RE Suzuki

Mods: Greddy smic, M2 stage 3 ECU, Down pipe, ARC Intake

"This all happened after installing the motor and seq. twin turbo"

I was consolting with Mahjik regards to this case and thought I should also ask all you as well. The problem I'm faced with is that after the installation of low mileged turbo and mazda reman, the secondary turbo stopped boosting. I get full boost upto 0.9bar, but after 4500rpm it drops down to 0.5-0.6bar. Everything was in working order untill I had my turbo and motor installed. My mechanic re-assembled the tubo with actuator, oil line and etc....

I have checked the two electric connectors which connects right in front of the UIM but both connectors were pluged in the way it should be. I have checked the vaccum chamber by pulling out one of the hose and there was pressure held with in. I went under the car and checked the actuators both precontrol and the wastegate. It turns out that the top actuator (wastegate) rod is in "pushed in" postion, where as the bottom actuator (precontrol) has its rod in "pulled back" postion.

How should the actuator be positioned when the motor is shut down? Should it be in pull back position like the precontrol actuator is positioned? or should it be in pushed in position like the wastegate is positioned?

I'm suspecting the actuator being stuck open, but I do not know how they are supost be when its functioning nomal. What do you think? Could this be the cause of the secondary not comming online?

What do you all think??

please help me!

Thanks!

Tadashi

Flybye

Images up as promised.

And don't forget to check your PM

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-do-stock-seq-turbos-work-35851/

Does anyone else have a problem bringing up the menu to transfer that thread over here?

RE Suzuki

Thanks Flybye for the images. My mechanic is checking the vaccum lines now. He said that the actuators seems like they are working fine, because "Rods on both actuators moved" when he pulled and pushed in and out....

::Additional information::
I had a manual boost controller on the wastegate. Wierd thing is that when i turned up the boost, the boost on my secondary remained 0.5-0.6bar....boost controller did no effect to the boost.

Flybye

Ahh....it's great to see newbies at work

There is a spring in the actuator. Even if the diaphram is split, the actuator rod WILL travel in and back out.

Same with the solenoids. If you were to blow through a solenoid, and air doesn't or does pass through it proves nothing because the electrical solenoid itself could be stuck in X position and not move at all once electricty is applied to it!

The BEST way to test all actuators, solenoids, and one way valves is with the link to the tool that I gave you. The shop manual will tell you the necessary amount of pressure/vacuum required to move each actuator. If X amount of pressure/vacuum is applied and the actuator doesn't move, then you know what the problem is. Or at least what ONE of the problems could be

RE Suzuki

haha yes infacet I'm a newbie! A newbie, whoes trying soo hard to fix this problem with soo little of knowledge. All I know is that Everything was great untill I had my motor and turbo re-installed. I'm just stumped at this point. I should have more information by tomorrow. My mechanic is checking for the vaccum hose leak.....help this newbie out!

Flybye

Well, if everything was working PERFECTLY before the install, then it should be nothing more than a loose or incorrectly attached hose.

But keep in mind.....the FD is pretty old. A lot of the plastic on the pressure & vacuum tanks and the solenoids could be pretty brittle, and the nipple on any one of them may have also accidentally broken off.

RE Suzuki

Ok thankx Flybye.

My case is little different but could be be that my vaccum and pressure hose on TCA is swapped around, like arutha's car was?

mad_7tist

are you sure the crv is not staying open and venting boost after 4500 when it should be closed?

Flybye

That falls under the loose or incorrectly attached hose category

RE Suzuki

That, I'm not quite sure. How do you check the CRV?

It was working before the replacement of my twin tubo though...

Flybye

Take a looky at the color diagram.

The CRV is connected to the CRV solenoid.
The CRV solenoid is connected to the vacuum chamber and pressure side of the turbo.
The leg bones connected to the......hip bone.

Whats the job of the CRV? To release boost created by the 2nd turbo during prespool up.
So what happens if the CRV is stuck open? Boost will be vented, and will CONTINUE to vent it past 4500rpms.

How would you check it? With the handy dandy tool I showed you. The shop manual will tell you the exact amount of vacuum the CRV needs in order to open up. Of course, if it's stuck open, you will be able to see right through it

RE Suzuki

Thank you guys for the input!! You guys are great! I wish I had more knowledge about seq. turbo like you guys do.

My mechanic just called and told me that all vacuum lines are connected. No loose lines can be found. He sprayed in some oil into the actuator in case the actuators are stuck open. I'm going to test drive it tomorrow...if that didn't take in effect, I'll check the TCA by looking right through it!

AHh...rx7...constant headache, pain, and sadness...

Flybye

It's like a fine chick. High maintanance but worth it once you get jiggy

RE Suzuki

haha yea exactly. But right now it feels like my "fine chick" just dumped me without a reason!
This is me screaming deep within: "wHYY??? I've spent soo much money on you, what else do you want? Please, dont do this to me!"

RE Suzuki

I test drove my car this morning. Magic of lube? Its boosting 0.7bar/10psi at secondary now! Weird thing is, I have M2 ECU and should be at 12psi?
I do not have all the mods which are compatible with the stage 3 M2 ECU, could that be the cause? Well, thank you all for your help, especially Flybye.

Problem: secondary only boost upto 0.5bar to 0.6bar.
Cause :wastegate
Solution: touch of oil in the wastegate/loosen up the rod

RE Suzuki

Though I thought this was over, it continues....

I test drove the car again and my boost starting to drop. This time, the boost got even lower. I poped the intake hose and checked the CRV. I found the CRV with a little nipple which is not attached to anything! I'm trying to find the small nerrow hose but its no where to be found...is there anyother hose which i can hack into and connect it to CRV?

Flybye

The CRV has to attach directly to that CRV solenoid.
You have to trace back where the solenoid is and connect it!

RE Suzuki

I've figured it out now! The line which comes from LIM (which supost be on CRV)was connecting to the to the pipe where it should been nothing connected to. (ONLY for AUTO pipe). I checked the CRV and turned out that he had nothing connected to the little nipple. So I pulled out the hose from the empty pipe, and connected to the CRV, and guss what? OMG its boosting perfectly and oh my, that thing got fast! Thank you sooo much! Now, I'm really happy the fact that everything is running great besides the rear suspension problem. I can drive on the street with confidence now. I really appriciate for your help.


Secondary boost problem. "THE END!"

Flybye

Another happy customer LOL

RE Suzuki

yeps!