Hello
i am really hoping someone on the forum can help me.

i have Godzilla Blow off valve part number 10565. This valve has 2 vacuum ports : 1 on top when the preload screw usually goes and a port below the diaphragm. This model does not have a preload screw.

This unit is installed on a Grand National and that community has not been very helpful. However, when appling vacuum to the top port it creates a vacuum leak causing a rich condition. The diaphragm and everything looks to be good so I am suspecting the vacuum is slightly lifting the valve causing the leak.

i have seen there is another Turbonetics part which seems to be the same with a preload set screw. This part number is 10756. If all that is different between the two items is the set screw I can tap threads to make this happen.

can someone that knows these items please explain:
1. Do I need a stronger spring internally to remove the vacuum from lifting the valve causing the rich condition

2. Tap new threads for the vacuum port and install a preload set screw to accomplish the same as above.

3. Does anyone have the instructions for me to understand why 1&2 is not correct.

4. Is Turbonetics out of business or sold to another company if so what company now owns Turbonetics.
Phone calls and emails are never returned.

Thanks in advanced

 

Turbonetics is currently still in business, but still only delivers products via a 3rd party sales network of distributors and dealers. They were sold to Wabtec Corporation over 12 years ago, but they still make and sell products. Their phone number is (805)581-0333

I know of someone here that has that same extremely large BOV, and have never known any of the springs in the valves to cause any particular "rich" condition. That's mainly in fuel trims to check for that. But this is just an old salt speaking here. I'm not sure if there has been any updates to that BOV since I last used one back in 2016 Phone: (805) 581-0333

 

Thank for your response. Please keep in mind the Grand National is very sensitive to vacuum leaks, possibly because of the MAF sensor that is used. However, this BOV is definitely creating a vacuum leak.

can you please ask your buddy if he has the instructions or diagram that came with his unit. I have tried calling the number you provided but that is the same number that nobody ever returns a call.

i also reached to Wabtec and spoke to someone that is supposed to return my call.

also there are 2 part # from Turbonetics 10565 and 10756.
Both valves look to be the same except one has the adjustment screw and 2 vacuum ports 10756

The other has no adjustment screw but 2 ports 10565.

if your buddy can provide either of those 2 Information this may help me out better than the position I am in now.

Thanks for your help

 

Have you tried connecting your boost/vacuum source line to the LOWER fitting and leaving the top fitting open ?

 

No I have not tried this yet. I wanted to get instructions first. Every other brand shows the bottom under the diaphragm connected to the compressor port.

thanks for the suggestion

 

The compressor port would be a suitable boost source for proper waste gate operation... connecting this same fitting to the intake manifold instead will give you spring pressure at the manifold. The top fitting is used for an electronic boost control valve (or manual boost controller) for increasing boost pressure above the spring pressure. If you aren't using either of these "boost increasing" devices... leave the top port open.

 

thank you for this explanation. I believe this is how I have it setup currently to solve the richness condition. However, I am running a boost controller to control the boost pressure.

Do you know of another brand BOV that is similar setup that I would be able to visualize the connection with a diagram.

Also why did Turbonetics make a 10756 with adjustments screw compared to 10565 without adjustment screw. I can certainly tap and thread a port for the top vacuum and add in an adjustment screw if needed.

Thanksbagain for your help

 

I’m running a NGR (Greddy Type S) BOV and that is how mine is hooked up. Upper port is open not connected to anything, bottom is to the I/M. This has been the setup for well over 7yrs, no boost creep, vacuum leaks or spikes

i do run a MBC but it’s connected in between the turbo compressor and Tial W/G

 

I just realized that you are talking about a Blow Off Valve and not a Wastegate... my bad. I use Tial products, so I am unsure as to how exactly your Godzilla should be plumbed. If you cannot find documentation online for the proper connections, might I suggest you deep-six the 20th Century product and get something modern... that comes with instructions.