My newest mod I am working on
- Thread starter thrasherfox
- Start date
Naw... it's original and looks good to me.
Thanks for the compliment Warbaby..
Actually throttle response seems fine.. (now) I have not road her yet however and that was going to be the real test for me.
I road her around town with just the headers only and it seemed as though throttle response was slow and it seemed as though I could tell it was not burning fuel properly and I did not have low end power that I did with pipes on.
I was supposed to go for a ride yesterday but it rained.
I don't know if it is my imagination or what but using the foot or so of the original chrome pipe seems to have made a positive improvement over the way the engine responds to the throttle.
As I stated earlier also, when I ran just the headers without the chrome extenders, the bike seemed real loud and I could smell the odor of what smelled like unburned fuel (would that be considered running rich?) with the chrome extenders on I do not smell it anymore and as of odd as it may seem it does not sound as loud as it did with just the headers. Actually acceptable. With the headers only it was just too loud and honestly kind of sounded like crap. The extenders, as short as they are, for whatever reason, seems to have knocked off a decibel or two that is now with in an acceptable range for my hearing.
Unless of course I just made myself deaf with just the headers and now I am just dumb
The only thing I can think of is when I looked at the extenders after I cut them I noticed they were not just a pipe as I thought they would be, they had an inner pipe which caused a mild restriction coming off the header and this created a chamber in-between the two pipes (inner and outer chrome pipe) that is filled with heat blanket material.
Do you think it is my imagination or could that little subtle change actually made that much of a difference?
I am going to try and take it out for a quick freeway run today if it is not raining.. I will be able to tell more by that on its throttle response and over all performance.
Thanks again for the encouraging response
BT - Did you check out the video I made and put a link up to? did it just for you, per your requestWicked lookin' set up there Ron. I likey. I just wish I could hear it.
Do you think it is my imagination or could that little subtle change actually made that much of a difference?[/QUOTE]
It's too late (or too early) for me to be very analytical. So, I'll just say that changes in exhaust length, diameter, and/or volume can have substantial effects upon mechanical tune--throttle response, power, and especially the nature of the powerband. Assuming correct mapping, and depending on engine load, RPM, and throttle position, etc., those effects may be beneficial or not. In terms of theory, it's almost too complex (and tiring) to discuss in typed words. Your approach is interesting and I look forward to seeing before and after dyno results. Theory is fine to determine design parameters but the real test is if the mods give you what you want on the dyno and street/track. My speculation for your mods is that, if you experience losses, they will be at low RPM with gains at mid and high RPM. Good luck and keep us posted.
It's too late (or too early) for me to be very analytical. So, I'll just say that changes in exhaust length, diameter, and/or volume can have substantial effects upon mechanical tune--throttle response, power, and especially the nature of the powerband. Assuming correct mapping, and depending on engine load, RPM, and throttle position, etc., those effects may be beneficial or not. In terms of theory, it's almost too complex (and tiring) to discuss in typed words. Your approach is interesting and I look forward to seeing before and after dyno results. Theory is fine to determine design parameters but the real test is if the mods give you what you want on the dyno and street/track. My speculation for your mods is that, if you experience losses, they will be at low RPM with gains at mid and high RPM. Good luck and keep us posted.
Tom -
Actually I have read your entire Exhaust Myth vs Reality.
Awesome reading!!!!
I read it when you posted it on here and I also noticed that you put it up on your web site (titled "Exhaust Theory") and I have re-read it numerous times.
Which I might add thank you very much for writing up such a document
All of the ideas I have about what I want to do with my exhaust is based on your entire explanation on how exhaust works.
I just wasn’t sure if in reality a 1 foot extension off the header would make that big of a difference, but it seems that it probably has.
I understand from your paper that at low RPM's you need back pressure for optimal performance but at your higher RPM's you need more flow and less back pressure and that most exhaust system try to find a happy medium and try to provide the best of both words to the extent they are able to.
I do want to go down and get a Dyno on it. maybe one with the stock exhaust (I still have them) and then one with my extenders with no other mods done yet just to see the difference.
