input on boost problem
input on boost problem
I'm trying to sort out why my car will hit 16 psi around 3700 then around 4300 it will go up to 17.5 then drop off around 5700 back to around 16-15 psi.
this happened on both stock wastegate and mbc.
Is this a sign for a new turbo.
this happened on both stock wastegate and mbc.
Is this a sign for a new turbo.
38k, cams, turbo back exhaust, aem ems.
if its boost leak why would it have less boost then increase boost.
I had boost leak before and I would hit fuel cut from too much flow on the maf
if its boost leak why would it have less boost then increase boost.
I had boost leak before and I would hit fuel cut from too much flow on the maf
Originally Posted by awddyno
38k, cams, turbo back exhaust, aem ems.
if its boost leak why would it have less boost then increase boost.
I had boost leak before and I would hit fuel cut from too much flow on the maf
if its boost leak why would it have less boost then increase boost.
I had boost leak before and I would hit fuel cut from too much flow on the maf
I agree with evodemon. We will need to know how what the car did before and what was changed between now and then. IMHO I would not think you would need a turbo at that milage unless it was faulty, there was a failure, or you have had it overworking making high boost...
it never hit 19psi, I bought the car with a hks bov and megan manifold and a welded cheap *** muffler, got rid of that one quick.
I took off all the pipings since and re-installed back and made sure not to leak, bov set screw is all the way in,(purpose--to hold the boost).
I took off all the pipings since and re-installed back and made sure not to leak, bov set screw is all the way in,(purpose--to hold the boost).
Just curious...what gear(s) are you testing the boost in?
Which MBC are you running?
How is the MBC installed (to which lines/ports)?
What setting do you have the MBC adjusted to?
This is a lot to talk about on here. It might be easier to try to find someone knowledgeable (and helpful) on here who lives up your way and can stop by to check it out...
Which MBC are you running?
How is the MBC installed (to which lines/ports)?
What setting do you have the MBC adjusted to?
This is a lot to talk about on here. It might be easier to try to find someone knowledgeable (and helpful) on here who lives up your way and can stop by to check it out...
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3rd and 4th, all the usual stuff I checked, my last one to check is a pin hole in the intercooler or leaking bov,
even at 18 to 20 psi boost level, it does the same graph, 18 then 20 then 18 and lower.
its got good power but if boost is stable, could get more, all my test are done on dyno btw.
even at 18 to 20 psi boost level, it does the same graph, 18 then 20 then 18 and lower.
its got good power but if boost is stable, could get more, all my test are done on dyno btw.
So you are saying that it's not the boost pressure itself that is at issue here, its the boost pressure pattern over the RPM range...up to peak then trailing off? That is what the boost does on the car from the factory. Up to 19 then back down to 16...
Does you MBC use non-factory vacuum hoses, or is it using the stock hoses with the "boost pill" intact?
Does you MBC use non-factory vacuum hoses, or is it using the stock hoses with the "boost pill" intact?
no no no, look again,
It will hit 16 then go up to 17 then down again, not peak then down.
it will hit the peak I set it for then pass it then back down again.
no boost pill, I'm currently testing some line restrictor and hose reducers to see.
thanks for the reply, I've had a fair number of boost problems, this is a new one to me,
I guess new to others too.
It will hit 16 then go up to 17 then down again, not peak then down.
it will hit the peak I set it for then pass it then back down again.
no boost pill, I'm currently testing some line restrictor and hose reducers to see.
thanks for the reply, I've had a fair number of boost problems, this is a new one to me,
I guess new to others too.
I see.
I think you are saying you see boost spikes over the "max" setting of your boost controller. I don't know what king of BC you are running, but several things can cause that. Like using the turbo compressor nipple as your boost controller's boost source instead of the intake manifold side.
If that's not it, then unfortunately I don't understand the issue and cannot help further.
Best of luck...
I think you are saying you see boost spikes over the "max" setting of your boost controller. I don't know what king of BC you are running, but several things can cause that. Like using the turbo compressor nipple as your boost controller's boost source instead of the intake manifold side.
If that's not it, then unfortunately I don't understand the issue and cannot help further.
Best of luck...
FYI - Here is a related quote from the Hallman MBC install thread...looks like I may have had my thoughts backwards...sorry about that.
Originally Posted by burningmoney97
Here are the pros and cons of both hook-ups
1. Hooking it up the compressor outlet nipple:
A. This way gives you less spikes but slower spool up.
B. It does not seem to give repeatable boost. It seems
to fluctuate more with the temperature.
C. Boost seems to be harder to control below 15 psi or
above 22 psi. Almost everyone who wrote me
said this.
D. It is easier to hook up this way. No cutting any
boost lines. Plus the lines are kept shorter.
(Thus the less spikes).
2. Hooking it to the hose between the BOV and the intake:
A. This way seems to give slightly faster spool up than
the other way.
B. It gives more repeatable boost. It doesn't seem to
fluctuate as much with temperature differences.
C. The boost seems to be more controllable down to
stock turbo levels. (Like down to 7 or 8 psi for a 1G
with a stock 14B turbo).
D. It is more work to hook up. You have to cut the hose
between the BOV and intake and tee it in. (Not
that this is hard, its just an extra step so I put it
in here)
E. Both Hallman and Extreme tell you to do it this way
1. Hooking it up the compressor outlet nipple:
A. This way gives you less spikes but slower spool up.
B. It does not seem to give repeatable boost. It seems
to fluctuate more with the temperature.
C. Boost seems to be harder to control below 15 psi or
above 22 psi. Almost everyone who wrote me
said this.
D. It is easier to hook up this way. No cutting any
boost lines. Plus the lines are kept shorter.
(Thus the less spikes).
2. Hooking it to the hose between the BOV and the intake:
A. This way seems to give slightly faster spool up than
the other way.
B. It gives more repeatable boost. It doesn't seem to
fluctuate as much with temperature differences.
C. The boost seems to be more controllable down to
stock turbo levels. (Like down to 7 or 8 psi for a 1G
with a stock 14B turbo).
D. It is more work to hook up. You have to cut the hose
between the BOV and intake and tee it in. (Not
that this is hard, its just an extra step so I put it
in here)
E. Both Hallman and Extreme tell you to do it this way
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