Harley Davidson Forums

hogrotten · Jul 27th, 2012, 09:37 PM

Just wondering what kind of of gains I could expect if I was to go with a larger manifold,and injectors and send my heads in for cnc porting? I'm running a 106" motor with 583 S&S cams and I'm currently at 90hp and 110torque.

90FXRS · Jul 27th, 2012, 09:50 PM

Depending on what you do I wouldn't think the torque would increase as much as the horse. I would suggest talking to whoever is going to do the heads and discuss with them what your riding style and needs are. What kind of exhaust are you running?

Midnight Reign · Jul 27th, 2012, 11:05 PM

I'm not sure how you woud quantify the gains but I'd bet money you would really feel it in throttle respose and in the seat of your pants

Hoople · Jul 28th, 2012, 09:09 AM

All depends on what you also do to the fuel and ignition mapping. That can be one time consuming project, especially the spark advance curves. Where did you get the ignition maps for your current 583's.

hogrotten · Jul 28th, 2012, 12:55 PM

Quote: Originally Posted by Hoople View Post

All depends on what you also do to the fuel and ignition mapping. That can be one time consuming project, especially the spark advance curves. Where did you get the ignition maps for your current 583's.

Had it tuned at Trask Performance here in Phoenix, and quite honestly not that happy with it. They did go in and adjust the VE tables but they left the tuning constants at 110" and it appears they only changed the advance curve where pre ignition was a concern.

hogrotten · Jul 28th, 2012, 12:57 PM

Quote: Originally Posted by 90FXRS View Post

Depending on what you do I wouldn't think the torque would increase as much as the horse. I would suggest talking to whoever is going to do the heads and discuss with them what your riding style and needs are. What kind of exhaust are you running?

I'm running Hooker longs.

90FXRS · Jul 29th, 2012, 12:54 AM

Quote: Originally Posted by hogrotten View Post

I'm running Hooker longs.

Is there a cross-over in those?

hogrotten · Jul 29th, 2012, 12:59 AM

Quote: Originally Posted by 90FXRS View Post

Is there a cross-over in those?

No Sir.

Lowrider85 · Jul 29th, 2012, 02:40 PM

If done properly, porting and flowing your heads and increaseing your compression by decking your hrades slightly should give you greater HP gains to the point that they exceed the inches of your motor, i.e., 106" > 106 hp.... As far your exhaust is concerened, besides 2 into 1 exhausts, the Hooker Step Tuned exhaust seems to give a very good result in HP and torque gains. I have the Hookers on my 119", I dyno at 140hp with 143tq.

Good Luck, hope you get what you are looking for...

hogrotten · Jul 29th, 2012, 07:53 PM

Quote: Originally Posted by Lowrider85 View Post

If done properly, porting and flowing your heads and increaseing your compression by decking your hrades slightly should give you greater HP gains to the point that they exceed the inches of your motor, i.e., 106" > 106 hp.... As far your exhaust is concerened, besides 2 into 1 exhausts, the Hooker Step Tuned exhaust seems to give a very good result in HP and torque gains. I have the Hookers on my 119", I dyno at 140hp with 143tq.

Good Luck, hope you get what you are looking for...

Thanx, I was just looking at the Big Boyz web site and think I'll give them a go for the porting. As for the decking will they know how much can be shaved if I give them a list of the mods so far or will that have to be determined by other meens?

Jul 27th, 2012, 09:50 PM	#2
90FXRS Contributor$ Ride: 2001 FLSTFI Join Date: Jun 17th, 2010 Location: Southern Indiana Posts: 365 My Mood:	Re: Power gains Depending on what you do I wouldn't think the torque would increase as much as the horse. I would suggest talking to whoever is going to do the heads and discuss with them what your riding style and needs are. What kind of exhaust are you running? __________________ *There's NO Substitute For Cubic Inches!!!*

Jul 27th, 2012, 11:05 PM	#3
Midnight Reign Play The Throttle Ride: 2012 flhx Join Date: Nov 21st, 2011 Location: Bear Delaware Posts: 152 My Mood:	Re: Power gains I'm not sure how you woud quantify the gains but I'd bet money you would really feel it in throttle respose and in the seat of your pants

