Dyno time

[cjmech]

Put the beast on the dyno for a baseline run last thursday. I wanted to see where the AFR's were since installing the big bore kit. Dyno sheet shows 91whp and 78 lb-ft with the AFR's in the 14 range thru the entire run. Its scheduled to go in for a tune on the 2nd but the tuner has worked a few buells and says itll make 100 easily. Once its tuned I will post up the maps for "Refrence".

I have seen a few guys on here that say they have maxed out there injectors with bolt ons so we shall see if its enough injector with the new FPR.

Current Mods:
Big bore kit (1250) w/ 10.5:1 pistons, Race ECM, Drummer exhaust, Energy 1 clutch, delphi FPR swap, k&n and the breather mod.

https://youtu.be/c2LF6ljbgEY

Thoughts?

 

[fireinxb]

Love it. Can't wait to see what she does after a proper tune!

 

[Chicknstripn]

Who and where is the tuner that actually knows what they're doing with a Buell? That's valuable info in this community!

 

[cjmech]

Who and where is the tuner that actually knows what they're doing with a Buell? That's valuable info in this community!

This is still to be determined lol. Once I see the final result I shall share this info.

 

[Chicknstripn]

Gotcha!
Either way it goes... .....share when you're ready.

 

[lawdog]

With my big bore kit and increased psi fpr I am running around 9% more fueling and still a little lean up top and rich in the high tps/ mid rpm region. I am still in the break in period so not going too crazy and have only datalogged the front cylinder so far. With yours I would imagine you will see some nice gains with increased fueling at WOT. I was surprised at how lean mine was even with 9% more fueling (at higher psi)!

 

[theMelvster6]

Bigger Injectors the main difference is the spray angle. The buell injectors are front/rear cylinder specific as the spray angle is directed straight down the intake runners of the TB. These bigger injectors are straight spray, but they will work. I think Eric Z runs them on his turbo buell. You can get 42 lb/hr, 60 lb/hr, or 80 lb/hr at the specified 3 bar (43.5 psi). The stock buell injectors are somewhere around 30 lb/hr at 49 psi (which is stock buell fuel pressure). The biggest problem you have with higher fuel pressure and bigger injectors is you start having issues with flow rates at idle on low throttle. The injectors have a hard time reacting fast enough to not over fuel. But at the top end you are fine. Or like lawdog said, rich on the bottom and lean up top. If you look at an xb 12 fuel map, from the get go some of those upper throttle positions are already in the 230 range on the bit data. Now 255 being the max, it won't go any higher. In the bit data 255 is 100%. That's why ebr put out the higher pressure regulator. Now it's a 450 kpa fpr. That is 65 psi!!! Now you have to factor in duty cycle and what the injector can handle. I think you are better off going with a bigger injector if you need more fuel and leave the stock fpr in there. HOWEVER, any adjust mental to fuel pressure or injector flow rate requires an entire remap. Reason being, those values in the fuel maps represent pulsewidth and how long the injectors are staying open. With more fuel being put in, you won't need as much pulse with. Your xb12 fuel map will stat looking more like a xb9 fuel map which generally is 9-10% less.

 

[lawdog]

Spot on advice! My fuel map even with bolt ons maxed out my stock injectors and my mapping was completely different. I haven't done too much datalogging and tuning with the wideband yet (since the big bore kit) as I am still doing my break in and haven't had much time to ride. I will be gone for several weeks for work too. Ugghhh

I think you will be ok with your setup. You may be close to 100% at WOT/max rpm but from looking at my datalogs I know I haven't maxed out yet and it doesn't look like I will. It will be close. Once I get the kit broke in more I can do some more red line runs and see.

 

[s0dhi]

The biggest problem you have with higher fuel pressure and bigger injectors is you start having issues with flow rates at idle on low throttle. The injectors have a hard time reacting fast enough to not over fuel. But at the top end you are fine.

This is often why it also makes sense to run multiple injectors per cylinder. I believe the 1190RX runs standoff injectors, as do many high performance/race ITB or turbo automotive applications.

 

[theMelvster6]

Also...I was looking some where that you can use an fpr from a mid 90's dodge caravan. I think it's specified pressure is 400kpa which is about 58psi which will give you about a 32 lb/hr. So slightly more fuel flow rate.

 

[cjmech]

Well the dyno session went well and the bike runs great. Didnt make 100 as the tuner believed it would but thats because I ran out of injector....

The tuner took his time and really got the map nice with the adaptive fueling turned off. He got it to stay in the 97-104 range but at WOT shes maxed out by 3500 and AFR levels off at 14:1.

I rode it home and promptly plugged in to make note of the tables. The Adaptive fueling really messes with things from what I have read so I wanted to make sure I had a base refrence saved just in case.

Need reccomendations on injector upgrade options.

Bike made 95whp and 82lb-ft btw...
Working on posting the new vid today.

 

[GregoXB]

You got a lot of decel popping. A good tune should help iron that out.

 

[cjmech]

Here is the vid loaded up.

https://youtu.be/Nw1Wotyfveo

 

[theMelvster6]

Yeah...you want those afrs at like 13.0-13.4 for max power in the WOT range, and of course a smooth transition from the closed loop region at 14.7:1 AFR. For such a mild build I'm surprised you actually maxed out to be honest. If you look at my earlier post. There is a link to injectors that are compatible.

 

[theMelvster6]

another thing...if you have your tune dialed in, your adaptive fuel doesn't mess with things, it actually does what its meant to do. The problem is, for example, the closed loop might be tuned rich so when it makes corrections it pulls fuel out of your open loop, right where you want to keep the fuel in it.