Thanks for posting this. Really looking forward to what you come up with as you explore this further.
The LM1's are set up with probes that go in about 20". Not as accurate as sensors according to some but it allows us to test any exhaust system. We think the failure was in the sensor that is in the one of the probes, possibly both!Good stuff Don, really pleased to see some more R&D going on. Be interested to know what happened with your sensors. I'm using the 5 wire Bosch sensors with the LM1s. How were you taking the readings with the undrilled mufflers? Did you use the existing sensor bosses, or drill the headers and put in another bushing? Did the calibrate function on the LMs not work, or was it a sensor malfunction?
What correction factor are you using? SAE, STD, or DJ ? What gear are you using for your testing?
Sorry for all the questions, but I'm out on a bit of a limb over here and you're the only one I know using a similar setup to me. I'll be starting my XR R&D testing soon and it would make sense for the benefit of others, for me to present things in the same way as you. There's likely going to be some differences anyway, but if I use 4th gear and SAE and you use 5th gear and DJ, or vice versa, the differences will be substantial on the numbers even though the percentage gains or losses will be the same. What do you think? I'll go with what you've already started with and then we've got a "standard".
Boz,Yup, same as that. I had some weird AFR readings at the upper end of the RPMs this week. Ran the Direct link data log file back and turned out I'd maxed out the injectors.
I actaully started a pull with no mufflers just for kicks and it fell on it's face so I aborted the runYou should try a run with no mufflers and see what you get.
Hey Phaedrus, no, not my XR, I'm still gathering a few more parts while I wait to make a time slot.Boz,
Did you max out the injectors on an XR, or on another bike? I only ask, because mine are running in 80% range delivering 12.5 at WOT.
If I understand everything that I just read correctly (which does not happen often). A stock XR1200 with a fueler and drilled mufflers will make more torque and horsepower then a stock XR1200 with a fueler and no drilled mufflers through out the entire rev range from 2000 to 6800 rpm ?I did some Dyno Testing of stock mufflers vs. drilled with and without a Fueler. I'm at home right now so I don't have the Dyno Charts to actually post, but here's some numbers to contemplate;All Stock 82.1 HP, 70.7 TQDrilled Mufflers 84.4 HP, 71.5 TQ Interestingly there is a LOSS of torque between 3050 rpm and 3600 with the drilled mufflers and stock Fuel curve. the sound is very Triumph or Norton like with the 3/4" holes, I like it.We ran the stock mufflers with our Top Fueler, this is actually made for us by Dobeck Performance (the guy who invented & owned Dynojet). The peak torque didn't change and the peak HP went up .7 More importantly the torque from 2500 to 3250 went up a little as did HP from 5500 on up by a couple. Much smoother from 2500-3500 rpm.Drilled Mufflers with the Fueler. The Peak HP was the same as without the Fueler at 84.4, peak TQ was 72.1. The important thing here is Torque at 2500 was up 4-5 Ft lbs and it basically gained 2-4 all the way through the power band. The same was true for the HP.
Yes, but very minor differences.If I understand everything that I just read correctly (which does not happen often). A stock XR1200 with a fueler and drilled mufflers will make more torque and horsepower then a stock XR1200 with a fueler and no drilled mufflers through out the entire rev range from 2000 to 6800 rpm ?
The set up that comes pre programmed in the Top Fueler was pretty much dead on for So Cal with drilled mufflers. (And it was the same setup for the non drilled mufflers as well)This is awesome, Street. Would you be willing to post your best settings for your Top Fueler for those of us running that setup? :whistling:
I did some Dyno Testing of stock mufflers vs. drilled with and without a Fueler.
As soon as I can get it back on the Dyno I will tune it for 12.5-13.3 across the board and see what we get, we are expecting, based on experience, to see another 3-5 HP and Ft Lbs across the board.