Custom wastegate on Stock Manifold

[LBCportagee]

I'm looking for an example where some has added the wastegate to the stock exhaust manifold but closer to the collectors. I've seen a couple example where people have put it off to the side (like on the turbonetics cast manifold-I think) but this doesn't make much sense to me. I'd rather have it piped similar to the ERL manifold starting at the collectors. I know there are "air baffles" inside that may have to be modified, but I'm wondering why nobody has attempted this (from what I have searched)?

I don't want to get into a discussion on the difficulties of welding cast, heating the parts etc. unless it is directly related to the location of wastegate.

 

[Steve93Talon]

The only stock type manifold with a gate on the collector that I've seen is Paul Volk't compound setup.

http://www.dsmtuners.com/forums/cus...1-my-compound-turbo-set-up.html#post151864273

 

[LBCportagee]

The only stock type manifold with a gate on the collector that I've seen is Paul Volk't compound setup.

http://www.dsmtuners.com/forums/cus...1-my-compound-turbo-set-up.html#post151864273

Thank You, that's definitely more of what I'm looking for. But morever, I'm thinking about piping it between the four bolts. Wondering if that was done primarily because of the placement of the turbo or for another reason? Maybe putting it between the bolts would weaken the structure too much.

 

[swifteagle]

Here's Jeff's mirage with a 2g manifold with a waste gate flange welded to it.

 

[LBCportagee]

That image is kind of hard to see the setup on the manifold. Looks like its off the #4 runner instead of #1 runner.

I guess this is an alternative to setting it up like the ERL manifold. ladsm.com - View topic - FS: 2g ported manifold/TiAL 35mm wastegate setup

I think doing it this way you would still have to change the runner/baffles because they are going to force the flow into the turbo instead of to the wastegate/point of least resistance.

So which of the three options do you think would be best and why.

1. To the side, off the 1/2 runners (like pauls)
2. Between the four bolts (like ERL)
3. On the center/top of the manifold (linked in this post) with heavy porting.

 

[99gst_racer]

Thank You, that's definitely more of what I'm looking for. But morever, I'm thinking about piping it between the four bolts. Wondering if that was done primarily because of the placement of the turbo or for another reason? Maybe putting it between the bolts would weaken the structure too much.

The primary reason I didn't plumb mine right in the middle of the collector on top was because the other turbo sat right there and there just wasn't clearance. I don't forsee any issues if you decide to go that route. Just make sure the tube is oriented in a way that allows easy access to all turbo bolts.

Though, I should mention that I used to run an external gate off of the #4 runner and it worked great. Most people don't come close to wastegating what one exhaust runner flows anyway. On my old compound setup, I was gating a large volume of exhaust around the 16G and for longer durations, so that was the only reason I plumbed from two runners. But for any single turbo running a normal boost level, having a properly sized wastegate anywhere between the head an turbine wheel is going to do the job just fine.

 

[LBCportagee]

The primary reason I didn't plumb mine right in the middle of the collector on top was because the other turbo sat right there and there just wasn't clearance. I don't forsee any issues if you decide to go that route. Just make sure the tube is oriented in a way that allows easy access to all turbo bolts.

Though, I should mention that I used to run an external gate off of the #4 runner and it worked great. Most people don't come close to wastegating what one exhaust runner flows anyway. On my old compound setup, I was gating a large volume of exhaust around the 16G and for longer durations, so that was the only reason I plumbed from two runners. But for any single turbo running a normal boost level, having a properly sized wastegate anywhere between the head an turbine wheel is going to do the job just fine.

Thanks for the info. I guess that's why a handful of manufactures went that route as well. Ultimately then where I decide to put it will depend on plumbing everything and what's easiest.