Can someone explain these Injector flow test results to me?

[MarkIII4Me]

had both my stock 440's redone and flow tested, as well as a set of Nippon Denso 550's. For some reason each injector was tested at a different PSI and the results just seem too similar to me for them being 440's and 550's. Did they make my 440's into 550's? Vise versa? Or do these results actually make sense?

Here are the results:



OEM 440's (#23250-42010)

Fuel Pressure: 37psi

Test "A"

STD CYCLE

1. 102 2.9 Ohms
2. 101 3.0 Ohms
3. 102 3.0 Ohms
4. 102 3.0 Ohms
5. 99 3.0 Ohms
6. 103 3.0 Ohms


Test "B"

STD CYCLE

1. 111
2. 112
3. 112
4. 111
5. 112
6. 112



Nippon Denso 550's (195500-1370)

Fuel Pressure 35psi

Test "A"

STD CYCLE

1. 120 2.1 Ohms
2. 125 2.1 Ohms
3. 135 2.1 Ohms
4. 110 2.1 Ohms
5. 133 2.1 Ohms
6. 121 2.1 Ohms


Test "B"

STD CYCLE

1. 130
2. 131
3. 133
4. 128
5. 132
6. 131




What exactly do these results mean? Are they good? I don't want to drop those 550's in and try boosting 25psi with the Nippon Denso's performing like OEM 440's.

I have no way of contacting the shop that did the work on these. If these results seem too vague, sorry, but that 's all the info written on these reports.

Thanks for any help.

 

[bigal0043]

i dont have any knowledege about this but i would imagine that you want all the numbers from the 550s to be around the same? like under test a number 4 was only at 110 while the rest were in the 20's and higher...

to me that would show one of them isnt flowing as much as the others?

 

[Supracentral]

had both my stock 440's redone and flow tested, as well as a set of Nippon Denso 550's. For some reason each injector was tested at a different PSI and the results just seem too similar to me for them being 440's and 550's. Did they make my 440's into 550's? Vise versa? Or do these results actually make sense?

Some injectors have common failures that require testing to be done hot, with high side pressure specs and at a particular pulse rate. Your Toyota factory injectors are listed in the injector bible as requiring a 37 psi base rate. The Denso's are listed at 35. He's performed the test properly, however it does mess up your "apples to apples" comparison.

This one is the "before" test for the stock injectors. As you can see #5 was a little weak:

OEM 440's (#23250-42010)
Fuel Pressure: 37psi
Test "A"
STD CYCLE

1. 102 2.9 Ohms
2. 101 3.0 Ohms
3. 102 3.0 Ohms
4. 102 3.0 Ohms
5. 99 3.0 Ohms
6. 103 3.0 Ohms

This is the "after" test for the same injectors. He's gotten them to flow better and they are much more consistent:

Test "B"

STD CYCLE

1. 111
2. 112
3. 112
4. 111
5. 112
6. 112

This is the before test for the 550's. They are pretty much all over the place, with #3 & 5 being very strong and number 4 being pretty lame. This is why I always tell people to get injectors flow tested before installing them, even if they are brand new. This sort of variance isn't uncommon right out of the box:

Nippon Denso 550's (195500-1370)

Fuel Pressure 35psi

Test "A"

STD CYCLE

1. 120 2.1 Ohms
2. 125 2.1 Ohms
3. 135 2.1 Ohms
4. 110 2.1 Ohms
5. 133 2.1 Ohms
6. 121 2.1 Ohms

This is the after test for your 550's. He's gotten them to be quite a bit more flow matched than they were before, although #4 is a hair weak still, it's still within the acceptable range.:

Test "B"

STD CYCLE

1. 130
2. 131
3. 133
4. 128
5. 132
6. 131

What exactly do these results mean? Are they good? I don't want to drop those 550's in and try boosting 25psi with the Nippon Denso's performing like OEM 440's.

As I said, the different base pressures have skewed the results a tad. However remember your 550's are only 20% +/- larger than your 440's. And there's close to a 20% +/- increase, even with the 2psi variation in test pressure. Overall both sets of injectors look good and are suitable for use.

Pop the 550's in and have at it, you are good to go.

 

[MarkIII4Me]

Awesome. Thanks.

 

[bigal0043]

so i was sort of right with my post... i didnt know what the second test showed... good to note for the future