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Old 05-21-2003, 04:34 PM   #1
boosteduuarex
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1969 Datsun SRL 311
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Angry Help Im loosing boost, and dont know why.

HELP ME SOMEONE PLEASE!!!!
Dont know what happened.
Yesterday and all month before yesterday I had my dual stage MBC set to low 10psi and high 14.5 psi
today I get in the car to come to work at 5:30 AM ouch...
and I am getting about 7psi and about 10psi now. I didn't touch anything, and now I cant figure out what went wrong.
Anyone else have this problem?
Any ideas???

I am getting sick of all the problems with this damn car, and if I cant fix this without too much of a pain I am going to sell this thing. So far in my experience this car is a fun, fast, great handling car, but it definitely has a glass jaw. The tranny sucks, the clutch sucks, the radiator sucks, and subaru wont back up their products at all. Modded or not!!! How many times have you heard... "warranty work denied due to over aggressive driving" I thought this was a street leagle rally car.?.?.?. I never launch it, or drag race, and it is still falling appart!!!
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Old 05-21-2003, 04:42 PM   #2
gjhsu
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It's a street legal rally inspired car, but by no means a rally car on the streets.

As for the boost problem, maybe the MBC is tripping up the wastegate somehow, though I doubt it, or maybe the MBC spring is worn and is letting boost out early? That would be my guess.

FWIW, I'm at 10,600 and no problems whatsoever, knock on wood, and it's bone stock. Maybe it's true, you pay to play.
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Old 05-21-2003, 04:49 PM   #3
boosteduuarex
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Just so you know...
14000 miles
MRT turbo back + Up pipe
SAFC
Turbo xs dual stage MBC
GFB 60/40 BOV
Perin sway bars 22-24mm
Cusco strut tower bars
Perin rear end links and mounts
MRT front end links.
Lots of gauges
turbo timer

and lots of problems with the car...
It is fast as poop when it works though.
When it works is the problem...
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Old 05-21-2003, 04:58 PM   #4
wickedwrx
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One of the problem with ball and spring type boost controllers and even some eletronic ones is weather/temperature changes the amount of boost and from time to time they need to be adjusted. I agree with gjhsu though I think it is most likley the spring. Try tighten the MBC till you get the desired boost then if you slowly start to loose boost again over the next couple of weeks you know it is the spring. No big deal. If that is all that is wrong calm down I have had much worse stuff go wrong with a car.
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Old 05-22-2003, 07:23 AM   #5
boosteduuarex
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Me too...
I have had much worse things go wrong with a car...
This car is one that has had much worse problems, and with 14000 miles it shouldn't be having any. That is why I am getting closer and closer to going back to Mitsubishi. My 400 hp eclipse had almost no problems for 80000 miles. Then some BIT H in a $500 car ran a red and totaled it.
Dont get me wrong I love driving my wagon, but if I keep having problems, Im gonna get rid of it, and buy an EVO, or S2000.
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Old 05-23-2003, 02:12 PM   #6
boosteduuarex
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Well here is the latest update on my boost problems...
Yesterday I turned the boost up again to about 14 psi on the high setting, and it was better, but still not quite right.
This morning I get in the car and the low boost setting is hitting 13 psi the car is running great, I flicked the switch to high, and the boost spiked at about 18 psi in 2nd. Obviously whatever reason made me loose boost in the first place, had fixed itself. Well maybe not fixed, but whatever it was was not happening any more. Any ideas why this would happen. something got clogged, and isnt now... Who knows.

Anyone have any ideas?

Car seems to be fine now. today at least...
Still taking it off the road for some mantinence on Sunday, and checking everything. If you think I should check something in particular please let me know...
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Old 05-23-2003, 02:18 PM   #7
WRXMikeH
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Besides the temperature change, the only thing that it might have been is a boost leak. You might want to check into getting some higher quality parts on your car if you keep having problems. A friend of mine is upset with his car because of all the cheap parts he put on it; you get what you pay for.
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Old 05-23-2003, 02:35 PM   #8
boosteduuarex
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temperature change wouldnt cause a 3-5 psi drop would it.
Would you consider Turbo XS as cheap of bad parts?
How about Full MRT exhaust?
GFB BOV? They certainly didn't cost cheap.
If these are bad, parts (obviously not cheap), then what should I have gotten?
I wanted to get the best or at least close to it...
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Old 05-23-2003, 03:15 PM   #9
WRXMikeH
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How much the temperature change affects things depends on the boost controller. I've seen about a 2 psi fluctuation in mine over about a 40 degree temp change.

