boost issue after rebuild
09-09-09, 10:55 PM
#1
go team shake
Thread Starter
iTrader: (1)
Join Date: Sep 2008
Location: temecula ca
Posts: 173
Likes: 0
Received 0 Likes
on
0 Posts
boost issue after rebuild
i have a 1993 fd the only mod is hks cat back. i got her back from the shop put the full 2000 miles before boosting and now that i can, there is an issue. 3rd gear pull from 35mph 10psi then when time comes for the second turbo to kick in she drops down to 5psi and once she gets to 6k rpms the boost bounces from 5 to 7 psi wtf is up.... any help is appreciated thanks
evan
evan
Last edited by rx7/24/7; 09-09-09 at 10:57 PM. Reason: left out a word
09-11-09, 03:15 PM
#4
So, you are basically getting a 10-5-5 to 7 pattern.
A quick check you can do is the following:
Remove the black pressure chamber at the front of the UIM and look at the two solenoids that are right behind it. The left is turbo precontrol, the right one is wastegate control. The harness plug with the white tape on it should go to the right one.
If they are reversed (which I have seen happen) you will get a boost pattern very similar to yours (usually 10-5-6).
A quick check you can do is the following:
Remove the black pressure chamber at the front of the UIM and look at the two solenoids that are right behind it. The left is turbo precontrol, the right one is wastegate control. The harness plug with the white tape on it should go to the right one.
If they are reversed (which I have seen happen) you will get a boost pattern very similar to yours (usually 10-5-6).
09-14-09, 12:49 AM
#7
Check the link to the turbo system in this thread
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
I'm also troubleshooting a boost issue at transition to the 2nd turbo.
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/faq-3rd-gen-other-useful-links-68640/
I'm also troubleshooting a boost issue at transition to the 2nd turbo.
Trending Topics
09-14-09, 10:13 AM
#8
+1 on gracer7-rx7's recommendation
Specifically, have your installer go over the turbo control solenoids, hose routing and check valves. You can eliminate the wastegate and pre control solenoids out of the equation by installing a boost controller, like a Greddy Profec-B Spec II. You can diagnose a lot of these types of problems by T-ing into some of the vacuum lines at specific locations to check for pressure and vacuum under varying RPM and manifold pressure conditions.
Check this out: http://se3p.com/index.php?title=FD3S...s.2C_and_Tanks
Specifically, have your installer go over the turbo control solenoids, hose routing and check valves. You can eliminate the wastegate and pre control solenoids out of the equation by installing a boost controller, like a Greddy Profec-B Spec II. You can diagnose a lot of these types of problems by T-ing into some of the vacuum lines at specific locations to check for pressure and vacuum under varying RPM and manifold pressure conditions.
Check this out: http://se3p.com/index.php?title=FD3S...s.2C_and_Tanks
09-15-09, 12:41 PM
#10
Senior Member
iTrader: (15)
Join Date: Jan 2009
Location: La Mirada, Ca
Posts: 334
Likes: 0
Received 0 Likes
on
0 Posts
I gave up on my solenoids working properly and just bought two halman pro rx manual boost controllers, The transistion is smoother, boost builds quicker and its overall a much simpler design, Perfect 10-8-10 pattern with both solenoids unplugged and capped.
09-21-09, 09:55 PM
#14
go team shake
Thread Starter
iTrader: (1)
Join Date: Sep 2008
Location: temecula ca
Posts: 173
Likes: 0
Received 0 Likes
on
0 Posts
ok so im super amped i just fixed my boost issue like 5 min. ago. i went over my vac-lines one last time and i found one that had collapsed, swapped it out and bam 10-8-10. thank u guys for all the help u guys r the ****!
evan
evan
Thread
Thread Starter
Forum
Replies
Last Post
rxmiles
3rd Generation Specific (1993-2002)
9
08-24-15 02:07 PM
