Low Secondary Boost
#1
Low Secondary Boost
Did the following tests for trouble shooting but did not see any reaction to the turbo control actuator when doing the KoKO so what does this imply. My boost pattern is 12-5-5.
5) Check vacuum chamber's storage ability with engine off
Pull off vacuum hose at Charge Relief Actuator
Should hear air entering hose vacuum, re-attach hose
Start engine - briefly accelerate engine to WOT in neutral again
Turn engine off - KOKO 6 TIMES
Watch Charge Control Actuator work each time
Watch Turbo Control Actuator work each time, (need to crawl under the car to see this one)
Thanks !
5) Check vacuum chamber's storage ability with engine off
Pull off vacuum hose at Charge Relief Actuator
Should hear air entering hose vacuum, re-attach hose
Start engine - briefly accelerate engine to WOT in neutral again
Turn engine off - KOKO 6 TIMES
Watch Charge Control Actuator work each time
Watch Turbo Control Actuator work each time, (need to crawl under the car to see this one)
Thanks !
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#17
I have done everything, except change out the cats, replaced all turbo control solenoids with custom set, replaced all vacuum lines with silicone, tested the CCV, CRV, BOV, TCA with mytivac numerous times, tee'd in a vacuum gage between the TCA, the CCV and the CRV and made numerous runs and they all are turning on and off at the required 4500 and 3000 rpm settings.
Currently running with the waste gate solenoid disconnected and getting 8-5-5 boost pattern. With the wastegate solenoid plugged in I get 12,13-5-5.
My Turbo is the newer version with the restrictors built into the manifold nipples.
Some people on the forum say it could be a clogged cat and others say if I get the primary boost of 12 to 13 that I am getting the cats are not clogged and it is something else!
So I am leaning now to plugged Pre- Cat! I just do not know I have tested and tested.
I just wish there was a way to test the exhaust out put to see if there is a restriction giving evidence of a clogged cat.
Currently running with the waste gate solenoid disconnected and getting 8-5-5 boost pattern. With the wastegate solenoid plugged in I get 12,13-5-5.
My Turbo is the newer version with the restrictors built into the manifold nipples.
Some people on the forum say it could be a clogged cat and others say if I get the primary boost of 12 to 13 that I am getting the cats are not clogged and it is something else!
So I am leaning now to plugged Pre- Cat! I just do not know I have tested and tested.
I just wish there was a way to test the exhaust out put to see if there is a restriction giving evidence of a clogged cat.
#21
sherevvs
iTrader: (18)
My boost problem is that secondary doesn't come on but doesn't affect the primary either, so my boost stays at 10 all the way from 3000 to 6000 rpm. Anyone know Where should I start checking? I think it could be charge control or charge relief since they control the transition.
#22
Cheap Bastard
iTrader: (2)
My boost problem is that secondary doesn't come on but doesn't affect the primary either, so my boost stays at 10 all the way from 3000 to 6000 rpm. Anyone know Where should I start checking? I think it could be charge control or charge relief since they control the transition.
#23
The logic being (as Adam stated) that the primary turbo on its own will not supply 10psi through the entire rpm range. Its just not big enough on its own.
(If the primary could do that, there would be no need for twin turbos)
It takes two turbos to maintain 10 psi after 4500rpm.
#24
sherevvs
iTrader: (18)
thanks guys. that does make sense. But I don't have a "dip" at the transition and I don't feel that there is a "pull" when the secondary kicks in at 4500 rpm. My car used to have the 10-8-10 and I used to be able to feel the secondary kicking in right after the dip but oddly it's gone now.
On a different boost issue though, I know I get no boost at all in first gear and in 2nd there is boost ONLY if i WOT. from 3rd and on boost kicks in between 2000-3000 rpm like it should and I know this could be a faulty TCA solenoid after some research on the forum (bought one from Ray but haven't install). Well, the interesting thing is I just started DD my FD and I found out ONLY when it's about 80F out and after I drive the car 20 mins or so when the water temp gets to 195-200 F, the car boosts perfectly and I start getting boost in lower rpm range like it should even in first gear (but still no full 10psi in 1st ever). and I do eventually get the dip from "10-8-10" so this leads me into thinking what in the turbo control system is temperature dependent and will only work well when the car is hot. Or maybe I have a clogged pre cat? I still have the stock precat for this 94 touring with 110K miles on precat. (sounds like a nightmare)
On a different boost issue though, I know I get no boost at all in first gear and in 2nd there is boost ONLY if i WOT. from 3rd and on boost kicks in between 2000-3000 rpm like it should and I know this could be a faulty TCA solenoid after some research on the forum (bought one from Ray but haven't install). Well, the interesting thing is I just started DD my FD and I found out ONLY when it's about 80F out and after I drive the car 20 mins or so when the water temp gets to 195-200 F, the car boosts perfectly and I start getting boost in lower rpm range like it should even in first gear (but still no full 10psi in 1st ever). and I do eventually get the dip from "10-8-10" so this leads me into thinking what in the turbo control system is temperature dependent and will only work well when the car is hot. Or maybe I have a clogged pre cat? I still have the stock precat for this 94 touring with 110K miles on precat. (sounds like a nightmare)
#25
sherevvs
iTrader: (18)
Car is all stock except for RB cat back
thanks guys. that does make sense. But I don't have a "dip" at the transition and I don't feel that there is a "pull" when the secondary kicks in at 4500 rpm. My car used to have the 10-8-10 and I used to be able to feel the secondary kicking in right after the dip but oddly it's gone now.
On a different boost issue though, I know I get no boost at all in first gear and in 2nd there is boost ONLY if i WOT. from 3rd and on boost kicks in between 2000-3000 rpm like it should and I know this could be a faulty TCA solenoid after some research on the forum (bought one from Ray but haven't install). Well, the interesting thing is I just started DD my FD and I found out ONLY when it's about 80F out and after I drive the car 20 mins or so when the water temp gets to 195-200 F, the car boosts perfectly and I start getting boost in lower rpm range like it should even in first gear (but still no full 10psi in 1st ever). and I do eventually get the dip from "10-8-10" so this leads me into thinking what in the turbo control system is temperature dependent and will only work well when the car is hot. Or maybe I have a clogged pre cat? I still have the stock precat for this 94 touring with 110K miles on precat. (sounds like a nightmare)
On a different boost issue though, I know I get no boost at all in first gear and in 2nd there is boost ONLY if i WOT. from 3rd and on boost kicks in between 2000-3000 rpm like it should and I know this could be a faulty TCA solenoid after some research on the forum (bought one from Ray but haven't install). Well, the interesting thing is I just started DD my FD and I found out ONLY when it's about 80F out and after I drive the car 20 mins or so when the water temp gets to 195-200 F, the car boosts perfectly and I start getting boost in lower rpm range like it should even in first gear (but still no full 10psi in 1st ever). and I do eventually get the dip from "10-8-10" so this leads me into thinking what in the turbo control system is temperature dependent and will only work well when the car is hot. Or maybe I have a clogged pre cat? I still have the stock precat for this 94 touring with 110K miles on precat. (sounds like a nightmare)