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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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  #41  
Old 21st November 2019
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I found a HUGE difference in performance on my stock 1200 by 1) dialing in the carb 2) going to a TC88a ignition unit 3) getting a custom map for the TC88a (from Rico). The TC88a made the biggest improvement!
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  #42  
Old 21st November 2019
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Quote:
Originally Posted by Maxeffort View Post
That’s the lowest rating I’ve seen for 2004-2006 1200, elsewhere I’ve seen 67 Hp for the carbureted bikes and 70 for the newer EFI.
That 58.5 HP rating seems more in line for EVO 1200 with the old heads and D cams.
https://www.cycleworld.com/2018-harl...ter-1200-dyno/

"We ran the Iron 1200 on our rear-wheel motorcycle dyno in fourth gear to determine peak output from the v-twin. We documented 59.14 hp at 5,410 rpm and 67.08 pound-feet of torque at 4,050 rpm."
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  #43  
Old 21st November 2019
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Quote:
Originally Posted by NLXL View Post
https://www.cycleworld.com/2018-harl...ter-1200-dyno/

"We ran the Iron 1200 on our rear-wheel motorcycle dyno in fourth gear to determine peak output from the v-twin. We documented 59.14 hp at 5,410 rpm and 67.08 pound-feet of torque at 4,050 rpm."
That’s about correct, rear wheel HP VS, Flywheel.

Here Cycle World compares the bikes.

https://www.cycleworld.com/2016/03/2...rcycle-review/

Cycleworld dyno tests every bike they review.

The 2016/1200 iron made 61.6 RWHP and 67.8 TQ. The Iron ran the 1/4 in 13.22 @ 98.18 MPH

The 2016 Vulcan 650s made 53.5 RWHP and 42.7 TQ. The Vulcan ran the 1/4 in 13.4 @ 93.57 MPH

The Iron and Vulcan posted the same 0-60 time, the Iron was quicker 40-60 and 60-80 MPH.

I’d expect a stock 2005 to make a little less power than the EFI bike, I’ve read 3-4 HP less.

If the OP’s Vulcan is running away from his 1200c, it’s more evidence that his 1200 isn’t running right.
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Last edited by Maxeffort; 21st November 2019 at 02:44.. Reason: Fixed the TQ number
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  #44  
Old 21st November 2019
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Quote:
Originally Posted by Maxeffort View Post
That’s about correct, rear wheel HP VS, Flywheel.

Here Cycle World compares the bikes.

https://www.cycleworld.com/2016/03/2...rcycle-review/

Cycleworld dyno tests every bike they review.

The 2016/1200 iron made 61.6 RWHP and 61.6 TQ. The Iron ran the 1/4 in 13.22 @ 98.18 MPH

The 2016 Vulcan 650s made 53.5 RWHP and 42.7 TQ. The Vulcan ran the 1/4 in 13.4 @ 93.57 MPH

The Iron and Vulcan posted the same 0-60 time, the Iron was quicker 40-60 and 60-80 MPH.

I’d expect a stock 2005 to make a little less power than the EFI bike, I’ve read 3-4 HP less.

If the OP’s Vulcan is running away from his 1200c, it’s more evidence that his 1200 isn’t running right.
Yes, there is of course 'how to measure' HP. The rear wheel is the most honest one I think. I don't know where these 61 horses come from....https://www.motorcyclespecs.co.za/mo...0s_se%2018.htm
The link you provided with a comparison test says enough I think. The OP's bike should, according to this test, perform better than what he's experiencing now: "harley was very sluggish on acceleration"
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  #45  
Old 21st November 2019
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Quote:
Originally Posted by NLXL View Post
Yes, there is of course 'how to measure' HP. The rear wheel is the most honest one I think. I don't know where these 61 horses come from....https://www.motorcyclespecs.co.za/mo...0s_se%2018.htm
The link you provided with a comparison test says enough I think. The OP's bike should, according to this test, perform better than what he's experiencing now: "harley was very sluggish on acceleration"

I’d expect the 61 HP is manufacturers claimed flywheel horsepower. Rear wheel is usually 10-15% less depending on the final drive i.e chain, belt or shaft.

The best test is both bikes on the same dyno, and under the same conditions.

Last edited by Maxeffort; 21st November 2019 at 03:03..
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  #46  
Old 21st November 2019
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do not care about times, just the grin factor.
drop first @ 60 mph
drop second @ 90ish
drop third @ 120ish
no speedo left
vulcan keep up? not saying it can run neck to neck
my 1972 bsa thumper 500 would beat a sportster in the day till it topped out but it did have around a 200 pound weight to power advantage.
my 1959 thumper would run way faster, was built for salt with no brakes, just a pair of tt bars and beehive seat.
smoke a few cop cars in the day till they found out where i lived, father made me sell it.
the man that i got it from used to run with everett brashear.
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  #47  
Old 21st November 2019
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+1 I'm all about dropping a gear coming out of a corner and nailing it to the next one. Never use 5th gear. 4th in the straight shots. All about the midrange torque for me and I'm built for just that. Doesn't get any better.
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  #48  
Old 21st November 2019
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My 04' 883 with 1200cc pistons (10:1 Wiseco ) "W" cams, Screamin' Eagle ignition, ported head with big valves, jet kit, Vance & Hines mufflers, and Screamin' Eagle air cleaner would do 125 MPH according to the speedo. That is WFO for a couple of miles. Outran several big twins and a bunch of 1200 Sportys. With Progressive shocks and 404 Dunlops it was rock steady at that speed. Before the 1200 pistons the 883, dead stock, would do 110 MPH (indicated). When I installed the Screamin' Eagle ignition it would do 112, indicated.
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  #49  
Old 21st November 2019
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I think the officer said he didn’t lock on till 128m.p.h. and believed I’d been going faster cause I was slowing down. He asked how fast did I think I was going? I replied that I didn’t know as the needle was pointing at “Davidson”? Thought I was going to jail, don’t pass go and don’t collect $200.00. Got off with a warning, not bad for 75 over in a 55m.p.h. zone,eh?
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  #50  
Old 22nd November 2019
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Just a funny,broke a drive shaft in our race car 302 Chevy,Tattle tale tach was stopped on the second trip around !
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