Which wastegate option should I get?

[96whgsx]

Well, at the end of the month, I plan to order a o2 elim full turbo-back from RNR and I have a question. What I'm planning is getting this for my 14b then later on, I'm planning on going much bigger, most likely a gt30r with the external wastegate on the SBR manifold, re-routed back into the exhaust. Now, which option should I get with the turbo back? I'm thinking the externally dumped one but I live in CA. If I decide to go with the the re-routed one, I'd have a problem later on with exhaust gasses coming out. So what I thought of doing in this scenerio is to make a metal plate in the shape of the o2 housing gasket except with one hole where the exhaust gasses go to the downpipe. What do you guys think I should do? Thanks.

 

[MNGSX]

It all depends on how you will set the boost on the big turbo...

I run high boost always and my internal gated PTE SCM61 is just fine with a internal gate. Its in the Gt35R ballpark size wise.

The only time a external is really needed for most people is when running low boost on the street with a big tubo....

IMHO.. If you are going to run a big turbo with low boost.. why run a big turbo.. like lag or something...

Therefore port your 2g exhaust manifold to 7cm2 and later Just get the internally gated AGP GT30R they build on a bullseye turbine housing..

My car is getting extremely fast and I never bought any of the super expensive parts.

Some of my stuff is big $ new but I got it 1 season old on a racing parts trader..
SX pump and reg for example... My 1680s were from fiveomotorsports and I turned them down to fit myself... Added -10 fittings tapped into a anodized stock rail.. etc.. Its all done right but not at great expense.

When it came down to the turbo system I looked at this car and thought...Hey look

http://www.buschurracing.com/Conquest1.html

BR ported 2G exhaust manifold
BR650(PTE) internally gated turbocharger

A ported 2g mani and a PTE turbo should work good for me too..

I would take the money and time you would have spent monkeying with the wastegate dump and put it into DSM link or AEM and tuning that thing..

 

[96whgsx]

I'm not sure if this makes too much of a difference but around here I can only get 91 octane gas. How much psi are you running? Have you ever experieced boost creep? At what set psi? Thanks.

 

[MNGSX]

In that case drop your compression ratio to that of a 1g or so... 7.8:1 maybe even 7.5:1...

You wont get creep on the AGP..

I dont get it on mine either but I have never ran under 25lbs..

 

[96whgsx]

Thanks for your input, I really do appreciate it, now I'm really considering an internal w/g. Unfortunately, I have Weisco's 9.3:1 pistons already installed in my 6 bolt, so I'm not going to replace them anytime soon.

Just curious but what would be your opinion on this:
http://www.bullseye-power.com/product_info.php?cPath=37&products_id=121

Also, I've been reading some posts an this turbine housing and I was wondering if RNR's turbo-back will bolt up to this or would I have to get a special flange?

Thanks.

 

[MNGSX]

Thanks for your input, I really do appreciate it, now I'm really considering an internal w/g. Unfortunately, I have Weisco's 9.3:1 pistons already installed in my 6 bolt, so I'm not going to replace them anytime soon.

Just curious but what would be your opinion on this:
http://www.bullseye-power.com/product_info.php?cPath=37&products_id=121

Also, I've been reading some posts an this turbine housing and I was wondering if RNR's turbo-back will bolt up to this or would I have to get a special flange?

Thanks.

That is a high CR... Look for E85 stations around your area.. Thats about the right static CR for running boost on the mostly alcohol mix.... Also consider a SCE ICS titan gasket in a much thicker size than normal..

It will bolt up but unless you have some high octane gas I think you will have to run it on lower boost. Internal gates cant run super low boost accurately...

My boost control at a PSI that justifies having a turbo that big on up is just fine with the internal gate...

 

[96whgsx]

Whoops, I meant 8.3:1, not 9.3:1. Sorry. And thanks for your help, I really appreciate that you can give insight on this subject.