Maxou88 - I think you tried to send me a PM but there was nothing in it. I'm assuming you were going to ask me the questions you put in your post above.
Here is my target AFR from the PCV:
This is what I am working with at the moment.
Notes:
1. I plugged in 13 for the 0% throttle position to even out the idle and it works well.
2. I have leaned out my usual cruising area, 4,740 - 5,250 rpm at between 2% and 15% throttle opening. I may have over cooked it by .2 or .3.
3. Don't get too hung up on small differences between AFR target maps. I reckon the bike would run great at anything between 12.9-13.6 across the whole range - give or take.
4. The DynoJet Autotune is basically monitoring the exact AFR from the exhaust (you need to have installed the wideband O2 sensor in the exhaust) and will adjust the fueling completely independently of the ECU. So it doesn't really matter what the mapping is in the ECU (in the TPS maps or the IAP maps), the Autotune (and or the subsequent PCV map that it creates) will overide it all until the AFR reaches your target. This is why I prefer to use the PCV rather than just flashing the ECU with new maps. It's like I have a dyno permanently installed on my bike, making it's own adjustments as I go.
5. I'm in the early stages of tuning this bike and playing with all the options. But I ran this target AFR for 2,500 miles while riding through Spain and the cruising was a joy. Turbine smoothness and instant snappy response when you need it. I haven't yet put this set up on the dyno so I can't give you figures for torque or HP. But for me, these figures are less important than rideability. I will tune for peak power after I have the ride I want.
6. I am throwing more fuel in the motor at cruising especially, but I was still managing around the 50 MPG (British Gallons) mark. But I am very mechanically sympathetic, so I am not thrashing the motor (except when I was seeing what speed the bike would do in each gear before the rev limiter kicks in - I only got up to gear 4!).
I am using the 2015 Suzuki GSX-S 1000 Fuel Map for the PCV as supplied with the equipment when I purchased it in the UK (purchased in September 2019).
I then populated the AFR map - although it may have come already populated, I forget - at least I changed some of them slightly.
Here is the original fuel map supplied with the PCV:
The PCV takes this fuel map, and adjusts the fuel to the target AFR. In the process, it creates a Trim table, which is a measure of the adjustments it has made. My one, after 2,500 miles, looks like this:
You can see on this trim table, that the system is chucking in a lot more fuel. Almost the same numbers as the fuel that is being taken away by the Fuel Map (PCV fuel map) on the first instance. Weird eh?
(I suppose it would be quite reasonable to start with a fuel map containing all Zeros. The Autotune would still create the trims necessary to reach your target AFRs. I will try this at some point, just for the heck of it)
There is a magazine article about how this particular PCV fuel map was written. The mapping was done by the DynoJet guys in UK. I met the guy who did it (I bought a DynoJet Dyno from him). See the article here:
https://www.superbike.co.uk/article/suzuki-gsx-s1000-fuelling-graphs
The thing that I don't get is this; they say it runs lean at the smaller throttle openings (see the graph in the article for 15% throttle opening) but then the fuel map they supply, clearly takes even more fuel away at these low throttle openings. So their fuel map takes away 9 fuel at 5,000 rpm at 15% throttle opening. My Trims map shows, that in order to obtain my target AFR at that position (13.8), it requires plus 10 fuel. I can't figure that out. They take fuel away and the Autotune puts it back in!
I emailed Frank at DynoJet UK and you can see his response (email format - so my question to him is underneath his response):
START
Hi Richard,
When the bike is tested as standard, the stock o2 sensors are still being used, so the bike is running in closed loop. This means that the bike is not running solely off the base fuel map in the ECU, but the fuel trims governed by the o2 data. Once the sensors are disabled, the bike will then run off the base fuel table. It just so happens that when you take this bike out of closed loop, it actually runs rich in the areas when it would be running lean. As we are now in open loop, the Power Commander map works over the base ecu map to correct the fuelling.
The difference between the stock map and your autotune map is most probably just down to the individual bike. The beauty of the Autotune is that you can rely on it to keep the bike running perfectly, and like your demonstrating, you can see what changes are being made.
Best Regards,
Frank Jnr
Dynojet UK Ltd
www.dynojet.co.uk
On 19/11/2019 12:04,
info@dynabike.co.uk wrote:
Frank
Really loving the Autotune and the whole PCV set up. Did 2,500 miles in Spain and the cruising was a joy.
One question (there’s always one right?):
The PCV map I got with the PCV (shown below) for the GSXS 1000 shows lots of negative numbers across the board. Taking fuel out of the OEM map.
But when the bike was tested by you in Preston and reported in Superbike magazine(shown below), it shows how lean the bike was running, particularly at lower TPS.
So I don’t understand why a lean running bike would have fuel removed.
When I run Autotune, all my fuel trims show loads of fuel being added back in. Presumably because the DynoJet PCV fuel map takes fuel out and the original map is already running lean. My results (below) show that Autotune is running great, putting the fuelling back to where it should be. And it works a treat. The bike loves it.
But why does your map take fuel out in the first place?
Or have I got something wrong?
Greetings
Richard Board
Tel: 07812 636119
www.dynabike.co.uk
www.facebook.com/dynabikemobile/
END
I'm not sure I am any the wiser. All I can say is that the bike is running great. Must have something to do with the original narrowband O2 sensor as he says.
If you have the same set up as me, do you have the map switch installed? This is the way to test the bike. I have the map switch set up to turn the Autotune map on and off. So you cruise at 80 mph with the Autotune on, then switch it off as you travel. Then you can see the difference! Blimey. With the POD-300 display, you can also see the AFR jump about too. Even on idle, I can see that when I switch the Autotune on, and it reads my target AFR map, the AFR meter immediately jumps to the target AFR of 13 and idles like a peach.
It's great fun to see it working in front of your eyes!
Greetings
Richard