simba Posted February 23, 2016 Share Posted February 23, 2016 Mohawk can you confirm you complete bike setup? Exhaust, Cams, Intake? What is the best setup for the dual velocity stacks? 4 stock "short" stacks mounted to the airbox? 4 stock "short" stacks mounted ?mm below the tops of the 1st units Air box cut as per "big airbox mod" thread Very impressive power gains and weight losses!! Link to comment Share on other sites More sharing options...
Member Contributer BusyLittleShop Posted February 23, 2016 Member Contributer Share Posted February 23, 2016 Bigger is not always better... my story... My friend Stephen called long distance from England because he justinstalled a $900.00 HRC air box on his RC45 and saw 120HP on thedyno... mmmmm... together we wondered if the stock box be modified???We found that stock RC45 throttle bodies are 46mm but the air box wasrestricted to 40mm... no problem... I'll bore the air box out to 47mmon the milling machine...I drew up plans for 47mm bell mouth based on the stock 40mm bellmouths and purchased a block of black Delrin...I'm not happy doing repetitious work but I labored long hours tomachine 4 each bell mouths with my best accuracy...Don't you love when a plan comes together especially if it turns outperfect???Now I had an unrestricted air box with my own 47mm bell mouths... itwas the best I could do to replicate HRC $900.00 air box... not tomention I wanted to keep my home made K&N filter...Time to put the Mod to the test... this is Dave at ChandelleMotorsports...No joy... I lost 1.8HP on the dyno... so bigger is not better in thiscase... a whole week worth of work shot down in flames... it seemsHonda got the intake velocity right for a stock pipe after all... airboxes are like tuned instruments... alter the holes and the tunesuffers... Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted February 23, 2016 Share Posted February 23, 2016 What did you do to compensate for the necessary fueling changes? Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted February 23, 2016 Author Member Contributer Share Posted February 23, 2016 Mohawk can you confirm you complete bike setup? Exhaust, Cams, Intake? What is the best setup for the dual velocity stacks? 4 stock "short" stacks mounted to the airbox? 4 stock "short" stacks mounted ?mm below the tops of the 1st units Air box cut as per "big airbox mod" thread Very impressive power gains and weight losses!! Engine is stock, apart from the following;-My own spec cams CoIl on Plug, from cbr1000rr 2007 model Matched throttle body to head rubbers TBR full exhaust, with Delkevic mid length Ti silencer Big airbox mod with ramair intake Velocity stack tops (the round lips) mounted straight on to airbox base, for 10mm stack height. Plus secondary stacks, base flush at 10mm from airbox. Rapid Bike Racing fuel controller with one MTB O2 sensor. What did you do to compensate for the necessary fueling changes?Still running the single MTB, bottom & top end are fine, mid range from 5500-7500 still being tuned, but winter interrupted play :(Hey Larry, you should try my dual stack idea with those big intakes I think it would help your fuelling ! Link to comment Share on other sites More sharing options...
Member Contributer BusyLittleShop Posted February 24, 2016 Member Contributer Share Posted February 24, 2016 Hey Larry, you should try my dual stack idea with those big intakes I think it would help your fuelling ! Mr.RC45 fueling is not the problem... my air box will remain stock because our air box works like a finely tuned instrument... any wild ass guess mod disrupts this highly engineered resonant to where to you're producing nothing but sour notes... The airbox inlet tubes, or “horns”, are specifically designed to provide a resonance that can increase the total airflow by up to 10-15%. Second guessing these can cause the engine to loose power and increase the intake noise as in my case... Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted February 24, 2016 Share Posted February 24, 2016 No not you mohawk, I was asking busy little shop. I know you are running Rapid Bike, so you have the ability to make air flow changes/mods and then see if the AFR is going richer or leaner. That way you can tell if the corresponding mod is pulling in more air/demanding more fuel or not. I know you put a lot of thought and calculations into the design of the velocity stacks and they are not "wild ass guess mods". On the other hand, I don't know why busy little shop was opening his air inlets from a conservative 40mm to a gigantic 47mm with out any ability to make the necessary fueling changes. I am not surprised the rc45 ran sour after doing that, but I am surprised that he feels the need to compare his untuned wild ass guess mods to your highly thought out and tunable mods. Link to comment Share on other sites More sharing options...
RVFR Posted March 7, 2016 Share Posted March 7, 2016 Hmmm, I can't helper wonder what I might see with my 5th gen. I got some great dyno numbers, and now see I need a full exhaust system to make it even better, but this stack thing sort makes sense.. ;) what goes in, gota come out though. Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted March 7, 2016 Share Posted March 7, 2016 Hmmm, I can't helper wonder what I might see with my 5th gen. I got some great dyno numbers, and now see I need a full exhaust system to make it even better, but this stack thing sort makes sense.. ;) what goes in, gota come out though. Unless you are on the confirmed buyer list for the Tyga headers, good luck finding a real full system. Link to comment Share on other sites More sharing options...
RVFR Posted March 7, 2016 Share Posted March 7, 2016 LOL yea yea yea... we'll see when TYGA gets it together what comes of it. I'm praying it works out, but??? Link to comment Share on other sites More sharing options...
Member Contributer Stray Posted September 26, 2017 Member Contributer Share Posted September 26, 2017 Just thinking out loud but can the dual-stack setup not be replicated by just "floating" the OEM velocity stacks off the bottom of the airbox with spacers? OK, there will be no bell mouth on the bottom stack (there is no bottom stack at all) but it does create a dual setup with a gap. It also lengthens each stack by the size of its gap. Just curious... Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted September 28, 2017 Share Posted September 28, 2017 On 9/26/2017 at 5:54 PM, Stray said: Just thinking out loud but can the dual-stack setup not be replicated by just "floating" the OEM velocity stacks off the bottom of the airbox with spacers? OK, there will be no bell mouth on the bottom stack (there is no bottom stack at all) but it does create a dual setup with a gap. It also lengthens each stack by the size of its gap. Just curious... You are definitely going to want a "bell mouth" at both of the air entrances. Link to comment Share on other sites More sharing options...
jerritt Posted September 30, 2017 Share Posted September 30, 2017 Has anyone tried this with r6 stacks. I was thinking r6 on the bottom and vfr on top or would that open up the bottom too Much? Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted October 2, 2017 Share Posted October 2, 2017 On 9/30/2017 at 4:24 AM, jerritt said: Has anyone tried this with r6 stacks. I was thinking r6 on the bottom and vfr on top or would that open up the bottom too Much? I am running pain r6 stacks on the bottom, it definitely does not "open up the bottom too much". Link to comment Share on other sites More sharing options...
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