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You can spend the better part of the rest of this year on your game plan which hasn't proven successful for most of the people that have tried it including myself or you can pull the intercooler and weld a waste gate on it and get to where you need to be in a couple of weekends.
In the current configuration, there is a battle between pressure zones and exhaust flow. The pistons, cylinder walls, heads, and intake manifold are caught in the middle.You said you removed the APS kit because of backpressure and installed the TTiX kit. Now you are wanting to add backpressure to this kit? The backpressure ends up as additional pressure in the engine. Adding backpressure via the exhaust on this setup is also going to limit the overall power capability of the combination and decrease reliability.
A waste gate on the intercooler relieves pressure and gets the system to achieve an equilibrium. Venting the cold side pressure means a certain amount of flow won't make it to the cylinder and therefore doesn't make it out the exhaust. This in turn slows the turbine wheel down which is attached by a shaft to the compressor wheel. Slower wheel speeds mean less airflow and less manifold pressure.
Put it on a high pressure area where the air traveling to it would have a direct shot at the diaphragm. Look at a turn in piping and put it on the outside, etc. if it made too much noise for you you could run it to one of the inlets etc.
This is a picture of where TTiX normally mounts the BOV. I would mount the WG on the opposite side. The waste gate will need to have a boost reference line going to the bottom of the diaphragm similar to if you were using this on the exhaust. You'll have to play with spring sizes until you get it to where it opens the right amount to give you the desired boost.
Last edited by Turbo-Geist; 06-28-2018 at 02:35 PM.
Here's a picture from when the coupler wasn't fully clamped one time. This was enough to where it would only make 10 psi. It won't take much of a leak on the waste gate to get you to where you need to be. I would possibly keep the 3 psi springs in the exhaust waste gates initially since you know the car will already make 18 psi with those in there.
Maybe some of the supercharger guys can give input on what spring it would take for the waste gate on the intercooler.
Grandsport Corvette (LS3) Stock engine/heads.
BTR twin turbo cam.
TTIX with PT 62/65 turbos and Champion 3 inch down pipes. Z06 3 inch midpipe and Akrapovic Axle back.
I'm having the same issue that it seems many have had. I can't make anything less than 18lbs. Currently my tune is limited to 4800RPM and e85. This is with a 3lb wastegate spring running on just spring pressure.
I've read about porting the wastegate port on the turbine housing. Does anyone have first hand knowledge if this really works?
I've also purchased 46mm wastegates.
I've also read about the one person who installed wastegates on the turbine housing. That is a last resort.
Any other recommendations?
So exactly what gates have you on now ? What is the flow path like ? If you remove the w/g spring entirely so the w/g is effectively fully open, what happens ?
As per usual, I took the more difficult route. This evening I finally finished up all the "modifications" I was planning. As follows:
-Cut wastegate pipes and fabricated for 46 mm wastegates. It's a very tight fit, but I am happy with it.
-1.5 psi wastegate springs.
-auger style muffler inserts, placed behind the turbos ( my down pipe is cut/v-banded for ease of installation).
Tested backpressure pre insert and post, no real increase that's notable.
Tested the car on the street on just gate pressure... 3psi peak hold boost! So it works. I'll be hooking up the boost controller tomorrow and testing to find any negative feedback. If all is well, I'll be scheduling for tune asap!
If I ever figure out how to post photos, I'll add some tomorrow.
Except the port exit on the turbine housings is still the same size. In my case, boost control appeared better in the lower rpm range but from 5200 and up, there was no change.
I'm posting this on behalf of George at TTi, as he no longer has an account here. If interested, you can call the shop to discuss. His message: "About a year ago we changed our angle from 15 degrees to almost 40 and has helped wastegate control a bunch. If anyone would like to ship their exhaust housings in, we would modify at no charge."
I'm posting this on behalf of George at TTi, as he no longer has an account here. If interested, you can call the shop to discuss. His message: "About a year ago we changed our angle from 15 degrees to almost 40 and has helped wastegate control a bunch. If anyone would like to ship their exhaust housings in, we would modify at no charge."
What type of combos has it helped to allow for better control? Any specifics on manifold pressure before and after the change? Engine size, mods, downpipe size, etc., would be beneficial to know.
Hopefully you got it figured out by now, not really much of a forum person, but TTiX kit here, 3in downpipes, 62/65. Car was able to be tuned at 10 psi 91oct only, but on the streets i usually see about 12-14 psi. 4lb waste gate spring with an innovate fail safe boost controller. I have stock mufflers, 3in piping all the way back. I am running a katech torquer 110, on a built LSX 427.
Hopefully you got it figured out by now, not really much of a forum person, but TTiX kit here, 3in downpipes, 62/65. Car was able to be tuned at 10 psi 91oct only, but on the streets i usually see about 12-14 psi. 4lb waste gate spring with an innovate fail safe boost controller. I have stock mufflers, 3in piping all the way back. I am running a katech torquer 110, on a built LSX 427.
Getting this thread back to live
did you do any modifications to the kit?
Can not go less than 15psi at all!
377cid, 3”DP, 3”piping and stock 2.5” NPP mufflers.
1. I presume/hope you mean the bottom chamber that blows the gate open ?
2. I would almost never use an intake vacuum source for control.
Also...your numbers seem contradictory to Turbosmarts instructions, as well as the use of intake instead of near compressor control source. All these things will make a big difference. Although 38mm may be a little small. But fix the plumbing first.
This is the most basic setup you can use, if you cannot achieve your low boost target with this arrangement, then you need more gate flow.
Last edited by stevieturbo; 12-31-2020 at 06:18 AM.
06-28-2018, 10:48 AM
