I think my wastegate is bad
#1
Three Wheelin'
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I have been playing with the car off and on for the past couple of weeks as weather permits. One day it is 50 out and the next day it is snowing!
I have a SFR stage 1 turbo with guru chips and a mafterburner. SWhen i first started playing with the car it would hit boost very hard at just below 4,000 RPM's and break the rear end loose. Maximum boost was 15.4 PSI. Now 2 weeks later the car will not boost above 15.4 psi no matter what I do and boost rolls on instead of suddenly hitting like it did before.
I have a stock wastegate that is shimmed and has almost 190,000 miles on it. I would really like to be able to run more than 15 PSI of boost but it appears that the stock wastegate is bleeding by thus not allowing any more boost to build up.
Before I go out and spend $300+ on a tial wastegate i wanted to get other peoples thoughts on what else might be causing the problem.
The cycling valve has been removed and I am currently using a reliaboost to control boost pressure as the solenoid for my profec B failed.
I have a SFR stage 1 turbo with guru chips and a mafterburner. SWhen i first started playing with the car it would hit boost very hard at just below 4,000 RPM's and break the rear end loose. Maximum boost was 15.4 PSI. Now 2 weeks later the car will not boost above 15.4 psi no matter what I do and boost rolls on instead of suddenly hitting like it did before.
I have a stock wastegate that is shimmed and has almost 190,000 miles on it. I would really like to be able to run more than 15 PSI of boost but it appears that the stock wastegate is bleeding by thus not allowing any more boost to build up.
Before I go out and spend $300+ on a tial wastegate i wanted to get other peoples thoughts on what else might be causing the problem.
The cycling valve has been removed and I am currently using a reliaboost to control boost pressure as the solenoid for my profec B failed.
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#2
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Pretty sudden failure.... Maybe a hose is split or loose?
Howd your Profec B's motor fail? On mine I found what I thought was a perfect mounting spot. Then I bent the cable. Half the wires snapped, and the sheath came out of the motor housing. I was pretty choked. Crap design and shoddy harness IMHO.
Edit: Wait, was it Profec before, then Reliaboost and thats when it started acting worse?
Howd your Profec B's motor fail? On mine I found what I thought was a perfect mounting spot. Then I bent the cable. Half the wires snapped, and the sheath came out of the motor housing. I was pretty choked. Crap design and shoddy harness IMHO.
Edit: Wait, was it Profec before, then Reliaboost and thats when it started acting worse?
#3
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I had similar problems dump the stock WG and get a tial 38mm
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/244438-38mm-tial-installed-dyno-chart.html
check post 48 and 49.
https://rennlist.com/forums/944-turbo-and-turbo-s-forum/244438-38mm-tial-installed-dyno-chart.html
check post 48 and 49.
#4
Three Wheelin'
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Lart, will do. Right now though money is pretty tight. When the company I was working for did not renew my contract I went from making $80,000+ tax free to now making $8.00 an hour!
Brian, as far as the profec B failure goes A piece ofthe plunger inside the solenoid broke off and now it allows boost to get through all the time. As soon as the state of New york decides to return the money it owes me I am going to get a new solenoid and hopefully a tial.
Brian, as far as the profec B failure goes A piece ofthe plunger inside the solenoid broke off and now it allows boost to get through all the time. As soon as the state of New york decides to return the money it owes me I am going to get a new solenoid and hopefully a tial.
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I'm new to 951's and don't have any advice on your problem but I am sorry to hear about your job situation. My police department closed if you can believe that crap. I also took a pay cut but luckily got hired on by another department. Good luck to you.
#10
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Originally Posted by david fracolli
Lart, will do. Right now though money is pretty tight. When the company I was working for did not renew my contract I went from making $80,000+ tax free to now making $8.00 an hour!
Brian, as far as the profec B failure goes A piece ofthe plunger inside the solenoid broke off and now it allows boost to get through all the time. As soon as the state of New york decides to return the money it owes me I am going to get a new solenoid and hopefully a tial.
Brian, as far as the profec B failure goes A piece ofthe plunger inside the solenoid broke off and now it allows boost to get through all the time. As soon as the state of New york decides to return the money it owes me I am going to get a new solenoid and hopefully a tial.
#11
Three Wheelin'
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It is supposed to get up to the mid 40's today so i think I am going to jack the car up and check for exhaust leaks. i really doupt that I have any large one but I guess it can't hurt to check it out.
Thanks agin everyone!
Thanks agin everyone!
#12
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Originally Posted by david fracolli
I replaced all the hoses when I installed the new turbo and had the head rebuilt. Vacuum at idle when warm is -.80 to -.82 PSI.
Negative PSI? What gauge are you using? Vaccum is usually measured in Inches of Mercury (InHg).
If you are confident that your hoses are good, look at the wastegate.
#14
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the reliaboost may not be strong enough either. I have mine cranked pretty far and I am hitting 15 psi. I would take the reliaboost apart and either change the spring or stretch it a bit and see how that works first.