Siemens Injector Peak/Hold Ratio

[Hiflow Tony]

Hey guys,

I have recently purchased an M84 to replace my existing ecu in my Mazda RX7. I am finding the software good to use and with the help pages and webinars I am comfortable that I have created a good base to work from.

I will run my injectors staged. The primaries will be 2 Siemens FI11445 750cc injectors. For the secondaries I would like to run 4 Siemens FI11405 870cc injectors on my remaining two outputs. The information I have on the injectors is as follows:
- 2.5 Ohm resistance
- Amperage Peak 4.0 amps / Hold 1.5 amps

Being low impedence can I do this or will the current draw be to high with two injectors per output? I know I have to double the injector current setting if I do this, which would give me 8 amps. This is the max allowed. Am I pushing it?

From what I have read the peak hold ratio for this type of injector should be 4, but the above spec suggest 2.66 ??

While I'm asking, does anyone have battery comp info for these injectors?

Thank you in advance,

Tony.

[Hiflow Tony]

C'mon guys,

47 views of my post and nobody has any ideas ??!!

Cheers,

Tony.

[AdamW]

Cant help you with the deadtimes but the M84 will drive two 2.5ohm injectors in parallel ok.

[Hiflow Tony]

Thanks AdamW.

After hours of trolling on the net I found the info I needed. I'll put it here so it can be of use to others.

Siemens Injector Battery Comp.pdf

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