So why remove it? Instead of just turning it off. I guess the same question can be asked about secondaries.
Are there any negatives on removing the secondaries?
Not really if boosted the secondaries can help force boost thru the BOV when you quickly close the throttle. As for removing the O2 sensor I used mine as a plug just shut it down. Wasn't until I vented crankcase gas into the exhaust when I finally removed mine. You can also alter the air fuel ratios so the ecu doesn't have any narrow band areas to monitor.
 
Not really if boosted the secondaries can help force boost thru the BOV when you quickly close the throttle. As for removing the O2 sensor I used mine as a plug just shut it down. Wasn't until I vented crankcase gas into the exhaust when I finally removed mine. You can also alter the air fuel ratios so the ecu doesn't have any narrow band areas to monitor.
I have the secondaries open all the time now and unchecked the 02 sensor. Feels a bit better but now i have some decel burbling or popping. It just had the lower gears at low rpms less than 100% so i might change it back
 
I didn't know that you bored your throttle bodies, I thought it was just us. ;)
Seriously, though, who did it and what'd it cost, if I may ask.
It may not be worth the investment. Rob gained just under .004% by doing that. On a minibike with 5hp that 1hp gain might be noticeable, but with over 200hp a 1hp gain probably won't be very impressive.
 
True, but a 1 hp gain starting with 200 would be a .5 %, gain, I think, .004 % wouldn't even be measurable.
 
True, but a 1 hp gain starting with 200 would be a .5 %, gain, I think, .004 % wouldn't even be measurable.
My math was wrong it was a .4% gain.
He went from 251hp to 252hp. No guarantee you'd get a full 1hp.
 
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