Suzuki GSX-R Motorcycle Forums Gixxer.com banner

Part 13 Velocity stacks

1 reading
1.7K views 19 replies 14 participants last post by  aronhalt  
#1 ·
An e-mail sent to Marc just letting him know that I look forward to seeing gains from his stacks.------------------Marc I see you ran a full exhaust with your set up,. Did you do a run with stock stacks?????? Just to see the gains and where they may be????????????? My pc should be here on Friday so Saturday I will spend my time doing your R and D and will tune bike using stock stacks then will re-install your stacks with no other changes and with in a 20 minute window as to make sure things stay close. I will again tune your stacks and see where the gains or losses are and will post graphs on gix and bikeland. I will post the actual dyno runs with their A/F readings to show that both are tuned the same even if not to your liking but it will be fair to stock and yours. I hope to see increase as I wasn't able to get refund for them. But good or bad I will post for others can see for themselves and can decide if the $250.00 is worth it of if just a $70.00 filter is the way to go and put the other $250.00 into something more worth while. Should I just mail you the bill for the dyno time and R and D ? Or should I assume that it would be the same as getting a refund to ill stated claims on your products. See ya Monday!!!!!!!!!!!!!!!!!Online!!!!!!!!!!!! Dave
 
#4 ·
Gee, I wonder why their exchanges are hostile....

Good comparison for sure (if dont objectively).

With that phrasing I think you may have some bias and may not want things to turn out for their stacks since you have an obvious bone to pick with Marc for not doing what you wanted or expected. Something to consider when posting.
 
#5 ·
haha i love it.. Excited to see the results. I bet hes wishing he just gave you a refund.
 
#7 ·
Looky Looky my p/c just came in and I will have it in an hour or two. Will do runs on Friday morning so we can see results by Friday night and all can enjoy a nice weekend. Also will have A set of BST carbon rims in a week or so and will a same day test of stock rear rim vs. carbon to see exact hp gain from the weight savings. These also will enhance handling quite a bit as I hear so the gain should be two fold.
 
#12 ·
You guys are right about the wheels. Not so much as there is not an increase in acceleration but that the dyno cant decifer that there is less weight. Other wise a harley would have less hp just due to its weight. The only way is a speed to distance change and I will try to figure something out tomorrow. The wheels are mounted on my friends zx-14 that I will ride in the morning, but he cant stop calling me and saying how much quicker the revs pick up not to mention it turns in like a 750 now. Although a lot of money you have to think of costing half because you could always sell the rims for at least that if you wanted. So you have to lay out the money but you get to keep half of it if you dont wreck them. I think a top gear roll on between to bikes from say 40 mph before and after installing the rims would be able to show the increase in power to the ground just measured in bike leanghts instead of hp. As 7.5 lbs is to a hp. We will find a bike leangth gained will equal some number of hp. Well on another note just started hooking up p/c 3 so I can finish up tomorrow night for fridays stack testing. Also picked up a dry shot of N.O.S. today so Saturday we can have those numbers as well.
 
#13 ·
Lighter wheels = more horsepower to the ground. Spun weight eats power and the dyno should be able to measure a significant difference to wheel weight. Lighter wheels gives you more power to the ground, reduced unsprung weight (better traction), and lower bike weight.
 
#16 ·
Sorry for delay, forgot about fathers day and soccer tournaments. Just completed dry shot N.O.S. kit also so I can do that test also all in one day. Here is a quick pic. Using 2 lb bottle for dyno run and Top end 200 mph attempt and have 2 cheaters for daily driving. 2lb bottle looks cool and can be hidden with a spare helmet as shown.
 

Attachments

#17 ·
aronhalt said:
Lighter wheels = more horsepower to the ground. Spun weight eats power and the dyno should be able to measure a significant difference to wheel weight. Lighter wheels gives you more power to the ground, reduced unsprung weight (better traction), and lower bike weight.
With the decreased unsprung weight, the bike will gain speed more easily, and this may FEEL like you picked up a few more ponies. But measureable on a dyno?
 
#19 ·
Im not liking the bottle location... But hurry up and get that thing on the dyno already :) heh
 
#20 ·
Throttlestop said:
With the decreased unsprung weight, the bike will gain speed more easily, and this may FEEL like you picked up a few more ponies. But measureable on a dyno?
There will be a difference, however, one could argue whether or not a dyno is precise enough to measure it.

You gain horsepower by reducing piston mass, rod mass, and crankshaft mass. The tires are merely an extension of these parts. They have inertia, and it takes power to spool them up.