[markd03]

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

 

[turbotbirds]

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

Bad ass setup also!!

 

[markd03]

what should i be runnin for wg?

 

[slow8.0]

them are small turbine housings so your going to need more wastegate. And thats only a bandaid.

 

[turbo chicken]

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.

 

[markd03]

thanks for the help....

 

[enginerd]

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.