low boost psi please help
#1
low boost psi please help
Hey guys I just bought my 97 Audi a4 b5 1.8t aeb engine code about a month ago decided to put a boost gauge in about a week ago so I did and upon start up my vac is around -20 to around -22 then driving apon hard acceleration the most is 2 psi boost but the car seems to run great and doesnt really seem sluggish its not the.fastest car ever but there is no strange noises either I made my own boost leak tester and found a hole in the intercooler and I fixed it and I still have the same problem I also took the top.line off the n75 valve and that never helped I'm lost and really hoping its not the wastgate but I don't think it is being there isn't a noise any help I would greatly appreciate I think ill check my dv valve tomorrow but I have no idea what's wrong
#2
guessing its the wastegate. youll have to grab the actuating rod. if you can move it with your hand than the diaprham is bad. the thing is wastegate pressure on a k03 is 4psi, which means taking all other systems besides the wastegate into consideration, youll make 4 psi. the fact you are only making 2 psi almost assuredly means you have either a bad wastegate actuator, or there is an issue with your flap.
edit- ok forgot about the diverter valve. if it was the dv, it would pretty much need to be completely shot. either way, youll need to check out both systems. if you need parts, let me know. i got plenty of extras laying around
edit- ok forgot about the diverter valve. if it was the dv, it would pretty much need to be completely shot. either way, youll need to check out both systems. if you need parts, let me know. i got plenty of extras laying around
Last edited by redline380; 04-07-2013 at 03:10 AM.
#5
if you want a new turbo, you are best off buying genuine BorgWarner. second best option is getting yours rebuilt, or if you want a performance upgrade have yours modified. third best option is buying a used, genuine BorgWarner. those should be your only options.
as for the diverter valve, if you are just running stock programming, just run a stock diverter valve. a forge unit wont offer any extra performance, or any other aftermarket brand for that matter. if you want a cheap upgrade, get a tt225 dv. you could get a forge unit, and in the end it will be a bit more reliable in long run i guess, but im kinda pissed at forge since my blow off valve is sticking open sometimes. even after i greased it up.
so, stick with some sort of BorgWarner turbo, and just get a new diverter valve, unless you feel the extra cash for a forge is worth it
#6
Ok I got ya lol sorry I'm new to this in the morning I will deff see if there is any play in the rod and check the dv I hope its nothing major and doesn't cost a lot the weird thing is the car runs good and just to clear things up that rod is the one you can see looking down by the air intake that's on the turbo right and if I can move it its bad
#8
as for the rod, i couldnt tell you where its located in relation. its been a while since i seen a stock turbo under my hood but your description sounds accurate. its just a round coming from a round thing (the wastegate diaphram. there will be a vacuum/boost line) going to a swivel connector, which connects to the wastegate flapper. and yes, if it you can move it somewhat easily, it is bad. as for the diverter valve, youll need to pretty much take it out. i want you to (this may sound dirty) suck on the nipple with your finger up the hole and feel if the piston is moving easily. if it is moving with little sucking, that may be bad. and dont be alarmed if a milky residue comes from the diverter valve. thats normal (true, but i added that part for laughs)