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Wastegate poll - Turbo V8 experience required

 
Old 12-09-2015, 08:32 PM
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Default Wastegate poll - Turbo V8 experience required

Hi there, I would like to collect some sample data about wastegate selection and the aftermaths.

Have you put together a Turbo V8 in the last ten years?


Was this setup using 7 to 15psi of boost pressure? More?


When you purchased the wastegate spring for that boost pressure, did it fail to reach the rated boost pressure?


What was your solution for adjusting the boost pressure?


Could you have saved any time or money by knowing in advance anything related to exhaust gas pressure ratio, or "drive pressure" ratio of your combination? If so, what was it.

Thank you
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Old 12-09-2015, 08:55 PM
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Ugh.…
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Old 12-10-2015, 12:04 AM
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This is not going to go well but I just drank a bunch of coffee and will respond.

Yes

Yes, up to 20psi.

Yes but it was close.

Pressed a couple buttons on the controller and called it good.

No not really but after researching its effects it prompted me to change my turbo to a more efficient free flowing turbine wheel to reduce back pressure.
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Old 12-10-2015, 05:25 AM
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twin tial 38mm wastegates. I've run 6-10 psi springs, actual boost reading at the map sensor is within 1 psi of rated spring pressure.
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Old 12-10-2015, 10:28 PM
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Yes

Both

8 pound spring yielded 9psi manifold pressure on gate. (twin China MVS40's)

Home made boost control

Nope. My set up (100% fabed by me) worked just as planned, hell even better really!
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Old 12-10-2015, 10:35 PM
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Originally Posted by SPRAYED 01 View Post
This is not going to go well but I just drank a bunch of coffee and will respond.

Yes

Yes, up to 20psi.

Yes but it was close.

Pressed a couple buttons on the controller and called it good.

No not really .
Same..
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Old 12-10-2015, 10:39 PM
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I can't wait to see what conclusions the op comes up with from all this.
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Old 12-11-2015, 04:10 PM
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there is so much to this.... size crossover, placement of gates ect. I run twin precision 44s with 3 inch crossover, 88mm midframe on 20+ psi. and use Boost leash controller. my 8 psi spring seeing 12.8...
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Old 12-11-2015, 04:16 PM
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Old 12-11-2015, 06:36 PM
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Originally Posted by scottywheels View Post
That's one pretty Sumbitch right there!
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Old 12-11-2015, 08:29 PM
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Originally Posted by 3 window View Post
That's one pretty Sumbitch right there!
Thanks buddy
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Old 12-14-2015, 07:52 PM
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Originally Posted by scottywheels View Post
there is so much to this.... size crossover, placement of gates ect. I run twin precision 44s with 3 inch crossover, 88mm midframe on 20+ psi. and use Boost leash controller. my 8 psi spring seeing 12.8...
Did you have any trouble with your gates due to exhaust gas pressure? was the boost controller able to overcome your issues? Could you have saved any money or time by doing calculations beforehand to account for excessive pressure in the exhaust system?
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Old 12-14-2015, 08:08 PM
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Twin tial 38's. True divided 2.25" hotside on 5.3L with a 1.05A/R T4 GT45.

5.xx springs netted me around 6.00PSI
10.XX springs I am getting bang on 10.00

I adjust using a innovate SCG-1

Also I reference my wastegates from the turbo outlet and my gauge reads from the intake.

Jay
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