Replace or add another wastegate?
Replace or add another wastegate? So after a nice long day on the dyno we aere having a hell of a time trying to control the boost on my car. 408 lq4 with bullseye s480R. I currently have a Precision 46mm right in the middle of my merge pipe on a angle..
like so
We put a medium red spring in it trying to get it to stay low psi and it still would go high. With the AEM boost controller on the lowest setting spools up @ 3800 to 11psi. Holds 11psi until about 4900 then climbs to 15.79 psi @6000 rpm. oh and at 902whp
Let off at 6k... Just scary not knowing where boost is gonna be.
So now im trying to figure out if i should try to squeeze a 66mm in the spot or put another 46 on? and if i put another 46 on its going to be before the merge pipe a little so im sure that wont be good since you probably should have 1 on each pipe before the merge..
Let me know what yas think
like so
We put a medium red spring in it trying to get it to stay low psi and it still would go high. With the AEM boost controller on the lowest setting spools up @ 3800 to 11psi. Holds 11psi until about 4900 then climbs to 15.79 psi @6000 rpm. oh and at 902whp
Let off at 6k... Just scary not knowing where boost is gonna be. So now im trying to figure out if i should try to squeeze a 66mm in the spot or put another 46 on? and if i put another 46 on its going to be before the merge pipe a little so im sure that wont be good since you probably should have 1 on each pipe before the merge..
Let me know what yas think
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Staging Lane
Joined: Mar 2012
Posts: 51
Likes: 0
It'd be best if you had it in that position on the OPPOSITE side of the collector. You've got the dump on the inside radius of the turno so you're asking the exhaust, with all its velocity, to change directions dramatically. If you poke that hole on the opposite side of the collector you'd likely have much better results - you probably don't have enough pressure in the collector to really vent at that position - I have a similar issue. Further, you probably don't have an exhaust that is restrictive enough to encourage flow out the WG... so it's easier for the exhaust to go through the turbine housing vs pop out the wg hole.
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Verdad Gallardo Thanks I think I'm gonna try to run another 46 and move them to each pipe before the merge when I get home from work I'll get a picture of my pipe and circle where I'm thinking to get some opinions.
Staging Lane
Joined: Mar 2012
Posts: 51
Likes: 0
