mainboyd

ok I think I will just replace the wastegate and turbo precontrol solenoid back to the first one and see what happens. If I still have the same problem then ill change out the turbo control actuator and see what happens from there.

thanks twinsinside for your help

twinsinside

iTrader: (34)

You may also want to verify your tensioner arms for the actuators, there's a procedure for it in the FSM if I remember correctly.

Mahjik

iTrader: (1)

Re-check your work around the wastegate. Sounds like the wastegate is not opening to regulate your boost.

mainboyd

So if there is any kind of uncontroled boost increase then it's a good chance that it could be something that deals with the wastegate yea?

I don't get why the PFC didn't control it from going that high...

Mahjik

iTrader: (1)

If you have uncontrolled boost, then it's something with the wastegate. Considering you were just messing with the wastegate and pre-control solenoids (as well as testing the actuators), I would re-check what you did.

twinsinside

iTrader: (34)

The PFC doesn't physically control the wastegate. It can send the correct signals all day but if the problem is mechanical at or past the solenoid it has no way of knowing there's a problem. It can't even detect if the solenid is physically working.

Most likely, either the actuator is physically not opening up the wastegate or the arm connected to the actuator that physically opens the wastegate has a problem or needs adjusted. The length of the arm is adjustable, but I don't know how much of a problem that could cause, I've never had to mess with mine.

mainboyd

Well I found out that the hose connected to the primary turbo coming from the turbo precontrol actuator was popped off because I didnt zip tie it back after testing it again. So I plugged it back in, zip tied it and went for a test drive. The primary turbo was getting its full boost, thats good. But then when it came to between 4000rpm and 4500rpm the car lost all its boost. So I slowed down and started driving in second and I was only getting .05bar of primary boost, which is almost nothing, and a ssshhh air sound coming from the passenger side. I then continued on to 4000rpm and the air sound went away and I started gaining full boost (.73bar) for my secondary turbo after 4500rpm.

So now my primary turbo has no boost but my secondary turbo does....
Back to where I started...

mainboyd

It doesnt make sense for the secondary turbo to come on if im not getting any boost from my primary turbo right?

twinsinside

iTrader: (34)

I'm not sure I understand what you're saying.

2nd to last post says the primary turbo was getting full boost, last post says you're not getting any boost from the primary turbo.

What PSI are you hitting when you do a pull on the primary? When it drops into transition what PSI are you at? Are you saying that when the secondary comes on you lose all boost at 4-4.5k rpm? So is this a 10 - ? - 0 boost pattern you have?

Troubleshooting should involve making sure the primary is working, then you can work on the secondary. It's possible you have more than one problem too, that's always fun

mainboyd

Yea this is getting really confusing because one day only my primary turbo is working after I do a little testing and then the next day only my secondary turbo is working…

But no joke I believe I do have more than one problem going on here.

yes when the secondary comes on (if the primary turbo is getting its boost) I lose all boost at 4-4.5k rpm and up.
And yea its like a 11-?-0 pattern after woking on it then its a 0-0-0 after going over 4500rpm then its a 0-8-11 after turning it off then driving it again without working or changing anything on the car...

Its soo weird because after I work on it the primary boost is working fine but when I hit 4-4.5RPM the secondary turbo looses all boost and the primary doesn’t work anymore. Like maybe the ccv opened for the secondary to kick in at 4500RPM but the secondary turbo isn’t working for some reason and so when I start to drive under 4000RPM the ccv is probably staying open or something and that’s why im not getting any more boost in my primary.… I don’t know im just guessing… but the next day after all that, not doing anything to the car, my primary turbo is not boosting but my secondary is…. So weird and frustrating!!!

I think im just going to leave the car alone for now and do major research and major thinking on everything!!

Mahjik

iTrader: (1)

As a test, you can force the CRV closed all the time (or remove and cap it). If you have secondary boost then you know for sure the CRV is not closing ~4200 rpms. I have a feeling this is what is happening if you really are getting basically 0 boost after ~4500 rpms.

mainboyd

Do you think this is my problem??

