Don't put a throttle in the path of your wastegate signal. You want the wastegate to control the turbo based upon what the turbo puts out, not what you're metering into the engine with your right foot/throttle.

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Joshua

Don't put a throttle in the path of your wastegate signal. You want the wastegate to control the turbo based upon what the turbo puts out, not what you're metering into the engine with your right foot/throttle.

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Joshua

what size return line is everyone using?

anyone? i have the pump, a walbro 255lph and about to get the regulator mallory 4309. after that im gonna get it going again. i have a 3/8" from the tank to the pump. 3/8 return line was recommended on theturboforums but i think that may be excessive and wouldnt allow the regulator to give me the pressure im going to need. i was leaning tward 5/16" return line.

anyone have anything to add? would be greatly appreciated.

I bent a 3/8" line for feed, and use the stock 5/16" line for return.

Lou

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Home of Slant6-powered fun machines since 1988

The return line is generally the same size as the supply so that the regulator has control over the fuel pressure rather than the restrictions in the plumbing. The regulator is closed until the pressure is at the set point and then starts dumping fuel into the return line.

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Joshua

3/8 both ways.

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11.02 @ 120.56
http://www.youtube.com/watch?v=EAxRmoDgsdY
Chassis dyno
http://www.youtube.com/watch?v=wd6hFGzLJMc

No such thing as too big a return line. If it was too small, you wouldn't be able to adjust pressure low enough due to the artificial restriction the line makes. If there's not enough pressure the regulator takes care of the rest.

ok 3/8 it is. thank you. i got around to thinking about it and came up with what yall said about the smaller line not letting the regulator do its job. just wanted to make sure. thank you for all the replies.