anybody bench flow their injectors?

allenmehrer · October 11, 2005

woundering if anyone has matched their injectors by flow rate. sounds like it would make a little bit more power and could even increase mpg, maybe.

mcreyaufmiller · October 11, 2005

I guess it may help if there was that much of a difference. I cannot see that there would be a great difference though. If so the computer would make up for the difference.

AirForceAngler · October 12, 2005

With the injectors running $60 or more apiece, how many are you going to buy to come up with a matched set?

allenmehrer · October 12, 2005

i started looking into this more and found that westers already does this, right on. i guess now i'm just just wondering if anyone has purchased these and what kind of results they've seen from them.

MrQuadrasteer · October 13, 2005

Wester's does sell flow-matched, ultra-sonically reverse-flow cleaned injectors (whew !!). They will provide better power, better economy, a noticeably smoother idle, better throttle response, and in the overall grand scheme of things, provide longer engine life due to a more balanced running engine.

I know some of these will be so small as to be almost unnoticeable by anything but a machine, but the idle and power and economy you should be able to readily see.

And best of all, Wester's only charges $19.95/injector with a $20/inj core charge- $160 for a set of baddass injectors. He's told me they are all +/- 1%.

intruder217 · October 13, 2005

Does anyone know what the typical variation is from the factory?

Butch 02 Denali · October 13, 2005

Does anyone know what the typical variation is from the factory?

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When Lyndon flow tests them, he finds huge differences, 10% and more. He matches them in sets all the same witin 1%. He flow tested some new Accel aftermarket high flow injectors and found some were way off too.

Yes, the engine will compensate for a high or low flowing injector. But the computer only knows what the right bank or left bank 02 sensors are telling it about the air/fuel ratio. If one injector is running rich, the computer will lean out the other 3 cylinders on that bank so you'll have one cylinder still a little rich, and 3 a little lean.

MrQuadrasteer · October 13, 2005

I've heard factory injectors can be as much as 30% off, high to low, sometimes even more.

And it gets worse as the miles rack up and deposits start forming on the injectors...

allenmehrer · October 13, 2005

thanks quadrasteer, they sound great. do you have them installed on your truck?

MrQuadrasteer · October 13, 2005

Heck no

Always something else getting in the way...

willieboy · October 13, 2005

The computer cannot compensate for a single rich injector. It can only compensate for a single side of the engine, or bank of injectors. With up to a 30% variation (I think it is +/-15%), you can have a cylinder that is consistently 15% lean and a cylinder consistenetly 15% rich, and the computer would never know. By flow matching the injectors and keeping them clean, you presumably get all the things that Quadrasteer mentioned above. If you think about it, this could be a real big deal for anyone spraying NO2, or anyone boosting. Lean cylinders are your biggest nightmare in those situations. The $160 for clean injectors that are flow matched just seems like a good deal for boosting/spraying applications to me.

Myself, I have not bought the flow matched injectors, yet. But back in my Dodge days, it was a big deal for anyone planning any major mod. Even those with no mods found that flow matched injectors really smoothed out the notoriously rough idle of the Dodge engines (3.9, 318, 360).

Chad H · October 13, 2005

So, is it worth the money on a N/A engine? Also, how much work is involved in replacing the injectors on these motors? I would pay the dealership to do it, if it didn't cost a bundle!!

Butch 02 Denali · October 14, 2005

So, is it worth the money on a N/A engine? Also, how much work is involved in replacing the injectors on these motors? I would pay the dealership to do it, if it didn't cost a bundle!!

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It's worth it IF they are mismatched. About an hours work, pretty easy.

allenmehrer · October 14, 2005

only an hour at a shop!.... lemme do some math on this

1 hr + (10 min. x 6 beers) + NASCAR race = 6 hours in my driveway!

sounds like a sunday project. oh hey are there any 'special tools' needed to pull or put these things back in right?

thanks guys

Chad H · October 14, 2005

You might need a fuel rail disconnect tool. If you do, I have the part number for you and a place where you can get it. You can get one at the parts store, but it will not work. Its not long enough.