Manifold Upgrade

[ian101]

Looking to make a decent upgrade but still a little concerned about the increase of power and the effect it will have on my car. Is an external wastegate going to be needed / necessary? Do you guys see any problems I may encounter or should look out for.

Cobb SRI

Cobb FMIC

Cobb TIP

Cobb AP Stage 2

TurboXS TBE

APEXi N1 Muffler

Cusco Evo 8 Catch Can

NGK Step Colder Spark Plugs

TurboSmart BOV

 

[mr_mazda329]

I would get an External wastegate . You will start to experience some boost creep with out. TiaL makes good ones. I would try to follw Yoichi's build thread on the M a z d a Sp e e d F o r u m s . o r g

 

[Sport6]

I would not get an external wastegate unless you are getting a bigger turbo. I have not heard of boost creep in these cars on stock turbos.

 

[ian101]

Yeah thats what I've been hearing, but the stock tranny and clutch shouldnt have any problems? Its my daily driver but I dont gun it front light to light. When I hit up circuits or drags thats different. I dont plan on getting a BIGGER turbo... I just wasnt sure about the stock internals and what I could and shouldnt do.

 

[mr_mazda329]

The stock internals on this car really do suck. I would stay below 18psi

 

[ian101]

The stock internals on this car really do suck. I would stay below 18psi

To late, pushing 21constant. Once you upgrade your FMIC your ok.

 

[mzspd3soffl]

I would not get an external wastegate unless you are getting a bigger turbo. I have not heard of boost creep in these cars on stock turbos.

i have boost creeep on a cold night. Resulting in boost cut/Fuel cut. Very much likely

 

[mr_mazda329]

Boost creep is possible with this stock turbo. With all the breather mods and now a upgraded manifold...it will most likely happen.

 

[ian101]

Boost creep is possible with this stock turbo. With all the breather mods and now a upgraded manifold...it will most likely happen.

Can you elaborate, boost creep...

 

[mr_mazda329]

Boost creep is rising boost due to not enough exhaust bypassing the housing. For example, you're set for 15 psi, and when you floor it, you get a quick rise to 15 or 16 psi. But then as rpm's climb, the boost creeps higher and higher: 16, 17, 18, 19, etc. Enlargening the wastegate hole is one cure for boost creep.

The boost creeps higher at high rpm's because there's too much exhaust flow for the wastegate hole to bypass.