Zetec throttle response.

[magnusfeuer]

Here is a mapping question from California.

 

I have a Zetec that always had a lousy blip throttle response from idle. Higher up it is OK.

 

I've added a supercharger, (www.californiacaterhamclub.com/gallery), but this problem existed before it was installed.

 

When I blip the throttle I can hear a sharp intake of air through the throttle body, but it takes about 0.2 seconds for the engine to respond.

 

I run a Pectel T6 (with a wide band O2 sensor) equipped with a home brewed map.

 

The engine idles just fine and nice.

 

I've played with transient fueling at different levels with different ramps, to no avail.

 

The only way to get a better throttle response from idle is to run it so rich that it starts to smoke (Lambda at 0.80) and sound like a Harley. Not really an altenative.

 

I haven't messed with this lately, so the details (such as idle valve management, etc) are a bit hazy. If this topic raises any interest, I'd be happy to dive into it again.

 

Thanks!

 

/Magnus F.

magnus.feuer@californiacaterhamclub.com

 

[Tight fart]

Can you check the air fuel ratio?

Had my Zetec on a rolling road recently for similar problems to yours.

They had one look at the AFR and said no wonder.

After remaping it's been transformed.

before here and after here

 

 

pics here

www.p1spot.com

 

 

 

Edited by - Tight fart on 4 Oct 2004 18:30:32

[magnusfeuer]

Yes.

 

The wideband oxygen (lambda) sensor lets me monitor the air/fuel ratio as I drive.

It currently gives 0.88 at idle, which is maybe a tad rich, but should be OK.

 

Transient fuelling is another issue. This is the ECU equivalent to the accelation pump on a carb. I've tried different settings to no avail.

 

I am thinking that maybe advancing the ignition would help.

 

/Magnus F.