Evo 3 Turbo

[gsxeclipse97]

Ok i searched and i couldn't find anything on a couple of questions that i have.. I know that i need certain things to run this turbo.

question 1 I have gotten mixed feelings about getting the 34mm flapper on the evo3 so i would like some more feed back on that.

question 2 Porting i was reading about porting and have gotten mixed feeling on that also. Some say why port before the turbine and slow down the exhaust there and others say to port there and the outlet of the turbine. I can see how both have good arguments but if you have a 7cm collector on the exhaut manifold i would think that you would be ok.

question 3 Porting the runners on the exaust manifold. I can see this being good for topend but will it compromise the exhaust manifold or will it be ok. I will be using a 2g manifold with this turbo.

thats all i can think of right at this moment. Oh.. yes and I was reading about the evo thing that was on here last night and saw that it said that you can only use the 98-99 eclipse ecu, but i also saw that it was 94-99 I will also be getting a logger with this as well as an evo 9 fp and will look into a rewire kit as well.

 

[gsxeclipse97]

Well i need some responses here because i will be doing this swap fairly soon and i am going to order the turbo in the next couple of days so if anyone has any anwsers to this these questions that would be great.

 

[oldman420]

Porting is always good, just don't take to much. Really porting for newbs is all about gasket matching, make sure you don't take more than the the diameter of the gasket. I say porting is good especially on a E3 because on stock injectors these things are notorious for creep, helps the flow of exhaust to not create to much turbulance. So port the mani and the exhaust side of the turbo to match the gaskets and your looking good.

 

[1997turbodsm]

I say get the bigger flapper door also. I had the E3 on a 1997 gst and it CREEPED. so i went external gated. My friend had the E3 on a 1g talon and he had the bigger flapped. His didn't Creep at all. So i say get the bigger flapper.

 

[peypey's ride]

I did both and it really helped with my creeping!(34mm flapper and ported tubine housing)

 

[gsxeclipse97]

Ok well the manifold is ported for 7cm currently that im going to get because mine is cracked but the runners are not so should i get thouse ported as well or just leave them alone so that the exhaust still flows at a high speed.

 

[gsxeclipse97]

also how much boost are you running. I plan on running 18-22 at some point in time so will the flapper being larger cause any problems further down the road?

 

[oldman420]

If your profile is right you dont have any fuel mods so i would turn it passed 13psi. Yah port the runners and get the mani welded if it's still out.

 

[gsxeclipse97]

Yeah its right but im not going to run 18-22 on stock fuel im going to buy a evo9 fuel pump as well and not sure on the injector size yet. im only looking for 300-350 to the wheels so nothing major.

 

[spyderturbo007]

Personally, I'm against the larger flapper unless you want to run low boost all the time. Think of it this way, if you are running low boost you need to bypass more exhaust gas around the turbine wheel than you do if you're running high boost, right? In that case, the larger flapper is a great idea because it keeps you from creeping.

Now imagine you are trying to run higher boost and have a larger flapper. Exhaust gas creates pressure on the inside of the flapper while the flapper is closed. The force exerted by the exhaust gas on the flapper is proportional to the area of the flapper. So, the larger the flapper, the higher the force applied, and the easier it's going to be to force the flapper open.

This results in the flapper blowing open during high boost applications and bleeding off all your boost. A better choice would be to port the turbine housing and allow the flapper to open further. This way, you can have the best of both worlds.

 

[95CarbonEclipse]

...especially on a E3 because on stock injectors these things are notorious for creep...

Injectors have nothing to do with boost creep.

OP'r... listen to Syderturbo007

 

[eclipseGSTud]

+1 for the 31mm wastegate flapper over the 34mm. Port the turbo and wastegate opening so the flapper can open as close to 90 degrees as possible. Are you going to upgrade your o2 housing? Porting your stock o2 housing or upgrading to a bigger o2 housing will help minimize any chances of boost creep.

 

[oldman420]

Your not listening carbon, to quik to jump to conclusion and point fingers. I'm simply saying creep would be really hard on his engine with stock injectors, especially if he's running higher boost levels than stock already.

 

[95CarbonEclipse]

Your not listening carbon, to quik to jump to conclusion and point fingers. I'm simply saying creep would be really hard on his engine with stock injectors, especially if he's running higher boost levels than stock already.

I apologize, but what you said didn't read how you just explained it. You are correct though that boost creep on stock injectors is much more hazardous then if you had larger injectors.

 

[gsxeclipse97]

I plan on porting the o2 housing and i'll keep the 31mm flapper in case because i do plan on running higher boost do you have any pictures of how that would look? For the waste gate area and how that would look?

 

[gsxeclipse97]

Ok i see what you are saying now.. that spot on the turob that keeps the waste gate flapper from opening all the way i remember that from my t25. So Port the inlet and the outside of the waste gate area and run the 31mm flapper. Well Im pulling the head on thursday and getting the oil leak fixed as well so im will keep everyone posted on how the project turns out.