woohoo reduced my spool to 4100! - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 06-17-2008, 10:05 PM   #1
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Default woohoo reduced my spool to 4100!

Well rember how I could barly tap 13 psi in 3rd, at like 5 k rpm?

Well it seems the wastegate I used had too weak a spring and was opening the wastegate!

So I sorta riged a 19 lb spring from home depot on there and now it spools so much better!

I actually hit 13 psi in 2ed gear now haha.

woot.
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Old 06-17-2008, 10:18 PM   #2
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what you should have sorta rigged was a boost solenoid....
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Old 06-17-2008, 10:24 PM   #3
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Yea pretty much. But at least you're getting the boost you wanted
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Old 06-17-2008, 10:28 PM   #4
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put a picture, id like to see how you mounted the spring, i seem to be having the same problem

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Old 06-18-2008, 12:39 AM   #5
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nono, the backpressure created from the exhaust spinning the turbine would push the wastegate valve open, thus the exhaust gas would bypass the turbine when the compressor created anyhting over 6 psi of boost.

This was because I used a wastegate actuator from a smaller turbo, the spring in it is way too weak to hold back the exhaust backpressure.

The car is like a whole new car now, much improved.

I already have EBC, and I have it set just the way you said, brain, in another thread. (I got the spool down to 4k RPM now.. hehe)
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