Author Topic: Replacement Injectors  (Read 2436 times)

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Offline sharpxmen

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Re: Replacement Injectors
« Reply #15 on: December 02, 2009, 07:40:37 PM »
i also found some ford 24# bosch racing injectors design III for 64 bucks.  But the factory tj is 23# so is that that much better?
39lb/hr is way too much, your PCM won't be able to compensate so that is out of the question.

remember that you have to also consider the pressure at which they are rated - the TJ runs at 49psi and the 23.2lb/hr is the stock flow at that pressure, you put an injector that flows 24lb/hr at 43.5psi and you will get 25.47lb/hr static flow which is 9.5% more. But what are you trying to achieve though, do you need that much fuel? what is your afr at wot? you increase the fuel by 10% and you decrease the afr by roughly the same amount, at around 10% you should be fine, you'll get some power increase but your mpg will go down. that example is for 43.5psi reference pressure, so keep that in mind, you need to know the pressure at which the injectors are rated at and calculate the flow at 49psi which is the pressure on the TJ.
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Offline Jeffy

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Re: Replacement Injectors
« Reply #16 on: December 02, 2009, 09:25:57 PM »
Stock is 23.2# so you want to stay above that so 24's would be a good start.  I think 39's will be a little too much.
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roksld13

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Re: Replacement Injectors
« Reply #17 on: December 03, 2009, 05:57:53 AM »
yeah that was what i was thinking too, thats why im asking so many Q's because i have no clue about the afm or anything sooooo.