Alright, my car was running excellent until te day I changed my exhaust system. I use to have a DX 1.5L cat to rear muffler section and it worked excellent with my setup. car neever boost creep, was always rich and was working A1. Now, I switched to a 2.5 straight with dynomax super turbo muffler and the car is crazy. It run lean from 5000 to 7000, and I realized why, the car is now boosting a 11 to 14psi ! (It was a steady 8psi before). Now, what do you suggest doing.

1. Put my dx exhaust back in place and run it that ways (I was very satisfied tho, no sound, quite quick etc...)

2. Modiffy the actuator spring or change actuator

3. modify actuator arm, (how many inch should I lenght it up)


My favorite choice would be #1, but do you think I can damage my turbo ?

Setup is on a b18b ith T25 modified turbo (don't know what mod it has, but hot and cool side aren't OEM)

Thanks

 

I would change the actuator. It is the safest, most acurate way of lowering the boost. It sounds like you have a better flowing exhaust now. I wouldn't change the exhaust. Get a new actuator.
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#2

or simply remove the actuator and put a ------- carb spring in place of it.. that will allow you to set your boost to whatever you want.

Jeff

 

Hi jeff, in the previous post you mention put a card spring? What are you talking about, I don't understand...

Thanks

 

If you install a spring with tension in the direction that the wastegate opens, you will run less boost.

 

heres a pic, spool time is normally cut in half too, we use these on all our 14b setups..