Help Me Please!

[KiwiSpyder]

I made a bigger turbo outlet elbow. I didnt put the little nipple on it like the stock one. I put it on and ran it down the road. It was kicking out alot more power. Then all of a sudden it started running like ass. I blew the head gasket. Is it from not putting the little nipple on the elbow or did it just blow? Should i put a nipple on it or is it fine as is? SOMEONE PLEASE HELP ME!

 

[candela]

Well Im not exactly sure what you talking about. but this could have been a few things. One it oculd have been the wastegate line, the wastegate doesnt see a boost signal you will be running a lot more boost. Two it could have been your boost controller line, the BC bleeds of all that source that is to go to the wastegate...you run a lot more boost.

You are lucky to have (hopefully) just blown you HG and have nothing else happen like melting a piston. This is now all the more reason to throw in some bumpsticks and install some arp head studs... Good luck

Austin

 

[KiwiSpyder]

Its the first piece that comes right off the turbo and goes into the intercooler. The stock piece had a little nipple on it and a tiny hose. The hose went down and and split into 2. One hose went to the wastgate acuator and another to that little black thing on top of the air intake. (i forgot what it was called). So i just took the hose that is connected to the black thing on top of the air intake and hooked it directly up to the wastegate. I seen it done on another car.

 

[nine5raptor]

so in other words, your wastegate actuator had no boost signal. you were probably running up in the mid 20's-30 psi and you toasted your engine.
What you saw on other cars was actually a "t" in the vac. line running from the intake mani to the "little black thing" also known as the compressor bypass valve, or blow-off valve.
the t sends the boost signal to both the wg and the cbv. by connecting them directly, you had no boost signal for either. with no boost signal, the actuator doesn't open the wastegate and the boost goes higher and higher until the turbo blows or the engine grenades, the latter of which is what you experienced.

on a side note, Candela, did you sell your car to one of my fellow kcdsmer's?

 

[KiwiSpyder]

but i know a car right now that is running around without the t in the line and its going straight from the compressor bypass valve to the wastegate. there is nothing on the turbo outlet elbow, but then again he has a stock turbo and his car is running like ass.

 

[KiwiSpyder]

so in other words you need the T in the line one going the "nipple" and the other to the compressor bypass valve?

 

[nine5raptor]

running like that will most likely ruin all three of: 1.cbv 2. turbo 3. engine

not so much the first one, but they are designed to run with pressure on top and bottom of the diaphragm (the vac. line on top and boost in the intercooler pipe below). When you close the throttle plate, the boost disappears from the vac line, causing a pressure differential and opening the valve. With no boost on top, the valve will always be at least partially open.

2. as boost goes up, so does exhaust gas volume. as more exhaust comes out, it spins the turbo faster and faster. more exhaust, more spinnage. it is an uncontrollable cycle, unless you introduce the wastegate. this allows exhaust to bypass the turbo and allow it to stay spinning at the same speed (boost) instead of going out of control. the way it limits this is when a certain pressure is applied to a diaphragm in the actuator (bronze part on the outside), a spring tension is overcome and the valve opens, letting the exhaust through. without boost on the diaphragm, the valve never opens and your turbo just spins faster and faster until it blows apart or something else gives first. for example, the engine.

3. as boost levels get higher, cylinder pressures go up (much more quickly in fact). this can blow a head gasket or cause excessive heat which can lead to detonation (or knocking or pinging) which causes severly violent changes in cylinder temps/pressures. this can melt parts or simply cause them to 'blow' out through the side of the engine. if you simply blew the hg, you got lucky. better check those pistons/rings though.

 

[candela]

on a side note, Candela, did you sell your car to one of my fellow kcdsmer's?

Well Im not sure. Some guy named Andy is driving out here to pick it up tomorrow. Hes got a 20hour drive ahead of him I feel bad so Ill prolly invite him in for a beer or something see if he needs to get some sleep.

Anyhow Kiwi (weird name eh ),

There are more than a few ways to hook crap up as different people use different sources for the boost signal. However there is only one way they can be hooked up wo "work", not overboost and experience BHG or melted pistons

The BOV needs a boost signal to open as does the wastegate actuator. So what most people do is run a line (that has a boost signal) from teh intake manifold, to the BOV then "T" it and run it to the wastegate actuator as well. You can use the nipple on the elbow for a signal if you want, I prefer the IM though. Just make sure if you are using a MBC, or your just not sure you ask so you dont do something as dreadful as switching a vacuum line and blowing you HG


Austin

 

[nine5raptor]

Originally posted by candela


Well Im not sure. Some guy named Andy is driving out here to pick it up tomorrow. Hes got a 20hour drive ahead of him I feel bad so Ill prolly invite him in for a beer or something see if he needs to get some sleep.

Austin

His other one is currently sitting on its roof in a field unless he got it moved. Poorly marked construction is the cause. He was the 3rd person in like two days to not see the road closed sign on the highway and tried to turn off at the last second (coming over a hill or something), went off the road and flipped. Are you leaving any goodies on it? He has all of his off of his other gsx, but you had some pretty nice stuff.

Also, did you buy a different dsm?

 

[KiwiSpyder]

i had a rebuilding kit coming anyway. just as long as the turbo is fine. okay so asap i will put the boost line in. thanks for the help and i will have to check out this car running with out the line. I bet that he has it just not where i looked.

 

[nine5raptor]

sounds good. Good Luck with it!

 

[KiwiSpyder]

one more thing. when i was running with out the line my car was fast as hell. to bad it didnt last though.

 

[candela]

one more thing. when i was running with out the line my car was fast as hell. to bad it didnt last though.

Leaner is meaner

Are you leaving any goodies on it?

Well not near everything. Im leaving the SS brake and clutch lines, act2600 w/RRE lightened flywheel, basicall yeverything else is withing 5k miles of replacement (brakes, MC, FP) all that crap, walbro 255lph, dual pillar pod (empty though ), but the block and mounts are still in but I told him that if we sell it Id split it with him... I do want the prothane mounts back though, he said he'll ship them back to me which I trust...

 

[nine5raptor]

I think he mostly just wants the body. He's only had liability only insurance, so no hassle there to get his parts back which are all good, the car is just considerably shorter

He said next time hes putting a roll cage in as just about the first thing as it's not fun to be upside down and have the roof caving in on you.

 

[mike9146]

Originally posted by KiwiSpyder
I made a bigger turbo outlet elbow. I didnt put the little nipple on it like the stock one. I put it on and ran it down the road. It was kicking out alot more power. Then all of a sudden it started running like ass. I blew the head gasket. Is it from not putting the little nipple on the elbow or did it just blow? Should i put a nipple on it or is it fine as is? SOMEONE PLEASE HELP ME!

And we wonder why DSM's have a reputation for being unreliable. It simply amazes me that there are people out there that will mess with things under the hood without a freakin' CLUE what they're doing.