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944 & 944S Forum 1982-1991

early fuel injectors

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Old Jan 10, 2026 | 07:01 PM
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Tiger03447
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Default early fuel injectors

Gents: Recently, I noticed while on Clark’s garage, I noticed that the resistance on the Bosch fuel injectors was 2.5 ohms. I went to the garage and measured my aftermarket (supposedly compatible) injectors. Mine measured 2.2 ohms. Would this cause a problem for the DME driver circuit? I could see a problem if it were higher, not lower. After a bit of digging, it appears that the happiest range is 2.4 to2.6 ohms for the Bosch injector. TIA for any more info or insights.😂
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Old Jan 17, 2026 | 12:28 PM
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While the range of 2.4 - 2.6 is optimum, I don't see a slight deviation of .2 ohms to be significant. As noted, when the number vary more, it becomes an issue.
For instance, when folks try to run 2.4 ohm injectors in a turbo motor, things do not end well - the turbo injectors are rated at 4.6 ohms. This difference becomes significant and can surely damage the DME injector drivers.
One can also install additional resistors, but that's not optimal. One reason I can only suggest OE Bosch injectors...
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