[thefirstblusuki]

does anyone know if a second gen 1.8 needs a/f adjustment after mods have been done ie:header, exhaust, intake etc.
i have most bolt-ons and i´m wondering about comp tuning.
can you advise me what to do next.
i have a a/f gauge on the a-pillar and she seems to run a-bit rich, and i notice a slight hesitation off idle. wires plugs and all are good, he has a timing advance, and the plugs are at .040 as of now. any ideas? :-?

 

[siragan]

explain your hesitation off idle problem...

 

[thefirstblusuki]

well- idle is good no dead spots, just a pause if you mash down the throttle. like a bogg on an old rochester 4barrel, it´s hard to explain- if idling and you step down on the gas it sputers then revs up- if you push down the gas slower to the same spot it´s not as bad (still sputers but a shorter time like a split second)that´s why i think it´s an adjustment, it hasn´t gotten worse over time just after installing bolt-ons. i´m lost- - ->love the angel eyes, thats what a gear head used to be- a fabricator. these days people just bolt stuff on and call themselves talented.

if love is lost, dude wheres my car

[ This message was edited by: thefirstblusuki on 13-03-2003 13:48 ]

 

[Beaverboy]

Is your A/F meter hooked up to the same oxygen sensor as the car´s computer? In other words: are you sure the computer´s getting a proper 02 sensor signal?

 

[siragan]

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13-03-2003 at 13:25, thefirstblusuki wrote:
love the angel eyes, thats what a gear head used to be- a fabricator. these days people just bolt stuff on and call themselves talented.

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Thanks for the kudos... believe it or not, that pic was just photoshopped by me to get a feel for what it should look like, but now I´m ACTUALLY doing the project. If I can get a hold of my friends 4.0MP DSC-psomething camera, I´ll do a how-to and beg egtdude if I can post it up on feoa so people can see how I did it.

The angeleye colors will be a steely blueish/white color and powered by nichia leds, so it´s gonna be trick. I´ll probably put a little bit of RC car window tinting spraypaint on the lenses to blend them into my already black GT.

And I don´t recommend hooking up any A/F meters to your o2 sensor... there is resistance associated with the meter, and that will cause a voltage drop and thus make your ECU think that you are running differently then you are...

 

[Trashknight]

Then how should you hook up your A/F meter?

 

[thefirstblusuki]

ive got the meter hooked up at the ecu.
at adle it´s steady, but at cruise it fluctuates(i know thats not how it´s spelled)

 

[Juggernaut]

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13-03-2003 at 17:57, thefirstblusuki wrote:
fluctuates (i know thats not how it´s spelled)

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actually, that´s correct but you spelled idle wrong :-]

 

[Beaverboy]

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Then how should you hook up your A/F meter?

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[/TD][/TR][/TABLE] To another 02 sensor farther downstream (prefferably).

 

[thefirstblusuki]

DOH! yeah i knew somthin wan´t right haha. :-D
so beav you mean install an another sensor downstream, but wont the gas be different further down the ex-pipe? (improper reading)

 

[Beaverboy]

Sorry, I´m being vague.

Normally people hook up their A/F meters to the ecu wire like you have. The problem with this is that it is usually only accurate at idle (slightly rich) and under WOT (where it should be rich). Cruising, the meter will fluctuate wildy. So it actually sounds like your A/F meter, and mixture, may be just fine.

By installing a 4 wire (self heating) 02 sensor you´ll get a more consistent reading. You´ll also need a 4 wire sensor anytime you´re more than 18 inches downstream from the head. So, when you installed the headers.. where did the oxygen sensor go? The collector? Is it further than 18 inches away? I´ve yet to take a look at a scort header :-?

What kind of an intake did you install? Is it a long pipe cold air intake? That bog could be the effect of having a longer intake track resulting in a bit of lag as the entire column of air inside accerates. Some long intakes use a larger air chamber close to the throttle body so that there´s a full gulp of air already waiting when the butterfly is thrown open.

For instance, this is a 95-96 subaru engine with a stock intake pipe:

Owners complained about the throttle response.. when they stepped on it it would stumble/bog before taking off. Subaru addressed the issue by creating the following intake:

What do you think?

 

[thefirstblusuki]

sup beav, thnks for the help.
the header has an o2sensor fitting coming right off the flange exiting the head, as far as the intake: it´s the k+n kit which basicaly uses the stock tubing minus the resonator tube that goes along the radiator, with an adapter to fit the cone filter after the VAF meter. mounts very nicely in the same path and location as the original.
thanks again for your attention to detail, it covered every aspect i thought could be a problem.
btw what subaru was the first pic of, it looks like the motors in the trunk haha.