From 0 to 4,500 RPM with a vacuum applied to Chamber A, the Charge Control Valve stays closed, as Primary boost is always greater than a vacuum. Note, that the vacuum supply is from the Vacuum Chamber, thus leakage of the one-way check valve for the Vacuum Chamber will result in Primary boost applied on both sides of the actuator resulting in this valve opening when it should not, dumping Primary boost through the Charge Relief , Secondary Turbo and out the Charge Relief Valve.
This is under "Primary Turbocharger Leaks, Charge Control Solenoid / Actuator / Valve": http://www.autosportracetech.com/RX-...#VacuumChamber

It sounds like my problem because today after working/testing everything again on the car, I give it another test drive and the car runs 10psi under 4000rpm then when it hits 4500rpm+ it drops down to .7psi. Then when I slow down or stop the car and start driving it again I get .7psi for my primary and 10psi for my secondary, 0-?-10 pattern.

Im trying to explain it the best I can, but its really hard to... maybe I should take a video clip of the whole thing lol.

mainboyd

im looking at my "purge control solenoid" under the UIM and its a 2-way valve... shouldnt it be a 3-way valve with a cap on the end of the valve over a nipple??

I never did change the purge control solenoid out from the JDM motor.

adam c

iTrader: (2)

Have you replaced your check valves?

mainboyd

Only the ones that did not pass the vacuum test. Is there a pressure test for the check valves?

mainboyd

I should just replace all of them with new ones. Is there a local store that sales these check valve?

gracer7-rx7

iTrader: (16)

PM Dale Clark for check valve replacements made of viton.

Mahjik

iTrader: (1)

Start by plugging the CRV so it's always closed. See if you have full boost after 4000 rpms all the time.

mainboyd

ok thanks, how much do they go for?

ok ill try that right now.

adam c

iTrader: (2)

They are pretty cheap from Dale. Replace all of them. Could solve your problem.

mainboyd

ok so today’s results:

First, what I said on post #38 was wrong, I meant to say "turbo control (vacuum) solenoid" not "purge control solenoid". But I did change out the "turbo control (vacuum) solenoid" that came on the JDM engine because it was only a 2-way valve (which looked just like the purge control solenoid and it was only on by two threads because it wasn’t long enough), with a three way turbo control (vacuum) solenoid, that I had on my old engine. Also, I saw that the JDM engine didn’t have a purge control check valve so I got one from my old engine and put that in as well.

Now I give it another test run and I got a little over .7bar under 4000RPM then I go over 4500RPM and it shows on my boost gauge that im doing 14psi however, on my PFC it shows that im doing .75bar BUT I don’t feel a thing anyways. What I mean by not "feeling a thing" is that I don’t feel any pull. The car is still accelerating at normal speeds and for some reason the RPM jumps high quick but I don’t feel any pull back like the first turbo under 4000RPM.

So then I did what Mahjik said by blocking off the Charge Relief Valve and give it another test run and I still get the same results.

However, I am still getting primary boost all the time.

Mahjik

iTrader: (1)

The turbo control has two solenoids which control it's functionality. One of them has 2 ports and is mounted onto the ACV. The other is a standard 3 port solenoid which is mounted on the solenoid rack.

mainboyd

The one that I replaced is called "turbo control (vacuum)" according to Dgeesaman on post #4 from https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-test-your-solenoids-actuators-other-turbo-stuff-802060/

Mahjik

iTrader: (1)

If you replaced that one with a 3 port (rack solenoid), you caused yourself a problem. Take a look at the vacuum diagram:

http://www.fd3s.net/vacuum_hose_diagram2.jpg

You'll notice there are TWO solenoids for the Turbo Control. Only one of them is a standard 3 port:

mainboyd

According to the vacuum diagram, I replaced the solenoid valve (turbo control), which is right next to the air control valve, because what was there before I replaced it was what seem to look like a solenoid valve (purge control), which only has two ports. The solenoid valve (turbo control), that is next to the air control valve, should be a three port solenoid that has a cap on the end of one of the ports, is that right?

So what I did was replace the two port solenoid, that was in the spot of the solenoid valve (turbo control) next to the air control valve, with a solenoid valve (turbo control) that has three ports with a cap on the end of one of the ports.

Again the solenoid valve (turbo control) looks just like the solenoid valve (purge control) but with third port at the end of it that’s capped. Does not look like one of the rack solenoids in the center.