I will probably check with them on Monday and see how much they charge for doing a dyno.
I will keep everyone posted with updates..
Actually I have read your entire Exhaust Myth vs Reality.
Awesome reading!!!!
I read it when you posted it on here and I also noticed that you put it up on your web site (titled "Exhaust Theory") and I have re-read it numerous times.
Which I might add thank you very much for writing up such a document
All of the ideas I have about what I want to do with my exhaust is based on your entire explanation on how exhaust works.
I just wasn’t sure if in reality a 1 foot extension off the header would make that big of a difference, but it seems that it probably has.
I understand from your paper that at low RPM's you need back pressure for optimal performance but at your higher RPM's you need more flow and less back pressure and that most exhaust system try to find a happy medium and try to provide the best of both words to the extent they are able to.
I do want to go down and get a Dyno on it. maybe one with the stock exhaust (I still have them) and then one with my extenders with no other mods done yet just to see the difference.
I will probably check with them on Monday and see how much they charge for doing a dyno.
I will keep everyone posted with updates..
ralnsplder
Registered
It's too late (or too early) for me to be very analytical. So, I'll just say that changes in exhaust length, diameter, and/or volume can have substantial effects upon mechanical tune--throttle response, power, and especially the nature of the powerband. Assuming correct mapping, and depending on engine load, RPM, and throttle position, etc., those effects may be beneficial or not. In terms of theory, it's almost too complex (and tiring) to discuss in typed words. Your approach is interesting and I look forward to seeing before and after dyno results. Theory is fine to determine design parameters but the real test is if the mods give you what you want on the dyno and street/track. My speculation for your mods is that, if you experience losses, they will be at low RPM with gains at mid and high RPM. Good luck and keep us posted.
Hey WarBaby, I was actually thinking of doing a similar mod to mine, but this weekend I talked to a mechanic that trains and certifies most bike mechanics here in hawaii and he said that you would lose a lot of power by not running pipes and that not having back pressure could mess up the valves over time. He said it really didnt effect custom bikes because they didn't have much hp to begin with but with sportbikes, it wouold really hurt them. Is any of this true? I have actually thought of making a custom exhaust but after he told me that I kind of dropped the idea. any thoughts??
Hey Thrash, Very Interesting... Was Curious though, is there a clamp from your silver mids that you cut, clamping them onto the Black portion?
If so, what about Fabbing up a 2-1 outta stainless, maybe firing down towards the ground, or exiting left or right. Could be interesting... You figure it's not going to get TOO loud so long as the factory Midpipes are left intact.
Your solution is interesting though, looks cool.
If so, what about Fabbing up a 2-1 outta stainless, maybe firing down towards the ground, or exiting left or right. Could be interesting... You figure it's not going to get TOO loud so long as the factory Midpipes are left intact.
Your solution is interesting though, looks cool.
Hmmm interesting..
I don’t know if I would go black with the rear peg set. But I have thought about removing the exhaust mounting.
I wanted to finish the exhaust mod with the PC3r and the other stuff to make sure it was going to run properly.
if everything works out then I will eventually remove the exhaust mount that is attached to the rear set
Hey WarBaby, I was actually thinking of doing a similar mod to mine, but this weekend I talked to a mechanic that trains and certifies most bike mechanics here in hawaii and he said that you would lose a lot of power by not running pipes and that not having back pressure could mess up the valves over time. He said it really didnt effect custom bikes because they didn't have much hp to begin with but with sportbikes, it wouold really hurt them. Is any of this true? I have actually thought of making a custom exhaust but after he told me that I kind of dropped the idea. any thoughts??[/QUOTE]
It's too late (or too early) for me to be very analytical. So, I'll just say that changes in exhaust length, diameter, and/or volume can have substantial effects upon mechanical tune--throttle response, power, and especially the nature of the powerband. Assuming correct mapping, and depending on engine load, RPM, and throttle position, etc., those effects may be beneficial or not. In terms of theory, it's almost too complex (and tiring) to discuss in typed words. Your approach is interesting and I look forward to seeing before and after dyno results. Theory is fine to determine design parameters but the real test is if the mods give you what you want on the dyno and street/track. My speculation for your mods is that, if you experience losses, they will be at low RPM with gains at mid and high RPM. Good luck and keep us posted.
ralnsplder -
Go to Warbaby's web site http://www.veltune.com/
And on the lower right hand side there is a link labeled "Theory" read it, understand it, memorize it.
