Anyone here running theirs this way?

 

I am, but on a dsm. I don't see why it wouldn't apply to you unless its twinscroll then I don't know

 

Do you mean welding the WG flapper valve shut? Why would you consider doing this unless you were running a second(external) gate?

 

now a days, instead of doing this, you can just get an o2 dump... same thing youre looking for (i hope) and no welding!!!

 

I mean no wastegate at all an e-85 and a big fmic.

 

why would you do that? do you understand the concept / mechanics of the wastegate?

 

I do which is why I asked this, I know why you should not do it but that is not the ??

Nevermind the ?? I thought people would understand what I was asking about, I don't want to turn this in to another one of "those" Threads.

 

no im not trying to turn it into one of "those" threads, im just trying to understand your logic and see if youre knowledgeable of the way the EVO operates. what are you looking to gain by welding your wg flapper closed?

 

I have ran this setup on a 240sx and it made difference a running an external wg.

 

O.K., so you do mean running w/o a wastegate altogether. You propose to weld shut the WG flapper valve, but not because you intend to run a remote(external) gate. Rather you don't want to run any wastegate whatsoever.

Just because you or anyone else has tried it on another car doesn't mean that it is wise to try it on your Evo. Incidentally, is your car an Evo X?

In the end this may turn into, "one of those threads". Why? Because your question just happens to be, "one of those questions."

 

I don't think that you'll find anyone on this board that is running their Evo totally gateless, at least, not with a stock turbo setup. Maybe that individual does exist but I can't recall having read about it. There are some who have welded their flappers shut, but as I recall all of those did it because they had adapted a remote(external) gate.

Personally, I have owned two turbocharged automobiles that were totally non-gated. So, I've been there myself. I am just not aware of anyone having tried it succesfully on a stock turboed Evo. So, I am not saying that it is impossible. Hell, anything is possible. I am just wondering for what particular reason you wish to run your Evo gateless.

 

To increase spool and be able to run/hold more boost. I'm sure many people have tried it but for some reason no one speaks abt it. It will be a PITA as a daily driven car though...

 

People have run 38 PSI(maybe more?) on the 16G while retaining a functional internal(integral) gate. So, it is not necessary to disable the factory turbine bypass system to achieve relatively high peak boost levels with these little Mitsu turbos.

 

As far as spoolup is concerned with the 16G's you can go to a TME TiAl turbine wheel and adjust preload on the stock WGA to where the turbo will hit 22-24 PSI by 2700-2800 RPM. So, you can get these turbos to spool while still maintaining proper WG function.

If you get too quick of a spoolup you will run into some driveability issues(i.e. compressor surge etc.) as well as longevity concerns due to excessive shaft speeds as well as the compressor slam. That's another thing... do you plan to disable the compressor side diverter valve as well? You could seal that off too.

Then there is the issue of higher EGT's, detonation, preigniton and all that. Which leads us to the knock resistance of the fuel you'll be running. You say it'll be E-85. Most tunes that I've seen with the stock type turbos on E-85 are running low 30ish boost. If you close off the WG, you'll be reaching boost levels higher than the low thirties easily I'll bet.

You might as well weld the head to block because otherwise you'd need to o-ring and fire-ring that longblock.

 

Yes. I can't get more than 32psi and I have a stock valve spring from an evo 8 in my wg right now.

I am trying to get the most from a stock set up for just a few passes at the strip, This is by no means a daily driver.

Keep in mind running e-85 is alcohol so the intrcooling effect will almost allow for this.

I want 36-40 psi spikes and to hold 33ish.