Weak Primary T Boost and Overboost on Secondary T ?????
03-07-02, 11:34 AM
#1
Rotary Freak
Thread Starter
Weak Primary T Boost and Overboost on Secondary T ?????
I have a weird problem. My first turbo spools up really slowly. I mean my boost patterns are like:
3000 rpm 5-6 psi
4500 rpm 10 psi
4500 rpm 14-15! psi
*And yes, I did get a Profec B to control boost. But, I'm not sure it's working But that another issue (See my other post)
What can be causing this?? How can I be getting such crappy primary boost and overboost to scary proportions on the secondary turbo?
Any ideas? I thought you had to have a working primary to have the secondary to work....
3000 rpm 5-6 psi
4500 rpm 10 psi
4500 rpm 14-15! psi
*And yes, I did get a Profec B to control boost. But, I'm not sure it's working But that another issue (See my other post)
What can be causing this?? How can I be getting such crappy primary boost and overboost to scary proportions on the secondary turbo?
Any ideas? I thought you had to have a working primary to have the secondary to work....
03-07-02, 11:54 AM
#2
Ex fd *****
sounds like a stuck turbo controll valve causing NON-SEQUENTIAL opperation and/or inmproper hook up of turbo control valve, wastegate control, and turbo pre-controll.
03-07-02, 02:12 PM
#4
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Might be the M2 ECU, I noticed you have one as wll, I'm experiencing the same boost patterns. It acts more like a non-sequential or single.
This only hold true for me though in lower gears....when I get to 5th gear I can get the full 13psi at 3000rpm.
I'm running the M2 ECU with a DP,MP,CB,FMIC, and Intake...but I don't have the ProfecB.
This only hold true for me though in lower gears....when I get to 5th gear I can get the full 13psi at 3000rpm.
I'm running the M2 ECU with a DP,MP,CB,FMIC, and Intake...but I don't have the ProfecB.
03-07-02, 02:31 PM
#5
Rotary Freak
Thread Starter
Originally posted by Pressurized
Might be the M2 ECU, I noticed you have one as wll, I'm experiencing the same boost patterns. It acts more like a non-sequential or single.
Pressurized,
This only hold true for me though in lower gears....when I get to 5th gear I can get the full 13psi at 3000rpm.
I'm running the M2 ECU with a DP,MP,CB,FMIC, and Intake...but I don't have the ProfecB.
Might be the M2 ECU, I noticed you have one as wll, I'm experiencing the same boost patterns. It acts more like a non-sequential or single.
Pressurized,
This only hold true for me though in lower gears....when I get to 5th gear I can get the full 13psi at 3000rpm.
I'm running the M2 ECU with a DP,MP,CB,FMIC, and Intake...but I don't have the ProfecB.
Now I'm trying to controll the boost spikes with a used Profec B. But I don't think I have it installed correctly. No effect!
??? Aren't you worried about overboosting???
03-07-02, 02:46 PM
#6
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Well, if you figure out what's wrong, post it on here because my boost pattern has been all over hell.
I had the original 13-13-13, but then I started adding parts.....ever since the FMIC, I haven't been able to get a normal pattern.
I mean, I really don't mind the pattern, it's like being non-sequential....but it just bothers me that I don't know why it's like that.
As for overboosting, I'm not worried at the moment. The M2 has very rich maps, and I'm running a restrictor plate to keep it from creeping too high. I'm thinking about trying a 'pop-off valve' as well.
If I ever get the time I'm going to convert to non-sequential anyways.
I had the original 13-13-13, but then I started adding parts.....ever since the FMIC, I haven't been able to get a normal pattern.
I mean, I really don't mind the pattern, it's like being non-sequential....but it just bothers me that I don't know why it's like that.
As for overboosting, I'm not worried at the moment. The M2 has very rich maps, and I'm running a restrictor plate to keep it from creeping too high. I'm thinking about trying a 'pop-off valve' as well.
If I ever get the time I'm going to convert to non-sequential anyways.
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