01-13-2011, 05:02 PM #1
Vacuum in/Hg the 4tec engine makes at idle important for setting Turbosmart Bov
Does anybody know the vacuum pressure at idle for 08 Rxt-x in in/Hg ,i think it will be the same for all 4 tec engines at idle.
Need to know for setting the springpressure for Turbosmart Raceport Bov.
You can adjust the pressure by using different springs.
The ones using the Race port already , please give some advice.
I'm running 3Rude and Rotax ecu.
01-13-2011, 06:07 PM #2
vacuum pressure depend on your engine comp.
01-13-2011, 06:40 PM #3
01-13-2011, 07:13 PM #4
Vacuum pressure at idle speed on a stock 4 tec supercharged motor should be around 8" to 9" Hg sir....
01-13-2011, 07:29 PM #5
01-14-2011, 12:21 AM #6
Thanks for all the help guys.
Ijust needed an average so i have something to start with.
I thought around 9,because on the fuelcontroller at idle i got 1.1 - 1.2 volts,if you convert this you wil be around 9.
I know camtiming and more things can affect vacuum at idle,but the Raceport is set at 14 - 17 in/Hg when you buy it.
I orderd a springkit also.so i will be fine.
I start with the 9 - 14 springs and see how the response is,and if it will stay closed at boost.
01-14-2011, 01:07 AM #7
I think my gauge shows about 10...
01-14-2011, 03:34 AM #8
So I adjusted it down so that it didn't blow at Idle, and it really improved my response I guess it was because it is kinda building a tini bit of boost until you hit the throttle which gives the engine that initial rush of air.
I don't personally run one now tho. Good luck, hope you get it working nice.
01-14-2011, 03:52 AM #9
I'm also gonna set it ,so that it doesn't blow at idle.
Just have to find the fineline,for best throttle response and best protection against clutch wear.
I have never run one before,but since i have 3rude now,i really think it will improve clutch life.
3rude doesn't hold slip very well because the wheel is so heavy.
After doing many searches on greenhulk and google i think the best is the turbosmart,i don't trust the Hks that much,they are offered around $50 on ebay.
Hks usa says they are fake,but imo they aren't,it's just a cheap bov which is mass produced and sold very cheap at wholesale in asia.
Tial is also very good,but a little more expensive,so i will go Raceport.
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