sounds good

 

thank you, not a great video though... will have better sounding ones later

 

Props for the DIY, but you have a flawed design. You have essentially made your turbo a single scroll from a twin.

Looks like it doesn't hold boost very well.


If you really wanted to do it, you should have kept the manifold the same, removed the internal wg and flapper, then fabbed this up from the o2 housing.

It would have been a lot easier. Buy a EPM o2 dump, remove the WG, cut the dumptube weld on the wg flange, bolt it up, then weld a new dumptube.

You really should redo this, like scott said, this is hurting efficiency/power. I could explain in greater detail if nec.

 

i no that was the easier way to do it but didnt like it that way... and i no its a sinal scroll now but have a new one being made that the Y pipe will be completey seperated till the wg so it will still be a true twin scrll again... and actually i havent noticed it being any laggier and that vid doesnt show boost well it actually holds very well

 

All of you saying he turned this into a single scroll are wrong. The only flaw to this was when he y'd it to the wastegate he should have put a divider to prevent a leak between the two ports. It will create a very little effect and probably not even noticeable. What he did is the same as what DNP does to their twin scroll manifold and it seems to work just fine.

 

thanks rev, you gottacheck it out its sickkkkkk!! and i dont notice any more lag or any loss in performance at all and it hold boost crazyyyyyy hold 27lbs all day now

 

I didn't say it is now a single scroll. I said essentially it is. Obvious the turbine has two seperate volutes leading to the turbine wheel, but the effect of keeping them completely seperated is greatly diminished. Think about it, do you really believe that with all of the pressure going on in there before the wastegate opens that a ton of gas isn't coming into that y pipe from cylinders 1-4 and going into 2-3 and vice versa? Its all mixing now. We obviously can't be sure what is actually going on inside of the manifold but one of the purposes of twin scroll technology is to stop exhaust from reverting back into other cylinders like it can on a single scroll during valve overlap, which this mod has essentially allowed to be possible, which in my book greatly outweighs any benefits that the ext gate has allowed.

I don't mean to rain on your parade or be a pessimist, but in order to prevent the spread of misinformation, it should be known that you are actually not holding 27psi all day. Its not possible, the turbo isn't capable of that even with the wastegate completely sealed off.

 

If spool up is decreased and boost is being held then we can conclude that the problem is marginal. Also to add to the turbo not being able to hold 27psi I am going to have to disagree as I hold a steady 26psi till redline.

 

I think its really cool and the kid seams to understand that he missed a few things on the first setup. Let him make the second one and fine tune the setup. I'm willing to bet that few of you could even fabricate something like this, let alone do it perfect on the first try.

Innovation is how we move forward.

 

Agreed^^,,,,,you should post up a vid of you doin a pull threw the gears to see how well it holds boost

 

yeah trust me its holding 27-26 strong but i just lowered it for safety reasons! and spool is decreased so little its barely noticeable and the cinstant holding of boost is making up for that!! and the seperation in the Y pipe is small there is very little room for mixing...

and yes im going to be making more videos when i get my camera, im at school and forgot my camera home so gotta wait

 

FYI I can't see the pics of this one cause I am at work, however when you refab the new one make sure you pay attention to fluid dynamics because if you have 2 half moons flowing into the wastegate you are essentially cutting the velocity of air flowing into the wastegate big time and in turn the airflow then becomes surface tension, and may then boost creep as it will not have enough velocity to purge the exhaust gas. How can I be sure... I just got done making an O2 dump last weekend where we made a half moon pipe welded to the side of the downpipe and it could not expell enough of the gasses and I got mad boost creep...

 

they werent two half moons... they were two 1 inch pipes which provides enough flow and then they were opened even further so when they met they created the 38mm opening on the wastegate

 

Gotcha, just trying to save you some headache!

 

Lets see a datalog of 26psi at 7600rpm. Until then......

Also, you said "If spool up is decreased and boost is being held then we can conclude that the problem is marginal." There is no evidence as of yet that he has either decreased spool up or is holding boost well. If you look at one of the videos he posted, he spikes 24psi, instantly drops to 18 psi, then starts climbing to 20+.