4.86" or 123.45mm from top to bottom.

 

i posted this a while ago on a different forum:

i had the opportunity with both wg's on hand to take some comparision pics for anyone interested in changing from one to the other... some modifications would need to be done. flanges would definitely need to be cut off and changed to accept the different wg. both wg's come with flanges so this shouldn't be an issue. dimensionally they are a bit different as well.

tial on the left, synchronic on the right.


another difference you will notice right away is that the syncronic flanges are the same size. the tial dump tube flange is smaller than the manifold flange.


as you can see the synchronic comes with t-bolt clamps.


bottom view:


profile. the synchronic is much taller and thinner than the tial which might pose a problem fitting it straight forward on some manifolds... ie: ramhorns. on the plus side though it will fit in more narrow locations.

 

^^Nice comparison.

I've been doing some basic calculations between the tial / synapse / and my wastegate to see how much area is open for the exhaust to flow through the valve.

These are my approximate measurments on the volume of the opening of the main valve. Granted these numbers will not show actual flow results, but I'm going to assume the larger the number the more flow.

Synapse 50mm=49,087mm^3
Synapse 40mm=31,415mm^3
Tial 44mm=35,534mm^3
My 38mm wastegate=20,414mm^3

Numbers definatly prove size does matter

When I get my wastegate back, if the creep still persists, I think I'll be getting a synapse 50mm and just get a little conversion flange so it bolts up to the tial 44 flange. If at that point it STILL creeps, I'll have to remove the manifold and port the hole to a full 50mm

 

Nice work. We need someone with a flow bench.

 

You need to put some actual pressure to the WG's when they're assembled. You'll get to the spring's solid height well before you get to 0.92"

 

The specs quote the diameter of the valve, not the distance traveled. Beyond just a small amount of valve travel, the system is "fully open". With a 38mm valve like this, the difference in flow capacity between 20mm of valve travel and 30mm of valve travel will be next to nothing. Also, there's not enough room inside the unit housing to support that sort of travel, even if it were necessary.

I think the unit is functioning as designed. With your HP level, you are creating massive levels of flow and pressure inside the turbo manifold. My guess is that the 38mm wastegate is simply undersized for this sort of workload.

When a turbo manifold pressure is achieved that is high enough to crack the wastegate, excess exhaust flow is now vented around the turbine. When the wastegate flow capacity is exceeded, additional exhaust gasses have no choice other than to flow (in excess) through the turbine, causing the system to "overboost".