I am planning on putting a turbo on the Maro next Spring if it doesn't sell. I have a T64 I am using. What do I need as far as external waste gate, and a BOV. I have seen many different BOV on eBay, but don't know which to get. Waste gates are more scarce on there. I am planning on pushing 16psi. Can anyone help with the decision?

 

I am not a turbo guy. Other than working on an occasional GN.

The wastegate really only needs to be big enough to bypass enough exhaust gas past the exhaust turbine to keep from getting "boost creep" in the upper RPMs (i.e there's so much exhaust the turbine keeps over-revving even when the wastegate is all the way open). My expereince is with factory-type turbos with integral wastegates. They seem to be big enough to get the job done on a near-stock motor. That's not what you are doing. I'm out of answers on that.

BOV- many of the street racers have them, and not just the really fast ones. Only comes into play when you are shifting or slam the throttle shut quickly. Vents the boost when the engine needs no more air but the turbo hasn't spooled down yet. Apparently it helps the compressor side of the turbo live a longer life, etc. Strangely, I have seen some WICKED fast cars run without them on the street and at the strip. I suspect they help keep the turbo spooled up between shifts without having the boost "back up" into he intake plumbing and stall the compressor.

Obviously, I don't know my butt from a hole in the ground when it comes to turbos on the street but maybe it's worth a read anyway. Maybe not.

 

Thanks. I was weary of the BOV. Some say yes, some say no. Some say good insurance. When I get the auto, it won't be of utmost concern, but the insurance aspect is always nice. The wastegate is what I am most concerned with. That is a must. I see all sizes from 35-60mm. Very few are rated in HP capability. Most are in the mm size. How do I figure what I need? ANyone know?

 

As for a wastegate I'd reccomend the Innovative Turbo Systems ProGate(the smaller of the two they sell).I've been using it on my car the last two years and love it,good quality and rock solid boost control.I also use their multi stage boost controller that you might want to look into.Definatly a good thing for anyone who doesnt mind spending a few extra dollars for ultimate and accurate closed loop turbo control.

As for the blow off,I leave it for the Honda's - I dont think I know a single Turbo Buick that has one weather it is a stocker,a 9 second street stage 2, or a 7 second racecar.

HTH,
Steve

 

From what I have read BOVs are only necessary for manual transmission cars (do you shift without letting off of the throttle?). Autos only need 'em if you like to peg it and build up alot of boost and then let out of the throttle immedatily.

 

bov does help improve life of rotor, but the main thing is when the pressure is released, the turbo will keep spinning, instead of comeing to an instant stop when off the gas, which eliminates re-spool.

they are not only for honda's, they just put them on there because they sound cool. i have driven a fixed up eclipse gs-t with no bov, and the smae car with one installed, and the difference is day and night. without it, shifting really hamperd acceleration for the time the turbo took to respool, but with it, shifting did not have a slow lag affect on power, the response was perfect.

i would deff go with a blow off valve if you plan to run any amount of boost, may gain you a couple tenths in the 1/4.

thanks
anthony

 

Thanks for the help. I will be getting a BOV, but those are pretty easy to figure out. I will look into the Inovative Turbo wastegate.

 

Tial makes a very nice BOV for turbo applications over the 14psi range, doesn't look to shabby either .But as said above, recommended if you don't wanna ruin a turbo, and keep things more efficent. As far as wastegates go I have recently tried an external dump set up..... this is where the internal wastgate on a turbo is released into the atmosphere right from the exhaust housing, and not into the exhaust pipe. It separates any pressure in the exhaust housing area, and reduces boost creep. you can do it by building a wall between the wastegate port and the downpipe.

 

doesnt that put exaust fumes into the engine bay, and in turn into the passenger compartment? that would not be good on a daily driver, but im sure it would not be a problem on a drag car.
yes, tial does make a good wastegate, but they are $$$$$$$$$$$$$. turbonetics makes good wastgates for a number of applications, and at a little better cost.


good luck

thanks
anthony

 

I've been running external wastegate dump tubes since I turboed the Camaro. I've never had a problem with getting exhaust in the cabin, even though the tubes dump out front. Partly because you can't be at WOT for any long length of time, and at partial throttle, there usually isn't enough exhaust heat to spool up the turbos to the level where the wastegate is needed to bleed off pressure. I'm running two Turbonetics Delta Gates, fwiw.

 

maybe some of you missed that.... I was refering to a tial BOV. And an external dump on an internally wastegated turbo.

 

And I have a Turbonetics BOV billet that'll be for sale since I have the nice TIAL BOV sitting on the workbench, waiting to go on...

A.