Shane.Trammell

A friends fd with a street port and BNR stage 2s is having problems. Its got all the mods that it needs to support the upgrades like PFC, injectors, fp, fmic, etc. I think he is running the turbos non sequentially. He has no emissions.



Ok with all of that said here is the problem he is having. He is not reaching full boost (1 bar) until about 4900 rpms and it sounds like there is a leak while it is spooling. Possibly related is the warm up idle surging like so many others are experiencing. Do you guys think there could be a vacuum leak that is causing the boost leak and the surging? He says that the surging has been happening since before he had the port and the turbos.



If you guys need more info just ask and ill post it up, i didnt know what all you guys would need to know and i didnt want to go on forever.







thanks for the help in advance

DUB

pop the hood and rev the car...listen for leaks.



not sure what you are looking for here?



yes, boost leak will build boost slower and crazy idle if it's after the TB.

Shane.Trammell

we listened for leaks, its not the bov for sure. its hard to hear the leaking sound while under the hood bc of all the other noises. you can hear it while in the car. its also hard to hear bc the boost wont stay on for long while just revving the car.



we also put some soapy water on the ic piping couplers to see if they were leaking but they werent.





would we be able to hear a leak from the stock wastegate?

cjr

how erratic is the idle from say 500 to 1500 would be an air leak after tb. from 800 to 1200 would be normal. How are the dump valves plumbed in? these figures cover a large area but will answer if the leak is before or after the tb

Shane.Trammell

im not sure of the exact rpm numbers, but it goes pretty high, like up to 2k or so so i guess its after the tb. i dont know how the dump valves are plumbed in and honestly have never heard of a dump valve so clue me in a little and ill try to find out.





under vacuum we should be able to do the starter fluid method for find the leak right?

Shane.Trammell

going to look for the leak today, will it make a difference if the car is warmed up and not surging when we spray the starter fluid?

jgarza77

[quote name='Shane.Trammell' date='Jul 26 2005, 01:00 PM']going to look for the leak today, will it make a difference if the car is warmed up and not surging when we spray the starter fluid?


[/quote]

how bout trying it with WD-40, with the starter fluid/ether being as unpredictably flammable wouldnt it be a high risk of fire??? also if ingested wouldnt it cause a sudden lean or detonation? with the WD-40 it would at least lubricate simultanously if ingested? I may be wrong but, just a thought.......... maybe Im just overly cautious

Shane.Trammell

wd 40 doesnt lubricate and i think that it may cause more of a fire risk than starter fluid. starter fluid dries and loses its flammability, but i think that wd-40 would stay and remain flammable.



also, wouldnt the fluid cause a sudden rich mixture, not a lean one?

cjr

det at idle won't realy happen the revs with rise or it will stall out. I use brake fluid cleaner it burns real well. if all nipple's are covered it really only leaves on place ofter the tb for an air leak. That would be the inlet manifold gasket. typing that i have thought off quite a few more. But rare causes. Injector O rings, sticking throttle( gets the tps just out off idle range)

jgarza77

[quote name='Shane.Trammell' date='Jul 26 2005, 01:27 PM']wd 40 doesnt lubricate and i think that it may cause more of a fire risk than starter fluid. starter fluid dries and loses its flammability, but i think that wd-40 would stay and remain flammable.



also, wouldnt the fluid cause a sudden rich mixture, not a lean one?


[/quote]

like I said, "just a thought"......just figured WD-40 seems oily, post your finds