boost

[9DSX_DRVR]

Here is the problem. I just got my car back from the shop and the car was working great. It would rev up and got to about 9lbs of boost. When I got the car home I took some of my ugly black vacuum lines and replaced them with "nice looking" blue vacum lines(maybe this is my problem). Anyway the car was working fine when the temp outside was below 20 degrees. But now when I get into boost it hesitates or doesn't rev up. While I am cruising I can go up to 60-80mph doesn't matter as long as I don't go into boost. I think I am not sure but the new hoses (they are going from TB to canister and canister to BOV) are collapsing when I go under boost. Since the problem came after it got warm outside and the hoses are now soft. Could this be the problem or is it just a coincidence that I changed the hoses?

I can do a search but I'm not sure what "key word" to put in the search. So, r240na flame me all you want. I dont have as much time to go on the internet. I sneek in a min or 2 during my breaks and thats about it.

[S13 Charlie]

Your lines can't be collapsing while in boost, think about it. Boost = positive pressure not vacuum, if anything they would expand. Anyway, If the only change you made was adding new vac lines, then they're probably the cause of your problem. Something doesn't sound right about the way you routed the lines though. Assuming that this is an S13 SR (I don't know about S14/15), there should be 3 vac ports on the intake manifold one small and one large above the thottle body, and one small one below the throttle body. The large port should connect directly to the canister. One of the small ports should connect directly to the BOV, and the other small port goes to the fuel pressure regulator.

http://img442.imageshack.us/img442/9843/boostgaugevaclinehx9.th.jpg (http://img442.imageshack.us/my.php?image=boostgaugevaclinehx9.jpg)

I'm not sure if this picture helps, but here you see one of the small vac lines that goes to the FPR - it's T'd to send a signal to my boost gauge. Behind the vacuum T, is a bolt that plugs up the hose that is supposed to go to the canister. (I don't have a canister anymore)

[9DSX_DRVR]

I changed everything back the way it was when it was running great.

I changed the fuel filter incase it was clogged.

1st gear is pretty strong. But, if I rev high in 2-4 and get past 5lbs of boost it cuts out like its not getting fuel. Also when I am cruising in 5th gear 70+ mph and then push the gas down it will "buck" on me. If I ease into the throttle and don't go past 3lbs of boost I can cruise 90+ mph at vacuum.

[McRussellPants]

Vacuum leak.

find it.

[9DSX_DRVR]

Vacuum leak.

find it.

Thanks.
Thats what I suspected at 1st,but, at a few minutes glance I didn't see any hoses loose.

I will spend some time Sat morn looking for a leak.

[9DSX_DRVR]

[QUOTE=S13 Charlie]Your lines can't be collapsing while in boost, think about it. Boost = positive pressure not vacuum, if anything they would expand. Anyway, If the only change you made was adding new vac lines, then they're probably the cause of your problem. Something doesn't sound right about the way you routed the lines though. Assuming that this is an S13 SR (I don't know about S14/15), there should be 3 vac ports on the intake manifold one small and one large above the thottle body, and one small one below the throttle body. The large port should connect directly to the canister. One of the small ports should connect directly to the BOV, and the other small port goes to the fuel pressure regulator.

Well an engine is one big air pump. It sucks air on one end (or ends) while blowing out the other. So while the turbo is creating boost (indicated on you guage), the rest of the engine will be creating a vacuum (not on guage) on the vacuum hoses. I could be wrong.

Either way.
1. I took the old hoses and inspected for cracks. Put an air pump on them to make
sure there were no holes and then, I put the old hoses back on the way they
were. They are attached just like you like you discribed above.
2. I had recirculated the BOV back into the intake (stock location) and then took it off
and it made no difference.
3. I also change the fuel filter. (may have been dirty)

So it still will not fully boost.

Any suggestion would be appreciated

[projectRDM]

I can't find anything to flame you about, other than you kept the canister in place. I would have removed it.

You're trying to hard to be smart, stop it.

[DJ_Sunrise]

that wierd as bucking and popping in my experience = boost leak. take a look around.. even if shit LOOKS tight, and FEELS tight.. something aint.. take a look at your hose clamps.. hell while you're at it, order up some nice 4 ply silicone couplings and spring loaded t-bolt clamps.. you'll thank me haha

-Bart

[9DSX_DRVR]

that wierd as bucking and popping in my experience = boost leak. take a look around.. even if shit LOOKS tight, and FEELS tight.. something aint.. take a look at your hose clamps.. hell while you're at it, order up some nice 4 ply silicone couplings and spring loaded t-bolt clamps.. you'll thank me haha

-Bart

It ran great after I got it home from the local performance shop. When I changed out the vacuum lines thats when it started. So I didn't think it would have been the turbo or piping. But, it could have been just a coincidence that they happened at the same time. When you say "hose clamps" are you talking about the IC piping or vacuum hoses. Because I put new clamps on all the vacuum hoses. I have brand new couplings on my intercooler piping. Here is a pic.
http://i86.photobucket.com/albums/k83/tonyelkin1/my240engine.jpg
I don't know if you can tell from it.
I will look at them and see if one of them got loose. Thanks

R240NA thanks. The canister was taken out by me at first. But, the local performance shop told me to bring it to them and they put it back in. Maybe for emission inspection. I am not sure. But, it wouldn't bother me to take it out. Would it help in performance to take it out?