Thread: Feul Injectors
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Old 02-08-2002, 03:04 PM
HankL HankL is offline
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Join Date: Jul 2000
Location: Durham, NC, USA
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"I read the following from the Q&A section of the April 2001 Mopar
Performance News:


Q(5) I'm working on a fuel-injected combination and my dyno program shows I could benefit from more injector delivery. What can you tell me about flow rates of the injectors in your catalog? Also, if you have the factory injector rates would be very helpful.


A(5) You should step up the injectors in something like only 25 percent increments. The production V-8 is 24 - the MPP package is 30! Remember that you must change the computer if you change the injectors; at the least, it must be reprogrammed with the new injector values. Injector rates are not as easy as one might think, but they go something like this:

Engine Years Flow rate in lb/hr
Neon ( All) 23.9
2.5 Magnum 91-95 17.4
2.5 Magnum 96-01 23.2
4.0 Jeep 91-95 21.4 (Equivalent to Lucas 5207013 )
4.0 Jeep 96-01 23.2 (Equivalent to Lucas 5208005 )
5.2 Magnum 92-95 18.2
5.2 Magnum 96-01 23.2
5.9 Magnum 93-95 24.5
5.9 Magnum 96-01 23.2 (Seimens/Chrysler P/N 53030778)

---end quote---

Note that about 1996,
when the engine PCM computers went to the OBD-II standard,
all the Dodge fuel injectors went to a 'common calibration' of 23.2 lb/hour.

If you have a modified 1996+ Magnum engine and you feel you need to 'bump up' the fuel injectors just a bit, the model year 1993-1995 5.9V8 fuel injectors are about 6% larger at 24.5 versus 23.2, and Neon injectors are 3% bigger.

The 19 lb/hr Ford Motorsports injectors work ok as a bump up to early (1992-1995) 5.2V8 Magnums which have 18.2 injectors, but are not really all that good for later model years that have 23.2 injectors.

The PCM computer software has two memories (AFF and AAF) that can adjust up the fuel flow (based on O2 sensor feedback) to compensate for the smaller 19 lb/hr FMS injectors over time - but they are not really an improvement - especially for wide open throttle acceleration.

The 24 lb/hr FMS injectors are about the same as the 1996+ factory dodge injectors, which are built for Dodge by Siemens.

HankL
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