| Author | Message | ||
     Youp |
A little while ago I bought a Barker's exhaust and an Erik Buell Racing ECM for my '09 1125CR. I pretty much instantly made a sound video and today it was time for some dyno testing with the different QC's. I wanted to do that to get a little insight in what the A/F ratio does with the different QC's in place. The results are pretty good, at least... I think so...  Here's the sound video: http://www.youtube.com/watch?v=dXX4kX-Pef8 And here's the dyno video (watch the flames spit past the rear tire @ 1:12 and watch the grin on the guy's face...  ) http://www.youtube.com/watch?v=O8i9HKglxZY The torque is in Newton*meter so a little different then you guys are used to, but it's not hard to convert using Google.  Ejoy! | ||
| Youp |
Here's the dyno sheet as an image by the way.  | ||
| Jng1226 |
So what quiet core performed the best? I thought Barker only had 1 optional quiet core. Thanks | ||
| 1_mike |
Jng - I believe they have three different diameters. I know...they have at least two Q.C.'s And just as a note, if the engine runs better "with" a Q.C. in place...the fuel mapping is wrong for an open Barker exhaust. Mike | ||
| Puzzled |
There are three quiet cores available 1" 1 1/2" 1 5/8" The 1 1/2" was the most popular for the last year. The 1" seems to be the popular core this year. | ||
| Youp |
It's pretty obvious that the bike preforms best without a QC, but the black power curve is with the open Barker, the purple power curve is with the 1" QC and the pink power curve is with the 1,5" QC. The torque curves clearly relate to them, so the different colors don't matter. The fuelling is good for all three QC's.With the open exhaust setup running the "leanest" and with the 1" it's running a bit rich. The lambda value for the open exhaust is the "leanest", but with about 0.9 it's still rich enough (0.85 is about perfect for most gasoline internal combustion engines). What is clearly visible though, is that the fuelling is a bit lean when opening the throttle quickly to WOT. Which is perfectly normal for these types of fuel injection. The dyno guy did some static measurements on my request, but they are not in the graph. He held the throttle fixed in one position for a while to see what the A/F ratio did and in every situation it became good pretty quick. It's equipped with a Barker specific Erik Buell Racing ECM by the way. | ||
| Dannybuell |
Excellent and informative thread. THX Youp | ||
| Jng1226 |
Thanks for the information Youp. So I take it the Orange line was the 1" QC? It doesn't look like it gives up that much to the open pipe, until the very top of the power band. So how much was the sound attenuated from the open pipe? Can you estimate as a percentage of the volume of the open pipe? I've wanted a Barker and E_B_R ECM for some time now so this is exactly what I was looking for. Thanks again for posting your results. | ||
| Youp |
@ Jng1226 On the A/F lines, the 'orange' or actually pink line is with the 1,5" QC installed. The dark green line is without a QC and the light green line is with the 1" QC installed. The top end power is something you don't notice between the open Barker and the 1,5" QC and it is slightly noticeable with the 1" QC installed. But the reduced torque below 7000rpm actually is noticeable for the 1,5" QC as well... As is the engine braking, that unfortunately is back when a QC is installed. Slightly with the 1,5" QC and something like stock engine braking with the 1" QC in place. That's something I don't like about it. Power wise the QCs are perfect, but they don't do any justice to the bike's behavior because of the engine braking. I really like the Erik Buell Racing ECM cutting out the engine braking, the bike becomes A LOT more supple without it. Especially under hard braking, turn in and opening the throttle again. It doesn't jerk or get out of balance like it did with the stock ECM. As for the sound, it should produce 107dB @ 5000rpm static when it is open. I think that is not far off, but it is a noise regulation standard and has nothing to do with actually driving around. When driving around with an open Barker, without earplugs, you should anticipate for some headaches every now and then. Yes, it is that loud... The guy filming my drive-by movie said he thought his right eardrum exited his head through is left ear. After a while I let him ride my Buell and as he passed at about 160km/h (100mph) I couldn't do anything but agree... It is literally painful to the ears. With the 1,5" QC in place it should produce about 102dB @ 5000rpm static. It is quite noticeable when it is in. The sound is still the same as it is without the QC, but it is a lot less loud. Don't get me wrong, it is still very loud compared to well... About any other bike, but it surely is not painful anymore. With the 1" QC in place the sound changes too, it becomes a little more "dirty". And of course it is a bit quieter again. In my opinion, this is the sound how it should be when the bikes left the factory. Nevertheless, I always drive around with the 1,5" QC in place. I don't want to compromise the handling and power to much and I do like the sound of it. The 1" QC is a bit to quiet for my taste and without a QC the bike is just asking (or screaming) for trouble. | ||
| Youp |
@ Danny Thank you. I tried to share my experience on this topic as detailed as possible, so that other Buellers (and maybe Buellers to come) can form their own opinion based on this. I know how hard it is to get some good objective information on these kind of topics, and although in the Netherlands, this board helped me a lot making the decision to buy an 1125. And I just wanted to do my part and contribute a bit. | ||
| Dennis_c |
There is a lot of difference between the 1" QT and open exhaust I tried it today. | ||
| Easyrider |
what a lean mixture before the 5000 RPM, very dangerous | ||
| Youp |
@ Easyrider, I explained that. That happens when opening the throttle quickly to WOT, which is pretty normal. If you hold the throttle in a constant position at these rpm's the ECM compensates nicely within a second or so. I reckon this could also have something to do with the reaction time of the wideband lambda sensor on the dyno stand. | ||
| Aseecobra |
Dris & Youp, I have experienced with the OEM ecm and two different Erik Buell Racing race ecm calibrations the acceleration enrichments are too lean for very quick throttle openings causing the AFR to go lean (20:1 afr) and the engine will stumble. Dris: Have you experienced such a stumble with Buell or Erik Buell Racing programs? Is it from sloppy tuning or is there a limitation within the ECM to properly provide the needed acceleration enrichment for a quick throttle opening? Chris | ||
| Youp |
Aseecobra, The bike does not hesitate or stumble at all when opening the throttle quickly. | ||
| Aseecobra |
Youp, Have you ever twisted the grip as quickly as possible? The stumble is very short in duration. After the stumble the engine will continue accelerate cleanly. Drag racing will expose the stumble. Street riding or road racing doesn't expose the stumble because very quick throttle opening is not normally used. I have two CR bikes here that do it. TPS resets do not resolve. Chris | ||
| Youp |
Aseecobra, When I wheelie the bike I give it a quick blip of throttle (from fully closed to almost WOT) in second gear and it doesn't hesitate then. |
