Help needed- Noticed in my data logs that my injector duty cycle is well exceeding 80% and in some cases over 100%. I have the stock 46mm TB and would either like to swap for 4.9 or 5.3 injectors, or just do the SE 50mm kit (4.9 injectors, manifold, TB, IAC). I don't need the 58mm TB for my build.

But- I'm mot sure which part numbers will fit the cable throttle 2012 103b motor w/ 46mm TB- Stock heads btw.

4.9 injectors P/N= ?
5.3 injectors P/N = ?
50mm SE TB kit = will this one work? http://www.kutterharleyonline.com/ha...body-27623-05a

 

wow - no one. guess the experienced folks have left the forum. whatever I find out on this I'll post it up.

 

That SE50mm will work, just had one delivered Saturday.

 

Thanks brother- Did the plenum end of the kit fit your stock heads? The SE TB kit has 1.750 intake runners and the stock 103 heads have 1.6 intake ports.

 

I haven't installed it yet ( going to go 107" ), the big name engine builders all recommended I install it that the stock 46mm would be to small. They said it will fit right on stock heads.

 

yep that is correct- the 46mm and 3.91 injectors are only good up to 80-90hp. Who is doing your heads and cylinders? More than likely they will match up the SE 50mm intake runner ports to your heads. from what I've been able to find out I don't think it would fit right on to stock HD heads.

 

Not 100% sure who I will have do the heads, either Fuel Moto or Hillside.

 

it will fit right on to the heads but with the bigger opening of 1.750 on the intake and the smaller port size on the heads will cause reversion and create driveabilty issues. the heads need to be port matched. also my stock 46mm with the 3.9 injectors supported 102 hp. ran the stock TB until I could afford the 51mm hpi on my first build. and the 4.9 injectors will support up to 130 hp which I am running on the new build. just install a set of andrews 57's and some stage 2 hillside heads and a SE pro 50mm tb on a friends 14 breakout and he is very happy with the end results.

 

Thanks bud that is what I was thinking - if it fit there would be a pretty bad port mismatch- What static comp did you set the motor at for the 57? was thinking that one or the TW777, or the TMan 625 (which I have used before on an Evo, it's a stump-pulling cam from 2k up w / 10.5:1). I may have to clearance the engine case for the 625 lobes though. -BTW nice FXD!

 

heads were set for 10.1 u can check out the thread i posted in the softtail section its called breakout stage II heads update. the bike in first gear just rolling along and u wack the throttle wide open that 240 rear tire really comes loose I was very surprised