which cams would you reccomend

[strokerjlk]

Do you have experience with the fat cat and quiet baffle for the 2012 bikes being a hold up at 113 hp?

I don't like any of the boss cat tunes I have done. They always fall short on hp.
I think Jamie is on the right track.

[RevFastEddy]

With a graph like that to get 5# more TQ for 500 more RPMs it will probably cost $500 to $1000.... and then your wallet will feel it a lot more than your butt will.  JMHO

[sfmichael]

Lots of good advice here. Must run pretty damn good. If you really feel the need to spend some cash I'd vote throttle body before cam but for real world riding this thing should be pretty good as is.

[BUBBIE]

Lots of good advice here. Must run pretty damn good. If you really feel the need to spend some cash I'd vote throttle body before cam but for real world riding this thing should be pretty good as is.

sfmichael,

Just got off the phone with Mark Dobeck per our PM's today (your and mine)... Mark Dobeck also shared a new product that he is building... A third injector system that puts fuel into the air box so you can run on the same old throttle bodies but have the added Fuel (20%) when needed in a BIG motor, YET keeping the mileage up using the original  HD injector equipment. Think it works with his Gen 4 AFR set up.

Ask him about this when you talk... I didn't know How big you are going but thinking your more like My 103 build, cams and compression boost on your 2010 King...

signed....BUBBIE

[TorQuePimp]

  Will it quit working in the middle of a long ride and burn up a engine like the old one did ?

[akjeff]

Lots of good advice here. Must run pretty damn good. If you really feel the need to spend some cash I'd vote throttle body before cam but for real world riding this thing should be pretty good as is.

sfmichael,

Just got off the phone with Mark Dobeck per our PM's today (your and mine)... Mark Dobeck also shared a new product that he is building... A third injector system that puts fuel into the air box so you can run on the same old throttle bodies but have the added Fuel (20%) when needed in a BIG motor, YET keeping the mileage up using the original  HD injector equipment. Think it works with his Gen 4 AFR set up.

Ask him about this when you talk... I didn't know How big you are going but thinking your more like My 103 build, cams and compression boost on your 2010 King...

signed....BUBBIE

That kinda sounds like a solution in search of a problem? Wouldn't simply adding bigger injectors accomplish the same thing, with less gadgetry? Still won't change the fact ,that larger motors need larger volumes of air to reach their potential. All you'll wind up with, is a big inch motor, that doesn't make the power it could.....but gets really good gas mileage! 

Jeff

[sfmichael]

Lots of good advice here. Must run pretty damn good. If you really feel the need to spend some cash I'd vote throttle body before cam but for real world riding this thing should be pretty good as is.

sfmichael,

Just got off the phone with Mark Dobeck per our PM's today (your and mine)... Mark Dobeck also shared a new product that he is building... A third injector system that puts fuel into the air box so you can run on the same old throttle bodies but have the added Fuel (20%) when needed in a BIG motor, YET keeping the mileage up using the original  HD injector equipment. Think it works with his Gen 4 AFR set up.

Ask him about this when you talk... I didn't know How big you are going but thinking your more like My 103 build, cams and compression boost on your 2010 King...

signed....BUBBIE

thanks Bubbie   

[Admiral Akbar]

Why do you need more fuel when you can't get any more air?   

Max

[Mopar]

I like Andrews cams. Another thing to consider also is a 30 tooth tranny gear same as Tri-Glide. With the six speed it works great,

[BUBBIE]

Why do you need more fuel when you can't get any more air?   

Max

I don't know Max.

I Posted the above Post intending it to be a PM to sfmichael...
You must know how it gets as we age... OR do you? .. Of course not... You are TimeLess

I'll ask Mark Dobeck on my next phone conversation with him... I'm not sure IF he wanted that out YET but There It Is...

He is a pretty sharp guy and has come up with a few useful things over the years.

As for IF a product he makes,,,,,,, "Will it quit working in the middle of a long ride and burn up a engine like the old one did ?" I think anything IS possible with ANY product.... I Once bought a new bike with a bad oil problem,,, "0" pressure at start-up on occasion.,,,,,Came from HD that way.... So,,,

signed....BUBBIE

[drhooligan]

It seems as if these 107s with good heads like a larger throttle body. I'm wonder if the stock injectors are good here or do you need to go to something like a 5.3 gm/sec unit?

[Ohio HD]

Injector size is more a requirement of HP than head or TB flow. If the motor can be tuned to MAX HP without over utilizing the injectors, no need to go larger.

4.3 injectors are good for around 110 HP +/- a few HP.

