dude

Rev, I was no way trying to knock you at all. In fact I said I take back what I said in a post above. I just got pissed cause all you said was it won't work. Well why? What research did you do and test results did you come up with?

Now that I have seen some of the research behind your reasoning, I am questioning along the same lines as you. I agree with you in the sense this could reduce spool but you don't have any data to backup what you are saying. I know others that build twin scroll manifolds told you that but did we test it? There are a lot of things that hypothetically should not work but do for some reason. I want to try both versions but I have no idea how you did what you did.

So, I am going to try out MAP's version with a before and after dyno plot and spool characteristics with my 2.3l BBK full turbo.

Also, I think it's great a new shop is building parts for the EVO. I don't know what they did before. Hell, they can be the most respected shop on the East Coast, I don't know. So I will give them a chance, they seem to have a lot of nice products and do good work. This helps new idea's come into the community and promotes better and innovative new solutions.

So let's work together and come up with results we can quantify. Your design might be better but if MAP's design is only worse by 100 RPM in spool then what's the big deal if you have better control of boost and in my case eliminate boost creep.

~Zach

I have a 2.3l BBK Full setup and a BR full vband exhaust with a BR o2 housing. The exhaust is setup correct. The BBK is just running out of wastegate. I can hold 15 psi until about 5k then it ramps up to 24 psi by redline on wastegate only! I would say that is a boost creep issue. I did not have this issue on the stock EVO9 turbo.

Why would you run lower then stock boost? your 24psi is most likely a snowball effect.. And why not run 24psi anyway?? I am sure you did not install the turbo to make the car slower

How would this work? No exhaust gas would enter the wastegate tube then. You would need to weld on a wastegate to the manifold not the downpipe, if you weld the wastegate shut on the stock hotside.

It makes it really hard to dial in boost, plus on cold days I don't want to run 24 psi, I don't need to work the turbo or the motor that much. I would like to be able to run 19psi or higher consistently without any problems.

Plus, boost creep is a problem of running out of wastegate. Why mask it, I want to fix the problem.

~Z

I totally glued to this thread... please keep it coming.. I am about to be in the same boat with Red turbo and complete build and definitely do not want to miss a beat if there is a better part/theory out there.

no making any problems, but this is where I think common sense comes into play.. at 19psi the stock turbo is probably the better choice.. Also I have driven a BBK car at 18psi with no creep.. Might want to check that wg tension.. I have always been a big fan of the factory 10.5 exhaust and it's wg abilities.

Tension is stock and was told by CBRD to never touch it. It must only ever be 2.5 turns.

On a 2.0 liter the BBK full does not creep at all. Have you driven in a BBK full 2.3 car?

Did you notice I have a 2.3?

My thoughts exactly, even with your wastegate mounted to the housing the discharge is still recessed into the housing allowing the wastegate gases from both scrolls to combine pre-wastegate as in our configuration. And what do you mean by "Your way is open and undivided causing a leak on both sides?" As far as I can see both designs allow the wastegate gases to combine pre-wastegate, and what exactly would be leaking?

In any case, we will have some before and after results in the very near future. We have our original prototype on a shop car here, and although no loss in regards to spool up was perceived I have a feeling you won't take my word for it

Also will have some results from 9sec9 himself as he believes our setup is worthy enough to go on his FP red car.

I love when it comes to these small arguments between a shop/person and a engineer lol.

Lag is overrated, you tell us how much and maybe that will help, IMO anywhere between 100-300 rpm's in loss of spool is very unnoticeable next to the gains that are produced.

I'd like to see some dyno graphs until then ill hold off on my $800 purchase lol.

Will be up shortly

I was just wondering how you remove the flapper? I have looked at it but I don't see and easy way to remove it- do you have any suggestions? Thanks- John