no downpipe , bad idel!!!!!!

[dsun87]

ok i just finished putting in my turbo
everything is in the right place and everything is tight as it can be
i have no downpipe and i have a bad idel!!! and it slow as HELLL!!!!!
and of course its %$*$#( LOUD like a muscle car!

is it b/c cause i have no back pressure its slow and the same reason i have a bad idel?????????????????
my O2 sensor isnt hooked up just zip tied

and all i need to do is get a downpipe made and it should be all ok rite?????

thanks guys

 

[c711]

What else did you do?
Only bolt on a turbo?


What to hell are you thinking driving around without a downpipe?
bolt on a downpipe, connect all sensors and then see whats happen.

Are you still using NT injectors and ECU?
What about BOV and Wastegate?

 

[Mitsubeastie]

dude just think about it ? its not gonna run right >>?are u tarded ?

 

[Jst4Cyl]

dude just think about it ? its not gonna run right >>?are u tarded ?

"tarded" wow and this guy has 1 post and is already calling someone something he can't spell

 

[spooln4fun]

dude just think about it ? its not gonna run right >>?are u tarded ?

2nd spelling...
also idel=idle!

yes it will not run right without a downpipe, you do not have a drag car you need an exhuast of some sort. do you have all your vacuum lines hooked up properly as well, or have any boost leaks?

 

[luvmygst]

With no down pipe do you mean you just have the end of the turbo with no pipe at all? If so it will not build boost you need some backpressure. My cousin did the same thing when I turboed his 240sx. I had the car done with a t3/t4 hybrid, no exhaust hooked up at all. He decided that he wanted to see how it ran with a turbo.(I wasnt home) He called me almost crying because the turbo would make no boost. Moral of the story you need exhaust.

 

[dsun87]

yah...i guess ama be dragging my car to a muffler shop

everything is hooked up right and no boost leak i have a externa waste gate and bov

thanks guys

 

[tkelly27]

You don't need a down pipe, the turbine is the back pressure that the valves see, not the rest of the exhaust. Taking away the down pipe actually allows the turbo to spool up faster. I have never ever encountered any condition where a free flowing exhaust did anything detrimental to the running of a turbo engine, let alone kept it from spooling up! In fact, one of the first things I do when I get a new turbo car is to rip the down pipe off and take it for a rip down the driveway, then build a new one. Do get a down pipe though, you'll annoy your neighbors

Try hooking up the O2 sensor, it might fix your poor idle. You need to tell us what else you did before we can figure out what else might be wrong.

 

[oldman]

dude just think about it ? its not gonna run right >>?are u tarded ?

Really, how do you figure?

More importantly, we don't tolerate this kind of attitude on tuners, especially when your basis for the insult was wrong and you mis-spelled the insult itelf.

2nd spelling...
also idel=idle!

yes it will not run right without a downpipe, you do not have a drag car you need an exhuast of some sort. do you have all your vacuum lines hooked up properly as well, or have any boost leaks?

1. Something wrong with your shift key? Worry about your own grammar first.

2. Again how will it not run right without a downpipe?

yah...i guess ama be dragging my car to a muffler shop

everything is hooked up right and no boost leak i have a externa waste gate and bov

thanks guys

1. Please use proper grammar, spelling, punctuation and caps when posting in the tech forums.

2. How do you know you have no boost leaks?

3. How can everything be hooked up if the O2 sensor isn't?

You don't need a down pipe, the turbine is the back pressure that the valves see, not the rest of the exhaust. Taking away the down pipe actually allows the turbo to spool up faster. I have never ever encountered any condition where a free flowing exhaust did anything detrimental to the running of a turbo engine, let alone kept it from spooling up! In fact, one of the first things I do when I get a new turbo car is to rip the down pipe off and take it for a rip down the driveway, then build a new one. Do get a down pipe though, you'll annoy your neighbors

The only post that got it right, the only possible TECHNICAL issue with running without a DP is boost creep.

Try hooking up the O2 sensor

ding ding ding......we have a winner.

 

[bushy]

It is necessary that the O2 Sensor is hooked up for closed loop operation.

Not to mention your intake temps are probably insanely high from all the exhaust dumping in the engine bay.

 

[bling5tatus]

Yeah you can kiss your alternator good bye soon if you want to run no downpipe...

 

[Locke]

Yeah you can kiss your alternator good bye soon if you want to run no downpipe...

On a turbo 2gnt, (which the OP has) he will be kissing his upper radiator hose and P/S hoses good-bye if he runs long without a downpipe.

 

[dsun87]

you think driving it 5-10 mins to a muffler shop will kill the hose??

 

[luvmygst]

Every one says that runnning no down pipe will cause no probs. I installed a t4/t4 externally gated, no exhaust, jsut the flange bolted to the turbo. Guess what NO boost. Had a down pipe installed and it boosted like it supposed to. Could some one explain that to me? I did alot of research when having this problem and from all the info that I found you have to have something on the outlet of the turbo, it doesn't have to be a whole dp but a piece of pipe has to be there for the turbo to spool, just the flange will not do it. Just my .02 (and experience) Take the 02 housing off of your turbo and see how much boost you make.

EDIT: I hate to disagree with OLDMAN ill Get yelled at

 

[oldman]

I thought this is about no DP, not about no O2 housing. I have not tried anything as dumb as running a turbo without an O2 housing nor do I have anything plans to do so in the near future. I can however guarantee you running without a DP will result in overboosting if anything.

 

[KiNg MaRtY]

I also believe the sloppy idle could be caused by the 02 and also the BOV

 

[dsun87]

so do you guys think my car will be ok for a 10min drive to the muffler shop ???

 

[Turbo Talon DL]

You will not have boost problems without a downpipe on your engine. I ran my car with no exhaust for a while until I found all the parts I wanted. It boosted just fine. What about people who run an exhaust cut-out at the drag strips? Thats almost as good as not having a downpipe. If you cant boost without a downpipe then you have other problems.

 

[luvmygst]

I thought this is about no DP, not about no O2 housing. I have not tried anything as dumb as running a turbo without an O2 housing nor do I have anything plans to do so in the near future. I can however guarantee you running without a DP will result in overboosting if anything.

I would not recommend running no o2 housing either, the point that I was trying to make is that if he is externally gated then garrett turbos have no o2 housing, just a place for the flange to bolt to. At least I didn't get yelled at too bad

 

[oldman]

GET OFF MY LAWN!!!! ...oh wait, that's defiant..........I'm not that old yet.

 

[tkelly27]

I can't believe no pipe will make the turbo not spool. When I get ready to build the 3" exhaust I'll pop my O2 housing off and try it out. I have seen race cars without any sort of pipe that spooled up just fine. The way turbines work it really shouldn't matter weather or not there's a pipe on it or not. Personally I've only run without a down pipe, but not without an O2 housing.

Did your WG go back into the down pipe? The only thing I can think of is not having positive back pressure on the back of the WG valve allowing it to pop open. If that's the case then you just need to tighten the WG. That's all I can think of : (

Hook up your O2 sensor before you go to the exhaust shop!!!

 

[Calan]

...especially when your basis for the insult was wrong and you mis-spelled the insult itelf.

 

[Locke]

dsun87: Update your profile.

What else have you installed? If you just plumbed in a turbo, and did nothing else, that is your problem. You need some sort of added fueling, an FCD, and a tighter plug gap.

edit: oh yeah, install your front o2 sensor.

 

[Street_Killer]

My theory with the no downpipe issue, is that the ecu isnt use to it. No info to back that up just a theory.