0-5v 02 mod...

dr_drache · Post by **dr_drache** » Tue Aug 28, 2007 7:18 pm

Was wondering how i would go about modding my ecu to use a 0-5v o2 (from wideband... duh) told there is some simple mod? also... my wideband has 2 outputs... should i use Not buffered: Can not sink or source any current or a Buffered: Can sink or source up to 25[mA] voltage output? thanks.

zeeman · Post by **zeeman** » Wed Aug 29, 2007 9:51 am

on an obd1 ecu all you have to do is remove J12

xenocron · Post by **xenocron** » Wed Aug 29, 2007 10:44 pm

zeeman wrote:on an obd1 ecu all you have to do is remove J12

thats for datalogging... 0-5v mod is in the Wiki

dr_drache · Post by **dr_drache** » Thu Aug 30, 2007 9:09 am

what wiki? now that i am asking... is the 0-5v mod even worth it? or should i just rescale my output to say... 0-3.5v? also, ideas about the output lines?

xenocron · Post by **xenocron** » Thu Aug 30, 2007 10:07 am

dr_drache wrote:what wiki? now that i am asking... is the 0-5v mod even worth it? or should i just rescale my output to say... 0-3.5v? also, ideas about the output lines?

not worth it IMHO

dr_drache · Post by **dr_drache** » Thu Aug 30, 2007 10:24 am

well, your HO means a bunch

unless I get other opinions, then i'll just rescale the output....

relic1 · Post by **relic1** » Thu Aug 30, 2007 11:25 am

xenocron wrote:not worth it IMHO

agreed... what you have to consider is what A/F is actually represented by 3.8-5V... most of the time it's values that you hopefully never see anyway.

Bindegal · Post by **Bindegal** » Thu Aug 30, 2007 12:41 pm

Definitely not worth the troble. Especially as you can just connect it to ELD/D10 instead which (if memory serves me) is unrestricted. /Allan

dr_drache · Post by **dr_drache** » Thu Aug 30, 2007 1:26 pm

well, should i have a 0-3.8v input or a 0-5v input? or both?

Bindegal · Post by **Bindegal** » Thu Aug 30, 2007 2:14 pm

Well, thanks to eCtune you have both options available to you already. I usually keep the stock O2 in place (on D14) and connect the wideband to D10. That way I can datalog and also verify closed loop is working properly. /Bindegal

dr_drache · Post by **dr_drache** » Thu Aug 30, 2007 2:25 pm

well, in my case, the wb will be working dual duty.. n/b to reg sensor, (d14) and wb to d10..... soo... i just need to get ectune... whenever the pro beta or whatever finally comes out.

dr_drache · Post by **dr_drache** » Sat Sep 08, 2007 5:25 pm

I am wondering if i need to rescale the o2 output... i currently have it set for (closed loop) : 34.28 2.33 3.43 33.26 2.26 3.33 32.28 2.2 3.23 31.33 2.13 3.13 30.43 2.07 3.04 29.56 2.01 2.96 28.73 1.95 2.87 27.93 1.9 2.79 27.17 1.85 2.72 26.43 1.8 2.64 25.73 1.75 2.57 25.06 1.7 2.51 24.41 1.66 2.44 23.8 1.62 2.38 23.21 1.58 2.32 22.64 1.54 2.26 22.1 1.5 2.21 21.59 1.47 2.16 21.1 14.4 2.11 20.62 1.4 2.06 20.17 1.37 2.02 19.74 1.34 1.97 19.32 1.31 1.93 18.93 1.29 1.89 18.55 1.26 1.85 18.18 1.24 1.82 17.83 1.21 1.78 17.49 1.19 1.75 17.16 1.17 1.72 16.84 1.15 1.68 16.53 11.2 1.65 16.23 1.1 1.62 15.94 1.08 1.59 15.65 1.06 1.57 15.37 1.05 1.54 15.1 1.03 1.51 14.7 1 1.47 14.68 1 1.47 14.53 0.99 1.45 14.38 0.98 1.44 14.24 0.97 1.42 14.1 0.96 1.41 13.97 0.95 1.4 13.84 0.94 1.38 13.71 0.93 1.37 13.59 0.92 1.36 13.47 0.92 1.35 13.35 0.91 1.33 13.23 0.9 1.32 13.12 0.89 1.31 13.01 0.89 1.3 12.91 0.88 1.29 12.8 0.87 1.28 12.7 0.86 1.27 12.6 0.86 1.26 12.51 0.85 1.25 12.41 0.84 1.24 12.32 0.84 1.23 12.23 0.83 1.22 12.14 0.83 1.21 12.05 0.82 1.21 11.96 0.81 1.2 11.88 0.81 1.19 11.8 0.8 1.18 11.72 0.8 1.17 11.64 0.79 1.16 11.56 0.79 1.16 11.48 0.78 1.15 11.4 0.78 1.14 11.32 0.77 1.13 11.25 0.77 1.12 11.17 0.76 1.12 11.1 0.75 1.11 11.02 0.75 1.1 10.95 0.74 1.09 10.87 0.74 1.09 10.8 0.73 1.08 10.72 0.73 1.07 10.64 0.72 1.06 10.57 0.72 1.06 10.49 0.71 1.05 10.42 0.71 1.04 10.34 0.7 1.03 10.26 0.7 1.03 10.18 0.69 1.02 obviously, with crome.

Post by **nate** » Sat Sep 08, 2007 7:38 pm

There are 12 rows in the Wideband Voltage Conversion Table, so yes you would need to scale it down a bit.

Coupe-r · Post by **Coupe-r** » Thu Oct 18, 2007 9:27 pm

agreed... what you have to consider is what A/F is actually represented by 3.8-5V... most of the time it's values that you hopefully never see anyway.

Totally agree my innovate LC-1 reads from 0v=7.35 to 5v=22.39 Therefore 22.39-7.35=15.04AFR range Divide this range by 5 volts=3 AFR for every 1 volt change. ECU maxes out at 3.83 on D14 THEREFORE 3AFRx3.83v=11.49AFR + the initial 7.35AFR the innovate starts at =18.8AFR is the max the ECU will read with a scale of 0v=7.45 and 5v=22.39 (You can confirm this when you back off the throttle, logworks will show 02 content and your ECU will show 18.8 ) Use this formula to work out what you ECU will max out and where you need to scale. (or not scale at all) I leave mine at factory settings, why would you need to read below 7.35 or above 18.8 anyways? People do say that the D14 gets inaccurate at the extremities of its voltage ranges HOWEVER the range we want to see, say 11-16 should be very accurate. I have tested this against logworks and everything matches up perfectly! I did not know we could use D10 ELD (Would have to work out how to configure freelog for this output) on a side note why bother cause it works great as it is on D14. P.S If you are having accuracy problems try rescale so your AFR doesn't increase so much compared with voltage. E.g. 2AFR for every 1v change could be better. You ECU will max out at a lower AFR tho, unless you use D10