Bought a B6T Turnkey!

[bhearts]

2" is just what is known to work with a b6t that has an rhb5 vj14 or 11 turbine. If you go bigger, especially without a cat, it'll boost creep. The cause is the rhb5 vj14 or 11 wastegate size is too small. Porting helps and aftermarket downpipe helps, but the ultimate cure is more wastegate flow capability. An external gate or a turbo with a larger internal gate will fix the problem. When these engines boost creep past 16psi with the stock turbo you are asking for trouble. Look forward to melted pistons by the valve reliefs or a wasted turbo.

Cause lean, or cause inefficiency?

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[Advancedynamix]

Is there a formula for this. Certain minimum size for set amount of horsepower. Or only if you're internally gated?

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2" is just what is known to work with a b6t that has an rhb5 vj14 or 11 turbine. If you go bigger, especially without a cat, it'll boost creep. The cause is the rhb5 vj14 or 11 wastegate size is too small. Porting helps and aftermarket downpipe helps, but the ultimate cure is more wastegate flow capability. An external gate or a turbo with a larger internal gate will fix the problem. When these engines boost creep past 16psi with the stock turbo you are asking for trouble. Look forward to melted pistons by the valve reliefs or a wasted turbo.

[mikemounlio]

I have read the posts saying others get boost creep by just going to a cat back! I like the fender exit tho. Just have to pay attention when I drive.

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[Advancedynamix]

Full exhaust! How about a 3" straight pipe? Exhaust is wide open right now

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By full exhaust I meant a complete exhaust system with muffler, resonator and cat. Preferably a 2" diameter.

[Rocketman]

With the exhaust that short, you're not really going to be able to tame the boost levels. Even with porting.

Nice car though!

[bhearts]

It needs chocked down to at least 2 inch at some point . This will be an on going issue until you do that . Anything over 16 is taking like from that turbo and you have most likely already cracked the manifold . Sorry for the bad news..

Is there a formula for this. Certain minimum size for set amount of horsepower. Or only if you're internally gated?

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[Advancedynamix]

Rob is right.

[shadetree]

It needs chocked down to at least 2 inch at some point . This will be an on going issue until you do that . Anything over 16 is taking like from that turbo and you have most likely already cracked the manifold . Sorry for the bad news..

[mikemounlio]

Full exhaust! How about a 3" straight pipe? Exhaust is wide open right now

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[Advancedynamix]

No. I know the kit that's in it comes with 3 different nozzles. He might have put a bigger one on it by mistake. Either way I need to raise the boost switch psi and look at a new nozzle

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All 3 sizes will be too big. You'll need to special order the smallest size they make. The water meth will make the boost creep even worse, so keep that in mind. Porting the wastegate will help, but you'll ultimately want a full exhaust to stop the creep issue until you can get a better turbo or an external gate.

[mikemounlio]

In an effort to turn down the boost i have found out that the waste gate must be stock. It will hold boost until the upper rpm then creeps hard and fast to around 20. It doesnt matter what i set the MBC to. At full in it still creeps to 20. The 3" exhaust is just a bit big i guess. I will port out one of my other turbos and before race season start swap them out. I want to limit the boost to 16 and have little to no creep.

I just want the turbo to last a while! I have had my fun now its time to cool it off a bit.

[mikemounlio]

The exhaust is fine. Down low in 1-3 it's loud if the passenger window is down. Not to loud but close. On the road and moving you can keep it nearly quite. Makes it sound like a MI or exhaust leak ish. I like it tho. When I get on it it comes to life. Plus it's a good conversation starter. Also a good WTF is that-WTF is in that car looks

[bhearts]

How's the exhaust though?

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[Studebaker]

I need that Studebaker in the background of post 77.

[bhearts]

good ol hobbs switches. they make adjustable pressure ones you might look in to. so you can play with where it comes on at. i like some of the options that methanol injection kits have these days. one controller can inject based on fuel injector duty cycle. others can inject based on boost pressure. on the controller you select when you want to start spraying, and when you want to stop. so like on at 5psi, full pressure by 15, so then it scales up injection based on boost pressure.