PRESSURE RELIEF VALVE

[Mountaintech]

Is anyone running one of these? BOVs are the ticket for getting rid of pressure spikes in throttle closure situations, but what kind of protection do we have in case of an overboost situation ie. wastegate malfunction etc. Any thoughts?

 

[peteracing]

Use the "automatic intercooler ejection system"

 

[Mountaintech]

If you're lucky the intercooler will blow off, but that usually isn't the case anymore because most guys have figured out how to keep them in place with the higher boost levels. I know of at least 2 engines that would have been saved if there had been a PRV.

 

[slymax]

You can always let off if your wastegate stays closed, LOL. Happened to me last season when my boost tee stuck....20lbs boost...holy sheet. Put some good gas in it while I figured it out, I know better than to keep it pinned with the gauge wrapped, "kaboom"

 

[Mountaintech]

Slymax, As long as you're always looking at your boost gauge and you're able to let off your argument is valid. Try being in a do or die situation and then having to modulate the throttle so you don't overboost. You never have time to look at the boost gauge when you're doing the killer climbs. I think a PRV is the way to go.

 

[snowy1]

Whats over boost I can,t seem to get enough.

 

[Climbmax]

Whats over boost I can,t seem to get enough.

Thats cause you are at 30,000 feet

I'd be inerested in PRV..........I know someone who can do that.
CM

 

[Mountaintech]

Heres the one I was looking at awhile ago. www.greddy.com then click on turbo and turbo accessories.

 

[snowy1]

your right about that Randy, its hard to control 18-20 lbs. up here. its got to be a hand full at low elevation

 

[DoktorC]

The BOV is used primarily to relieve pressure when the throttle plates close suddenly...like between shifts in a car. Without the BOV, when the throttle is closed the boost "backs up" and stalls the compressor wheel..not cool..I haven't seen one used just to relieve overboost...but my turbo is on my car not my sled..so what the hell do I know lol. I have never understood why you guys don't run BOV's especially if you do more then just WOT up the hill. If you're on and off the throttle I would think that keeping the turbo spooled would be a priority...AND it makes that really cool sound so you can scare Mustang's ..or whatever you guys race....

 

[snowy1]

most guys are running bov,s on there turboes.

 

[DoktorC]

well......nevermind then....open mouth...insert foot .

 

[Mountaintech]

DoktorC, all the later MCXpress turbo systems have a BOV built into the side of the intercooler that are actuated by a vacuum signal just like you said. People running over 15lbs of boost are finding that adding a second BOV is necessary for smoother performance. The system has however no overboost protection without a relief valve.

 

[spray25]

I think the Greddy is a great idea. Mak sure you need it though. My turbo will max out at about 13-14 pounds at my elevation. It is unlikely with my low comp pistons that any engine damage would result from a stuck waste gate.

Others may have an issue though if their turbo can exceed whatever their safe pressure limit is.

 

[Freak]

I run one.... Its called a track, and when I get an overboost it spins faster. forged pistons, double gaskets and 112 octane baby!!!