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Old 10-08-2012, 01:29 PM   #511
sakurama OP
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4 spacers gained a fraction in the middle but lost a couple on top. Going back to 2 and splitting the jetting to fine tune. After that we'll pull his db killers and see if that makes any difference then it's on to my bike.

G
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Old 10-08-2012, 01:58 PM   #512
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Old 10-08-2012, 02:06 PM   #513
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Old 10-08-2012, 02:08 PM   #514
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Cams are stock.

Okay, Flanny's bike is done. The stacks gained 6-7ft/lbs in the middle - a solid 10% increase. We also gained hp but the majority of the gain is all in the middle. Big midrange torque increase. Here's the really interesting thing. We just overplayed the curves of Gino's 990R over Flanny's bike and Flanny's bike is actually making 2-3 more ft/lbs in the middle than the 990R. The 990R gains at the very top where the power tapers off on the 950 but overall the 950 FCR makes more in the middle. Where you want it.

Now onto my bike.

Gregor
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Old 10-08-2012, 02:10 PM   #515
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Cool, because I thought Flanny's bike was really strong BEFORE you did this.
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Old 10-08-2012, 02:41 PM   #516
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Originally Posted by sakurama View Post
Cams are stock.

>snip<

Now onto my bike.

Gregor

I tried to edit my cam timing post and ended up just canning it...

Looking forward to more progress! Hope your home rolled exhaust system is worth something positive in the dyno differences. I understand there will be displacement and cam differences, but that welding practice should count for something too!
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Old 10-08-2012, 03:29 PM   #517
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We're getting tired and dizzy from the fumes but on my bike the stacks were worth just under 10% in the middle and again my bike made significantly more torque than both Flanny's 950 and Gino's 990R. In fact the only place the 990R had an advantage was from 8500-9500 but everything below my bike made more power and torque.

We just tried replacing my X pipe for two straight pipes and it was a a big loss after 5000 rpm. We're trying to fit my H pipe now for a comparison.

G
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Old 10-08-2012, 03:39 PM   #518
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We're getting tired and dizzy from the fumes but on my bike the stacks were worth just under 10% in the middle and again my bike made significantly more torque than both Flanny's 950 and Gino's 990R. In fact the only place the 990R had an advantage was from 8500-9500 but everything below my bike made more power and torque.

We just tried replacing my X pipe for two straight pipes and it was a a big loss after 5000 rpm. We're trying to fit my H pipe now for a comparison.

G
I've been following this thread for a while and I really think the 39s are what is killing your top end. They just don't flow enough CFM. The mid range is getting pumped up thanks to the better tuning for that range (longer intake, cross-over exhaust). A set of 41s would improve the top end, though probably at the expense of low-mid range.
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Old 10-08-2012, 03:42 PM   #519
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Following this from the other side of the Atlantic!

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Old 10-08-2012, 04:24 PM   #520
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Old 10-08-2012, 04:26 PM   #521
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We just had that discussion actually. I'd like to try a set before I bore mine out but considering the roll off at the top I'm pretty sure you're right. Lots of thing point to going bigger on the carbs.

Alright, this makes me sad to report but my H pipe made a clean 1hp gain over my X pipe and while I'm a little bummed (because I'm going to have to remake it better now) I'm also happy to know I did the test and that its worth 1hp and a similar torque gain throughout so ill keep it.

Biggest surprise is that the stacks made 6-8hp more but a solid gain all throughout the torque curve besting even the 990R that was running a pipe. Chris will be pulling together some comparative curves which we'll share tomorrow so you can see the gains in the middle. For now we're going to get some fresh air and go celebrate with another dinner at Gino's (where both Flanny and I can boast that our bikes make more torque).

Okay, done for today.

Gregor
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Old 10-08-2012, 04:46 PM   #522
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Okay, done for today.
Very interesting stuff so far.
I have a set of 39's waiting to go into my 950 (kids absorbing all my spare time now)
What would it take to get my hands on some stacks? And a TPS mount? And final jetting specs?

I also have a used 990 motor on the bench - waiting for the day the 950 grenades (which is hopefully not anytime soon)
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Old 10-08-2012, 05:43 PM   #523
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So.....how's about welding a set of pipes for me......


You and Gino need to come down to the Gap and let Wheeler work his magic on Gino's 990. He'll fix all that herky jerky shit. Then we can have a race over the Cherohala Skyway so Gino and I can show you that FI is better.
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Katoom119 screwed with this post 10-08-2012 at 07:19 PM
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Old 10-08-2012, 06:04 PM   #524
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You guys are great for sacrificing so many brain cells at the alter of LC8 and then heading out to Gino's, to throw yet another metric of braincells away, bragging about all the dead braincells killed today...

Toast to the HP hunters!

edit to add:
Glad you can do away with your "x" pipedream, a pony is a pony... Means Y-pipes(2-1) are prolly even less desirable!
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Old 10-08-2012, 06:28 PM   #525
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... (where both Flanny and I can boast that our bikes make more torque).
Yeah, but he wins with a boast of riding during the months you guys were working on the bikes
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