6-7 psi primary and no transition to secondary
10-20-10, 04:35 AM
#1
Yes it's twin turbo...
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6-7 psi primary and no transition to secondary
Ok a little background info. I did a complete vac job in 08' after completing it and still having secondary boost issues I just dealt with it. Now 2 years later Ive dug back into the problem.
I pulled the rack out and tested each and every solenoid with only 4 of them passing the "pressure" testes as per Dave Geesman's testing procedure https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-test-your-solenoids-actuators-other-turbo-stuff-802060/. I reinstalled the rack with all new check valves from Dale Clark and she started up and idled perfectly which she wasn't doing before. So I feel confident I did something correct and take her for a spin. The boost is spotty only boosting after decelerating and then wot. So since I had brand new check valves I tested the pressure and vacuum chambers, both passed and had no leaking. After a day or two of reading now, I go back out determined that it is the check valves. So I test them and the two I tested, the pressure and vac chamber check valves, both are leaking... so I test my old ones and they are holding fine. Thinking I figured out the problem I take her for a spin once more. The only thing that changed is I am getting a consistent 6-7 psi on the primary. I switched the wastegate and pre control connectors and had the same result. after that run I pull a line off the pressure chamber and no "hissing" sound is heard, also I am not getting any boost during neutral revs... I tested my cca and it is working properley but after doing a wot run past 4500 rpms with no boost there is a strange "byew" sound just like Dale Clark explains in this post https://www.rx7club.com/showthread.p...ighlight=bheyw
So this is where Im at
-No Hissing noise from pressure tank
-only 6-7pis primary with no secondary and strange beyw noise
-no boost during neutral revving
-all solenoids tested and important boost solenoids passed all bench tests.
-check valves are tested and pointing in the correct direction
-Vac and pressure tanks hold 25+ inhg no leaking
-99 spec turbos so I believe they have the restrictor pills built in.
I tried to be as detailed as possible and yes I have been searching for the past week on different issues with no luck.
Any positive feedback is greatly appreciated!
I pulled the rack out and tested each and every solenoid with only 4 of them passing the "pressure" testes as per Dave Geesman's testing procedure https://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-test-your-solenoids-actuators-other-turbo-stuff-802060/. I reinstalled the rack with all new check valves from Dale Clark and she started up and idled perfectly which she wasn't doing before. So I feel confident I did something correct and take her for a spin. The boost is spotty only boosting after decelerating and then wot. So since I had brand new check valves I tested the pressure and vacuum chambers, both passed and had no leaking. After a day or two of reading now, I go back out determined that it is the check valves. So I test them and the two I tested, the pressure and vac chamber check valves, both are leaking... so I test my old ones and they are holding fine. Thinking I figured out the problem I take her for a spin once more. The only thing that changed is I am getting a consistent 6-7 psi on the primary. I switched the wastegate and pre control connectors and had the same result. after that run I pull a line off the pressure chamber and no "hissing" sound is heard, also I am not getting any boost during neutral revs... I tested my cca and it is working properley but after doing a wot run past 4500 rpms with no boost there is a strange "byew" sound just like Dale Clark explains in this post https://www.rx7club.com/showthread.p...ighlight=bheyw
So this is where Im at
-No Hissing noise from pressure tank
-only 6-7pis primary with no secondary and strange beyw noise
-no boost during neutral revving
-all solenoids tested and important boost solenoids passed all bench tests.
-check valves are tested and pointing in the correct direction
-Vac and pressure tanks hold 25+ inhg no leaking
-99 spec turbos so I believe they have the restrictor pills built in.
I tried to be as detailed as possible and yes I have been searching for the past week on different issues with no luck.
Any positive feedback is greatly appreciated!
10-21-10, 06:31 PM
#3
Have you gone through the primary turbo troubleshooting procedure from the autosport site?
http://www.autosportracetech.com/RX-...erOverview.htm
What were the results?
Your secondary probably isn't spooling since the primary isn't generating enough boost.
http://www.autosportracetech.com/RX-...erOverview.htm
What were the results?
Your secondary probably isn't spooling since the primary isn't generating enough boost.
10-25-10, 01:54 AM
#4
Yes it's twin turbo...
