| Author | Message | ||
     Firemanjim |
OK guys,have a PC5 to try on our 1125 and instructions say to disconnect O2 sensors but really want to leave them in for now. Anyone have a screen shot or a copy of the 1125 map showing where learned fuel is so I can tune around it?Happy to report back with results. | ||
| Ratbuell |
 (waiting for the inevitable "use the Erik Buell Racing computer" posts...this'll be entertaining!) | ||
| Kicka666 |
Get the auto tune module & widebands for the PC5 & set your target AFR's & let it do its bizzo. | ||
| Zac4mac |
Jim - you're no stranger to Buell so I'm curious why you prefer the PC-V over Erik's programmable solution for only 750 total?? Other than the serial interface(really, no USB?????) it's a pretty elegant solution for tuning. No flaming, I know a bit about your abilities and history here... Zack | ||
| Firemanjim |
Cost is an issue with a bunch of folks and Erik Buell Racing set up is more than twice the price of the PC5.And for ease of tuning on a dyno the PCs are great as you can do changes live and see the results instantly. And Kick,the autotune set-up again adds a bunch of cost and as I have not had a chance to see one in action on our dyno I am hesitant to use one until I see them in action. | ||
| Firemanjim |
I have an Erik Buell Racing tune in my 1125--a Jardine map-- and it does run much better than stock,but is too rich up top and I know I can make more power pulling out fuel. | ||
| D_adams |
Hmm. I'm pretty sure my pipes (of the 3 I've seen running on my personal bike) all show rich up to about 6k rpm, but then switch over to a little on the lean side with ebr's race cal. Lean being 13:1 or so, comparing it to 11.5:1 when WOT in the lower rpm range. Either way, it runs like a scalded cat in a big hurry. www.keda-design.com | ||
| Firemanjim |
So,about 3/4 done with the bike--has Erik Buell Racing race pipe and K&N,rear cylinder not bad,front was silly rich in 40,60,80, and 100 percent ranges. Pulled fuel like crazy and smothed out curves to about 13.2-13.4,picked up 6 HP on top. Will finish as soon as I find where the kid hid his race gas as fuel light just came on.147.6 with 90 ft/lbs. | ||
| Hootowl |
Were you able to get the stock map to find the learned area? | ||
| Firemanjim |
Not so far.Going to leave 02 sensors disconnected for now.It is a racebike,but sure would be nice to do one with them. Hey,Dean,as the stock Buells are around 14.1- 14.7 calling 13.1 lean is funny. And 11.5 is richer than what we shoot for on the nitrous bikes,the turbo bikes are just a little richer than that. | ||
| D_adams |
What fuel are you using? 93 octane pump gas or race fuel? I'm using just plain 93 octane pump gas and I monitor it with a PLX Devices wideband setup. When I say 13:1 is lean, that's at WOT above 6k rpm. Below that rpm it was a wee bit richer. At cruise, it's at 14.5:1 or so, but the front/rear balance is off about 1/2 a point. One will be 14.5, the other is at 14 even, so there's still tuning to be done. I'm just waiting on them to finish it, I still have the starting race calibration. I assume it's what Eslick ran in 09, but I don't know for sure. It might be the pump gas version, which I assume would have slightly different timing maps to account for fuel burn at a different octane rating. In stock trim with a stock pipe, I consistently saw 15.5:1 or higher at cruise, never below 13.5:1 at WOT. EPA fueling sucks, it was lean from what I saw. Even though it wasn't the right way to fix it, I added 10% fuel across the board to see what it would do. It helped it a bit, but it certainly wasn't right. I don't know the reasoning for how Erik Buell Racing tunes exactly, but from what I gathered, running it rich like that helped smooth out the engine at lower rpm a lot, as well as making it run a little cooler. They mentioned that it was a little bit too fat on the bottom though. I do know that it was a HUGE improvement over stock, acceleration was fairly consistent or linear for the most part. I saw the dyno map/curve on their dyno with an RT-4 on their bike. It had a spike around 8k rpm I think that made the bike feel a little like a dirt bike coming on the pipe. They also stated that the motor was getting worn out and had been run pretty hard prior to my run. No idea on how many dyno pulls it had on it, but 122-123 hp on the superflow was nice to see. I guess on a fresh motor with some tuning, I might even see 140+ at the wheel on a dynojet dyno. It's not quite up to par with their full system, but for what it is, it ain't bad. | ||
| Firemanjim |
All done,final tally was a gain of nearly 9 HP, running at about 13.2 AFR on 100 octane race gas. Not a Dyno-Jet dyno--it is a Land and Sea with actual torque cell and it made 149.7 at rear wheel. | ||
| Blake |
Whoa! That's impressive! Good job! |
