4396 replies to this topic

[oakmere]

When doing the fuel learn the car is locked in 14.7:1 air fuel ratio so is running lean when you stick your foot down. This will give a very clean exhaust. When you go back to the normal running map your AFR map will control open loop fuelling. Have you tried changing your AFR? Remember the lower number is richer. My WOT AFR was set at 12.4 by Peter so I changed this by .2 each way but got no improvement. You would change the 90 - 200 map readings same as ignition.

[CHILL Gone DUTCH]

When doing the fuel learn the car is locked in 14.7:1 air fuel ratio so is running lean when you stick your foot down. This will give a very clean exhaust. When you go back to the normal running map your AFR map will control open loop fuelling. Have you tried changing your AFR? Remember the lower number is richer. My WOT AFR was set at 12.4 by Peter so I changed this by .2 each way but got no improvement. You would change the 90 - 200 map readings same as ignition.

This might be my next lesson, Fancy a visit one night

[Exmantaa]

When doing the fuel learn the car is locked in 14.7:1 air fuel ratio so is running lean when you stick your foot down. This will give a very clean exhaust. When you go back to the normal running map your AFR map will control open loop fuelling. Have you tried changing your AFR? Remember the lower number is richer. My WOT AFR was set at 12.4 by Peter so I changed this by .2 each way but got no improvement. You would change the 90 - 200 map readings same as ignition.

 

Your 12.4 sounds like the AFR number for an NA @ WOT? Supercharged engine need a bit richer mixture to keep things together, so aim for ~11.8 AFR. 

[CHILL Gone DUTCH]

Oakmere is a NA

 

here are my target AFR

 

 

[Exmantaa]

Nice 11.8's.

 

Do you have a wideband fitted to monitor the WOT mixture?

[CHILL Gone DUTCH]

No but planning on putting one in over Christmas

[NickB787]

Nice 11.8's.

 

Do you have a wideband fitted to monitor the WOT mixture?

I was going to ask that exact question I will have when I do mine so see if it makes any difference

[CHILL Gone DUTCH]

Nice 11.8's.   Do you have a wideband fitted to monitor the WOT mixture?

I was going to ask that exact question I will have when I do mine so see if it makes any difference

Makes a difference to what ???

Edited by CHILL Gone DUTCH, 01 July 2013 - 06:34 PM.

[NickB787]

I don't know myself, I wonder if it will make a difference or not?

[CHILL Gone DUTCH]

Are you going to use the egr valve connections

[NickB787]

yes I have a wideband i brought some time ago so will wire it up

 

reading a basic explanation it depends on how good the ecu is

 

 

Narrow Band

• A narrow band, or zirconia, oxygen sensor is a sensor that uses two electrodes and an oxygen-reactive fuel cell to create an electric current. The strength of the current is proportional to the amount of oxygen in the cylinder. The Engine Control Unit (ECU) can analyze the electrical data that the sensor gives it and adjust the amount of fuel used to run the car efficiently. If the ECU is old or poorly designed, it will show in the vehicle's gas mileage when compared with other cars.

•  

Wide Band

• A wide band oxygen sensor is very similar to a narrow band sensor, the only difference being that it also has an electrochemical gas pump attached. The wide band sensor can process its own data and takes the place of the ECU in determining the most efficient amount of fuel to use. This cuts out the middleman of the operation and gives the car better mileage. However, wide band oxygen sensors are usually only available on higher-end or performance cars, since they are more expensive and help the car to age more gracefully.

 

Edited by NickB777, 01 July 2013 - 06:44 PM.

[CHILL Gone DUTCH]

yes I have a wideband i brought some time ago so will wire it up

Where are you up to ie are you driving it, is it running

[NickB787]

 

yes I have a wideband i brought some time ago so will wire it up

Where are you up to ie are you driving it, is it running

 

 

 you kidding

 

 it's in a zillion bits and the national is 3 weeks away

[CHILL Gone DUTCH]

 

yes I have a wideband i brought some time ago so will wire it up

Where are you up to ie are you driving it, is it running  

   you kidding    it's in a zillion bits and the national is 3 weeks away

It's still late nights

[oakmere]

I can pop around tomorrow chill if you want? You can check if the AFR changes make a difference with a power run same as ignition. Small changes only you don't want to melt a piston! The wide band gives the actual AFR and the software can now tune the map to make sure the requested AFR is correct by using the wide band output. Without the wide band the software calculates the AFR based on the fuel learn narrow band results.

[CHILL Gone DUTCH]

I can pop around tomorrow chill if you want? You can check if the AFR changes make a difference with a power run same as ignition. Small changes only you don't want to melt a piston! The wide band gives the actual AFR and the software can now tune the map to make sure the requested AFR is correct by using the wide band output. Without the wide band the software calculates the AFR based on the fuel learn narrow band results.

Might leave this until the winter incase the worst happens, don't want to do much more with the map until I have been to rolling road to check how accurate the software is (BHP and Torque) as I'm getting close to the limits of my internals The only thing I am going to change is the AFR correction at 98 degrees C make it richer at 98 I don't like car running high temps

[oakmere]

No problem. Happy to help when it suits. The rods are easy to change but it is a head off job but not engine out. With the power you are now putting out rods would be a good investment. Reducing the max rpm to say 6800 would help preserve the originals.

[CHILL Gone DUTCH]

Will keep that in mind when I'm changing gears, Your welcome to come round for a brew if you want, the wife wants me to paint the car the same as yours.

[oakmere]

Lets get the rattle cans out! Joke

[fezzasus]

Do you save all your old maps? I'll be going Dutch in a couple of weeks and would ideally like to jump straight on to a stage 2 map with 3.1 pulley (same as mine) as I suspect the map will need less work to match mine.