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Turbo problems?
My car is fully stock and when I romp on it the boost goes to 6-7 psi. But I think I am missing the clowoff valve or the wastegate is broken or something, because the boost stays negitive unless I give it at least half throttle..goes to 0 at half throttle...goes to 4 psi at 3/4 throttle and 6-7 psi at full throttle. I also have nothing from the cat back because the previouse owner took it off. I think I am losing power as I know that these cars need back pressure...unless you are pushing 18+ psi. Is this reading normal or is it off...if so what could be some of the reasons?
-Thanks a bunch, TxSpeedBoy Houston, Tx |
turbo's + backpressure don't require each other
more than likely you may have a small boost leak check all your clamps & intercooler pipes for splits/holes/cracks when on hard throttle do you hear air rushing from the engine bay? |
Yes I do hear rushing, like that's all I can hear. What does that mean?
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make sure ALL of your intercooler pipes are connected well and dont have holes in them ;)
check the pipe coming off the turbo.. that's a common culprit and check the one between the throttlebody and manifold as they commonly split i would say it's only a small leak as she is idling ok isn't she? |
She is idleing ok, but until I put it in drive it idles about 1100-1200 rpms. When in drive she idles 800-900 rmps. She also doesn't start the first time after she's been off for a while. Sometimes it takes as much as 4 attempts. What's the deal with this? I'll check the piping too. I took it to Toyota today and they did a free visual inspection. Everything for the most part is ok, but I need new pads for sure all the way around, and most likely rotors too. Any idea of where the best deal for these are. They wanna charge $151.00 for the front and the same for the back totaling around $300.00 for just the pads...I think. I would like to do them myself, but don't know if I have the know how or the facilities to do so. I checked the oil cam for the chocolate milkshake stuff and none was around the immediate opening, but down in there just looks like oil. I couldn't find the bolts though. Know of any sites that have diagrams? What do I have to take off to get to the bolts? I think it is in the cylinders too on account that I have no cd player so there is a hole there and when I get on it, I can see burnt oil coming out. I am thinking it needs new gaskets and seals. Any advise? Cost predictions?:(
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i though the boost was suposte to stay a negitev at idal
or is it suposte to stay at 0psi at idal |
I went to look at a SRT4 a little bit back before I got my Supra and the guage in it stayed at 0 psi and when I hit the throttle in neutral it went up. On mine, it doesn't move no matter how hard or long you hit the gas.
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it is very rare for the 7mgte to boost in neutral... don't worry about it
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well yes but is it suposte to stay at 0psi at idal or negitev?
caus the one im geitting stays at negitev then only goes to about 5psi. however it seams to run as close to perfect as posable. good stable idal. |
That's good to know. How do I "burp" the cooling system, it sounds like there is air in it.
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it will be in "vacuum" at idle... usually about -20ish on a good engine
burping Quote:
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Quote:
i was getting thinkin that was a bad thing caus most turbocharged cars will stay at 0psi btw sorry for jacking this thred for a lil wile |
most of your turbo cars have vacuum leaks then ;)
usually -18 to -22 is normal if it shows -10 then you have vacuum leaks (more than likely straight of the intake manifold) or (happened to me) bhg... altho that's not common i don't think mine was surging hardcore like it had a major boost leak here's some good info from www.cygnusx1.net http://www.cygnusx1.net/supra/techtip/vacuum.html |
well on the gauge on the one im getting goes from -4 to +8psi
and at idal it always says -4. is this right or is there somthing rong like a leak or somthing? |
yea, mine has the same boost reading and I am wondering the same thing.
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here something to think about. a turbo runs off of exhaust and when the car is started, no exhaust yet but the engine needs air to run. so the engine will suck in air creating a vaccum, thus reading neg boost. once its running and pushing out exhaust making the turbo spin, the gauge will read positive pressure
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well, what about when the car is reved up? My trubo guage does not read uno matter how long you hold the gas down. It only reads when I am going.
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pretty much any turbo car should be pulling vaccum at idle...even cruising at low rpms. ive never ridden in a turbo supra but in a grand national it would hardly get to boost...unless he hit the gas kinda hard. would get to about 0 at normal aceleration. and vaccum while cruising. My car also has that waterfall sound...im guessing thats air trapped in the heater core?
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ahh there's one thing i forgot... what measurement is your vacuum gauge in?
and yes.. burp your car too ;) |
The boost guage reads negitive 4, then 0, then a midway line, then +8. That's it. I tried to figure out how to post a pic, but having trouble.
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ohhhhhhhhhhhh the stock gauge lol
quite normal :) get an aftermarket boost gauge with vacuum... it's extremely helpful in telling you plenty of things... as with my previous post linked to cygnusx1 page :) |
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