11-8-4.5 pattern. strange sound at certan RPM
#1
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
11-8-4.5 pattern. strange sound at certan RPM
My Second Turbo is not kicking in. boost shows 11-8-4.5psi. Is there a chance that secondary turbo is not blown? Also there is a strange sound only at around 2500-3000rpm. It goes like BRAAAW. i found the tube is open i dont know what tube is this, the sound comes from around that area, not not sure though. I'm uploading the video on youtube and will post it as soon as available.
Last edited by beqa16v; 01-22-08 at 06:15 AM.
#3
Autocrossed. I got CONED!
iTrader: (4)
Join Date: Jun 2006
Location: Lake Charles, LA
Posts: 629
Likes: 0
Received 0 Likes
on
0 Posts
Charge relief solenoid (pretty easy to get to)
Charge relief valve or "CRV"
Boost leak from rear half of Y-pipe
Could be lots of things, but that's where I'd start.
http://www.fighters-garage.com/rx7.html
Scroll all the way down to the bottom, that thing is a life saver.
Charge relief valve or "CRV"
Boost leak from rear half of Y-pipe
Could be lots of things, but that's where I'd start.
http://www.fighters-garage.com/rx7.html
Scroll all the way down to the bottom, that thing is a life saver.
#4
Mr. Links
iTrader: (1)
I don't believe the sound has anything to do with your boost issue. Check this thread on the sound:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/eliminate-air-pump-moo-%241-1-minute-486061/
As for your boost issue, I would start with checking the check valves for the turbo control system. Make sure you don't have a mis-routing issue with the vacuum lines as well.
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/eliminate-air-pump-moo-%241-1-minute-486061/
As for your boost issue, I would start with checking the check valves for the turbo control system. Make sure you don't have a mis-routing issue with the vacuum lines as well.
#5
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
Here is the video of i took today the sound comes only at certain, very nerrow rpm range and the dissapears again: http://www.youtube.com/watch?v=8MECu98alOw
#7
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
#10
Mr. Links
iTrader: (1)
#11
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
ok this thred turns into official help beqa with his car thread. i noticed that when warm but still not at fully operating temperature i rize revs a little and let them fall beck, the engine stumbles a little for 2-3 seconds and then goes back to normal idle again. this doesnt happen when engine is fully warmed up
also, we tested boost again with another gauge and it showed 7psi and then started to go down at very high RPMs it stayd at 4psi
also, we tested boost again with another gauge and it showed 7psi and then started to go down at very high RPMs it stayd at 4psi
#12
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
Charge relief solenoid (pretty easy to get to)
Charge relief valve or "CRV"
Boost leak from rear half of Y-pipe
Could be lots of things, but that's where I'd start.
http://www.fighters-garage.com/rx7.html
Scroll all the way down to the bottom, that thing is a life saver.
Charge relief valve or "CRV"
Boost leak from rear half of Y-pipe
Could be lots of things, but that's where I'd start.
http://www.fighters-garage.com/rx7.html
Scroll all the way down to the bottom, that thing is a life saver.
#13
Mr. Links
iTrader: (1)
#14
Original Gangster/Rotary!
iTrader: (213)
ok this thred turns into official help beqa with his car thread. i noticed that when warm but still not at fully operating temperature i rize revs a little and let them fall beck, the engine stumbles a little for 2-3 seconds and then goes back to normal idle again. this doesnt happen when engine is fully warmed up
also, we tested boost again with another gauge and it showed 7psi and then started to go down at very high RPMs it stayd at 4psi
also, we tested boost again with another gauge and it showed 7psi and then started to go down at very high RPMs it stayd at 4psi
You'll have to start checking vacuum hoses, solenoids and check valves. Good luck, the seq system can be a nightmare for a first timer.
#15
Senior Member
iTrader: (2)
Check the hose off the y-pipe that leads to the charge relief valve. It is the 3/4ths inch hose just below the 3" hose in your picture. You can also see the top of the charge relief valve in the picture (right at the bottom edge). The hose I mentioned is known to split or crack at the bend.
#16
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
Check the hose off the y-pipe that leads to the charge relief valve. It is the 3/4ths inch hose just below the 3" hose in your picture. You can also see the top of the charge relief valve in the picture (right at the bottom edge). The hose I mentioned is known to split or crack at the bend.
I replaced it with another hose. Also i found that fose on primary turbo inlet was lose and tghtened it. didnt have a chance to look under the car at turbo control actuator but with KOKO test i saw charge control actuator work. Now primary spools up realy fast to 10psi but then boost again falls down gradualy to around 4 psi. I will check turbo control actuator tomorrow, what else should i check?
#17
Senior Member
iTrader: (2)
Then it is probably either the charge relief valve or the charge relief solenoid (in the rack) that is not operating properly. You are blowing boost out of the y-pipe so if the hoses are all intact and the charge control valve is working, then it comes down to the charge relief function. It mus be hanging open. Be sure also that the y-pipe is bolted up tight to the turbo output ports.
#18
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
getgone
I will test charge relief valve today with pressure and boost gauge, we fabricated custom, very funny device for this
Maybe i'm missing something but i didnt find charge relief solenoid on your link only charge relief valve.
I will test charge relief valve today with pressure and boost gauge, we fabricated custom, very funny device for this
#19
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts
Problems with my sequential
So i decided to open new topic, my previous topic is here: https://www.rx7club.com/showthread.php?t=723333
After finding and replacing cracked hose leading to blow off valve, my first turbo boost improved. its boosting 10psi and then gradualy falls down to 4. I'm measuring boost from intake manifold.
Today I checked double throttle actuator and i found that there is no vacum in that hose . We removed intake manifold an saw that that hose was going into a pipe and the other side of that pipe was leading nowhere also there is one empty pipe there
see the pic below:
On vacuum diagram i checked that it must lead to second vacuum chamber but i couldnot find this second chamber. do you guys have pictures by which i can find this chamber?
follow green wire coming from double throttle actuator below:
After finding and replacing cracked hose leading to blow off valve, my first turbo boost improved. its boosting 10psi and then gradualy falls down to 4. I'm measuring boost from intake manifold.
Today I checked double throttle actuator and i found that there is no vacum in that hose . We removed intake manifold an saw that that hose was going into a pipe and the other side of that pipe was leading nowhere also there is one empty pipe there
see the pic below:
On vacuum diagram i checked that it must lead to second vacuum chamber but i couldnot find this second chamber. do you guys have pictures by which i can find this chamber?
follow green wire coming from double throttle actuator below:
#25
Senior Member
Thread Starter
Join Date: Sep 2006
Location: Tbilisi
Posts: 393
Likes: 0
Received 0 Likes
on
0 Posts