Jul 28th, 2012, 09:09 AM	#4
Hoople Contributor$ Ride: 2009 Dyna Low Join Date: Aug 16th, 2009 Posts: 7,001	Re: Power gains All depends on what you also do to the fuel and ignition mapping. That can be one time consuming project, especially the spark advance curves. Where did you get the ignition maps for your current 583's. __________________ When all else fails, hit the turbo entabulator button. http://www.youtube.com/watch?v=rLDgQg6bq7o

Jul 28th, 2012, 12:55 PM	#5
hogrotten Community Star Ride: 08 FLHX S&S 106" w583 cams Join Date: Jul 31st, 2008 Location: Arizona City, Arizona Posts: 630 My Mood:	Re: Power gains Quote: Originally Posted by Hoople View Post All depends on what you also do to the fuel and ignition mapping. That can be one time consuming project, especially the spark advance curves. Where did you get the ignition maps for your current 583's. Had it tuned at Trask Performance here in Phoenix, and quite honestly not that happy with it. They did go in and adjust the VE tables but they left the tuning constants at 110" and it appears they only changed the advance curve where pre ignition was a concern.

Jul 28th, 2012, 12:57 PM	#6
hogrotten Community Star Ride: 08 FLHX S&S 106" w583 cams Join Date: Jul 31st, 2008 Location: Arizona City, Arizona Posts: 630 My Mood:	Re: Power gains Quote: Originally Posted by 90FXRS View Post Depending on what you do I wouldn't think the torque would increase as much as the horse. I would suggest talking to whoever is going to do the heads and discuss with them what your riding style and needs are. What kind of exhaust are you running? I'm running Hooker longs.

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Jul 29th, 2012, 12:54 AM	#7
90FXRS Contributor$ Ride: 2001 FLSTFI Join Date: Jun 17th, 2010 Location: Southern Indiana Posts: 365 My Mood:	Quote: Originally Posted by hogrotten View Post I'm running Hooker longs. Is there a cross-over in those?

Jul 29th, 2012, 12:59 AM	#8
hogrotten Community Star Ride: 08 FLHX S&S 106" w583 cams Join Date: Jul 31st, 2008 Location: Arizona City, Arizona Posts: 630 My Mood:	Re: Power gains Quote: Originally Posted by 90FXRS View Post Is there a cross-over in those? No Sir.

Jul 29th, 2012, 02:40 PM	#9
Lowrider85 Start The Engine Ride: 2005 Road King Join Date: Jul 22nd, 2012 Location: CT Posts: 46 My Mood:	Re: Power gains If done properly, porting and flowing your heads and increaseing your compression by decking your hrades slightly should give you greater HP gains to the point that they exceed the inches of your motor, i.e., 106" > 106 hp.... As far your exhaust is concerened, besides 2 into 1 exhausts, the Hooker Step Tuned exhaust seems to give a very good result in HP and torque gains. I have the Hookers on my 119", I dyno at 140hp with 143tq. Good Luck, hope you get what you are looking for...

Jul 29th, 2012, 07:53 PM	#10
hogrotten Community Star Ride: 08 FLHX S&S 106" w583 cams Join Date: Jul 31st, 2008 Location: Arizona City, Arizona Posts: 630 My Mood:	Re: Power gains Quote: Originally Posted by Lowrider85 View Post If done properly, porting and flowing your heads and increaseing your compression by decking your hrades slightly should give you greater HP gains to the point that they exceed the inches of your motor, i.e., 106" > 106 hp.... As far your exhaust is concerened, besides 2 into 1 exhausts, the Hooker Step Tuned exhaust seems to give a very good result in HP and torque gains. I have the Hookers on my 119", I dyno at 140hp with 143tq. Good Luck, hope you get what you are looking for... Thanx, I was just looking at the Big Boyz web site and think I'll give them a go for the porting. As for the decking will they know how much can be shaved if I give them a list of the mods so far or will that have to be determined by other meens?

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