On the Tial wastgates that come with the Greddy TT kit which port is used when connected to the the intake manifold??? I thought the top port was used only when connected to a boost controller and the port on the side was used for with the manifold??? My wastegages are opening at low vacuum (not in boost) and I'm using the port on the side?????

 

I've always used TiAL wastegates with boost controllers but I thought when you didn't use a boost controller you were supposed to connect the side port to a vacuum source and vent the top port (like you have done). Your wastegates are opening in vacuum? That's weird. I know that the WG will start to open before max boost but I always assumed they would stay closed at least until they started seeing boost. Are you going into boost at all? If so, what psi are you reaching?

 

Maybe your boost gauge is installed incorrectly. Where are you taking your boost reading from? The line may be pinched or leaking, leading you to believe you are at a lower pressure than you actually are.

 

I just installed the kit and it runs great. I have only run the boost up to about 4psi but the reason I think the WGs are opening soon is I hear what sounds like venting boost when shifting in 2nd gear up but not under load just before I shift. It only lasts for a second but I'm not in boost that's why I thought I was using the wrong WG port. The gage is vacuum/boost and it reads vacuum (maxs out about 26) fine. Only run boost up to about 4. Will open it up today (if the rain stops).

 

Could it be you have the BOV run incorrectly. On some BOV if you connect the signal to the wrong port it will open as you transition into boost.

 

I just purchased a TiAL 38mm WG locally for cheap and will be installing it on my Vortech SC'd setup within the coming months and will need to know the same questions. I will not be running a boost controller so I will leave 1 port open, or the hose barb installed with nothing on it, but which one? Also, where will I need to run the one line going to the WG? Will it be sufficient to tie it into the line going to my bypass valve or will I need to hook up at a different location, like up near the manifold(SSV)?

 

side port is to a manifold source, top port is left vacant, or connected to a boost controller.

If you are hearing some boost leakage, it probably not coming from the wastegate, becuase you wont hear anything. It is probably coming for a leak somewhere else...maybe the BOV?

 

Not sure where the sound is coming from. I'm currently not running a BOV!!!! It only occurs when I'm backing off the throttle to shift and the vacuum is less than 10. If I keep the vacuum about 10 to shift it does not make the sound (sounds like air bleeding off)?????

 

Maybe it is some compressor surge

 

Sharif when you drive without getting into boost do you hear any abnormal air sounds???? Throttle response is great and much more responsive than the stock. Thought I would remove the vacuum source to the WGs, not get into boost and see if the sound is still there???

 

Uh, don't do that. If you remove the vacuum source to your WGs, they won't open, you'll overboost, your engine will blow into a million pieces, and you will cry. If you don't want to go into boost, you can pull your wastegate springs out. I don't know what you're hearing, but I like Sharif's idea about compressor surge.

 

Your right that would be a BAD thing. It's loud enough I should be able to record a audio clip........ thanxs for assistance

 

Update on unknow sound. Sharif was correct, according to Greddy tech support I have compressor surge and need a BOV. Does the BOV need to be upstream of the air flow sensor on exit side of the IC, should the vacuum source be independent of the WG vacuum source and what is the procedure to set the correct bo pressure?????

 

BOV should be placed downstream (or prior) to the MAF sensor. We mount them right after the 90 degree elbow coming off the driver's side of the intercooler. For stockish boost, I would leave the adjustment screw in the middle of the range. You can adjust it later if needed. The vaccum source for the BOV is a standard manifold vaccum source of your choosing. Doesnt have to be dedicated.

 

You got ahold of Greddy support?! Wow. Glad to hear you have it figured out. You and Sharif are both right. Place your BOV "upstream" (or prior) to the MAF sensor.

Any air that passes through your MAF sensor will be read by the ECU as going into your engine. So, if you place a BOV between your MAF and TB, your ECU will think that any air released from your BOV has gone into your engine. This will result in innacurate readings and throw off your A/F ratio.