Diy Tuning

[gaz097]

I've heard it takes for F#cking ever though.

I'm going to go out on a limb (with no data or experience) and say the only time you would need to manipulate the SD maps heavily is when the boost(to a lesser extent timing etc) curve differs largely from the factory one. Now I don't mean peak boost I mean the way the boost comes on etc. The slopes will give you the injector you need to target a particular af ratio then you can manipulate the tables to fine tune where the curve needs more or less fuel.

Now I could be completely wrong but it sounds good in my head.

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[turbotrana]

Rolex, you got to forget about SD maps and forget about learning anything from Jet (not that he knows anything anyway). The SD maps have all be done by Ford. You are not going to better it with the aftermarket software we have and at moderate boost levels.

Just learn how to tune the slopes first and foremost.

[rollex]

What are the advantages of spending time doing it via the sd maps, does it mean the other correction maps are easiest to adjust opposed to fudging things the get a result?

The reason I'm asking is my car already has a half decent tune most likely via slope adjustment and the whole point of this exercise is to learn and do a better job. Other than taking way more time what are the advantages from someone who has done it? Has anyone on here other than Daryl or jet given it a go?

[Skids4kids]

Why not start from scratch instead of tweaking someone's tune?

If you want to learn start from scratch.

[rollex]

When I looked at "Lambda B1 commanded" I get 1.00, does this value work? O is this not a coincidence that I was seeing ~15-16:1 ratios and my 0.85 lambda should have been commanded if I had set all the base fuel maps to this value?

Also regarding the SD maps if I fudge the low and high slopes, won't this mess with my idle and return to idle and also affect the load calculations as load = airmass/cylinder volume? I'm sure I could then just adjust the "wrong" load cells in the ignition map to get a good result, but surely this will have follow on effects with more and more maps using the "wrong" cells than if I had just tuned the SD maps.

I have years to perfect this so I think it will be the way I approach this. This is a hobby not a car I want running by next week so I'll just do what everyone else does sort of thing.

Why not start from scratch instead of tweaking someone's tune?

If you want to learn start from scratch.

I am starting from scratch. This as as "Stock" as I can get for my car as unfortunately the "return to stock" is my old heinrich tune. I've reverted all of the maps to stock via comparing the tune to various other stock tunes from the repository.

[turbotrana]

You are not fudging anything with the slopes. Altering the slopes is the correct way to tune the car. Altering the SD maps is the wrong way to tune. You don't really want to be playing with the SD maps Ford spent ages doing with full access to tuning equipment and software. For the purposes of what you are doing just forget about SD tuning.

You need to stop making this more complicated than it needs to be. Ford has done the tuning. You are just adjusting the injector data so it puts the tune data where you want it.

It does not have to be perfect. Everything will be OK if you are out by .5:1 air fuel ratio.

You need to start to understand the injector data. High slope deals with fuel delivery just above cruise speeds. Low slopes deals with fuel delivery around idle and very very low load around 60kph whilst on a flat road.

Raising slope leans, lowering richens.

It is a juggling act between these two to get the air fuel ratios you want. You have a good starting point with ID1000 data but its a starting point. You got to adjust actual air fuel ratios to desired and you are most of the way there for a basic injector scale. It involves driving around and observing ratios and when in the ball park you can start loading it up a bit more. If you are in the ball park at moderate load you will be in the ball park at high load provided you have the injectors and pump to keep up.

[DarrylC]

What are the advantages of spending time doing it via the sd maps, does it mean the other correction maps are easiest to adjust opposed to fudging things the get a result?

The reason I'm asking is my car already has a half decent tune most likely via slope adjustment and the whole point of this exercise is to learn and do a better job. Other than taking way more time what are the advantages from someone who has done it? Has anyone on here other than Daryl or jet given it a go?

