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MidPipe Question

Old 01-07-19, 06:06 PM
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MidPipe Question

So I'm wondering whether or not you can safely run a midpipe with the following modifications:

Mild Streetport
Tuned PFC
Apexi Intake
HKS DP
HKS Ti CatBack
Stock Turbo/Wastegate
Denso TT Fuel Pump
Injectors 720x1200

I've seen a lot of conflicting information. I do plan on going BNRs/Ported here soon but I have a resonated mid pipe in my garage and want to see what it's like on the car.

Last edited by NanD; 01-07-19 at 06:40 PM. Reason: Forgot to include intake*
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Old 01-07-19, 06:30 PM
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You will very possibly see boost creep without the waste gate being ported. What do you have for a cat/mid pipe now? Maybe if you have stock intake/intercooler that will be enough to keep the boost in check. Is your boost level pretty solid now?

This really is one of those questions that nobody can straight up answer yes/no to, the answer is a definite "maybe".
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Old 01-07-19, 06:40 PM
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Originally Posted by Tom93R1 View Post
You will very possibly see boost creep without the waste gate being ported. What do you have for a cat/mid pipe now? Maybe if you have stock intake/intercooler that will be enough to keep the boost in check. Is your boost level pretty solid now?

This really is one of those questions that nobody can straight up answer yes/no to, the answer is a definite "maybe".
My mistake. Forgot to include apexi intake in there. Stock intercooler at the moment. My boost is quite solid at 10psi right now.

Edit: To answer your other question, currently have the stock cat.

Last edited by NanD; 01-07-19 at 06:46 PM.
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Old 01-07-19, 10:49 PM
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I think it'll be fine. You'll be running more than 10 psi thought. When I took mine off, i saw between 12-14.
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Old 01-08-19, 04:32 AM
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Originally Posted by oppa637 View Post
I think it'll be fine. You'll be running more than 10 psi thought. When I took mine off, i saw between 12-14.
Butt weight....if he has a "tuned PFC" presumably to 10 psi and the boost increases to 12 or 14, he's not safe is he?


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Old 01-08-19, 10:33 AM
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Again, it depends. The tuner could have set up those cells in the PowerFC.

If you hit higher than normal boost for a second you won't hurt anything. You would really need an AF gauge to make sure the levels are good. If you just want to try it out to see how it sounds (and SMELLS) you could easily drive around part throttle with it. Sustained high boost pulls is what can kill an untuned engine.

The stock main cat is the most restrictive part of the system, opening that up opens the engine up wide.

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Old 01-08-19, 11:34 AM
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Originally Posted by DaleClark View Post
Again, it depends. The tuner could have set up those cells in the PowerFC.

If you hit higher than normal boost for a second you won't hurt anything. You would really need an AF gauge to make sure the levels are good. If you just want to try it out to see how it sounds (and SMELLS) you could easily drive around part throttle with it. Sustained high boost pulls is what can kill an untuned engine.

The stock main cat is the most restrictive part of the system, opening that up opens the engine up wide.

Dale
I would get another tune immediately after and will definitely get an AF gauge now that you've mentioned it.

I don't plan on really racing it or taking it to the track until I go BNR either.

I appreciate your response.Thank you.
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Old 01-08-19, 03:38 PM
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When I removed the cat and and went with a resonated midpipe , there was a noticable difference in A/F ratios after the change and I ended up retuning it
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Old 01-09-19, 11:17 AM
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Full exhaust on any twin turbo car has the potential to boost creep. There is little power to be gained at that level. I'd leave the cat or wait until you are able to port the wastegate. Also, you will definitely need a retune to be safe.
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Old 01-10-19, 02:17 PM
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Originally Posted by NanD View Post
I do plan on going BNRs/Ported here soon but I have a resonated mid pipe in my garage and want to see what it's like on the car.
BNR's require a retune so might as well wait and slap that resonated MP when you get the new turbos. Kill two birds with one stone. Also get rid of the stock SMIC... It really isn't very good (as you most likely know by looking at your AIT's via the commander)
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