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  #51  
Old 27th July 2015
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That is a good question.
Is it a Dynojet dyno?
If so, what program or software are they using?

As others had said too... 97.5 ft lb of torque is the kind of number you'd expect from a 88" or 90".
Honestly I'd be impressed with 87.5 ft lb from a 1250cc Sportster on a Dynojet dyno.
Anymore info would be appreciated.
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Old 27th July 2015
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The first dyno results are probably accurate. You have a very nice mild street build. The motor is going to have a hard time to breathe with stock 883 valves and w cams. If 883 heads with impact service don't flow as good as stock 04-06 xl1200 heads you really can't compare to the dyno charts hammer has posted for stage 1 1250.
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  #53  
Old 27th July 2015
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Quote:
Originally Posted by Sleeper View Post
That is a good question.
Is it a Dynojet dyno?
If so, what program or software are they using?

As others had said too... 97.5 ft lb of torque is the kind of number you'd expect from a 88" or 90".
Honestly I'd be impressed with 87.5 ft lb from a 1250cc Sportster on a Dynojet dyno.
Anymore info would be appreciated.
I just got off the phone with the dealership. The dyno is a Dynomite brand dyno. Their Land and Sea model. The software it runs is a program called Dynomax. So its not a Dynojet Dynamometer.

As far as the heads the 883 heads with impact port job are supposed to be equal to the 2004 - 2006 1200 heads according to Aaron at Hammer. So the charts should be comparable. But that would be for Aaron to weigh in on.
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  #54  
Old 27th July 2015
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When I look at his sheet, I see about what I would expect in terms of the shapes of the curves, and about 10% more than I would expect for the numbers.

Keep in mind that at low rpm, the small valves of the IMPACT ported 883 heads are not a big restriction. You can fill the cylinder at low rpm through IMPACT 883 heads, no problem. The cam timing of the "W" grind is conducive to low rpm cylinder fill as well. So the shape of the torque curve (essentially a map of the cylinder fill) makes sense ... good fill down low, dropping off pretty significantly as the rpm goes up. The power curve is just a mathematical function of the torque and rpm, so it just follows the torque.

It's the raw numbers that seem high to me. We've had multiple customers break 90lb-ft of torque on 1250cc, with a high of 95.1. I did a 1250 build for one of my personal bikes once that made 97. So it's not impossible. But not a lot of 1250's break 90lb-ft.

Something else to consider, that makes it more possible, is that it's STD corrected. STD tends to be generous to the numbers if you're anywhere near sea level, to the tune of a couple percent.

So it seems like a stretch, but it's not outside the realm of possibility. Main thing I want to know is whether or not this was a Dynojet dyno. Dynojet dynos are very, very consistent from one to the next despite what people believe. But if this is some other kind of dyno, all bets are off.
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  #55  
Old 27th July 2015
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That may explain the discrepancies in the numbers. If I ever get any of my bikes dyno'ed again. I'll have to look for a Dynomite dyno.
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Quote:
Originally Posted by cdirk View Post
I just got off the phone with the dealership. The dyno is a Dynomite brand dyno. Their Land and Sea model. The software it runs is a program called Dynomax. So its not a Dynojet Dynamometer.
OK, so that explains it.
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I don't think a set of cams would help this motor. The valves are too small to support the 1250 at high rpm. You'd need headwork that includes bigger valves and a set of cams that will help the motor breath at high rpm.
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Quote:
Originally Posted by Boudwood View Post
I don't think a set of cams would help this motor. The valves are too small to support the 1250 at high rpm. You'd need headwork that includes bigger valves and a set of cams that will help the motor breath at high rpm.
You may be right but that Dyno Hammer performance has shows the 570's add 3-6HP over 3500 RPM's. So it may be worth it. Also will lower my compression which is running a bit high at 225. After that the only way to get more where I ride under 5000 RPM's would be to make it an 88". Putting a Tach on shortly to get a better idea of what RPM's I ride at.

As far as actual figures I think the bike probably is pulling around 80HP and 85TQ. which is somewhere between the two Dyno's.
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Old 27th July 2015
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W cams, second to none on the torque side, Bassani exhaust, second to none on the torque side and well ported impact heads (Hammer) with regular size valves, second to none on the torque side.

How come nobody saw it coming? Top fast on the get go. He must also run 883 gearing, second to none on the torque side, you got what it's called a wheely machine, enjoy it.

Will choked on the 1/4 drag strip, 1/8 here I come.
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Old 22nd November 2015
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Here is mine Stock 883 with Hammer 1250 kit DK customs Hi flow V&H short shots & SERT tuner Only other upgrade is Clutch and oil pinion gear. http://s1374.photobucket.com/user/bs...33945.jpg.html
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