Waste gate canisters bw 8374
 

I was just wondering what waste gate canisters everybody was using on the 8374. From factory it comes with the medium boost canister

Depends on a lot of factors, but the two biggest ones are;

Target Boost Pressure

Exhaust system size

turbosmart <3

it has replaceable springs to make it whatever you want.

https://www.full-race.com/store/borg...port-actuator/

https://www.full-race.com/store/garr...ol-solenoid-1/

This is what I'll be running. Proven. Excellent. Control.

I've only worked with one, but that WG canister is a pile of garbage just like everything else Turbosmart I've ever used. Bottom chamber leaks past the shaft once the arm starts to extend. Customer went back to the shop that supplied it and gave him a washer and o-ring to put between the canister and mounting plate, a solution they had apparently worked out on the other leaking canisters they had installed.

If that was a common problem, why have we not heard more about it?

Mine seems well made, but I haven't run it yet.

Well it is the one I have seen so it could have been defective, however that seems unlikely as the selling shop had seen the issue iirc. Perhaps TS changed the design. More likely, most people don't check for issues like that until a larger performance issue surfaces. Well made does not equal well designed. It is still somewhat functional even with the boost leak - external gates have some air leakage between the valve guide and valve stem for cooling/expansion purposes after all. However the IWG75 doesn't have those requirements and in this case the leak was easily fixed...

https://cimg2.ibsrv.net/gimg/www.rx7...57b3c6e0a0.jpg

Post #52 was the first time I heard about leak issue on these units

https://www.rx7club.com/build-thread...1102929/page3/


It seems like its not a random problem

I'd just start out with the medium canister it comes with, and use a good electronic boost controller. I didn't see a big difference between the low and medium canisters. The low cracked a little sooner, but the eventual full boost was the same.

The way mine is mounted, it would be pretty difficult to disassemble and install a new spring while it's on the car, so if you're removing it anyway, might as well just use a BW unit... they are cheap.

Well, now I want to know what size washer and o-ring. :lol:

if the turbosmart actuator did leak, it would be on the bottom part of the actuator... which the BW doesn't even have.

the bottom port is to hold the gate closed so the boost ramps up faster.

if you just get a single port turbosmart it won't leak at all.

Mine leaked like a sieve from where the actuator rod goes into the body. There is no wiper seal or anything, it's just a bronze bushing that the rod rides in. I bench tested it after running for a couple weeks and it pissed air like crazy. After a bit of a runaround, I sent it back to TS, they told me they didn't find a problem BUT they replaced the bronze bushing anyways. When I re-bench tested it it still leaked a small amount, but was much better, which I'd expect without a wiper seal. I will say that when I got it fixed, the same open loop boost setting would throw it into boost cut, so it did make some difference in boost response and overall boost.

Intresting topic, I have the same dual port actuator and i notce that if i boosted multiple times my boost starting to decrease. I have it setup with a Greddy EBC using a 4 port mac valve. after reading this post i thinking of putting back the original BW actuator.

I use the medium actuator in most cases. I have been able to hold as low as 8lbs of boost with it and a correctly designed turbo system.