Those aren't bad parts really. The TXS MBC isn't as advanced as say, a Blitz SBC-id, but it's not bad. Within reason, you can expect lower performance and reliability out of the cheaper parts.
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Old 05-23-2003, 08:11 PM   #10
WRXzard
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Verify that there are no leaks. The boost is controlled by the amount of pressure that is diverted away from the waste gate. If no pressure is diverted the wastegate will open and minmize the amount of boost that is generated.

If the pressure is diverted away from the wastegate (via BS opening) boost increases.

If pressure is allow to the wastagate (BS closed) it will force open the spring and boost level is maintained or decreased.

Try to give control back to your ECU. Start isolating your trouble.
Check and see it you have spikes. If you spike that can be an indication of some sort of leak.

Try to go back to stock. Remove your MBC and give control back to your ECU.

Remember when you use a MBC the ECU has a hard time maintaining boost. The ECU has set boost parameters that it tries to meet. If you trying to keep it at 10 psi and its trying to make 13 psi it's going to scale back on the solenoid and its going to remain off in order to build up boost, at that point its thinks something is wrong. You will be surprised at the different maps that are used by the ECU to maintain boost.

Your solenoid could be toast and has shorted out and the only thing that your using to control boost is the wastegate spring.

Personally I think the MBC should not be used constantly. The ECU want to have full controll over boost and tries to do everything to maintain the coded boost level. When we place the MBC into the circuit it create probelms in the system. I think it wears out the solenoid. But then that 's just me.

Hope that helps in understanding whats going on.

my cyber .02$ (Its not legal tender)

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Old 05-23-2003, 09:55 PM   #11
Infymus
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Sorry you're having so many probs with your car. Mine's got 13k miles on it now and I haven't had a single prob.

Then again all I've done is removed the silencer and put in a K&N filter, Cobb Cat-Back and Cobb ECU Stage 1. I'm happy with the horsepower and haven't had a single problem.
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Old 05-24-2003, 01:46 PM   #12
AndreWRX
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Any car you start to modify will break if not set up correctly. I have 34k miles and 293whp and not even so much as a lightblub burning out. But in order to achieve this I had the professionals at pruvenperformance.com tune the car. I always feel that messing with boost and tuning yourself without access to a Dyno is going in blind.
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Old 05-24-2003, 06:37 PM   #13
el~sharko
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How can you blame subaru, for a turboXS product failing? I also find it amusing when people mod there cars and something goes wrong having to do with they're mods. and complain about reliability. How often do you here of stock wrx's having serious problems, sure there are a few, but no more than any other car.
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Old 05-24-2003, 08:27 PM   #14
blaznasn
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did you add, mess with, or change anything before the problem started, that might help us help you diagnose the prob. like a day or week before?
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Old 05-26-2003, 08:05 AM   #15
boosteduuarex
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As I said before the car is working fine again... Dont have any idea why it didn't or why it is now.
I have not done anything to the car in recent months. No problems of this type before.

el~sharko... I am not blaming Subaru for the turbo XS product... I do blame them for the Leaking radiator, the shuddering clutch, the shot wheel bearings, mysteriously vanishing oil, and a bunch of dealers who don't want to fix any of it on warranty.
At this point I'm thinking the TXS boost controler may not be the problem anyway. Who knows with a list this long on a brand new car. Everything is suspect.

I know you all seem to think it is my fault for some reason, and I dont understand why you would think that. Especially seeing the number of people who are having problems with there cars on this site. I am going to switch the boost control back to stock, and think about selling, before something more catastrophic happens. Bottem line is I dont trust that this car anymore. I love driving it. Its all the things I look for in a car, accept reliable...

If the dealers would step up and fix the problems that aren't due to mods, I might feel a bit better about the car, but so far I have met nothing but ressistance from any dealer in my area.
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Old 05-26-2003, 11:32 AM   #16
gjhsu
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We think, in some part anyway, that it is your fault because, generally, people having problems with boost leaks, or drivetrain problems often have mods done to the car, even if it is just an uppipe. As soon as you start messing with something that was not designed in mind, you are messing with the integrity of the car. The transmission, for example, is a trusty one that has worked for Subaru for years. It's just not as over-engineered as, say, a Honda tranny or other such "bulletproof" ones.

I know it's tempting to mod the car, but just expect to run into more problems than someone with a bone stock car.
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