3.2 injectors

[Jonny Cash]

Anyone know the exact difference between 3.2 and 3.0 injectors? And how much power have you/or someone you know put down with stock.

I have a lean issue, and I was wondering if the aftermarket injectors are easy to tune with NA. I feel like with the ported runners, BBB's and the big TB/MAF that theres room for more fuel delivery, and I could manage my fuel a little more if I had some extra to work with.

If a FPR is necessary for bigger injectors and NA thats fine too. I just want to hear some other peoples experiences

The search didnt go to well for me

 

[jedhead]

I have Stage 1 Cams, Headers and every other bolt on my 3.0 and still can run rich at WOT. I think the stock injectors are enough for N/A 3.0 - 3.3.

Bob

 

[Mac]

What # rating are the 3.0 and 3.2's injectors?

 

[Sh03d]

Rumor is that 3.2's have better flow. True or not I don't know.

 

[92sho16]

I've read on the forum that the 3L injectors are just under 24lbs while the 3.2L injectors are 24.4 lbs

 

[ManySHOs]

From a private email exchange on the same topic with John Hrinsin (I'm not posting classified info so I hope he doesn't mind ) :

"The stock MTX injectors (23.7 lbs/hr @ 2.7 BAR or 39.2 PSI) can safely (85%
duty cycle) support about 270cHP or about 225 wHP. The ATX injectors (24.3
lbs/hr @2.7 BAR or 39.2 PSI) flow about 2.5% more fuel than the MTX units,
so they are worth maybe another 5-8 cHP. If you push a set of ATX injectors
a bit to 90% duty cycle, they can flow enough fuel to support 290cHP or
about 240 wHP."...

"If you boost the fuel pressure with one of Josh's adjustable FPR kits from
the stock 39 PSI to say 45 PSI, you can also boost the flow rate of the
injectors by about 7.5%. Not sure how the TwEECer software can command the
WOT fuel curve to keep the adaptive learn from causing the interpolated WOT
valves from becoming too lean. Sounds like a Josh question there."

Ian

 

[Sh03d]

Now that is helpful.

 

[SeanMc]

Stock injectors are fine for my 3.3, and I'm running rich. I think they are 24.5lb/hr.

 

[Jonny Cash]

From a private email exchange on the same topic with John Hrinsin (I'm not posting classified info so I hope he doesn't mind ) :

"The stock MTX injectors (23.7 lbs/hr @ 2.7 BAR or 39.2 PSI) can safely (85%
duty cycle) support about 270cHP or about 225 wHP. The ATX injectors (24.3
lbs/hr @2.7 BAR or 39.2 PSI) flow about 2.5% more fuel than the MTX units,
so they are worth maybe another 5-8 cHP. If you push a set of ATX injectors
a bit to 90% duty cycle, they can flow enough fuel to support 290cHP or
about 240 wHP."...

"If you boost the fuel pressure with one of Josh's adjustable FPR kits from
the stock 39 PSI to say 45 PSI, you can also boost the flow rate of the
injectors by about 7.5%. Not sure how the TwEECer software can command the
WOT fuel curve to keep the adaptive learn from causing the interpolated WOT
valves from becoming too lean. Sounds like a Josh question there."

Ian

That is helpful thanks.