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Discussion Starter #1
Hi, I need to start learning fuel issues now.. i've done a search but couldn't really get the exact answer...

-in what power level i should change my fuel pump and fuel injectors?

- what is the power level that the stock fuel pump and the stock fuel injectors can handle PERFECTLY (when i mean perfectly i mean there is not a single problem at all)

- and if i go and change to bigger fuel injectors, what do i need to do (coz i know i need to do something like a chip to control it right?) and what about fuel pump?

i'm asking all this is because i felt that my car is going lean at high rpm like after 5000rpm (and i'm going to dyno these few days to check the air/fuel just to make sure.. but i still wanna know the answers first... thanks a lot.

also one more question, what exactly i need to do if i found out that my car is going lean after 5000rpm? i'm running n/a not FI, i also have a diablo chip, would this problem because of the chip?

thanks a lot for your help!!
 

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Just curious, but what makes you think your going to lean out above 5k? as far as the fuel pump goes I've heard of the Focus fuel pump handling 200+ HP without any problems, although the pump itself isn't the greatest and is subject to keel over just because and not necessarily due to HP.

My car has a JRSC and it runs rich with stock pump, injectors, and ECM all the way up to FCO, but I think my FP is dying a slow death as we speak. If your going to replace your injectors with larger ones you'll need to re-cal the MAF.
 

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Discussion Starter #4
haha... yea i didn't know much about cars but my car didn't feel good after 5500rpm that's why i said i THINK it was lean..

but i went to dyno today and found out it was kind of rich .. which is now posted in the other thread with questions, thanks a lot.
 
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