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The only thing I haven't checked yet, only because I thought it would be too simple of a fix is the intercooler hoses... I'll check them tomorrow. but would that have anything to do with the pressure chamber not releasing any air once I pulled a hose off it? Thanks
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10-25-10, 07:59 PM
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Yes it's twin turbo...
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Ya no kidding! It would be who of any one to double check the new ones before installing them... Im going out now to check the hoses, I'll report back later.
10-25-10, 10:08 PM
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Yes it's twin turbo...
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OK so I found a leak in one of the couplers
-Primary is perfect
-No Secondary transition
-Check valves have been re checked
-Pressure chamber does not hiss when unplugged
-charge control actuator is functioning properly at idle (ie the rod is pushed in)
-Vacuum at idle is 14 inhg
-Primary is perfect
-No Secondary transition
-Check valves have been re checked
-Pressure chamber does not hiss when unplugged
-charge control actuator is functioning properly at idle (ie the rod is pushed in)
-Vacuum at idle is 14 inhg
10-26-10, 07:10 PM
#12
Yes it's twin turbo...
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Ok update, just found that my vacuum chamber and pressure chamber hoses were switched, tricky bastards lol.
with that said my boost pattern as of 5 min ago is 11-7-14-8.... if that makes sense, spikes during the transition for a sec and drops to 8psi. my only Idea is that I used the silicone coupler that connected my secondary turbo to my intake to fix my cracked coupler from a few posts up. Im thinking that the turbo has no air restriction on the inlet side so it spikes. but like I said it drops down to 8 psi so Im not sure if thats the whole story... any insight?
with that said my boost pattern as of 5 min ago is 11-7-14-8.... if that makes sense, spikes during the transition for a sec and drops to 8psi. my only Idea is that I used the silicone coupler that connected my secondary turbo to my intake to fix my cracked coupler from a few posts up. Im thinking that the turbo has no air restriction on the inlet side so it spikes. but like I said it drops down to 8 psi so Im not sure if thats the whole story... any insight?
10-29-10, 04:24 PM
#14
Ok update, just found that my vacuum chamber and pressure chamber hoses were switched, tricky bastards lol.
with that said my boost pattern as of 5 min ago is 11-7-14-8.... if that makes sense, spikes during the transition for a sec and drops to 8psi. my only Idea is that I used the silicone coupler that connected my secondary turbo to my intake to fix my cracked coupler from a few posts up. Im thinking that the turbo has no air restriction on the inlet side so it spikes. but like I said it drops down to 8 psi so Im not sure if thats the whole story... any insight?
with that said my boost pattern as of 5 min ago is 11-7-14-8.... if that makes sense, spikes during the transition for a sec and drops to 8psi. my only Idea is that I used the silicone coupler that connected my secondary turbo to my intake to fix my cracked coupler from a few posts up. Im thinking that the turbo has no air restriction on the inlet side so it spikes. but like I said it drops down to 8 psi so Im not sure if thats the whole story... any insight?
I have exactly the problem. I did a lot of search and replace a few things like duty valve among other stuff but still no luck. secondary never come on.
and my problem is after I upgrade to 99spec turbo.
so you're saying these 2 lines were switched? (please see pictures)
is it safe to switch them. I want to try my luck if it is the case for me too.
thanks
10-30-10, 02:20 PM
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Yes it's twin turbo...
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If your lucky, you will have the same problem, since its an easy fix. the tale tell sign is that when you turn your car off, and pull a line coming off the pressure chamber, it should hiss, if it doesnt you either have bad check valves or the two lines I circled are switched
10-31-10, 12:02 AM
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Yes it's twin turbo...
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Its done! totally fixed now!!!!!!!!!!!!!!!! Im so stoked, I bought two hallmans, and set it up like damian, but I had to drill out my restrictor pills because they are built into the 99 turbos. I feel like rebuilding the engine would be an easier task haha
11-07-10, 11:46 AM
#23
If your lucky, you will have the same problem, since its an easy fix. the tale tell sign is that when you turn your car off, and pull a line coming off the pressure chamber, it should hiss, if it doesnt you either have bad check valves or the two lines I circled are switched
my problem is on 1st & 2nd gear I don't have secondary boost. after reach 4500rpm, boost drops and goes flat until redline. but I test and test on 3rd, 4th gear again and again, I do have boost after 4500rpm. eh... too scary to test on 5th gear but I assume it should be fine.
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