How to lean a car out with DHP

[dsmuts]

I'm not sure what to change to lean my car out a little bit. Here is a log and my wb shows about 10.8 ish at wot

 

[heavydtheogre]

usually the map sensor.

 

[matt5112]

MAP?

Oh buddy............

Well first thing: do you have a canned tune?

 

[Pure2sin]

You should really try UVscan instead of the logging in DHP.

Show a screen shot of your: Calibration data>Fuel>PE>Base_PE_AF

That would be where the main changes would be made but before you do anything post a screen shot.

 

[matt5112]

Yeah two ways to go about this:

One: Change PE values in so that you see what you want on the WB.

Note: you may end up seeing some strange things like commanding 9:1 AFR or 13:1 AFR and getting 11.0 on the WB.

Two: Ensure fuel system is setup correctly. Then calibrate MAF so that commanded is the same as actual. Then pick a commanded AFR.

 

[dsmuts]

I have a canned zzp tune I'm starting with

You should really try UVscan instead of the logging in DHP.

Show a screen shot of your: Calibration data>Fuel>PE>Base_PE_AF

That would be where the main changes would be made but before you do anything post a screen shot.

Yeah two ways to go about this:

One: Change PE values in so that you see what you want on the WB.

Note: you may end up seeing some strange things like commanding 9:1 AFR or 13:1 AFR and getting 11.0 on the WB.

Two: Ensure fuel system is setup correctly. Then calibrate MAF so that commanded is the same as actual. Then pick a commanded AFR.

What do you mean by the fuel system being setup correctly? I appreciate the help guys I'm kinda lost right now lol

 

[Pure2sin]

I think you need to do some MAF tuning.

 

[matt5112]

No point in MAF tuning till you figure out the fuel.

From the factory, fuel pressure drops off in boost compared to what it should be. Hence the oddly sloped injector flow rate table.

If you get a fuel pump rewire, that should bring things back up to par. Then you'd run the values from 100 kPa vacuum in both IFR and offset vs pulsewidth vs MAP in all columns.

Or you could just tune around all of that via PE and MAF tables.

Whatever floats your boat.

 

[dsmuts]

What do I do to the maf to tune it. I'm sure I sound like a retard but I'm not sure what to do exactly. I'd like to figure this tuner out a little before I do any other major changes to the car.

 

[matt5112]

HP Tuners Bulletin Board - View Single Post - Open Loop Maf Tuning

 

[dsmuts]

Thanks matt i guess i have a lot of reading to do lol. Does anyone know where i can dl tinytuners?

 

[matt5112]

check the stickies in this section.

 

[dsmuts]

Will do. Research here I come.

 

[dsmuts]

So to do the open loop maf tuning i'd have to log my wb? I can't do that with dhp right?

 

[Pure2sin]

Yes you can. That is what that little green thing is on the side of the box is for. If you have one, but you should.

Green part on the bottom of the box shown in this pic.

 

[dsmuts]

Which part of that do I hook it to and do I have to dl anything to make it work?

 

[darkhorizon]

From the factory, fuel pressure drops off in boost compared to what it should be. Hence the oddly sloped injector flow rate table.

Matt.. you are mistaken here.. that boob had no idea what he was talking about.

Fuel pressure DOES NOT fall off from the factory... if it does then your fuel system went to ****.

Does anyone know where i can dl tinytuners?

You dont need it.

I think you need to do some MAF tuning.

After PE and IFR is adjusted....

Here is a log and my wb shows about 10.8 ish at wot

10.8 is pretty solid for a 3.4 car.. but I would wiggle PE up and down to see if the KR gets worse or better... leaner is probably not going to be the direction you want to head.