Woods TW7H w/ +4 gear
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Joined: Dec 2008
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From: Cumming, GA
Woods TW7H w/ +4 gear
I have an 07 Streetglide that was built to a 103 when the crank took a crap last year. I'm running a TW7H cam, with 10.2 Comp/ with releases, mild head work with 1 size up valves and lower end that has been welded, trued, balanced, timkened, etc. It runs very nice with a Fuelmoto map in a PC5. I've changed to a 30 tooth trans sprocket and will do the 68 tooth wheel sprocket to keep rpm up, this winter.
My only issue is that the power doesn't really kick in until I cross 3000 rpm. I'm an old guy and ride mostly between 2500 and 3200, with an occasional twist to 4000. Is there any way to bring that power curve to 27-2800 rpm? It's a little disappointing to have all the power just out of my normal riding range. I've read about adding a +4 cam gear, but wonder what the trade offs are. Can dyno tuning alone move the power to the left?
As I see it, I have 3 options:
1) Have it dynoed by someone like Jamie or Doc and then shut up and ride the damn thing.
2) Add + 4 cam gear and then do #1.
3) Change cams to something that comes on a little earlier and then do #1. (I've read threads, cam specs and comparison charts and tried to understand, and it may as well be advanced Calculus)
Comments and suggestions would be appreciated.
Don
My only issue is that the power doesn't really kick in until I cross 3000 rpm. I'm an old guy and ride mostly between 2500 and 3200, with an occasional twist to 4000. Is there any way to bring that power curve to 27-2800 rpm? It's a little disappointing to have all the power just out of my normal riding range. I've read about adding a +4 cam gear, but wonder what the trade offs are. Can dyno tuning alone move the power to the left?
As I see it, I have 3 options:
1) Have it dynoed by someone like Jamie or Doc and then shut up and ride the damn thing.
2) Add + 4 cam gear and then do #1.
3) Change cams to something that comes on a little earlier and then do #1. (I've read threads, cam specs and comparison charts and tried to understand, and it may as well be advanced Calculus)
Comments and suggestions would be appreciated.
Don
Last edited by pworks; Nov 6, 2011 at 09:20 AM.
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Joined: Aug 2011
Posts: 254
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From: Texas
I would go with the first option! That is about the same place (2800-4500 rpm) where the high flat spot of my torque curve resides. Although I did get quite a bit of torque increase in the lower rpm range, the majority resides where you describe.
That is where I want it for passing, entering a ramp, etc. I am running a stock 103 with stage II using S&S 510 cams. It was tuned and dyno'ed by one of the best. It starts easily, idles good (more old school), very rideable, and the power is there when I need it. So far, very pleased with the build.
That is where I want it for passing, entering a ramp, etc. I am running a stock 103 with stage II using S&S 510 cams. It was tuned and dyno'ed by one of the best. It starts easily, idles good (more old school), very rideable, and the power is there when I need it. So far, very pleased with the build.
Last edited by Woollymonster; Nov 6, 2011 at 09:30 AM.
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From: Western South Dakota
#3. Feuling 574 cams;
http://www.directharleyparts.com/eng...yna-p-375.html
574 Cams - Wicked power band for modified engines. This is a great all around camshaft with solid low end performance and mind blowing mid and top end power. Works best with modified cylinder heads, increased compression ratio, performance exhaust and intake systems. Performance valve springs, pushrods and lifters required. RPM 2,250 - 6,800
http://www.directharleyparts.com/eng...yna-p-375.html
574 Cams - Wicked power band for modified engines. This is a great all around camshaft with solid low end performance and mind blowing mid and top end power. Works best with modified cylinder heads, increased compression ratio, performance exhaust and intake systems. Performance valve springs, pushrods and lifters required. RPM 2,250 - 6,800
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Joined: Dec 2008
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From: Cumming, GA
I think the 255's are out because of the compression. I do have an ebay set of 255's I was going to install before the crank crapped out.
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Joined: Oct 2007
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From: Western South Dakota
I got the 525's in my 96 and they are a very linear cam, just keep climbing.. Not like the woods, but just keep going..from start to finish... I really like em', but I wanted something fairly mild for the valve train.. for your's though the 574's would kick a$$. Call Luke @Feuling. He's a very approachable person and very knowledgeable too.