black240sx96
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39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 12:20 PM 5/16/2008 |
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anyone?
 SPHINX
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s13point5
Offline
380 posts
89 240sx
At Home broke
3-3-2006
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 1:21 PM 5/16/2008 |
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how are you checking for leaks? are you just doing a visual test?
 89 240sx - RB25DET
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (s13point5) | 1:26 PM 5/16/2008 |
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| Quote, originally posted by s13point5 » | | how are you checking for leaks? are you just doing a visual test? |
carb cleaner....
SPHINX
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 2:42 PM 5/16/2008 |
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come on people seriously....no one has ever come across this problem??? EVER ??????? 
SPHINX
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rogoman
Offline
781 posts
1991 240SX FB
2-17-2006
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 2:46 PM 5/16/2008 |
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Several things to check:
- Run a pressure test on the hot pipe system. Disconnect the piping at the turbo and at the throttle body. Cap off both ends. One of the caps would have a pressure gauge and an air valve stem to apply air. Pressurize the system and watch the gauge; there should be no leakdown.
- Attach a vacuum gauge to the hot pipe. While motor is idling, measure the vacuum. The reading should be around 18-20 InHg.
- Make sure blow-off valve and waste gate is working correctly.
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (rogoman) | 2:54 PM 5/16/2008 |
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| Quote, originally posted by rogoman » | Several things to check:
- Run a pressure test on the hot pipe system. Disconnect the piping at the turbo and at the throttle body. Cap off both ends. One of the caps would have a pressure gauge and an air valve stem to apply air. Pressurize the system and watch the gauge; there should be no leakdown.
- Attach a vacuum gauge to the hot pipe. While motor is idling, measure the vacuum. The reading should be around 18-20 InHg.
- Make sure blow-off valve and waste gate is working correctly. |
i will make sure to try that...also i just noticed 2 mins ago that my BOV (which is an ebay type RS "greddy"....  ) only have one nipple but the real greddy has two one on the top and one under thats at about a 45deg angle....i feel air getting sucked through there now which i never noticed or heard before....i put my finger there to block it but i didnt notice a change.....and i dont happen to have another one laying around and i dont wanna buy one just in case its not the problem...how and i check to see if thats the problem or not???
SPHINX
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Rucca
Offline
223 posts
Newark DE
7-19-2007
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 3:40 PM 5/16/2008 |
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See if your blowoff valve is leaking air out when it should be holding boost
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rogoman
Offline
781 posts
1991 240SX FB
2-17-2006
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 3:49 PM 5/16/2008 |
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| Quote, originally posted by black240sx96 » |
and i dont happen to have another one laying around and i dont wanna buy one just in case its not the problem...how and i check to see if thats the problem or not??? |
Read my post about using a vacuum gauge. Read the gauge while pushing on the BOV; if the reading changes a lot, the BOV is leaking.
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black240sx96
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39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ | 4:50 PM 5/17/2008 |
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brand spanking new greddy type rs just installed an the car runs well under vacuum but once i hit boost or try to hit boost it started to studder again....any suggestions
SPHINX
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 6:04 PM 5/19/2008 |
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Here is a video of whats going on...if you turn it up you can here the misfiring of lack of power boost the whole car sucks....lol
SPHINX
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Chukidori
Offline
707 posts
Elmore Al
4-14-2007
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 6:48 PM 5/19/2008 |
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That bov is most def the problem.If it is sucking in Air through the BOV..Then that is UNMETERED AIR which your Airflow sensor has NOT accounted for, therefore your air/fuel ratio is going to be ****ED because the engine is getting more air than the computer is reading, and its mixing the improper amount of fuel.
"40 years ago that interstate didint exist, The road didint cut through the land like that interstate. It moved with the land, It rose and fell and curved....and people didnt drive on it to make great time, they drove on it to have a great time"
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (Chukidori) | 8:17 PM 5/19/2008 |
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| Quote, originally posted by Chukidori » | | That bov is most def the problem. If it is sucking in Air through the BOV..Then that is UNMETERED AIR which your Airflow sensor has NOT accounted for, therefore your air/fuel ratio is going to be ****ED because the engine is getting more air than the computer is reading, and its mixing the improper amount of fuel. |
i want to agree but the fact is that i just put the bov not but 2 days before the video....brand new....i replaced my old one.....and still i get this problem
Modified by black240sx96 at 6:01 AM 5/20/2008
SPHINX
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nori927
Offline
5 posts
240sx
huber heights oh
5-15-2008
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 9:06 PM 5/19/2008 |
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ur car is doing same thing as mine is, but i cant tell you what it is because im having problem with mine still and im having people from forced fab and ruckus racing helping me, but if i find out ill let you know
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (nori927) | 9:09 PM 5/19/2008 |
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| Quote, originally posted by nori927 » | | ur car is doing same thing as mine is, but i cant tell you what it is because im having problem with mine still and im having people from forced fab and ruckus racing helping me, but if i find out ill let you know |
you would be a life saver cuz i had a shop look at it and they couldnt figure it out....i was kinda pissed that they charged me $60 but screw it i wont take my car back to them.let me know plz....thanks
SPHINX
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black240sx96
Offline
39 posts
cars girls motorcycles and bmx freestyle
Somewhere Fl
10-16-2002
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| « Re: S14 SR20DET CANT BOOST!!!! WTF? NEED HELP PLZZZZ (black240sx96) | 6:37 AM 5/20/2008 |
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bump ?!?!
SPHINX
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im lost now and i have no idea where to go from this.