectors, it is always better to have too much injector than not enough. Also, depending what you are ultimately going to be doing with the car will determine how big you will need, and then you might as well go right for the biggest injector you will be likely to need rather than having to buy injectors multiple times. As for your setup, the 36# injectors from the 94/95 sc should be enough for what you are doing, but if you have it in the budget to get bigger ones, then go for it. Just remember you will need a tune for anything other than the stock injector size. Doing it with a "calibrated" maf will get you going down the road, but the ECM uses the Maf input for more things than just the fuel, so by lying to the ECM with a "calibrated" maf, it will throw a bunch of other things off and the car will never run as well as stock or make all the power you could be making.

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post #13 of 16 (permalink) Old 05-13-2012, 07:34 PM Thread Starter
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Yeah I'm not going to crazy with this car it's going to be my street/strip car. So it still needs to be reasonable. I plan on doing a strip car that can be driven on the road.

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #14 of 16 (permalink) Old 05-13-2012, 08:23 PM
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I do agree with madmikey. My "calibrated' MAF keeped my car on the road untell I could get a Quater Horse. Once the car had a proper tune it did ran a lot stronger.

91 SC 5 Speed: 3" drop springs, 10% OD blower pulley, 3.5" cold air intake, C&L 85mm MAF, MP 85mm TB, KW double IC, Walbro 255 lph fuel pump, #42 injectors, Mach One hood, saleen mustang wing, Solid Rubber Motor & TransmissionMounts, Autodown Windows, Auto open moonroof, March underdrive pullies Plug and play key less entry module.
91 Car Domain: http://www.cardomain.com/ride/390762...super-coupe-2d
00 Explorer Sport: Wife's Daily Driver
00 Car Domain: http://www.cardomain.com/ride/392408...ort-utility-2d
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post #15 of 16 (permalink) Old 05-13-2012, 08:40 PM Thread Starter
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I am planning on getting a dyno tune once it's all done. I'm towing it in

Phrum Steve

89 Thunderbird SC 3.8SC W/ Factory manual
http://photobucket.com/SCno1

94 Thunderbird LX 3.8 N/A Automatic
http://s1200.photobucket.com/albums/...Bird%20No%203/
sold, sadly

95 Thunderbird SC deal pending
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post #16 of 16 (permalink) Old 06-14-2012, 07:22 AM
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Mikey is right-on. I agree that 36#'ers should be plenty for only the upgrades you mention. Stock fuel pump should be okay too. A calibration tube in an aftermarket maf housing to match your setup will get the car running reasonably well, but a tune will be able to get the maf curve where it needs to be for optimum performance.

I would plan on getting the Maf to match the injectors, then later, the tune.

If I remember right, an early model sc with 36# injectors and a 76mm c&l maf, would need an "orange" sample tube.
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