Tuning questions I didn't know I had

[stopintime]

Maybe it's time for some engine tuning mods.... (S2R 800, Termignoni, DP ECU, open throughout, no O2-sensor)

I would like to get TPO Parts BeastR PODS. The Italian bikes shop I was asking, PC and Nemesis qualified, says the fueling adjustments on the DP ECU does nothing for fuel other than on idle revs. Is that true I thought the adjustments were done at idle, but gave more or less fuel throughout - just with no custom variation.
The advertized, or any power increase will depend on more fuel above idle, won't it?

Regardless of the above, a PCIII might be agood idea....... Which brings up the question: does it affect fueling under
4-5.000 revs? I thought I knew this, but the same shop talks about optimizing fueling throughout the entire range with the PCIII.

Finally - will a PC need to be adjusted regularly? I mean, if I take my bike to be serviced with the TPS and CO (?) will that require a new PC tune as well?

[brad black]

the dp ecu idle trimmer is the same as the std ecu trimmer and effects the whole range.  but it is a pulse width change, not %, so has more effect at shorter pulse widths and less at longer, so less % change at higher throttle and rpm.  it's not a very useful way to tune.

pc3 can change the whole map.  download the pc3 software and have a look at the maps.  rpm ranges from 750 to 16,000 or so, so you have plenty of scope.

if you get the tps reset, the idle mixture set, have a clean fuel filter and no other sensor or engine issues before you get the pc3 tuned then it will not need any changes.  if you don't then if someone does change the tps, idle mixture, replace the dirty fuel filter, etc, then your pc3 map will possibly be off.  get the cam timing done before doing the pc3 too.

[stopintime]

Thanks Brad,

The cams are first in line along with the PODS.

Were the "PC-nothing-under-4-5.00-issues" related to closed loop and/or a US specific issue?

Pulse width = time between or length of injections?


About your last paragraph: at a service where I would need TPS, idle a.s.o. (if at all) - then things would be brought back to were the PC tune is happy again/expects it to be - is that what you're saying?

[brad black]

Thanks Brad,

The cams are first in line along with the PODS.

Were the "PC-nothing-under-4-5.00-issues" related to closed loop and/or a US specific issue?

Pulse width = time between or length of injections?


About your last paragraph: at a service where I would need TPS, idle a.s.o. (if at all) - then things would be brought back to were the PC tune is happy again/expects it to be - is that what you're saying?

pulse width is length of injection.

service would bring tune back to where it was, like it does now without the pc3.  assuming it's done the same, of course.  if the pc3 map has fuel changes in the idle area that will screw the trimmer setting up next time.

[stopintime]

pulse width is length of injection.
.............

So, upping the fuel lengthens every spray, but the frequency of them stays the same, right?
Correct me if I'm wrong, but doesn't that mean that an increase in fuel will be more noticeable in high ranges than in low?

 

[ellingly]

So, upping the fuel lengthens every spray, but the frequency of them stays the same, right?
Correct me if I'm wrong, but doesn't that mean that an increase in fuel will be more noticeable in high ranges than in low?

 

Pulling some numbers out of my arse for illustrative purposes, but that's not the point here.

Let's say the increase added at idle is 1 ms (which is what brad is saying: it's a fixed amount, not a proportion).

And then theoretically, at idle, it normally runs 25 ms pulse width anyway. So it's now 26 ms, or an increase of 4%.

Now, at higher revs, we need far more fuel, so the standard pulse width might be, say 250 ms. Add our 1 ms we added in everywhere and it's now 251 ms. This is only an increase in fuelling of 0.4%.

[stopintime]

Let's say the increase added at idle is 1 ms (which is what brad is saying: it's a fixed amount, not a proportion).

Now I get it Thanks Oz guys!

[Speeddog]

As far as the PCIII is concerned, there's the 2 types, at least here in the US.

The street legal PCIII-EX, which doesn't allow changes to the mixture below some RPM and throttle %.

The regular PCIII, not street legal, that allows changes everywhere.

[stopintime]

As far as the PCIII is concerned, there's the 2 types, at least here in the US.

The street legal PCIII-EX, which doesn't allow changes to the mixture below some RPM and throttle %.

The regular PCIII, not street legal, that allows changes everywhere.

That sounds logical, because I really can't get anything other than "huh?" when I ask techs here in Europe about the PCIII-EX specific issue. (didn't know the EX name though)