Various comments

[Jonathan R. Lusky]

Wouter de Waal writes:
> 
> I've just rebuilt a VW Type IV engine, which will be going into my Puma
> soon. (A Puma is a glassfibre body sitting on a bug chassis, that was
> produced locally and in Brazil. Probably still is being produced in Brazil)
> 
> This engine uses D-Jetronic,and being a tinkerer as well as the abovementioned
> masochist, I would like to play with the system. For starters I'll look
> at the inputs to the EFI box, and the outputs, and get the map. Later
> I can start the specialised stuff, like using better sensors. Even
> after reading the archives, I can't figure out what the consensus is on
> hot-wire mass sensors versus manifold vacuum sensing. Vacuum seems to
> be cheaper and easier from a hardware point of view, but Bosch sez that
> it's less accurate. Help!

At WOT, the speed denisty systems are almost always much more accurate
than mass air based systems. Mass air is easier to calibrate, tho.
 
> Some uncivilised parts of the world still use leaded exclusively. Like
> here where I am. Is it impossible to measure the mixture when using
> leaded, or do you just need different sensors?
 
You can do it, for maybe a 100 miles or so before the EGO's are totally
shot.

> >You don't need an FI system to have a thermocouple in each exhaust
> >port...  they provide nice info on cylinder balance, and can quickly
> >point out problems.  UEGO's are also realllly nice, but they're kinda
> >expensive.
> 
> Where would one find a thermocouple to fit in the exhaust? And of how
> much use are they?
 
I'm not sure where mine came from.  I know Omega makes some.  The are
just normal K-type thermocouples encased in a thin 12" stainless steel
probe.  I'm not sure how much they cost.
 

-- 
Jonathan R. Lusky                        lusky at knuth.mtsu.edu
http://frank.mtsu.edu:8001/~lusky/          (615) 455-9915
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68 Camaro Convertible - 350 / TH350  \_/ 80 Toyota Celica - 20R / 5spd