DSM Injectors ON my 86 GXL
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DSM Injectors ON my 86 GXL
I thought my secondary injectors were plugged but their not, should i leave the DSM injectors in or put the stock ones back in?
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well, if you were putting them on just for testing then thats ok, but now that you know it wasn't a problem with the injectors put the stock ones back in and start looking for other problems.
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The "460" rating of the stock injectors can be reverse-engineered by averaging out the acceptable upper and lower flow limits of 444 to 472 cc/min to get 458 cc/min. If you also average the acceptable range for the fuel rail pressure of 34.1 to 39.8 psi you get 36.95 psi. Therefore, the average flow of the stock injectors when installed on a stock RX-7 in good condition is 458cc/min @ 36.95 psi.
Most fuel injectors are rated at 3 bar (43.5psi). I am not familiar with the DSM injectors, but if they are rated in this manner, then 450cc/min @ 43.5psi converts to only 415cc/min @ 36.95 psi. Were you to convert all 4 injectors on the engine, you would see about a 10% loss in fuel delivery, which would result in the engine running about 1.5 AFR leaner than intended.
Most fuel injectors are rated at 3 bar (43.5psi). I am not familiar with the DSM injectors, but if they are rated in this manner, then 450cc/min @ 43.5psi converts to only 415cc/min @ 36.95 psi. Were you to convert all 4 injectors on the engine, you would see about a 10% loss in fuel delivery, which would result in the engine running about 1.5 AFR leaner than intended.
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I already put the stock injectors back in but i was just wondering what people would say haha. but when they were in my car it actually ran exactly the same as it did with the stock injectors.
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I think it was because it was only the secondaries. Also, most people do not know the sound and smell of running lean. Try running a full 10% fuel reduction (12.5 AFR > 13.9 AFR) on turbocharged 13B and you will soon be picking apex seals out of your turbine blades. If you honestly don't care about a 10% difference, then you have no use for a wideband AFR meter, and can simply stick with a cheaper narrowband unit.
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