2.4L LE5 Performance Tech 16 valve 171 hp EcoTec with 163 lb-ft of torque

2.4 injectors.

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Old 08-30-2006 | 01:14 PM
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joeworkstoohard's Avatar
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From: Gainesville, FL
2.4 injectors.

has anyone had any experience using larger injectors on a 2.4?

from what i understand the stock ones have trouble keeping up at high RPM... so i was thinking a set of stock SS/SC injectors may just do the trick... any thoughts?
Old 08-30-2006 | 02:30 PM
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From: Abita Springs, Louisiana
Originally Posted by joeworkstoohard
has anyone had any experience using larger injectors on a 2.4?

from what i understand the stock ones have trouble keeping up at high RPM... so i was thinking a set of stock SS/SC injectors may just do the trick... any thoughts?
I've bought a stock s/c set, but I haven't put them in yet. I've got a few mods, but I'm waiting for a header and my XTC b-pipe to arrive before I get it dyno tuned for the new injectors.

Go to: http://www.rceng.com/technical.htm and do the math. I trust Russ; I've raced with his components back in the 70's. He definately knows his stuff.

Our 24lb injectors are at 80%dc for the 2.2l, at about 90%dc for the 2.4l stock.

So, yes, the 2.4l could definately use bigger injectors when modifications approach the 195-200hp level. The 34lb injectors should be good for 230-240 hp n/a (less for a F/I setup.) I don't know what Hahn is running, but I'd suspect 45lb or so.
Old 08-30-2006 | 02:48 PM
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Originally Posted by sushidog
So, yes, the 2.4l could definately use bigger injectors when modifications approach the 195-200hp level. The 34lb injectors should be good for 230-240 hp n/a (less for a F/I setup.) I don't know what Hahn is running, but I'd suspect 45lb or so.
Could this be so marginal that this is the reason we're seeing lean codes with cold air intakes? The increased air flow could be pushing the injector cycle just over the threshold.
Old 08-30-2006 | 03:02 PM
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From: Abita Springs, Louisiana
Originally Posted by LewiSS
Could this be so marginal that this is the reason we're seeing lean codes with cold air intakes? The increased air flow could be pushing the injector cycle just over the threshold.
I don't think so, unless of course you get a lean code during a top speed run.

The problem with the lean code is MAF placement / contamination - more air is getting into the engine than the MAF is sensing. A good tune, richening up the a/f ratio at low throttle applications will solve this problem easily.
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