Need Turbo Advise - Tilted Forum Project Discussion Community

merkerguitars · 11-17-2004, 10:40 PM

Well me and my roomate have been working on a project for a little bit. Its a 1994 mazda protege with a 1.8L DOHC engine. He ordered a turbo manifold, ignition box and we pulled a turbo off a a 1992 Ford Probe with the 2.2L engine in it. We have it pretty my much planned out (coolant lines, oil feed etc) The questions we have are with the vacuum system. On the turbo on the exhaust side there is a valve the if you apply boost is opens a valve and dumps some of the incoming exhaust straight into the the downpipe. How should the be hooked up. Also on the factory car there was a solenoid valve that i'm not sure how it was hooked up or what it did, any idea? Also there is a little vacuum fitting on the outlet side of the intake portion of the turbo what does that go to? should it go to the vacuum port on the ignition box? Also there is a bypass valve that goes inbetween the throttle body and intercooler how do i hook up vacuum to that?

JusticeForPhat · 11-18-2004, 11:28 AM

Man, Probe enthusiast websites make my brain hurt.

Anyhow, your wastegate should be referenced to boost. Now I am having a hard time finding exactly what model turbo you have, so that nipple on the compressor side might be used for the wastegate. If not, you can tap off of the manifold and run it to the gate, as long as the wastegate is seeing boost. As far as the solenoid valve goes, like I said, I'm having some trouble finding Probe info. I do know however that you can use a valve like that to computer control the wastegate. I did something similar in my Honda F3 turbo, with a variable geometry turbo.

Anyway, some more info on the whole project would help a little. Knowing what model turbo it is would help a lot, along with how much boost you intend on running. Good luck man.

merkerguitars · 11-18-2004, 01:38 PM

It's a iHi RHB5 turbocharger I believe,
This isn't a picture of the turbo he has, but it's the exact same thing.

I believe he want to run 8psi, but i'm not exactly sure. So how exactly would be the best way to hookup the waste gate?

JusticeForPhat · 11-18-2004, 04:15 PM

Cool. it's an IHI. Good choice for the 1.8 liter, this turbo seems a little small for the 2.2 it was meant for.

Basically the nipple on the end of the control valve gets hooked to manifold pressure, ie boost. From my experience it would be best to tap pressure post intercooler, since the intercooler will provide a 1 - 3 psi pressure drop. Other than that, the wastegate should be cool. Might have to adjust the spring based on your intended level of 8 psi, I don't know how it comes setup stock.

Now if you want to get fancy, say with a stand alone fuel computer like a Haltech, you could hook a solenoid valve in between the source of boost and the wastegate. You can then use one of the PWM outputs to control the solenoid and in turn open and close the wastegate to affect things lke spool up and maximum boost.

Good luck, sounds like a hell of a fun project. I need to get off my ass and get a job so I can have some toys.

11-17-2004, 10:40 PM	#1 (permalink)
merkerguitars Buffering......... Location: Wisconsin...	Need Turbo Advice Well me and my roomate have been working on a project for a little bit. Its a 1994 mazda protege with a 1.8L DOHC engine. He ordered a turbo manifold, ignition box and we pulled a turbo off a a 1992 Ford Probe with the 2.2L engine in it. We have it pretty my much planned out (coolant lines, oil feed etc) The questions we have are with the vacuum system. On the turbo on the exhaust side there is a valve the if you apply boost is opens a valve and dumps some of the incoming exhaust straight into the the downpipe. How should the be hooked up. Also on the factory car there was a solenoid valve that i'm not sure how it was hooked up or what it did, any idea? Also there is a little vacuum fitting on the outlet side of the intake portion of the turbo what does that go to? should it go to the vacuum port on the ignition box? Also there is a bypass valve that goes inbetween the throttle body and intercooler how do i hook up vacuum to that? __________________ Donate now! Ask me How! Please use the search function it is your friend. Look at my mustang please feel free to comment! http://www.tfproject.org/tfp/showthread.php?t=26985 Last edited by merkerguitars; 11-17-2004 at 10:50 PM..

11-18-2004, 01:38 PM	#3 (permalink)
merkerguitars Buffering......... Location: Wisconsin...	It's a iHi RHB5 turbocharger I believe, This isn't a picture of the turbo he has, but it's the exact same thing. I believe he want to run 8psi, but i'm not exactly sure. So how exactly would be the best way to hookup the waste gate? __________________ Donate now! Ask me How! Please use the search function it is your friend. Look at my mustang please feel free to comment! http://www.tfproject.org/tfp/showthread.php?t=26985

11-18-2004, 11:28 AM	#2 (permalink)
JusticeForPhat Crazy Location: Philly	Man, Probe enthusiast websites make my brain hurt. Anyhow, your wastegate should be referenced to boost. Now I am having a hard time finding exactly what model turbo you have, so that nipple on the compressor side might be used for the wastegate. If not, you can tap off of the manifold and run it to the gate, as long as the wastegate is seeing boost. As far as the solenoid valve goes, like I said, I'm having some trouble finding Probe info. I do know however that you can use a valve like that to computer control the wastegate. I did something similar in my Honda F3 turbo, with a variable geometry turbo. Anyway, some more info on the whole project would help a little. Knowing what model turbo it is would help a lot, along with how much boost you intend on running. Good luck man.

11-18-2004, 04:15 PM	#4 (permalink)
JusticeForPhat Crazy Location: Philly	Cool. it's an IHI. Good choice for the 1.8 liter, this turbo seems a little small for the 2.2 it was meant for. Basically the nipple on the end of the control valve gets hooked to manifold pressure, ie boost. From my experience it would be best to tap pressure post intercooler, since the intercooler will provide a 1 - 3 psi pressure drop. Other than that, the wastegate should be cool. Might have to adjust the spring based on your intended level of 8 psi, I don't know how it comes setup stock. Now if you want to get fancy, say with a stand alone fuel computer like a Haltech, you could hook a solenoid valve in between the source of boost and the wastegate. You can then use one of the PWM outputs to control the solenoid and in turn open and close the wastegate to affect things lke spool up and maximum boost. Good luck, sounds like a hell of a fun project. I need to get off my ass and get a job so I can have some toys.