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what is the cause of boost backing off if you set your car to run 2 bar and it holds only 1.5 bar after it hits 2 .what causes that .and any way to get it to hold all the way
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Depends if the ECU is trying to bring it back down of course, as obviously if it shuts the amal valve again thats going to cause it.
The other thing of course is the turbo may not be big enough ot manage the boost further up the rev range, as t34's do kind of run out of puff, so is that it s dropping striaght off or trailing off?
The other thing of course is the turbo may not be big enough ot manage the boost further up the rev range, as t34's do kind of run out of puff, so is that it s dropping striaght off or trailing off?
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chip-3door
yes its a t34.48 housing and its got a rs 500 intercoler and i dont run off a amal valve it runs off a bleed valve and a /34 .but ther alot of other with the same spec and the run and hold alot more
yes its a t34.48 housing and its got a rs 500 intercoler and i dont run off a amal valve it runs off a bleed valve and a /34 .but ther alot of other with the same spec and the run and hold alot more
#6
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Possible its something nasty and expensive thats mechanical of course, but fingers crossed it isnt!
Bleed valves arent the greatest idea TBH, they dont really control the wastegate all that well, and the wastegate creep is bad too, which means the gate may not be shut properly making it easier for the boost to force it open
Whats the boost level with the bleed valve shut?
Bleed valves arent the greatest idea TBH, they dont really control the wastegate all that well, and the wastegate creep is bad too, which means the gate may not be shut properly making it easier for the boost to force it open
Whats the boost level with the bleed valve shut?
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#10
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Can still be the jetting using my own terminology as the bleed valve is a jet of forms, its just adjustable, but in escense your right, im just trying to squeeze may way out of a capping
. In this instance, how far away from the turbo the bleed valve is positioned will affect the amount of overshoot you see.
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#12
DEYTUKURJERBS
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Originally Posted by Stu @ M Developments
In this instance, how far away from the turbo the bleed valve is positioned will affect the amount of overshoot you see. ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
I got a bleedvalve coming soon for the S13 drifto shed
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#14
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Originally Posted by Itsmeagain
Originally Posted by Stu @ M Developments
In this instance, how far away from the turbo the bleed valve is positioned will affect the amount of overshoot you see. ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
I got a bleedvalve coming soon for the S13 drifto shed
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#15
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Originally Posted by chip-3door
Originally Posted by Itsmeagain
Originally Posted by Stu @ M Developments
In this instance, how far away from the turbo the bleed valve is positioned will affect the amount of overshoot you see. ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
I got a bleedvalve coming soon for the S13 drifto shed
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
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#16
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Originally Posted by Mike Rainbird
Originally Posted by chip-3door
Originally Posted by Itsmeagain
Originally Posted by Stu @ M Developments
In this instance, how far away from the turbo the bleed valve is positioned will affect the amount of overshoot you see. ![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
![Wink](https://passionford.com/forum/images/smilies/icon_wink.gif)
I got a bleedvalve coming soon for the S13 drifto shed
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Im sure Stu can give one of his nice definitive technical answers later
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#17
DEYTUKURJERBS
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What mike says is to do with length of hose though.
What im asking is a set length of hose, just the positioning of the bleed valve in it.
Ie in right by actuator or right by other end of pipe, or somewhere in between.
What im asking is a set length of hose, just the positioning of the bleed valve in it.
Ie in right by actuator or right by other end of pipe, or somewhere in between.
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Stu @ M Developments
turbo is new .its starts to creep at around 5000 rpm buy the time iam at 6500rpm its holding 1.5 bar .with the bleed valve shut totaly it will hold1.3 bar may be i need to adjust the actuator to hold the wastgate closed for longer
turbo is new .its starts to creep at around 5000 rpm buy the time iam at 6500rpm its holding 1.5 bar .with the bleed valve shut totaly it will hold1.3 bar may be i need to adjust the actuator to hold the wastgate closed for longer
#21
DEYTUKURJERBS
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.63 wont help, more to do with the compressor not being able to flow enough if there no other problems.
If anything a .63 would make the boost drop more as will make the exhaust less restrictive.
If anything a .63 would make the boost drop more as will make the exhaust less restrictive.
#22
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Originally Posted by Itsmeagain
.63 wont help, more to do with the compressor not being able to flow enough if there no other problems.
If anything a .63 would make the boost drop more as will make the exhaust less restrictive.
If anything a .63 would make the boost drop more as will make the exhaust less restrictive.
People focus too much on what boost they are running and not enough on making more power on less boost IMHO (not a dig at the thread poster, just cossie owners in general)
I dont see why cossie owners cant accept that needing 2 bar of boost to not even make 400bhp on a 2.0 16v engine is a BAD thing!
#24
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Originally Posted by bud-weis
itsmeagain;
my point was more that he could make the same power on less boost, say holding 1.5 bar all the way
my point was more that he could make the same power on less boost, say holding 1.5 bar all the way
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