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  #71  
Old 7th July 2019
Tomcatt Tomcatt is offline
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WOT is the (relatively) easy part. What makes the bike nice to ride is smaller throttle opening (low MAP) low load areas and how they transition into areas where you start making power. There's also a big part of the map where you're doing little but decelerating and just want to pick up throttle nicely exiting those areas.

I understand the "keep the revs up" thing. Look at the stock mapping and you see why. There's no fuel or timing in the under 4,000 rpm under 40% throttle EPA test area. The engine barely runs. Mine, stock, ran like crap down there which ain't good as it's where you spend the most time. Now I'm getting BT type manners at lower revs.
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Last edited by Tomcatt; 7th July 2019 at 15:00..
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  #72  
Old 7th July 2019
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I noticed the same thing when I added timing down there. The shuddering at low rpms, barely rolling all but went away. I just added a couple more degrees down there but backed off again to 28.4 max @ WOT with a less aggressive curve. In fact the 28.4 in the 30 inhg isnt until 5500rpm. 28.1 @5000. I backed it off all the way to 24 inhg which is the power curve.
I'll post a pic of what I have now. I think it's a real winner.
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  #73  
Old 7th July 2019
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60Gunner 60Gunner is offline
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  #74  
Old 7th July 2019
Tomcatt Tomcatt is offline
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These motors definitely seem to want more lower rpm part throttle timing than the maps I've seen supply.

Last edited by Tomcatt; 31st August 2019 at 17:36..
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  #75  
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I figured you were. Initial switch 2 is a little higher yet. Mine is considerably higher than any other custom map I've seen tho. I'm going to run this a couple hundred miles and tweak it a little more if necessary there.
Everywhere else is rock solid tho.
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  #76  
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I've got the 97 in. The 96 shouldn't be in any sportster according to Steve at Mikuni. The 98 is for mpg but too lean for any performance build imo. I do have the richer 96 and leaner 98 in my kit. The taper is identical on all of them as far as clip position. Only the straight part differs.
Ill be watching my plugs. May end up going back to the DCPR8E again. ;p

Last edited by 60Gunner; 7th July 2019 at 22:33..
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  #77  
Old 16th November 2019
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I made a baseline dyno run: 76 HP, 72 ft/lbs. That's with the stock 1200 top end, cams just "dropped in", 185 psi cranking pressure, Rush slip-ons with 1 3/4" baffles, Hammer Impact air cleaner assy. No tuning to extract that last HP. Just everything as I was riding it.

61 ft/lbs at 2,000 rpm.
72 ft/lbs at 4,600 rpm
60 ft/lbs, 76 hp at 6,600 rpm.

Rev limiter was set at 6,700. Pulled smoothly on the dyno from 2,000 rpm. 70+ ft lbs from 4,000 to 5,200 rpm. No big humps or dips. Nice 13.0:1 AFR. It just runs nice.

This was done with 28 degrees max (full throttle) advance. With only 185 psi cranking pressure it may have wanted more at higher revs.

A 1275 kit with 10.5:1 compression with proper squish clearances and cleaned up ports is next. I have switched to 2" baffles since the dyno baseline.

Last edited by Tomcatt; 2 Weeks Ago at 19:08.. Reason: added ignition advance
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  #78  
Old 17th November 2019
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Now imagine using a cam where that exhaust actually helped you.
10.5:1? You really didn't plan well. Sounds more like an afterthought to improve your disappointing choice in cams.
560s and you'd be busting 100hp. Not too late. Lesson learned.
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  #79  
Old 17th November 2019
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Home grown
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  #80  
Old 17th November 2019
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And that's on a carbed 1250 @ 10:1 with SSs. Imagine those cams on an EFI 1275 @ 10.5:1 with Rush slip ons. Probably pushing closer to 110hp.
Or spread the power around and get your low end back with the 570s and go flat top 10:1. You'll still get 90+ hp a little sooner and better in the middle. Both are way better cams.
Those 551s moved a little power around. From the bottom to the top. Little being the key word.
Overlap is your friend. Especially with EFI and a good exhaust.
I'd cut my losses. Might get lucky and find someone to buy those cams for $150 and pay for half the cost. 2 hours of time since you're half way there doing the 1275. It's a no brainer.
And those 551s are best suited for 10:1 btw.

Last edited by 60Gunner; 17th November 2019 at 16:18..
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