http://www.vtr1000.org/phpBB3/viewtopic.php?f=9&t=14324

 

Here comes the run on people buying up long runners.... LOL!!!!

J.

 

the results confirm what I felt when I went that route. A very cheap and easy mod that yields a small but noticeable real-world improvement with virtually no downside.

 

I'm gonna try it out in the next few weeks when I get an hour or so to make the swap.... (BTW.. Don't ever by a 90 year old house owned by 80 year old people!!!!) I only ride my bike on the street, so the ummmpphhh down low in the rev range is perfect.

J.

 

Good luck. BTW, the swap takes at most ten minutes

 

i want to see the actual as purchased units.
this run was with stock honda parts.
im sure the group buy ones will do better.

 

yes, these are the OEM long runners. Our custom stacks are indeed better

 

Yeah.... ten minutes.... plus 2 hours of arguing with the wife about why I'm in the garage while she's watching our daughter!!!! LOL!!!!

J.

 

sounds familiar..... my daughter turns 1 in a week so I can relate

 

did you notice that proper jetting makes a bigger difference ?

if you haven't had your bike on a dyno you could get better gains putting
your money toward tuning than bolt on parts.

i also thought it was funny that the difference up top was said to be minor
but that same difference down lower was very noticable. hmmm
the fellow is not too bright ( or didn't word it correctly )

the top end loss is in the overrun portion of the curve.

looks like you could make a little $$$ mikstr. too bad we didn't
see this test before the first order.

tim

 

I'm tuning my stacks on my DIY dyno right now... I'm seeing around 3-4 hp across the board at above 3-3.5k... and about 4-5 hp 4.5k-7k with a few peak gains at around 5 hp... And I'd say once I'm done I'll be even at the bottom, possibly one short at the top end, then it drops of noticably after the overrun... So that part it didn't like....

The most noticable difference though is the smoothness of the curve... The small dips and peaks are gone... You could have done the curve after the stacks with three or four lines with a ruler... It's that flat... I'm guessing the new stacks have a greater capacity and hence smoothes out the air somewhat... but that's just me guessing...

Oh... And no, you won't see any sheets... This is a dyno built by myself from scrap parts... No fancy sheets... I get an excel spreadsheet... So I'm not going to put it up and have people argue about me making stuff up... This is facts to me, you can treat it as anything you like...

 

Thanks for the information, mikstr. It'll take me less than 10 minutes to change the runner but I'll need 25 minutes to find the air box lid screws that fall into the impenetrable darkness near the carbs.

 

LOL!!!! And that to my timing as well... now I'm closing in on 2 1/2 hours for this job!!!!

J.

 

Arguing 2 hours, finding parts in carbs 25 min, changing runners 10 minutes and tuning the bike another 2 hours or so...

No wonder a shop would charge an arm and a leg for the work...

 

I ain't payin' for someone looking fer the parts they lost!

 

I haven't seen this posted before, maybe a good spot for it. I got tired of taking the tank all the way off (damn hoses and such). I've been using a tie-down to keep the tank swiveled up outta the way for needle adjustments.

 

Nice idea.... I'll give it a try!!!

J.

 

Because of the variables of dynos from run to run I would say that that curve is just about meaningless. I have tried all different combinations of stock intake runners and couldn't tell enough difference from the seat of the pants to make a determination if one was better than the other.

 

That's the beauty of having your own dyno... I made 6 (that I saved data from...) runs today... One with stock runners, one with short, one with long and 3 tuning in the expensive one's... I makes a noticable improvement to me...

And yes, I had a second VTR handy for borrowing runners... That one will now get two long one's...

 

I'm not saying there isn't a difference between the stock configuration and two long intake runners, but I bet you couldn't measure it in the quarter mile or a roll on or a lap time.
How significant is the improvement on your dyno with two long runners versus the new super duper velocity stacks?

 

Two small runners = peaky, nasty character... Gained about 4-5 hp in the top end, just below overrun... granted I didn't tune, but it was not pretty... Big hole in the middle and I doubt it could be tuned away...

Two long stock runners... Small gains all over the midrange... 2-3 hp at best... But a bit lumpy curve and lost 2-3 hp at the peak, felt like it was somewhat out of breath at top end... It's also moving peak power down the revband a tad i think... Again I didn't tune which accounts for the lumpiness... My guess is if tuned, you get a nice fat midrange with little loss in top end... I'll find out later when the second VTR comes back to get tuned for those two longer one's...

The expensive one's see above...

The thing though... On the first run with them, without any changes to jetting through the two other setup's, they where not perfect... But they where noticably smoother than the two long one's... The short one's wasn't even competing in that category...

And once I got the carbs leaned out a tad, (I went down one size) the power delivery is smooth... No lumpiness, no big dips... Just a nice fat midrange that feels like it's not going to end... And it doesn't realy, it just eeks out towards the stock curve in the end... However on the overrun there is a big nasty hole... My guess is that the incresed flow of the nice radius compensates for the longer runners... But they didn't tune for that... So there it run's out of breath... And boy does it ever...

 

So again yeah... 2-3 hp win vs 4-5 hp win in the middle of the range isn't a big difference... But it's those 1-2-3 hp won across the large range that makes a difference in the long run... I'm more than willing to sacrifice 1-2 hp at the top to make the midrange wider and fatter...

And the difference is the feeling... The two long one's feel nice... These feels like they aren't going to end... Me likey... (I had to re-do the run through gears becuase I managed to hit the big hole after overrrun... I didn't look at the tach and it felt like there was more...)

 

was that dyno of a stock super hawk with after market funnels??? I just had my bike dynoed and it made 106 and 66.5 torque... r u guys going to get any more of those intake funnels if so let me know thx.

 

Prints are still available. All you need is to get them built, or find a group to pitch in to bring down the cost. The first batch is done so it`s up to whoever wants some now to act.

 

If we can get enough people, I just may get some!

 

 

All I can say is good luck (if history is an indicator, you`ll need it)!

 

Tweety, try the new billet long runners paired with a K&N, but make sure you add the air dam like on a stock filter...I've found the same results you did, but with the K&N is spins up to redline so much faster it will make you giddy!

 

Eric, i have a spare set that I bought from a chap from downunder that I'll sell ya...paid 385 AUS dollars for them which is about $300 USD...

 

I'm to darned lazy to even consider taking it apart right now... But next time it needs changing I'll dig out the K&N I have on a shelf somewhere (I gave up on tuning it before, it was pissing me off... )