[Barrett]

I added 4.9's on my little 96" for the nitrous and it was a noticeable improvement in the midrange and upper R's.. It didn't hurt anything in the bottom either..

[HD/Wrench]

4.3 stock injector will go well into the 120 Plus HP range. My 09 had stock injectors and made 120/120 +  Now it may show that its being over driven when its on the dyno but it unless you loose control its still working. The issue is a old one on use of larger injectors. In a nutshell how long can you over drive one before it fails. You are talking milaseconds when tuning.  Before you could get larger units I ran my old 124 at 65 PSI fuel pressure and it made almost 150 Hp . Ran it for years without a issue.

With the stage 4 head and the pipe you have your numbers are not really off per say.   That cam is not huge by any means. Look at my old testing with the 107 the 113 mark was hard for me to get beyond with the smaller cams. Tq was in the 120 range but until I went to the  Crane 296 was frustrating.  That 296 will do what you want and it will still make great tq is not a loud cam noise wise.  I know you can find the odd sheet with a cam that shows huge power but I would say show me several sheets that all make big power.

I feel that  really you are well within a range of normal out put from that current set up.  Larger t/b is going to be needed if you want more HP. Really I would leave the build along myself. Great tq curve for everyday use

[Ohio HD]

Steve, my comments were not meant as an absolute, that's why I stated +/- HP in my comment. I realize there are variables that dictate when you need to increase injector size. Below is a sample of when I had my 107 on the dyno last year. I was hitting over 100% injector utilization in 5th gear at 6,300 RPM. I was also able to reproduce this on the street in 4th gear when running over 6,300 RPM, the motor would drop out from fuel loss, the rev limiter was set at 6,800 RPM. In 1st, 2nd and 3rd gears this didn't happen, only in the 4th and higher gears would the load at that RPM require the fuel demand. You can see the injector demand on the 2nd image at 6,100 RPM as 96.7%. I was able to repeat this all day if I wanted.

My motor was not making near 120 HP, but I was using all of the injector under the right conditions, I was at 106 HP SAE. I set the rev limiter to 6,000 RPM, solved my problem, as the motor was flat after 6,000 RPM anyway due to stock size valves and what the heads would flow.

6,300 RPM
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6,100 RPM
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[HD/Wrench]

Not taking it that way , all good with the info you posted , Just that some want to read a post and think that it is written in stone. I just completed several 110 engines and made 121 HP on stock injectors.. SO other things come into play as we both know.


What size did you set injector to on that cam timing in the tune ? I have to wonder how the program works once you alter that and what is being show how "real"it really is. So if you set the size to say 3.9 does that Drive rate reduce? never bothered to try that to see how it would be effected.  If you loose control of the injector then yes you are done. 

Off topic some but I re-tuned that 124 without PV and was able to set CI to 126 (124 would have been fine I was not wanting to come up short in the mid range)  and leave the 6.2 as 6.2  ,....now with the PV I was at 147 CI and had the size down in the 3.9 range .( and almost out of room in the VE tables) . SO how do these figures really spec out?? All I did was swap tuners and results are no where near the same from one to the next   Not looking for an answer really , as it only turns into a he said she said,     But that is my observation.   Even still I

[Ohio HD]

I had left the injectors at 4.35 in the program, I didn't see the need to change it, and don't know enough about it to determine any changes to this.

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[timtoolman]

woods 400-6 is a major torq  cam or as Scott said the 408

[sfmichael]

woods 400-6 is a major torq  cam or as Scott said the 408

this thread's almost a year old...recently resurrected to discuss injector size   

never did hear back from OP (harleyp) as to what he decided to do, if anything...

[timtoolman]

oops  sorry  i didnt see how old it was

[Ohio HD]

woods 400-6 is a major torq  cam or as Scott said the 408

this thread's almost a year old...recently resurrected to discuss injector size   

Well, post something new and we'll talk about it....   

[sfmichael]

how bout them Broncos???

   

how's that new motor treatin' ya??   

    I'll put a beer since we don't have a guy slobberin' icon...bet that thing is fun 

[Ohio HD]

how bout them Broncos???

   

how's that new motor treatin' ya??   

    I'll put a beer since we don't have a guy slobberin' icon...bet that thing is fun

ohh I guess they're OK, I'm more a Chevy guy...     

Motor is running fine, have just over 5,000 miles on it since the first week of August. Not bad for a guy who works out of town, I do keep the roads hot.   

[harleyp]

sorry for slow response
put in t man 590 se 58 tb 5.3 injectors
gained 1 hp lost some tq
but I used a different tuner

[Hossamania]

How does it feel compared to your old set-up?