tuning with a wideband for running with a nb.

kanenas · Post by **kanenas** » Fri Feb 24, 2006 11:58 am

I know nothing about the different wb setups in the market, however the zeitronix is sold with a stated accuracy of +/- 0.1 units in AFR. But that might be just "marketeering", aimed at pulling in customers. I wish that Eric could make a comment on this accuracy/calibration thing, with all his work on his own wb controller he should have plenty of data on existing units.

whittlebeast · Post by **whittlebeast** » Fri Feb 24, 2006 1:01 pm

The issue is not the acceracy of the wideband. Its the issue of getting the wideband to output a known voltage as it relates to a known AFR and then getting the squirt to correctly convert the signal back to the correct reading.

This is enough to drive a noobee to parking the toys and watching football on the couch.

AW

kanenas · Post by **kanenas** » Sun Feb 26, 2006 11:29 am

I reread this thread. The real conclusion seems to be that a nb sensor is just fine for all applications, however it should be easier to be safe with a wb in a turbo application. As one gains some experience in tuning, it is not necessarily better to use a wb. Actually my feeling is that wb is not ready for prime time yet. Perhaps when the performance of the various wb setups becomes universally consistent things will change.
Again, thanks for the feedback everyone.
d.

T3Bunny · Post by **T3Bunny** » Sun Feb 26, 2006 3:10 pm

kanenas wrote:....Actually my feeling is that wb is not ready for prime time yet. Perhaps when the performance of the various wb setups becomes universally consistent things will change.

NEVER going to happen and have an accurate setup. The widebands are not the problem here. Its the installation and setup thats the issue. The reason these are such a pain to setup is they are SUPER SENSITIVE. They will be offset by the slightest amount of resistance in the grounding setup. The differances we are talking about here like seeing 14.68 in Megatune and then 14.72 on the seperate wideband gauge.

Now there is a way that would make it a lot easier I guess. A fully built in controler to the MS unit that is using the same grounds and referance points. The ready ability of inexpensive widebands hitting the market like the $200 LC-1, setup has definatly put the need for an integrated controler on the back burner...

FoundSoul · Post by **FoundSoul** » Tue Feb 28, 2006 7:10 am

Like Andy and Richard have said, it's all in taking the time to understand exactly what you're doing, why things need to be wired up a certain way etc... and I agree that gathering that information together can be a bit tricky as it's spread a bit here, and a bit there...

Honestly the Innovate products 'Quick Start Guides' are excellent about guiding you through their part of this, I just installed an LC-1/XD-1 combo in my MR-2 and I used their Quick Start guide to see how well it works out and it has you ground everything exactly as you should, there's really only one thing to add for use with a MegaSquirt and that's a 330-470ohm resistor inline with the analog output (LC-1 only, not needed with the LM-1). I'll include this and add to it to include the MS software config side of things, configuring MegaTune and such. At this point my readings in MegaTune and on my XD-1 are perfectly in sync and my confidence in my wideband is 100%.

I'll put it on my to-do list... tech article coming soon. How to do wideband and do it right. From a MegaSquirt perspective but universally applicable...

T3Bunny · Post by **T3Bunny** » Tue Feb 28, 2006 8:25 am

Jerry, that DEFINATLY sounds like an interesting writeup! I am looking forward to reading that one!

FoundSoul · Post by **FoundSoul** » Tue Feb 28, 2006 8:28 am

fscott · Post by **fscott** » Tue Feb 28, 2006 8:31 am

FoundSoul wrote:I used their Quick Start guide to see how well it works out and it has you ground everything exactly as you should, there's really only one thing to add for use with a MegaSquirt and that's a 330-470ohm resistor inline with the analog output (LC-1 only, not needed with the LM-1).

Why is this resistor needed? Does it go onto the wire leading from the LC-1 to the MegaSquirt's oxygen sensor input?

Fred

T3Bunny · Post by **T3Bunny** » Tue Feb 28, 2006 8:31 am

FoundSoul wrote:???

I had a posting issue...

I have noticed recently if you PM somebody without a subject title, it tosses it out onto the thread itself. ANNOYING!

FoundSoul · Post by **FoundSoul** » Tue Feb 28, 2006 8:35 am

That's correct, in between the analog output from the LC-1 and the o2 input to the MS. The MS tends to pull a little more current on the O2 input than most EMS's do and can overheat the DAC and burn it up. The LM-1 can handle the current draw but the LC-1 is safer with this resistor in place. I'm sending a MSI PCBv3 unit to Innovate so they can do some testing...

It doesn't seem to affect the readings at all. As I mentioned mine are rock solid between my XD-1 and MegaTune display and the CD-1 is using the digital connection without the DAC and therefore the resistor being in play...