Rollex, the truth is in the posts above but you need to know what to look for. Here is my advice:

1. Fuel base back to standard
2. ID1000 data
3. Fuel trims back ON
4. Start Car, let it warm up and idle until LTFTs stabilise. Read LTFT data. Your injector will idle on low slope.
5. Using this adjust you low slope until LTFT goes close to zero.
6. Using same factor adjust high slope by same amount. So if your low slope is now 117 the High slope = 114 *117/125
7. Take for a drive and read lambda off the gauge. I am guessing your gauge and MPVI reading have not been aligned.
8. Adjust you high slope until you get your lambda commanded as close as possible to the gauge reading.

Using this method I was able to dial in a mates Bosch 0 280 158 040s in less than 10 mins over the phone.

Many reasons why ID1000 data does not translate but my theory is that 1 litre of 98 weighs ~0.7KG and they use 0.75 as the weight of 1 litre of petrol when converting the data from n-Heptane to petrol.

You should be able to get your lambda very close under full throttle. Leave the SD tables alone and just adjust slope to get close to commanded lambda as possible. Adjust your base fuel for fine adjustment, this will keep your LOAD value the same as factory and you wont have to recalculate these based on the SD changes.

[rollex]

Lets say I set all my maps to 12:1 with no temp correction and run open and data log. If AFRs are flat (but wrong) then I could tune by the slopes by working out the ratio it is out, if it is not flat (eg changes with map/rpm/cam angle) then surely I have to adjust the SD tables or put a commanded lambda in the base fuel table that does not actually match what I want?

Tuning via slopes is fairly easy, I'm sure I can figure out the ratio and get it close within an hour so I'm not worried about how to do that, it is more about learning how to do the full method if I wanted to.

Darryl what made you do a full SD recalc on your car?

So the only two questions I can't seem to figure out from my reading are these two:

How do I log commanded lambda with either VCM scanner or livelink?

If you have a stock car with the only change being injectors and you had absolute injector data (lets just assume for argument it is literally perfect) you should be able to plug the data in and get the same AFR as factory yes?

If the answer is yes what would require an SD map change, exhaust, intercooler, camshafts? I'm guessing the latter definitely but do the former two make that much of a difference?

[DarrylC]

Darryl what made you do a full SD recalc on your car?

So the only two questions I can't seem to figure out from my reading are these two:

How do I log commanded lambda with either VCM scanner or livelink?

If you have a stock car with the only change being injectors and you had absolute injector data (lets just assume for argument it is literally perfect) you should be able to plug the data in and get the same AFR as factory yes?

If the answer is yes what would require an SD map change, exhaust, intercooler, camshafts? I'm guessing the latter definitely but do the former two make that much of a difference?

Two different injectors with different data (LPG and petrol) is the reason. In the end I just used a variable pressure regulator on petrol and upped the pressure to close to 5 bar. Got it close enough for LTFTs on both fuels to be +/- 1%

VCM scanner can log commanded lambda. I use it. SCT has something like lamdbse but you can use the STFT value at WOT.

SD tuning should be used when you make changes but only after you have your injectors dialled in. Much easier to fudge the slopes as long as you don't end up with Fuel trims over +/-5%. Fuel trims at cruise as close to zero as possible. Its very easy to get injectors scaled so that WOT is correct but less easy to get all the cruise trims spot on which is where your fuel economy will come from.

[rollex]

Ok well that raises a question, when I used VCM scanner it showed "Lambda B1 Commanded" and "Lambda B2 Commanded" as 1.00 eg close to the 15-16:1 I was seeing.

If I've forced open loop and set all base fuel maps to 0.85 should I not see 0.85 (+- a bit for temp correction) as commanded lambda? Am I logging the wrong point?

Everything else indicated I had correctly forced open loop (set O2 temp to 2500 deg F) with fuel trims being frozen at 0%. I did however have a fault code of p1131 (lean fault) but that is probably as a result not a cause of anything.

Thoughts? Do I have the wrong strategy or something else in VCM scanner?

Link to tune:

https://www.dropbox.com/s/5h0hw0erti4rayh/Base%20Tune%20-%20Stock%20boost%20map%2025-8-15.hpt?dl=0

Edited 06/10/15 02:53 AM by rollex