Supra Forums banner
1 - 4 of 4 Posts

· Registered
Joined
·
508 Posts
Discussion Starter · #1 ·
I 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? Are 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.
 

· Registered
Joined
·
508 Posts
Discussion Starter · #2 · (Edited)
I know what ohms are. And apparently there's almost of 1 ohm difference between the 440's and 550's. That's a pretty decent difference as far as impedence goes. How does impedence effect the flow rate? What do the 3 digit numbers before the ohm's represent? Do the results look correct of 440's and 550's?
 

· Madd Tyte JDM yo ®
Joined
·
7,532 Posts
first off, you dont do static flow tests at 37psi. just about every gasoline fuel injector is a rated flow @ static 43psi. an injector marketed as a 440cc/min unit is rated at 43psi. when you drop the pressure to 37psi, it no longer flows 440cc/min. those numbers mean precisely dick to you.

a 1ohm difference is no big deal. you have to worry about when it goes from a 3-4ohm injector to a 13-14ohm injector. as long as they are within 1 ohm of the typical "low impedance" injector, itll work.

ive never seen results recorded in that form before..
ive sent my injectors to RC Engineering, paid $23/injector to have a baseline flow and pattern test, sonically cleaned and balanced, then an new flow/pattern test. all tests are done at 43psi static and recorded in CC/min.
 

· Registered
Joined
·
98 Posts
I 'm not sure but the 3 digit numbers look like the rating that the TSRM on line give you.it's cc per 15sec. they also say no more than 9cc difference between injectors. Test A kind of looks like before cleaning, test B looks like after cleaning and balance . No.4 of the 550's is within tolerence but could be alittle weak 5cc off the max of #3. multipling by 4 gives you the cc per min at 100% duty cycle which is how injectors are normally rated. hope this is the right info this time.
 
1 - 4 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top