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Discussion Starter #1
rookie needs some help....
this truck is 99% street time, olds 455 with tt holset hx35, e85

my wastegates seemed to working fine when i was running 15 lbs but i now am going to pump gas and trying to get down to 8 lbs. with the 7-9 lb spring (i did test em) they cannot get it below 12 lbs.

gates too small?

poor header design?

thanks in advance



 

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Most likely the gates are too small. I think the delta gates are 35 or 38mm?

Bad ass setup also!!
 

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The wastegate's are mounted poorly. Pressure is the only reason anything is passing through them, you need a natural flow path for the gates to work effectively. I bet you would still get 12 psi with no spring once it comes on boost.
 

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I ran twin deltagates on my 331, with a Eboost controller. They held rock solid boost from 10-28psi. Put about 1K crank horsepower thru them. Couldn't get them lower than 10psi though.
 
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