what to use in stead of lamda?

[speedy]

hey guy's,

i started my second project,but this a 93 gti.
so,it is different to the mark 1. i don't want to use the lamda....
is there a other way to go with that???

cheers and thanks...

[mrbell]

Do you mean you want completely open-loop EFI? It can be done, but why bother? A major advantage of EFI is being closed loop so the system can tell how far off optimal it is and adjust. Completely open loop is just an electronic carb...

[speedy]

no...its not that,,,
the donor I got , the lamda is not on it,so it burns a lot of fuel...
I thougt maybe you could replace the lamda whit a resistor or something
like that...
or is it beter to place a lamda??

[mrbell]

I would say it's better to replace the sensor. I'm not certain on this particular setup, but the ECU usually isn't happy unless the O2 sensor reports a swing back and forth.
Basically(this isn't so anymore, but I bet in 93 it was), EFI systems have a very hard time targeting exactly stoich. So they'll slightly overfuel, pick up the discrepancy, and reduce fuel, which invariably cause a slight lean condition, so they'll bump fuel up. So what you see on an O2 sensor is the voltage will swing back and forth. The ECU expects this and if it doesn't see it will not really know what to do.
There are devices to replace the sensor, but as I've already stated, I think that's silly. Just get a proper, working lambda sensor.

[speedy]

thanks....
is there a good or bad place to put it?
there is a mk1 manifold on it.. so I can pick the place where to put it..

[mrbell]

That's a good question. I'm not sure what the Mk1 manifold looks like, but my manifold has a boss in it, probably 20cm from the head flange. You don't want it too far, or the readings can be off or slow. You don't want it too close, or you might burn it up! How's that for helpful?
I'd say, you should put it as close to the head as you can where you can get a combined reading from all 4 runners. So right where they join up, if your manifold is different than mine.

[ed4ran]

This is a mk1 manifold

http://homepage.ntlworld.com/gary.heritage1/Pics/swiftmini/03.JPG

maybe worth modifying the steel bottom section on the exhaust so the 2 pipes are joined and you have the lambda sensor off the side?

[mrbell]

That looks exactly like my later manifold except the round boss at the bottom is where my O2 sensor is. It will straddle the two secondary runners. It's close enough to heat the O2 sensor up quickly, but not right at the head, so it won't burn up. I'd drill into that! sounds like fun, drilling and tapping thick cast iron.

[ed4ran]

Problem is with the space in the front of a mini it may end up sticking out the grille, which is why i said take it off to the side, as well as welding the steel pipes just below it.

[mrbell]

Hrm... Good point. I haven't fitted my motor yet so I haven't hit that wall yet...

[speedy]

well guy's ...

that will work just fine ...
i will mod the the downpipe from the manifold...
and put it there... if there is no kat,is no problem???
I would think not?

[speedy]

hey ed4ran...

are you fixing a g13b on a mini gearbox???? :shock:

[XEValver]

hey ed4ran...

are you fixing a g13b on a mini gearbox???? :shock:

its one of his little sideline projects 8)

[ed4ran]

lol, yep a little side project, but is in the suzuki project section :D

[speedy]

you think it will hold???

[ed4ran]

yep. :lol:

[ed4ran]

That is what the rope is for 8) :lol:

[speedy]

you're a very funny man... :lol:
how would you do that with dropgear and stuff??
is it just to see if you can pull it off??? 8)

[ed4ran]

Its all explained in my project thread,
Basically it will end up having an adapter that will allow the use of the standard mini transfer gears.

Its really to make the conversion easier.
Once i get it working i should be making a few more dependent on interest. :wink:

[speedy]

i think I got some reading to do.... :oops:

btw...I got hold of the number from a guy who makes driveshafts..
he charges 280 euro for a set... custom made...think its a bargain...??
he garantees 1300 nm

[ed4ran]

:shock: COOL 8) That does seem like a bargin!!
Ill be looking for some proper driveshafts in a bit.

[speedy]

that guy makes them for a lot of racers...
he even build them for the spijker le-mans cars...

[Swiftmini]

We make alot of pto shafts for tractors etc at work. If someone knows the spline dimensions i can see if we ave the tooling here to make shafts :lol:

[speedy]

did you make them yourself for your car???
the must be wel ballanced...i think??

[ed4ran]

I welded both mine and my brothers, his are made better, but mine seem to be holding. :oops:

[ed4ran]

I think swiftmini has welded his too.

[speedy]

i think that mine are going to be made...
just to be sure... i hate it if it would shake ... and maybe even break...

[ed4ran]

Mine nor my brothers seem to shake, but i have broken one before, although welder used wasnt powerfully enough, and they have been fine since using a better one (almost double the power). :lol:

But i would like some made, just because it is the one thing that worries me.

[ed4ran]

Although i would also like an Alloy flywheel, but they cost a bit :(
Maybe just see about getting mine lightened. :? (or get a spare and have that done)

[Swiftmini]

Yes mine were also welded into a sleeve.

I think they were only about 240mm long so they shouldn't be to bad for balance.

With mine i machined the to parts of shaft to make true.

Then i made up a stepped sleeve, as mini shaft was half a mm or so bigger.

Then i heated the sleeve and pressed in the shafts.

The shrink fit alone would probably hold.

The shafts were then welded into the sleeve by a coded welder where i work.

Kev

[Swiftmini]

Flywheels would be nice to make :lol:

Have know idea how much the materials would cost :shock:

especially if you had to by it in 6 metre lengths :lol:

Kev

[ed4ran]

:shock: That would be one huge bit of metal :?