Awesome reading.
Once you read it, it makes a lot of sense and from that you can kind of make a game plan. That is what I am doing.
Actually all I am doing is the playing stage, I actually have some real serious ideas that I will be pursuing down the road.
From what I gather, no back pressure will cause you to lose power in the lower RPM range, but in the higher RMP range you will gain HP by minimizing back pressure.
The extenders I made do create a little back pressure over just running headers but not as much back pressure as a full pipe or full exhaust.
I called the tuning place today and they are closed. If I can manage it I might try and get some dyno’s done on it this coming Saturday.
I want to do a Dyno with stock exhaust, then one with the cans that I modified using Bike382’s exhaust mod, then a final dyno using my extenders only.
Then I will do a final Dyno after I get it tuned once I get my PC3r and do the pair valve and airbox mod combined with my extenders
Stunnah -I like it...I'll rest easier once you get it dyno'd...Sounds pretty close to a dump pipe...A happy medium...Deep serious growl...Can I get in on the partnership...
Wasnt planning on going into business, but you know I would hook you up.
But you already have a turbo
Glad you all like it.
My wife saw the thread and made a comment about how much money I am dumping into the bike.
She thought I had bought the extenders
Just like my tag reloacator.. I made it, didnt cost me anthing but time and material
Rev -
The silver mids are stock mids just cut. I used the clamps that are already on them.
The stock clamps secure them real tight and because they are not that long I dont see where other clamps or additonal mounting will be required. The pieces are light
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I talked to a mechanic that trains and certifies most bike mechanics here in hawaii and he said that you would lose a lot of power by not running pipes and that not having back pressure could mess up the valves over time. He said it really didnt effect custom bikes because they didn't have much hp to begin with but with sportbikes, it wouold really hurt them. Is any of this true? I have actually thought of making a custom exhaust but after he told me that I kind of dropped the idea. any thoughts??[/QUOTE]
Okay, let's examine this. You have 4 stock header tubes that merge into two head pipes, which cross into the "X"-pipe and exit as two shortened "mid" pipes without mufflers. What the mech guy is saying may be true if the engine is not properly mapped for the increasesd flow that results from removal of the restrictive mufflers. If properly mapped, it should be okay without any bad engine or valve effects. When back-pressure is reduced, a loss of torque at low RPM is largely caused by raw, unburned fuel escaping out the exhaust valve that normally would not escape because of the presence of factory back-pressure. The back-pressure tends to keep the fuel in the combustion chamber. More exhaust flow (for "X" amount of fuel) = leaner mixtures which can get too hot for the exhaust valves. The payoff from the mod SHOULD BE more mid-range and high-range power (again, if properly mapped for optimal air/fuel mixtures).
I hope that makes sense.
Okay, let's examine this. You have 4 stock header tubes that merge into two head pipes, which cross into the "X"-pipe and exit as two shortened "mid" pipes without mufflers. What the mech guy is saying may be true if the engine is not properly mapped for the increasesd flow that results from removal of the restrictive mufflers. If properly mapped, it should be okay without any bad engine or valve effects. When back-pressure is reduced, a loss of torque at low RPM is largely caused by raw, unburned fuel escaping out the exhaust valve that normally would not escape because of the presence of factory back-pressure. The back-pressure tends to keep the fuel in the combustion chamber. More exhaust flow (for "X" amount of fuel) = leaner mixtures which can get too hot for the exhaust valves. The payoff from the mod SHOULD BE more mid-range and high-range power (again, if properly mapped for optimal air/fuel mixtures).
I hope that makes sense.
