Extend internal wastegate travel using stock actuator like this?

[Join]

Hi!

I got a little idea when doing some work on my engine today..

This have not been tested, it's just an idea. Don't do this and expect it to work!


The stock actuator has a 10mm travel. This will give me about 30degree angle on the internal wastegate when open.

How to extend travel using a unmodified actuator?

Lets post my prototype pictures

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Closed wastegate

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Open wastegate

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The idea:

On the top I want to weld or tap a bolt into the housing. The lever with the slot move on this.

I want to make a T-shaped lever, and transform the 10mm movement to approx. max wastegate travel. I will get less force in the middle of the movement, but it will close with almost stock force.


This is not described very good, I'll look into it better tomorrow..

 

[fwdmaster]

Looks like a good idea

 

[Defiant]

No payoff. The wastegate won't be flowing any more by opening that far.

 

[Join]

No payoff. The wastegate won't be flowing any more by opening that far.

Will there not be any gain? Even slightly? I am using a dual mbc setup. Low boost in 1st gear, and by choice with a key-controlled switch inside, so if my girlfriend or anyone is driving, they can have stock powerlevels. And I don't want it to creep.. It's a small 16G.

 

[tkelly27]

Even with the WG flapper disconnected I creep up past stock levels on my big 16g. I'm not saying this won't work, but porting will most likely have a bigger influence.

Tell your girlfriend to keep her foot out of it : D

 

[Join]

Even with the WG flapper disconnected I creep up past stock levels on my big 16g. I'm not saying this won't work, but porting will most likely have a bigger influence.

Here is how I have done it

Tell your girlfriend to keep her foot out of it : D

The problem is that the boost come on quicker than she let her foot off, resulting in burning rubber here and there.. She don't need 300hp..

 

[tkelly27]

Few things. There is boost spike and boost creep. Spike is when the turbo spools goes above where you want it, then settles down to where you want it. Creep is where it begins to climb as rev's climb. Creep can easily combated with the right foot. If you've ported it that much you should be ok with creep.

Spike can be altered with your boost controller (manual and electronic) by changing bleed off size, position, and other things. Search for boost spike to read more.

The other thing is, I can't see what you are making hurting. The only thing it could do is A. not work at all and have the WG stay shut, but you'll know that right away, or B. give too much mechanical advantage to the flapper door, letting it open against the spring under the pressure of the exhaust alone which won't let you make the boost you want to make. Either way, no real problems, just back to the drawing board : D

 

[dsm-onster]

Peepers Mod. Having more throw on my small 16g helped my creep issues. Seams not to work with td05h turbos with larger compressor wheels.

Sounds like to me too that you're talking about boost spike. Boost spike cannot be cured by doing things that cure boost creep.

 

[Join]

Peepers Mod. Having more throw on my small 16g helped my creep issues. Seams not to work with td05h turbos with larger compressor wheels.

Thanks for your input. I might try this when I get the car running. I have already come across that thread earlier. My hack is all external work. A new idea is to fasten the pivot pin with the help of the actuator bolts itself, so that I don't have to weld it in or tap it into the housing.

Sounds like to me too that you're talking about boost spike. Boost spike cannot be cured by doing things that cure boost creep.

It's not a spike, it just come on really quick, and stick there! It's a matter of putting a little hard on the throttle below where the S16G is able to boost, and when it does start to boost she is not able to let go quick enough! But some training will solve that I believe. But, she doesn't like the car to spin the wheels in third gear when the roads are wet when you punch it..

I don't currently have the boost creep problem, but by changing my exhaust to my new Tanabe 3" I might get it? I want to know whats happening, and be able to solve it.

OT: The 2step mbc will give me a stock option and a full power option. If I choose to install meth injection, I can have a full-power disable when the low wiperfluid-switch come on. To be on the safe side of things. Ideas, ideas, ideas..

But basically, I don't want it to creep when running on stock boost. At 15psi it was creeping to 17psi @redline 7500rpms before.

Thanks