Triumphrat

1BAD02RT · 02-21-2010, 01:24 PM

Hello all,

I'm not quite sure whether this is a problem with the PC or the throttle cable itself. When I give the bike a bit of throttle, the revs slowly build but when it hits 3000 rpm, the engine revs much quicker. I rode the bike and need to get this fixed, as when I take off the bike launches because the revs jump up so high! Any ideas, post em up! I loaded the stock tune back onto the bike and it didn't change anything......

Next step is to bypass the PC injector plugs and see if that changes anything!

FYI, The only thing I adjusted on the throttle cable is the adjustment near the bars that controls how much throttle pull before the bike starts revving.....

BombFactory · 02-21-2010, 03:50 PM

Was this issue happening before you installed the PC? It sounds like it is running lean.

1BAD02RT · 02-21-2010, 04:29 PM

I completely disconnected the PC3 and it still does it. I did notice that a vacuum line from the airbox to the "distribution block" was off. Does the bike have to relearn or the computer be reset?? My only thought is maybe the TPS lead wire from the PC3 could change the voltage the engine computer sees and therefore changes the fuel mixture it's supposed to get? I know some sensors can be really sensitive to tapping other wires into them, but if this was the case I'd think that Power Commander would have a remedy for this!

One thing I also noticed is a gray plug with a clip similar to the injector clips just sitting there, not plugged into anything. I'm guessing it's something the tt600 platform used but not the Speed Four? Please clarify.......

Check out the video I took tonight of what the bike is doing! Barely ANY throttle and the revs jump up really quickly!
http://www.youtube.com/watch?v=ZIqeabbVjw8

Another video I took, with a 2nd gear power wheelie (no clutch)! This bike is quick, just need to get the throttle situation remedied!
http://www.youtube.com/watch?v=w9pxZcodxds

Will · 02-22-2010, 01:36 PM

A vacuum line off will wreak havoc with the way the bike runs. Heat it up three times and it will learn all it's going to learn. You may have to reset everything electronically.

I can't tell you much of anything about Power Commanders, since I have never used one, but I can say monkeying around with the injection and timing maps can have occasional unintended consequences.

The infamous gray connector is for California emissions devices. It's also there to confuse everyone else. It works well at its intended function.

GutChkTT600 · 06-16-2010, 02:53 PM

How did you hook up the power commander to the bike. ( I am having trouble with the little grey wire that is supposed to be tapped into another wire but cant find the color that is described.)

kubbie · 06-16-2010, 03:03 PM

Man my TT's ran like that for so long its not even funny anymore. I say it's in the maps from Triumph. PC hooked up/unhooked/stock exhaust/Micron exhaust/factory air filter/K&N filter and 3 different maps, still runs like that.

Try slipping the clutch with throttle a little more makes the transition smoother.

Will · 06-17-2010, 11:59 PM

If it's surging, it's not tuned right. A properly set up TT600 does not surge. You will have to increase the fuel idle trim, AKA CO setting. A Power Commander does nothing at all for the issue you are dealing with. You will have to use TuneBoy or the Triumph factory tool.

DEcosse · 06-18-2010, 05:39 AM

Quote:

Originally Posted by Will

.... A Power Commander does nothing at all for the issue you are dealing with. ...

Sure it can - you just have to dial the fuel trim map in a bit richer at the affected region.
Slightly different approach from the idle trim adjust (CO) in Tuneboy/Gameboy - just applies the trim differently. Same net result.

Everyone (OK .... many) seem to expect a canned tune to be perfect out of the 'box' - well, all devices are not created equally (injectors, camshafts, etc) - but one of the big advantages of having a PC3 is that you are seriously spoiled for choice in getting it dyno tuned, vs those who would look at you strangely when you mention Tuneboy.
Just make sure the operator is doing more than just full throttle runs and dialing in the whole spectrum.
Oh - REALLY important to do the TPS calibration for the PC3 (not the Bike cal, the PC3-TPS cal - read the manual )
Also, download & activate the Accelerator Pump feature - that is good for an extra 'shot' when you whack the throttle.

Will · 06-18-2010, 01:55 PM

Yes, you are correct about correcting it with mapping, but it's an end around instead of a direct fix. It's also going to be more of a headache over time, in my opinion.

My experience with canned maps is they don't work too well. I have a map supposedly tailored for a Jardine can in my 675, which has a Jardine can. It runs very badly in certain rpm ranges, and I plan to reload the Triumph map and be done with it.

BombFactory · 06-18-2010, 02:18 PM

Correct me if I'm reading PC's website incorrectly, but from what I know, through a screenshot on PC's website showing what cannot be adjusted on these systems, one cannot adjust the fuel trim at idle with a PC to compensate for an improper CO setting.

Just to give my opinion on PC in general before anyone goes out to get a PC III at a discount now that PC V is out, PC III's inability to adjust ignition timing on Triumphs makes it an inferior tool. Ignition timing, as far as power and superior running conditions go, is more important that fuel trim. The PC can richen the crud out of the fuel map as much as it would like, but it is confined to working within the ignition timing already given; the timing controls its range. The problem is the giant gap in timing before 6,000 rpm and the other emmision-standard dips after 6K rpm on the TT600/S4/D6 maps. No matter how much richening PC does, it cannot richen the mixture past what the low timing curve at those rpms will allow. Because of that, PC acts more as a band-aid to what should be properly tuned at a timing and fueling level. It would be a waste of money for someone to have their engine dynoed with PCIII, as the technician is physically incapable of tuning the engine for maximum power and performance due to the timing.

PC V supposedly allows for timing adjustment, bringing it more up to par with TuneBoy. Regardless, it is the same price as a complete TuneBoy setup, with the ECM key, but it lacks the diagnostic capabilities that TuneBoy has. I'm not sure why anyone would spend the same amount of money on a PC V with less options than a TuneBoy that has more options, even if it costs more to have a TB map polished on a dyno.