Yes it's true. It should be going off the nipple on the cold pipe.
But I don't see why it shouldn't work off that nipple.
On the evo8, the wastegate is going to a nipple on the intake.

 

I ran mine to a nipple that came off of my hotpipe. Holds the boost I set it at with my AVC-R all day.

 

Yes it's true. It should be going off the nipple on the cold pipe.
But I don't see why it shouldn't work off that nipple.

Are you serious? The intake isnt ever under any sort of boost. Its always vacuum. The wastegate needs a boost signal to work and this always comes from the hotpipe or compressor cover of the actual turbo. Its a simple feedback system.

 

iirc, when I was using the stock side mount the little nipple on the cold pipe near the CAS was were the vacuum line from the wasegate went. I thought that if there is no vacuum or pulling the vacuum line off the wastegate, it's going under full boost 14-15psi.

 

iirc, when I was using the stock side mount the little nipple on the cold pipe near the CAS was were the vacuum line from the wasegate went. I thought that if there is no vacuum or pulling the vacuum line off the wastegate, it's going under full boost 14-15psi.

boost pressure compresses the spring in the wastegate actuator. that pushes the trap door open. so if you have it on the intake, which isn't pressurized, you never push the trap door open and boost goes to the limit of the turbo.
Shaun

 

Think about it. The wastegate needs a pressure signal to activate. Meaning, it needs pressure to push the diaphram inside the actuator in order to open the wastegate valve thus regulating boost. The intake pipe is VACUUM. You will need to hook up the wastegate somewhere in the intercooler piping. If not you can T it from your BOV line. Best way to do it is after the intercooler before the intake manifold. Good luck.

 

Thanks for everyones help! Much appreciated :thumbsup

 

Best way to do it is after the intercooler before the intake manifold. Good luck.

Many would disagree with this because there is usually a pressure drop of a few PSI over the cooler. Im not sure of the exact technical reasons but i have always seen it done hotpipe side for Nissans. A lot of internally wastegated turbos take a boost signal from the compressor housing of the turbo.

 

Many would disagree with this because there is usually a pressure drop of a few PSI over the cooler. Im not sure of the exact technical reasons but i have always seen it done hotpipe side for Nissans. A lot of internally wastegated turbos take a boost signal from the compressor housing of the turbo.

Hey Joel,
I am aware of the pressure drop due to the I/C. The reason why I think its a better idea to place it after the I/C before the throttle body is because the actuator will see the same boost pressure as the intake manifold of which the boost gauge is hooked up to. I'm thinking like this: with the line before the intercooler (say boosting at 1 bar) the actuator will see a bar, while the manifold(and boost gauge) will see 12psi (guesstimation). Wouldn't that make the turbo work an extra 2 psi? If you hook up the line pre-throttle body post intercooler the actuator will see a bar, while intake manifold pressure is also a bar. Now I'm no expert, please correct me if my ideas are wrong. I currently have my vacuum line at the hotpipe but I just thought the line being after the intercooler would be a better idea. What do you think?

 

It may have some boost spiking issues - especially when you add a BOV into the system - im not too sure. It could work. If you are running with wastegate only it might be a way of compensating for the pressure drop of the intercooler to get a bit of lost power back.
The fact of the matter is if you have a boost controller it will make the turbo work as hard as you want it to anyway - so why complicate it?

 

i have the hks type s intercooler and the directions say to run the hose from the pipe after the intercooler to the wastegate...so is this correct or not?....

 

I think that you can do it either way... I called HeavyThrottle and asked Jeff about it and he told me that either way would work but he would recommend doing it on the hotpipe.
But I :12dunno
I am going to do it to what he said, On the hotpipe

 

ok, but i am using the stock hotpipe that does not have a nipple for the hose...oh well...as long as it works...

 

Also could having the line go from the wastegate to the intake cause my redtop to not idle and/or burn oil??

My car won't even idle i have to hold down the gas to get it to stay running

 

Mine goes to the cold pipe- after the IC and before the Intake Manifold.
Ive had no problems with it!! Possibly just takes longer than usual vacuum line bringing it across the front.

 

i have the hks type s intercooler and the directions say to run the hose from the pipe after the intercooler to the wastegate...so is this correct or not?....

That's correct.
Like I said, it doesn't mather what source you use. Hot pipe, Cold pipe, Vac, intake, etc. The wastegate will still work the same. I've tested it a few days ago.

 

That's correct.
Like I said, it doesn't mather what source you use. Hot pipe, Cold pipe, Vac, intake, etc. The wastegate will still work the same. I've tested it a few days ago.

intake? i think people should hold you responsible when they boost 25psi and blow their motor. it will not open when hooked up to the intake.
Shaun

 

:werd

intake? i think people should hold you responsible when they boost 25psi and blow their motor. it will not open when hooked up to the intake.
Shaun

This is true... I boosted down my driveway and it got to 15PSI :eek4: OOPS!
It never stopped building boost

 

I just checked the internal wastegate vac line yesterday on an evo8. And it was connected to the intake.
That evo boost 19psi (stock) fine all day.