Any Injector Flow/Testing Experts in here?

Trying to figure out my next step. So I just had a set of injectors flowed and they came back all 8 flowing 12% less than what they are advertised at. He said they did not leak and had a good stream. I understand that there is a variance and they are not all going to flow exactly the advertised flowrate but having all 8 the same amount low is kinda fishy.

So my question is do I get them reflowed by another company. (Who do you recommend) or since they don't leak and the flow strong do I install them and tune to them.

Knowing that the flow 12% less than what there suppose to, will they meet your needs without pushing the limits?

Subd. Do not know anything about flow testing but will come in handy at some point.

me32 said:

Knowing that the flow 12% less than what there suppose to, will they meet your needs without pushing the limits?

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Yes by a large margin.

GodStang said:

Yes by a large margin.

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I say if your not above 78% on the flow needed by the injectors then the 12% less should be within a good safety margin. And if they all flowed within each other should be fine.

GodStang said:

Trying to figure out my next step. So I just had a set of injectors flowed and they came back all 8 flowing 12% less than what they are advertised at. He said they did not leak and had a good stream. I understand that there is a variance and they are not all going to flow exactly the advertised flowrate but having all 8 the same amount low is kinda fishy.

So my question is do I get them reflowed by another company. (Who do you recommend) or since they don't leak and the flow strong do I install them and tune to them.

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Was the flow testing done by a reputable tester?

I am not an expert or a professional in this field. That being said, I would not be overly concerned with the flow results. A lot of factors can contribute to the final results. Since you say that there is a large margin between the actual flow rate and what you need, what matters more is the balance between the eight injectors. Are they within a few percent of each other? If not, I would look into buying a new set of flow matched injectors. They won't be perfect either, but close enough.

Which either way you go, you have a chart of the flow rates for each injector. If your particular engine/set-up is known for having lean or rich cylinders, I would install the injectors accordingly, in an effort to better balance the engine. This too will not be perfect, but should be better than just randomly installing them.

*Sigh*. Numbers are invalid....

Are you saying they're fakes/counterfeit?

I was wondering if they're advertised at a different base fuel pressure. Something like XXlb/hr @ the GM spec of 43psi, which would be lower at the typical Ford 39psi.

What base pressure did the injector supplier get their advertised numbers? Compare that to the base pressure in your flow tests. If they are the same then I'd send those back and demand a refund. What brand injectors?

What made you get them tested to begin with?

SecondhandSnake said:

Are you saying they're fakes/counterfeit?

I was wondering if they're advertised at a different base fuel pressure. Something like XXlb/hr @ the GM spec of 43psi, which would be lower at the typical Ford 39psi.

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It was 3bar to 3 bar. Come to find out the guy had no idea what he was doing and flowed them with the spacer on the bottom blocking the flow.

earico said:

What base pressure did the injector supplier get their advertised numbers? Compare that to the base pressure in your flow tests. If they are the same then I'd send those back and demand a refund. What brand injectors?

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Bosch injectors flowed 3bar to 3 bar. Come to find out when I went back to look the injectors over I realized he flowed them with the spacer hat on the bottom.

BlckBox04 said:

What made you get them tested to begin with?

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Was trying to get flow data to put into my MS3Pro so each individual injector was exact.

what injector size are they

BlckBox04 said:

what injector size are they

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Bosch 210lbs (2200cc)

GodStang said:

Bosch 210lbs (2200cc)

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Where did you source them from? I've been looking at a set.

And what constitutes the "spacer hat?"

SecondhandSnake said:

Where did you source them from? I've been looking at a set.

And what constitutes the "spacer hat?"

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I bought the EV6 from here: BOSCH 210LB EV6/14 INJECTOR SET FOR 8-CYL APPLICATION

The "spacer hat" is needed so that it is the correct height for the 03/04 cobra and other mod motors..

How he flowed them on the left. How they were supposed to be flowed on right:

GodStang said:

How he flowed them on the left. How they were supposed to be flowed on right:

View attachment 1627935

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Very interesting

Why would you not want to run the test just as the injectors will be installed in the car?

It would seem that the spacer has a negative effect on flow, which is good for you to know.

9397SVTs said:

Why would you not want to run the test just as the injectors will be installed in the car?

It would seem that the spacer has a negative effect on flow, which is good for you to know.

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The injectors don't leak and they don't stick open which was a something I wanted checked. I will just use the injector data that they come with from the factory and use my dual wide bands to land it where they need to be. In the end it maters more in the tune in the car then what they flow on some dudes machine.