16cm installed

[steveinaz]

installed a 16cm housing yesterday and lost 4 lbs of boost. throttle response is better. how do i get some boost back? i still have a leaky head gasket so i can't crank the pump up as much as i'd like. will probably do the head gasket next weekend along with the valve springs and gov springs.

oh by the way i smoked an excursion on the on ramp on my test drive

 

[dpuckett]

Hate to burst your buble....

But I've outrun excursions on the ramp with my old slug. Someone needs to get stickers made up with something to the affect of sixes eating v8s. Kind of like what's his name had for a TDR handle a few years ago.



Now, on to your boost loss. It could be your head gasket. IT could also be the fitting from the turb outlet to the elbow to the intercooler. I had to get a hammer out and GENTLY tap on it to get the elbow back on tight in Mom's pickup last summer. Also check all your other connections.



Daniel

 

[CDegner]

If you have to use a hammer on your turbo housing to get something to seat, there is something else wrong. I would suggest finding out what is not fitting right and replace it.



When I put on my 16cm housing, I lost boost at first. Then I replaced the gasket between the COMPRESSOR housing and the outlet elbow. Got that replaced and my boost ended up 4 psig higher.





You have an 18cm housing so you should expect to see about a 2 psig increse in boost.



Carl



Editted to correct my stupid typo! :{

 

[steveinaz]

"Then I replaced the gasket between the exhaust housing and the outlet elbow. "

I have no gasket in this location

 

[dpuckett]

Carl-

I was referring to the impellar side- the fit of the turbo outlet flange into the intercooler/ tubing elbow is tight, and I didnt get it tight enough by hand. Tapped it with a hammer, and it was good. Had to do it on a couple housing swaps. Had other issues on my current rig



I dont have a gasket between the exh housing and exhaust pipe elbow, either.



-DP

 

[steveinaz]

dpuckett

mine didn't want to go right in either. had to persuade it with a sfdbh. not to be confused with a "bfh".

steve

 

[Greenleaf]

Ok. I have read this thread twice and for the life of me... . I cannot think what exhaust elbow needs a gasket. Not having any issues. I just need to clarify for myself and others who are on the fence about a gasket.



Oh yah! Someone making adjustments on the turbo with a HAMMER!! Yep! How else you supposed to do it?



-S

 

[JLEONARD]

sfdbh

OK. Took me a couple of times but I got it!!

 

[cerberusiam]

Scott, they are taliking about the boost side not the exhaust side. Somebody mis-spoke. There should be a square gasket between the the impeller and the elbow that leads to the IC. Without it you may have a boost leak that only happens at higher boost.



You should be able to slip the elbow into the compressor output with little force. If you have to force it you run the chance of gouging the aluminum and causing a sealing problem. Emery paper and a sharp knife will work if the imperfections are small. Of course then you need the gasket cuz it won't seal without it.

 

[Greenleaf]

Yeah! The square-cut "O" ring. That helps. Yepp-er. That elbow will seal against the housing. The elbow sets up against the housing flange and the clamp tightens the assy. Never needed a hammer. It just sets against it with hand pressure while you secure the clamp.



Got it



-S



For awhile there I thought it was the exhaust fumes in the shop.

 

[CDegner]

Originally posted by steveinaz

"Then I replaced the gasket between the exhaust housing and the outlet elbow. "

I have no gasket in this location

DOH! That should read Compressor housing and outlet elbow.



Sometimes I amaze myself that I can keep my truck running!



Carl

 

[CDegner]

Originally posted by cerberusiam

Somebody mis-spoke.

That would be me!



Thanks for clafirying until I could correct my error!



Carl