Disconnected BCS...Slight Increase in Boost....Now what?

Topic: Disconnected BCS...Slight Increase in Boost....Now what? (Read 11144 times) previous topic - next topic

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #60 – July 13, 2007, 12:56:11 PM

Just out of curiosity, since this thread was originally started to solve me Pinging problem....is there a possibility that my Knock Sensor could be causing this problem?

Most of the time when under boost, I get to about 6-7psi, and then there is a smooth loss of power. Not a hard recoiling of the engine, but like a limiter has been kicked in. I can see the RPMS drop slightly, as does the boost. And since I have been pinging.....perhaps I should disconnect the sensor and go for a spin....

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #61 – July 13, 2007, 01:11:02 PM

Doesn't hurt to try...just listen and go easy.

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #62 – July 13, 2007, 02:13:37 PM

How bout a picture :D ....its as simple as A. to B.!! A is a little dark, but that is just where the rubber line comes off of the wastegate. There is a plug now in mine where yours needs to go (B.). On the 87/88 IHI's there is a T coming off of there one coming from the wastegate, and the others to the BCS. Disconnect it to the BCS and cap that side off so that there is only one going to the wastegate. This will give you 10#........ HTH

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #63 – July 14, 2007, 12:40:36 AM

10# assuming that the Wastegate is good right? And if I wanted more than 10lbs, how would I achieve that?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #64 – July 14, 2007, 08:09:10 AM

Quote from: DMC24guy;160682

10# assuming that the Wastegate is good right? And if I wanted more than 10lbs, how would I achieve that?

With a A4LD transmission rebuild... A head gasket replace... A engine rebuild... A turbo replacement...

In other words with high boost, that high millage stuff will probably take a dump on you...

Guessing the transmission has long since been rebuilt, they usually last about 100-120K, yep time for another one...

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #65 – July 14, 2007, 12:04:55 PM

That is all true.

However, if the Wastegate is bad, and I do perform this operation (Sounds to me like I just have to disconnect and plug the line running to the BCS) will I still get the 10lbs of boost?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #66 – July 14, 2007, 12:56:34 PM

Quote from: DMC24guy;160726

However, if the Wastegate is bad, and I do perform this operation, will I still get the 10lbs of boost?

What do you think?

Less typing, more wrenching.

Have you checked to see if the flapper is closing all the way?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #67 – July 14, 2007, 03:02:03 PM

Knowledge helps you understand... some info on wastegate operation.
http://en.wikipedia.org/wiki/Wastegate

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #68 – July 16, 2007, 03:30:51 PM

Well, I think I found my answer. I took off the small inlet pipe in the front of the turbo and exposed the Turbine and shaft. I grabbed it, and there was slight side to side movement. Not much, but it was there.

Turbo Time?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #69 – July 16, 2007, 03:35:41 PM

Quote from: DMC24guy;161193

Well, I think I found my answer. I took off the small inlet pipe in the front of the turbo and exposed the Turbine and shaft. I grabbed it, and there was slight side to side movement. Not much, but it was there.

Turbo Time?

There is always a little play, especially when there is no oil around the bushings. If it's not contacting the sides, it's not an issue. If it was "worn" enough to not make boost you'd know it.

Try again.

How about this...you checked that WG flapper yet?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #70 – July 16, 2007, 03:40:30 PM

Here's the problem, I can't find an Air Pump (That isn't for tires) with a Gauge on it, that has an open connection that I can stick a Vacuum hose onto. Not at Harbor Freight, nor anywhere else. I was going to hook up a pump to the wastegate, apply 9.5-10psi to the thing, and see if that connecting rod moves.

Problem is, I can't find a bloody pump anywhere that's not for tire usage.

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #71 – July 16, 2007, 03:46:25 PM

You can find a tappered adapter to use on a bicycle pump that is used for inflating toys, etc. It's not all that critical.

What you are looking for is not to see if the arm moves, but to see if the arm is holding the flapper open when at rest.

The pump is to aid reinstalling the arm onto the flapper stud because if it's set up properly, you'd need to pull the arm out of the WGA to reattach it to the flapper stud.

Until you verify that this is working/closing as it should...all the rest of this is useless.

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #72 – July 16, 2007, 08:04:37 PM

Please enlighten me as to where I can find an adapter that will fit on the schrader valve of a bike pump....

And how will I know if I'm applying 10lbs of pressure or less without a gauge?

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #73 – July 16, 2007, 08:13:48 PM

I told you what to look for....I'm sure you've seen places that sell inflatable toys and . Go to Walmart for christ's sake. They even have them with some of the vacuum testers at the auto parts places.

Again, YOU DO NOT NEED THE PUMP TO SEE IF THE FLAPPER IS CLOSING?

You know what...figure it out on your own...I'm tired of telling you the same ed thing 4 times.....

Disconnected BCS...Slight Increase in Boost....Now what?

Reply #74 – July 16, 2007, 08:36:26 PM

Dammit to hell! It is closing. I went under there today and grabbed the rod. I had to pull pretty hard to get the thing to open. If there is a spring down there keeping things shut, it's pretty strong, because I had to seriously yank on that rod to move anything.

And another thing, how do you go about removing this C-clip???? Where is the thing? The wastegate is not only under the Turbo, but the only way I could actually see this rod was to crawl under the car, and even then It was an awkward position to reach up and grab that rod. I would have taken your advice if I actually knew how to get to everything without burning or ripping my flesh.