R35 Injector latency

[madaxgt]

As title does anybody have injector latency values? Im on feature pack 2 so a table is easier but I can convert from non-FP system if anybody has tested/calibrated them.

Does haltech etc have any values in some basemap I could rob them from?

[Eric]

in the r35 ECU it's set to 1.78ms @14V

[polemite]

thanks for this info guys.

are all the r35 injectors 570cc? i see a few different numbers thrown around the internet, from 550, 560, and 570.

mine are from a 2015.
i used the 1780us number from below, and my idle was super rich. dropped to 1100, and afr is now close, but slightly rich. seems like if i go any lower though, the idle starts getting rough.

[Matt]

With 1780uS that seems awfully high. The most I've used is 1250uS and that is with 1000CC

For around the 570CC I would start with 800uS. Once you have your base mixtures at cruise setup, then you can fine tune this after

Variation with CC may be misinformation or different flow test results?

[polemite]

yeah, probably misinformation on the cc. PL was quite certain on the flow rate.

this latency value is kinda crazy though. i was getting afr in the 9's at first.

still sitting at 1100us for now. seems to be working well. i just need to finish dialing in tim and tp before i go back to latency now.

[louiswun]

I've done few CA18DET with GTR35 injectors, it should be 800us to 850us .
It is the same injector of SARD parts #63570
https://www.sard.co.jp/after_eng/produc ... anyou.html

[polemite]

awesome.

yeah, i've already been getting much better results in the 800-850 range after matt's recommendation, but it's great to have you validate this.

funny how sard lists it as a 550cc also. kinda adds to the confusion over the flow ratings.

but using 570cc in the injector resize and 800us for latency, got me into the ballpark pretty quickly.

[RomChip200]

I had ~740cc from DW (370cc purple redrilled) and fitted yellow 750cc few days ago.
1120us (0x70) is the value for me (E85), anything lower and it makes the idle rough (AFR 20) and would jeopardize the fuel map (especially the values when cruising and the transition from low TP to mid TP)

Take the injector latency as the last parameter to tune to idle where you want (in term of AFR) with closed-loop disabled of course.

[STATUS]

in the r35 ECU it's set to 1.78ms @14V

Remember these are uncorrected values there are a plethora of other tables which are multiplying off this table to get the final
values.

do not use those values at face value.

[RomChip200]

The problem with latency is it's an incompressible value added to the inj pulse width.
If too high, it may jeopardize AFR (too rich) when cruising at very low TP (barely touching the throttle)