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Old May 15, 2012 | 07:03 AM
  #11  
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Originally Posted by darthsportster
Hi All,

I have an '11 sporty Iron 883 I did the NRHS 1250 KIT, andrews cams, power commander, Roland sands heavy breather, ported heads, v & H short shot exhaust etc...... Now, I'm seeking more power, I was thinking S/C or T/C but not yet sure which route to go, and if they even have a kit for a 1250CC stroker? I'm just thinking of how many rice burners I'd leave in the dust if I 'charged it
My first reaction... If you want power, buy a Busa or ZX-14. Why you need that much power for the street is another question. So is expecting to compete with the rice bikes.

I guess I can see this pursuit to satisfy the tinker's passions or whatever. However, I sort of cringe when the goal is so you can leave crotch rockets "in the dust." Good luck with that. On public roads? Better to spend the money on a cheap SV-650 or 600 sport bike and set it up for track days. Better environment and opportunity to take your skills to the next level.

Am I getting old?
 

Last edited by T^2; May 15, 2012 at 07:08 AM.
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Old May 15, 2012 | 07:33 AM
  #12  
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It's not a Sportster but it's a fast bike. 1987 Z1 1140cc. It's done mid 9's 1/4 mile.
 
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Old May 15, 2012 | 11:34 AM
  #13  
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There are a few kits out there for super and turbo charging. I'm partial to super charging because of the reliability compaired to turbo(boost spike) but just do alot of research then make your pick, you'll have to get a custom tune so there's some money in Dyno time right there.
 
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Old May 15, 2012 | 12:06 PM
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Originally Posted by JonFMJ
There are a few kits out there for super and turbo charging. I'm partial to super charging because of the reliability compaired to turbo(boost spike) but just do alot of research then make your pick, you'll have to get a custom tune so there's some money in Dyno time right there.
If you properly size and trim your turbo for your engine and power goals along with setting up the wastegate/BOV properly, boost spike really should not be problem at all.

Also, turbos will get your more net power all day long vs. a supercharger, but you're giving up some powerband for that high end oopmh.
 
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Old May 15, 2012 | 02:04 PM
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I would think that if your willing to turbo the bike it would be better for a HD to supper charge it. Maybe throw on a holly 650-4, headers, 12.5 to 1 pistons race cams & 50's on the rear. Gee, sounds like my old Corvair! PS: it wasent a bike but it ran like one!
 
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Old May 15, 2012 | 09:39 PM
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Just like scuba said, having the proper set up can eliminate the problem of boost spike. But finding somebody familiar with turbo tuning could be a problem. Tuning NA is one thing but when you start with forced induction your parameters of "safe running" can close very sharply depending on the flow rate, psi and the compression ratio your running. Everytime I've built or helped build an engine for a car we map the whole thing out on paper. Every stinking nut bolt and gasket. Its tediouse but will save your wallet at the end
 
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Old May 15, 2012 | 10:02 PM
  #17  
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Originally Posted by T^2
My first reaction... If you want power, buy a Busa or ZX-14. Why you need that much power for the street is another question. So is expecting to compete with the rice bikes.

I guess I can see this pursuit to satisfy the tinker's passions or whatever. However, I sort of cringe when the goal is so you can leave crotch rockets "in the dust." Good luck with that. On public roads? Better to spend the money on a cheap SV-650 or 600 sport bike and set it up for track days. Better environment and opportunity to take your skills to the next level.

Am I getting old?
Some people just don't get it. The objective is to go fast without buying Jap Crap. (Anyone can go buy a 'Busa) Ever see the look on a guys face riding a crotch rocket when he get's smoked by an HD? It doesn't happen often but it can happen. It only takes money. See that video above of the turbo Sportster? 182 HP! That will leave all but the fastest crotch rockets in the dust in the quarter mile. There is a guy at our local track who runs high 9's on a streetable Sporty.
 
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Old May 15, 2012 | 10:03 PM
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Originally Posted by DavidStiebel
I would think that if your willing to turbo the bike it would be better for a HD to supper charge it. Maybe throw on a holly 650-4, headers, 12.5 to 1 pistons race cams & 50's on the rear. Gee, sounds like my old Corvair! PS: it wasent a bike but it ran like one!
I wouldn't recommend 12.5:1 if you're gonna supercharge it.
 
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Old May 15, 2012 | 10:56 PM
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Originally Posted by JonFMJ
But finding somebody familiar with turbo tuning could be a problem. Tuning NA is one thing but when you start with forced induction your parameters of "safe running" can close very sharply depending on the flow rate, psi and the compression ratio your running.
That is by and far the hardest part of doing a turbo build. Anyone can slap parts together and run lines, but getting that thing to really work is why those tuners make the big bucks.

Originally Posted by dgdamore
I wouldn't recommend 12.5:1 if you're gonna supercharge it.
Yeah, neither would I. Forced Induction builds in cars I'm familiar with are usually running 8:1 or 9:1 CRs, and that's running up to about 15psi. You're gonna blow that engine in no time charging it with a CR like that, if you could even tune the knock out of it.
 
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Old May 15, 2012 | 11:36 PM
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Wow 182 HP thats insane out of a little sporty!!! Also reliability must be compromised a tad bit if you're constantly running on boost, BUT the upside is, nobody is going to see it coming a Turbo'd Sporty blowing by them how sick is that 182 is just Bonkers! But its good power! I'm debating whether or not to charge it or leave it cause reliability is a big factor too.
 
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