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Discussion Starter #1
Does upgrading to either the Screamin Eagle or V&H muffler require a change to the fuel injection settings?
 

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You might not have to, but you should. The bikes come very lean. Increasing the air flow, either through a freer flowing exhaust (smaller change), or an air cleaner (bigger change), leans things out even more. The bike will run hotter, you'll notice a significant increase in the popping at deceleration, and the worse case scenario is burned out valves. Probably not something you need to worry about right away, but yes, as soon as you can you should either get a stage one tune or even better, an ECM controller like the FP3 or Dynojet. If you add the air filter it's definitely necessary.

I believe the Street does have an O2 sensor that should take minimal care of trying to keep the bike from getting waaay too lean, but someone should correct me on that if I'm wrong.
 

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You can use the Bassani, Vance & Hines and Screaming Eagle slip on mufflers without having to change the stock fuel set up. How do I know this, My dealership had 3 Street 750's set up with each different slip on so I could hear how they sounded. Now, if you change the stock air breather and increase the airflow with a Vance & Hines, Yes, you will need to add a fuel pack.

Btw, I decided to go with a Firebrand Loose cannon slip on muffler which is sitting in the box in my living room cause its -3 degrees F. It sounded good and the price was less than the other 3 mufflers like $100 dollars less. Not knocking the others, I almost went with the Bassani.
 

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Discussion Starter #6
Based on the replies, it sounds like the stock air intake is ultimately the bottleneck. So changing just the pipe only changes the sound, not airflow. Thanks for all the replies! I'm going to go with the V&H.

If I feel the need to add power I'll go with the dealer flash upgrade and upgraded air intake.
 

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Based on the replies, it sounds like the stock air intake is ultimately the bottleneck.
I most definitely agree with your assessment, here is what I wrote in another thread, " [i purchased] the vance and hines VO2 air filter in December which made all the difference! Especially over that garbage stage 1 screaming eagle filter I had gotten along with the "download" Speaking of which, to any other members reading this please don't make mistake guys, take my word for it and save yourself the time and money and just get a non-HD-aftermarket high air flow filter like the V&H, the difference is night and day. I regret not taking before and after video footage but I simply did not predict that the new air filter would have the all encompassing impact on my ride as it did (engine breathing better an louder, louder and smoother exhaust note, shifting-gears feels smoother and not as "clunky", better engine response, smoother acceleration [especially in the low end]). I honestly only initially got it because I liked the aesthetics of it over the "black box" that comes with the 750s....when I even talked to the dealship about how my latest purchase would affect my warranty they tried to tell me that the difference in performance over their stage 1 SE filter would be minimal if anything...oh how utterly full of **** those people can be!"
 

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Discussion Starter #8
Can the bike be left out in the rain with the V&H air intake kit? I park it at a train station for the day. In Austin, it can be a 0% chance of rain, and flash flood an hour later. :)
 

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I most definitely agree with your assessment, here is what I wrote in another thread, " [i purchased] the vance and hines VO2 air filter in December which made all the difference! Especially over that garbage stage 1 screaming eagle filter I had gotten along with the "download" Speaking of which, to any other members reading this please don't make mistake guys, take my word for it and save yourself the time and money and just get a non-HD-aftermarket high air flow filter like the V&H, the difference is night and day. I regret not taking before and after video footage but I simply did not predict that the new air filter would have the all encompassing impact on my ride as it did (engine breathing better an louder, louder and smoother exhaust note, shifting-gears feels smoother and not as "clunky", better engine response, smoother acceleration [especially in the low end]). I honestly only initially got it because I liked the aesthetics of it over the "black box" that comes with the 750s....when I even talked to the dealship about how my latest purchase would affect my warranty they tried to tell me that the difference over their stage 1 SE filter would be minimal if anything...oh how utterly full of **** those people can be!"
Did you reflash the bike after you put on the V&H breather? I am planning on adding the V&H breather and having the dealer do the stage 1 download.
 

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Did you reflash the bike after you put on the V&H breather?
No because my understanding is that the ECM download through the dealership is a preprogrammed set of parameters. So it would be a waste of money to get "reflashed." Besides even the dealership told me that the ECM download should be just fine with the VnH air filter, and that if it was not that the exhaust would "make extra popping noises." (Rather vague I know, but that is all they could tell me).

Anyways I have 900 miles booked in with the VnH air filter and I have not noticed nor had any issues this far, very happy with the purchase.

Your ride will surely show you how thankful it is you got rid of that silly black box and got a real air filter! ;-)
 

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Discussion Starter #11
Sorry I may have my terminology of. I assumed they would "reflash" the ECM with a new stage 1 image. Didn't know they could reprogram the existing software.
 

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Can the bike be left out in the rain with the V&H air intake kit? I park it at a train station for the day. In Austin, it can be a 0% chance of rain, and flash flood an hour later.
You COULD leave it exposed under such conditions but overtime your filter will get dirty much much faster. You can get a "rain sock" to pull over your air filter if you want to save yourself a little bit of maintenance in the long run. Here's the one I got: http://www.revzilla.com/motorcycle/roland-sands-venturi-rain-sock#fitment_tab
 

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Discussion Starter #13
Thanks much for that link. I'm going to go for the V&H muffler first, zombie mirrors second (lol), and V&H air intake w/ rain sock you mentioned + HD software update last.
 

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I got the V and H and the FP3 today- man! What a difference! The bike actually feels lighter and responds really nicely to every subtle move you make with the throttle and gears- if you can afford it, run, don't walk, to the dealership and have it installed - night and day does not even begin to describe it- additionally you have bluetooth connectivity to your smartphone to provide all the other readings the bike did not come with such as RPM etc..
 

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I got the V and H and the FP3 today- man! What a difference! The bike actually feels lighter and responds really nicely to every subtle move you make with the throttle and gears- if you can afford it, run, don't walk, to the dealership and have it installed - night and day does not even begin to describe it- additionally you have bluetooth connectivity to your smartphone to provide all the other readings the bike did not come with such as RPM etc..
Exactly. I did all the install myself, that is the V&H slip-on and air cleaner, FP3, phone mount, USB charging cable, etc. So nice to see RPMs at a glance, as well as what gear I am in. No more searching for 7th gear. I also changed out the heat shields with the Harley Buckshots.
 

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Question for you all.

I've already installed the Screaming Eagle intake and am looking at either the Bassani (Long Straight) slip on or TBR COMP-S Slip on.

With that, which exhaust do you recommend and do I need to retune the engine? Understand the bike runs lean (helped my US-Spec bike pass emissions here in Japan), but what do you all recommend there?

Thanks!


Sent from my iPad using Tapatalk
 

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Yes the Street has one O2 Sensor for Each Cylinder.


You Might have to run Mid Grade octane. Wont know until you actually install a new muffler.
 
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