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  GGUser653

  28 days ago

  Hey all. I just built a crazy 131 m8. Darkhorse crank & the works. +2.5mm valves, you name it. As we do we want more, so why not a nitrous kit?

  2021 Breakout 131 pro stock.

  Recommendations?

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  Hilly

  28 days ago

  Hang on!

  obisteve likes this post

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  408

  28 days ago

  
  

  Do you have a dyno graph as is ?
  

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  speedzter

  28 days ago

  So you have built it to race Pro stock ??

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  Hoodeng

  28 days ago

  It wouldn't have enough horsepower for Pro Stock.
  

  Jay-Dee and speedzter like this post

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  Jay-Dee

  27 days ago

  Pro Stock on a Breakout, low/flat sevens at over 180mph?

  
  

  My recommendation, a different motorcycle. Plus Pro Stock class is naturally aspirated as far as I know so no nitrous.

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  tussuck

  27 days ago

  Pro charger or turbo... Nitro is too short lived and a poor mans turbo anyway. 

  WideglidingNZ likes this post

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  perthhog

  24 days ago

  That’s where your wrong nitrous isn’t cheap or a poor man’s game 

  It’s quicker and easier to install not cheaper in the long run  turbo 

  Is far better for on going costs  no lag with nitrous though 

  But as mentioned any forced induction turbo,nos,supercharger 

  Won’t be in pro stock 

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  Hoodeng

  24 days ago

  Nit picking, but beware of terminology abbreviations.  Nitrous oxide gas is called nitrous for short, Nitro is short for nitro methane. I wouldn't run nitro in a street motor even if someone else were picking up the tab.

  
  

  Fuels eligible for Pro Stock bike is usually ANDRA homologated race fuels,like  VP QM25 ,  Roo. or ,Methanol. Some years back we looked at running methanol in a Pro Stock bike. It would for one thing have shifted us so far from baseline performance tuning for that engine as to have nothing else to compare it to.
  

  GGUser653 likes this post

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  Lushy

  21 days ago

  There will be no lag with turbo either on an engine that size, if the turbo is sized correctly etc... :-)  

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  GGUser653

  21 days ago

  Quoting speedzter on 17 Sep 2024 10:44 PM

  So you have built it to race Pro stock ??

  Not intentionally, just wanted a tuff bike that will get me into the low 9s. Has 200 @ wheel now on pump gas ⛽️ 

  I spoke with my engine builder and he said no nitrous hahaha

  I might see what it does as it is.

  
  

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  GGUser653

  21 days ago

  Quoting Hoodeng on 21 Sep 2024 03:40 AMedited: 21 Sep 2024 03:55 AM

  Nit picking, but beware of terminology abbreviations.  Nitrous oxide gas is called nitrous for short, Nitro is short for nitro methane. I wouldn't run nitro in a street motor even if someone else were picking up the tab.

  
  

  Fuels eligible for Pro Stock bike is usually ANDRA homologated race fuels,like  VP QM25 ,  Roo. or ,Methanol. Some years back we looked at running methanol in a Pro Stock bike. It would for one thing have shifted us so far from baseline performance tuning for that engine as to have nothing else to compare it to.
  

  Thanks for all the information. 

  Still using the m8 platform, just see what we can do with it. 

  Gets a tune next week after I put a few ks on it. I would definitely like to try methanol, but probably won't happen. As it is my street bike, so having it running on pump gas is necessary. 

  I'll let you know what it does, 

  
  

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  Hoodeng

  20 days ago

  Going down the methanol path is a lot more complicated than just re mapping/jetting for the fuel.

  The maintenance regime for this fuel is consuming to say the least, to use the term fuel economy with methanol is quite in error, there is no fuel economy to speak of, not to mention the build requirements for this fuel.

  Hilly likes this post

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  Lushy

  19 days ago

  At 200hp RW you are right on the limit of the stock fuel pump. Have you fitted a better one? 

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  Jay-Dee

  18 days ago

  Quoting speedzter on 17 Sep 2024 10:44 PM

  So you have built it to race Pro stock ??

  Quoting GGUser653 on 24 Sep 2024 12:11 PM

  Not intentionally, just wanted a tuff bike that will get me into the low 9s. Has 200 @ wheel now on pump gas ⛽️ 

  I spoke with my engine builder and he said no nitrous hahaha

  I might see what it does as it is.

  
  

  Edited as I realised that my question had already been answered.

  
  

  Low nines capability is going to be pretty hard to get down the track and actually achieve on a street bike and still two seconds too slow to be competitive in Pro Stock Bike.

  
  

  And at the risk of being negative I'm fairly confident that 200 rear wheel hp in a Harley Breakout isn't going to do a low nine down the quarter. I'm happy to be wrong though.

  
  

  paulybronco likes this post