Full Blown Turbo Kit Owners Topic

[King Tut]

Originally Posted by mike the snake

Does the BOV spring pressure need to be changed when running higher boost?

Or is it more about how much vacum you have at idle?

The vacuum is what opens the BOV up. It doesn't care how much boost you are running as that just means it is further from vacuum.

[mike the snake]

Thanks. I Juuust was watching some BOV vids and figured out how they work.

[69Marshall69]

Originally Posted by King Tut

I would say the correct spring is an 11 or 12 psi spring. I ended up most happy with an 11 psi spring and a couple aluminum washers I got from McMaster Carr. This will vary slightly depending on how much vaccum your car pulls at idle and where/how you are getting the vacuum/boost reference that you are running to the BOV.

Thanks King Tut for the quick reply, I have recently reconfigured my vacuum lines to create a safer boost environment by tapping the turbo housing and running that directly to the wastegate so there's less of a danger of boost increase going engine kabooom. The vacuum lines are seperate from that, running from the brake vacuum line as directed by FBM's kit install instructions. My boost gauge shows a max negative vacuum of -19 to -21, at idle its still very close to this negative pressure. So i was wondering if maybe it were impossible to have the BOV work off that vacuum area properly? if there is a possibility of running a different vacuum that has a greater pressure difference from boost release and idle?

ps- it is proper to have the BOV shut at idle and open at full vacuum?

cheers

[pleong]

Just got the car back a few hours ago and the fans died already...

[Reaper]

Originally Posted by pleong

Just got the car back a few hours ago and the fans died already...

yeah mine died too in the parkinglot after rolling it off the dyno. I managed to stuff my stock fans in there until I figure out what I want ro do next.

Sent from my SAMSUNG-SGH-I747 using Tapatalk

[pleong]

I'm installing the new rad and rad shroud tomorrow..

[Dipstik-sportech]

So I finally got away from the snow and went south to BIR this weekend.
Ran over a dozen passes on Kato and drove him home 6hrs without a problem.

I'm car 10148, had some wheelhop issues in first gear and on occasion he would spin second so bad I would drift lol. All said he ran decent and I'm a set of slicks and a 3.73 diff away from 10's I think.

The Frozen North

[FullBlown]

Originally Posted by Dipstik-sportech

So I finally got away from the snow and went south to BIR this weekend.
Ran over a dozen passes on Kato and drove him home 6hrs without a problem.
Attachment 82959
I'm car 10148, had some wheelhop issues in first gear and on occasion he would spin second so bad I would drift lol. All said he ran decent and I'm a set of slicks and a 3.73 diff away from 10's I think.

The Frozen North

Good Job Cale

[King Tut]

Originally Posted by 69Marshall69

ps- it is proper to have the BOV shut at idle and open at full vacuum?

cheers

Idle should be very close to full vacuum. The only time you get into a larger vacuum situation is when off throttle and engine braking. Ideally you will want the BOV shut in both conditions or you can get into a situation where the car could stutter and possibly stall in those engine braking situations when you quickly stick the clutch in.

[King Tut]

Originally Posted by Dipstik-sportech

I'm car 10148, had some wheelhop issues in first gear and on occasion he would spin second so bad I would drift lol. All said he ran decent and I'm a set of slicks and a 3.73 diff away from 10's I think.

The Frozen North

Plenty of MPH, drop that 60 foot and you are in the 10's no problem. Dat maple syrup is doing work.

[Dipstik-sportech]

Yeah I'm going to ditch the radials and go to a full slick next time with a 3.73 diff so I don't have to shift to 5th

The Frozen North

[Reaper]

im glad we are about to have a proven recipe for 10's on this platform.

[Dipstik-sportech]

Oh there's no doubt in my mind it is a 10sec capable platform in the configuration I have. And considering I drove it there and back getting 33mpg I think that's pretty cool. I put quite a few full drag cars to shame as well.

The Frozen North

[Reaper]

so im running my BOV, MBC and wastegate off my intake manifold with a brown spring in the BOV and it doesn't open under partial boost and I get a little bit of turbo flutter (5-8 psi is when its pretty audible). Only WOT full boost do I get a clean fully open BOV sound. Should I try a different vacuum configuration(ie tapping the compressor housing for the MBC and wastgate) or try a new spring first? car pulls 19inHg of vacuum sometimes a little more. I cant find any springs locally so id have to wait and I hate that.