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[2uece]

With all the talk of exhaust and PC vs Race fueler....has anyone thought abot throwing more air at these 103's..even more than the Stage 1..please fill me in..How much more power could we have by just putting in a 50 or 54mm EFI Manifold.

[BLM777]

Good question 2euce.  I'll be speaking with a race tech friend of mine this week and ask.  I suspect that the HD ECM downloads wouldn't work at all with the change, but tuning with PC or Race Tuner should provide some fun info.  Will post whatever answers I get.

[mfgreen]

With all the talk of exhaust and PC vs Race fueler....has anyone thought abot throwing more air at these 103's..even more than the Stage 1..please fill me in..How much more power could we have by just putting in a 50 or 54mm EFI Manifold.

Not a whole lot until you get the heads flowed and get a larger intake(1.57inch) and larger exhaust valve (1.94inch) first.

[2uece]

What a large, never ending circle.....all I want is to have this 103" running at its full potential...I'm not looking to be the big man on the block; I just want some more seat of the pants acceleration...HELP

[Unbalanced]

2euce,

If your going to do this make sure you have the headwork done first and I would definately recommend the S&S dual throttle body fuel injection system.   I went the way of the zippers and quite honestly no one could ever tune the bike below 3400 rpm worth a damn.   This is with the 251 cam / 204 cam and 211 cam with the 103 engine and the heads worked.    Had some people I know mess with the S&S and if I go down that road again that will be the setup of choice for me.

If your not going to do the heads and put in either the woods or andrews cam or the S&S 585 then there will be no real benefit there for you other than you have more air / gas flow then you will be able to take advantage of.   Quite honestly 52mm is big enough for a 103 the rest is just over kill.   I have done it been there done that and it really wasnt worth the extra grand with SE cam's.

I didnt take it any further because I then bought the 124" from S&S and put it in the ultra 139 hp / 139 torque not bad for no head work.

Best of luck with it.    If you do go this route definately look at the Rivera Pro Clutch as well it was the only one that worked for me with all the power.    I had lots of issues with the Barnett Scorpion and the SE Heavy duty racing Clutch.   Lots of my friends that race have since switched to the Rivera and love em.

-Unbalanced

[Elvis]

Yo Unbalanced,
You seem to know your way around this issue...seems to me that in terms of mods, sometimes the more you mess with it, the more you mess with it.  I am not interested in going high compression on mine as I need it dependable and high comp engines seem to be in the shop alot.  That said, a little more oomph down low would be nice.  It's a bagger after all, not interested in racing, just getting the most out of this engine.  Seems to me putting in a different cam and flowing the heads we have would be the extent of what I would need to do to make the 103 come alive....agree?  If so, what HD cam (like to keep my warranty) would you recommend that has more torque down low but still performs well at freeway speeds or is that not an option?  Currently have the Rinehart duals with 2.5 inch baffles, Race Tuner and Stage I breather.

thanks,

elvis

[Unbalanced]

Elvis,

Unfortunately my lessons were paid for so they didnt come cheap, but none the less very valuable since I was after fast.

If I were going to go and do this all over again.

[mr_magoo]

I hear HD is working on some larger EFI units.

[Unbalanced]

Mr. Magoo they are.   Only I really dont know how much more help they will be based on their lack luster approaches in the past.   A few iterations have even gone back to some of the original designs that harley made in the infancy of their EFI.

Now that S&S has put out a stable and quality working product I think that harley will have to respond with something only who knows exactly when that will be and then even when they do who really wants to be the guy that buys it to test it and find out if it is really worth its salt.   Not I.  

-Unbalanced

[the O`Fender]

With all the talk of exhaust and PC vs Race fueler....has anyone thought abot throwing more air at these 103's..even more than the Stage 1..please fill me in..How much more power could we have by just putting in a 50 or 54mm EFI Manifold.

Despite what others have said here you will get a nice increase in HP by putting on a larger throttle body but that increase will occur in the HIGH RPM range and you will lose low rpm snap you have in your current setup (the best example I can give is, have you ever driven a V8 with a 2 barrell compared to a 4 barrell) so if your looking for top end, "go for it". [smiley=bigok.gif]
In response to unbalanced being an S&S sales rep!!! My nephew is right now going through fits with the S&S VFI system on his SERK (brand new S&S 124", S&S exhaust, S&S map, bike runs like S*#T) he has replaced computer 2 times in less then 30 days and S&S has no answers??? The system has bugs be careful!!!

[kng103]

elvis,
i ported my heads and put in the se-251 cam.
it's like riding a different bike. pulls much better thru the low and mid range rpm's.
cost was minimal and well worth it.
i also changed the valve springs to accomodate the high lift on the cam.

[Unbalanced]

O'fender (hehe) sorry not an S&S rep, just spent lots of money with them.   I have had just the opposite experience with them though.   Not sure who your nephew is dealing with but if he is really unhappy send me a PM and would be happy to share with you some names of contacts that might help get the ball rolling for your nephew.

I watched the install / mapping and raced a buddy with this on his bike and his 116 bottom end ran good.  Produced 142 hp and 135 torque.   All I can say is I have had the opposite experience in dealing with S&S.

happy to help if I can

-Unbalanced

[Elvis]

Elvis,

Unfortunately my lessons were paid for so they didnt come cheap, but none the less very valuable since I was after fast.

If I were going to go and do this all over again.

[Elvis]

elvis,
i ported my heads and put in the se-251 cam.
it's like riding a different bike. pulls much better thru the low and mid range rpm's.
cost was minimal and well worth it.
i also changed the valve springs to accomodate the high lift on the cam.

Yo King,
How does the 251 perform on the highway?  What rpms are you running at 70mph?

thanks,

elvis

[MAS]

If I were going to go and do this all over again.