Triumphrat

Hornblower · 08-12-2007

With the TORS, cat bypass, and triple K&N's I am running custom tune # 20050_3 from TuneBoy. Wayne, at TuneBoy, mentioned this should be a good starting point. Now, that I have thoroughly test riden the bike, there is no question that the power and torque have significantly increased.

A couple of times I noticed backfiring through the throttle bodies as I blip the throttle while downshifting. I'm assuming this is being caused by a lean condition at lower RPM's. When this backfiring occured, the air temp was in the 90's. In addition, I have Baker Air Wings which were directing a lot of air flow right on the triple K&N's. So, I'm wondering if these two conditions could have added to the fuel mixture getting lean. So, my question is; has anyone gone into the 20050_3 tune and richened it up a bit at low throttle positions? If so, I would be very interested in the tune you ended up with. If fact, any comments anyone would have concerning this would be greatly appreciated. Thanks-Ken B.

Pig9r · 08-12-2007

Backfiring through the intake happens every once in a while to me and I don't think it's attributed to a lean condition. My A/F ratio is 13.5 to 1 and it still happens to me. However exhaust popping on decel or afterfiring is a sign of a lean condition.

DougL did some datalogging a while back and this "recipe" that was created and has worked very well for me and some others in reducing the afterfiring.

http://www.r3owners.net/showthread.php?t=1804

Hornblower · 08-12-2007

Quote:

Originally Posted by Pig9r

Backfiring through the intake happens every once in a while to me and I don't think it's attributed to a lean condition. My A/F ratio is 13.5 to 1 and it still happens to me. However exhaust popping on decel or afterfiring is a sign of a lean condition.

DougL did some datalogging a while back and this "recipe" that was created and has worked very well for me and some others in reducing the afterfiring.

http://www.r3owners.net/showthread.php?t=1804

Pig9r--If it's not caused by a lean condition, what does cause it? When we had carbureted engines, there was an accelerator pump to add that initial bit of extra fuel when you suddenly gassed it. What it feels like now is that it needs some extra fuel when I suddenly "blip" the throttle. That's why I was suspecting some leanness. Also, I wanted to mention that not all, but most of the decel popping went away with the new tune. I'm really OK with that part of the mapping. To fix my problem, I'm just wondering where to increase fuel if, in fact, that would help at all. One of those backfires through the intake caused my engine to die, so I really do want to work on this aspect. Thanks-Ken B.

Will · 08-12-2007

I am not familiar with R3 codes and mapping, but you could look for fuel idle trim. It may not be there, but if it is, increase the value and it will richen the mix at low rpms and help with a lean condition at low revs.

Pig9r · 08-12-2007

I have had the occassional backfire through the intake with the underseat filter, undertank filter and triple filter, all when just blipping the throttle a bit. After a custom dyno tune, it still does it on occasion and like I said earlier I know I am running at 13.5 to 1 A/F ratio so I am not lean. If you do a search here or other rocket forums you will find others reporting the same. In fact that is what probably caused the infamous Uni-filter fire of 2006.

The afterfiring issue was somewhat easy to resolve because it was with closed throttle positions. And richening it up at lower RPM ranges and closed throttle positions is what solved it. However get too rich at small throttle openings and the bike will get very jumpy and difficult to ride at parking lot speeds.

When you blip the throttle you are in the F maps probably about at about 25% to 50% throttle opening so adding fuel at lower RPMs won't help. I don't think you want to add a bunch of fuel there because once again it will have adverse effects on other riding conditions. An accelerator pump would only benefit at WOT anyway. The PCIII has an accelerator pump feature but my dyno tuner didn't recommend it.

If anything it might be related to a timing issue, however I think it is just the nature of the beast. However do some experimenting. There were several times I had to push my bike back to my garage because of trying to resolve one problem and I ended up creating several more, that is part of the fun.

Hornblower · 08-13-2007

Thanks Pig9r--Everything you said makes sense, as usual. You're right too, that I also experienced the intake backfiring, just occasionally as I blipped the throttle, ever since the bike was new. So, it's not something that my TuneBoy tune has created. I was hoping that the custom tune would eliminate that but it didn't. I went out again and tried a little less abrupt blipping and no problems. I guess I'm going to have to be a little more careful with that blipping stuff. Otherwise, the bike runs great and the power delivery feels very smooth from bottom to top. BTW, are there any other custom tunes out there for my setup that would be worth trying? From your earlier comments, I get the impression that you think the 20050_3 is pretty good as is. I haven't decided yet to alter the fuel tables in that tune to eliminate the decel popping but I may experiment with that later. Thanks again-Ken B.

Pig9r · 08-13-2007

Ken- If you remove the O2 sensor use a M18 oil drain plug to fill the bung.

Hornblower · 08-13-2007

Hey Pig9r--You are the man with ALL the answers! I'm going to have to put you on retainer if this keeps up. Thanks for that answer. I'm headed to Advance Auto right now to get one of those plugs. Thanks again-Ken B.

Hornblower · 08-20-2007

Quote:

Originally Posted by Pig9r

Backfiring through the intake happens every once in a while to me and I don't think it's attributed to a lean condition. My A/F ratio is 13.5 to 1 and it still happens to me. However exhaust popping on decel or afterfiring is a sign of a lean condition.

DougL did some datalogging a while back and this "recipe" that was created and has worked very well for me and some others in reducing the afterfiring.

http://www.r3owners.net/showthread.php?t=1804

Pig9r--Do you know where this tune was first posted? Or, better yet, do you know where I can download it? I am having trouble making out some of the numbers in the shaded areas. Also, when I start with the 20050_3 tune, some of the values shown, that I can read, have not been increased by the 10 or 15% stated. That confuses me a bit. I sent a PM to Dougl concerning this too but haven't heard back yet. I guess what I'm concerned about is whether you and he started with the 20050_3 tune, as a base, and applied the 10% and 15% increases based on that. Thanks for any light you can shed on this. --Ken B.

Pig9r · 08-20-2007

Don't go by the values in the map because they are going to be different for each cylinder. Just make % changes based on the shaded areas (yellow 10% pink 15%). It doesn't have to be exact either, those were just the areas that Wayne from Tuneboy recommended.

I started with 5% and 10% then went up from there. Some have gone as high as 25%.

A quick way to do it is highlight a block of the area you want to change and hit F8. Then you just have to enter the % you want to change. Make sure to do it for each of the L1, L2 and L3 maps.

If you still have problems, pm me your email and which tune you are using and I'll send you a tune with the changes made.