See right now I am running open DP which is HORRIBLE for creep...so im expecting this to get better once I have my car to the exhaust shop to mod the inlet on the midpipe for the new downpipe.

 

It has to do with manifold design / turbo size / psi and not so much with efficiency. My LOG inlinepro manifold creeps at low boost levels / very cold days and I highly doubt it is as efficient as a EL manifold...

 

manifold design is the problem, not efficiency. put a 2nd gate on and it will all go away.

we did a supra a while back that would make 30psi with a 7psi spring lol. i forget what manifold it had, but the WG design was just not good. added a 2nd gate to it, and it would hold boost just fine.

rpm has a lot to do with creep as well.

 

OK, so since everything(air) is moving along it's going through the turbo instead of out the WG correct cause it's too small.

So possible fixes would be larger WG like a tial 44 to let more are out.
A high end programable boost guage that can better control the boost?
A highly restrictive exhaust to slow the turbo down and kill power
A stronger wg spring.

My tuner fixed the problem by have the emanage control the boost pressure via the MAC cable, so I am assuming he can regulate the problems buy controlling injectors and timing, is this correct? I have read this can be done with the AEM EMS as well.

Also why does this happen at the higher RPMs, car seems fine under 7k?

 

exhaust velocity increases as does volume...so its more mass flow for the turbine wheel to ingest and more work for the wastegate. Thats why high rpms youll see creep ( when trying to keep boost below 10psi or so ).

 

I have figured out a few more things, it seems you can put a bigger wg on and it should not hit the hood, you need some sort of flange. Anyone know where i can get one?

 

Larger wastegate will help

A better boost controller; only to a point -- the flaw is still the manifold so that can only help so much

Restrictive exhaust will work

Stronger wastegate spring will reduce your max creep pressure but you'll still creep (or if you have bad creep, it won't do anything).

 

I had a custom flange made, it placed the wastegate on a slight angle so it doesn't exceed the valve cover height (and thus hit the hood).

 

Cool thanks man, I would also recommend running your boost through your EMS. I think it's a bit more time for the tuner but they may be able to manipulate more things.

I think a good boost controller that allows you to change the gain setting per or rpm psi would help a lot, anyone know of a good one. I have been told the apexi is a good. Any others I should consider. Mine now you can have just one gain setting, I need to be able to add multiple values.

 

I wonder if I should do dual 44mm W/G,s I dont know if there is room,although two 38mm is = to 76mm worth of W/G, unless it isnt that simple?