MkI coolant temp guage with 2 prong ABA sensor

[jdbubb at verizon.net (Dan Bubb)]

Well, if you're getting comfortable with the Megalogviewer, VE analyzer, datalog routine then you don't need me to much anymore although I'll still take a look if you'd like to send me some files.

Something that I learned from looking at Brian Spinney's datalog. For some reason his AFR was oscillating very quickly over a fairly wide range. Perhaps as much as over a 1 AFR band. I suggested he turn off EGO correction. He did indicate to me that it smoothed out the AFR although I haven't seen a datalog.

Anyway, the reason I suggest to might want to look for this is that although Meglogviewer can take EGO correction into account, there is a lag factor, especially with quick oscillation, that will probably confuse it and lead to incorrect adjustments through the VE analyzer.

I'm sure at this point your VE map is getting pretty close, so turning off the EGO correction (set authority to 0%) won't effect your running much at all and may let VE analyzer do a better job, not to mention let you see what's going on better while viewing the datalog.

Oh, and I think I might have some little Advance map tweaks that you might want to try at the track once you're happy with your VE map. ;^)
You might want to send me your msq so I can tweak that if you like.
Dan

From: "C Boyko" <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
To: " Dan Bubb " <jdbubb@xxxxxxxxxxx>
Cc: <scirocco-l@xxxxxxxxxxxx>
Sent: Wednesday, June 20, 2007 7:45 AM
Subject: Re: MkI coolant temp guage with 2 prong ABA sensor


> On 7:20 am 06/20/07 "Dan Bubb" <jdbubb@xxxxxxxxxxx> wrote:
>> OK, it took a little digging, but I found it.
>> We used a 35 ohm resistor on Kirsten's car.
>> No guarantee that'll be right for you car, but maybe......
> 
> Well, it's worth a shot eh? I'll see what I can come up with, and thanks
> for digging. What ar the odds that VW changed the sensor output again
> between ABA and the 1.8T (whatever code that is)?
>>
>> So, you going to send me a datalog and msq file so I can play with
>> your AFR before you hit the track again?? Dan
> 
> Well, if you're offering...:) I may do one more tuning run, and send that,
> we'll see. Saturday will be track time, any tuning tips  are always
> welcome. I'll probably do the "log three runs, analyse, smooth" routine and
> record which time slip goes with it, then run the fastest or most
> consistent map. I love that option...if the change isn't good, just go
> back....I expect some time spent hanging over her royal miserableness'
> engine bay too (for those who don't know, I ALSO have a 16V, LOL), she's
> running WAY too slow, and there should be more there....gotta do a bit of
> preening on them too, the VW cruise at Niagara Falls is Saturday night/car
> show Sunday. Should be lotsa VW loving this weekend!!
> Cathy 
>>
>>  From: "C Boyko" <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
>> To: " Dan Bubb " <jdbubb@xxxxxxxxxxx>
>> Cc: <scirocco-l@xxxxxxxxxxxx>
>> Sent: Tuesday, June 19, 2007 6:08 PM
>> Subject: Re: MkI coolant temp guage with 2 prong ABA sensor
>>
>>
>> >  THAT is more like what I was thinking of, of course, being lazy, I
>> >  was hoping that someone had done this and knew which resistor. I
>> >  guess I'll just have to pull out that pack I have and see what
>> >  happens eh? BTW, so far, I'm enjoying that cam! Should have some
>> >  hard numbers to go with the "impression that its faster" on the
>> >  weekend. Cathy
>> >
>> >  On 8:25 am 06/19/07 "Dan Bubb" <jdbubb@xxxxxxxxxxx> wrote:
>> >>  The temp sensor are just variable resistors. So, there is no
>> >>  reason the ABA sensor won't work with your existing gauge. The
>> >>  issue here is probably that sensors just have different
>> >>  resistance curves. On Kirsten's 1.8T swap we simply added
>> >>  resistance in series with the sensor until the gauge read in the
>> >>  middle of the range when the engine was at normal operating temp.
>> >>
>> >>   From: "C Boyko" <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
>> >>  To: <scirocco-l@xxxxxxxxxxxx>
>> >>  Sent: Sunday, June 17, 2007 5:02 PM
>> >>  Subject: MkI coolant temp guage with 2 prong ABA sensor
>> >>
>> >>
>> >> >   Yeah, so at some point my laptop won't be riding shotgun 24/7,
>> >> >   so I'll lose
>> >> >   my coolant gauge on Megatune. This is in my '79, ABA head, with
>> >> >   MSnS. Anyway, the stock ABA coolant temp sensor is in the
>> >> >   coolant manifold, and just isn't working to send info to the
>> >> >   stock cluster guage properly. The stock sender was a one wire,
>> >> >   and hooking up the ABA sender with one wire to
>> >> >   the gauge and the other to ground just pegs the gauge. How do I
>> >> >   know what the expected output is from the stock sender, and
>> >> >   how do I adjust what's coming from this ABA one? I don't think
>> >> >   that the stock one could be easily adapted, as it probably
>> >> >   grounds in the manifold, and the ABA one is plastic, not
>> >> >   metal. I don't have an ABA Bentley to see how it's normally
>> >> >   wired up. Thanks! Cathy
>> >> >
> 
>