redline808

1JZ, single turbo, tial 44.

What waste gate spring pressure would be recommended for a street driven 1JZ. looking to make in the 500-600hp range in the end. Right now my Tial MV-R has a 1.0 bar spring. Going to the dyno soon and want to stay in the 400's hp for now. Should I get a lower spring?

Thanks.

SChema

iTrader: (2)

The wastegate will help you regulate base boost pressure. Depends on how much boost you want to run as "low boost". I wouldn't necessarily say the wastegate will "get" you to you power goals but "keep" you there.

turbodremz

iTrader: (18)

Go with what ever your injectors can handle..get bigger injectors later and pair it with an ebc, then up the boost to your liking.

redline808

Basically I need to know what others experiences are. I would like a spring pressure that will keep me under 400 but still be able to reach 500-600hp. (edit) reach 500-600 with a ebc.

thanks.

turbodremz

iTrader: (18)

1 spring wont do that. If you want that kind of adjust-ability, go with a Synapse WG..otherwise your going to have to settle with a 12-15psi spring, and get a boost controller. But basing your HP on just the WG spring is almost impossible to do without knowing what other mods have been done with the engine...cams/manifold/turbo specs/injectors/etc..

redline808

well my mv-r has a brown, maroon, grey springs. which make it 1 bar. looks like i will take out the brown which will lower it to 0.8 bar. to start. or pull out the grey to make it a 0.6 bar. and use my boost cont. to go from there.

thanks.

vangb2

iTrader: (2)

I'm pretty sure most waste gate has 2 ports that you can create equal pressure on both side of the diaphragm so it does not open before you want it too.

Alex L.

iTrader: (1)

Rule of thumb is you can go 12psi over what your wastegate spring is rated to. Look at some dyno graphs and make a decision.