Boost control issues

[TURBOPOWERED68]

22-23 psi with the waste-gate disconnected and a FREE MOVING PUCK
And the waste-gate is ported

What to do next to control boost?

 

[1KWIKSIX]

Here's a few questions that I'd like to ask, just to verify some details:

What turbo?
Journal or Ball Bearing?
What size hole did you hog it out too?
What's the OD of your puck in your down pipe?
Did you radius the inner lip of the wastegate hole in the exhaust housing after porting?

 

[TURBOPOWERED68]

Here's a few questions that I'd like to ask, just to verify some details:

What turbo?
Journal or Ball Bearing?
What size hole did you hog it out too?
What's the OD of your puck in your down pipe?
Did you radius the inner lip of the wastegate hole in the exhaust housing after porting?

Te-6031 with EO garrett exhaust housing
Journal bearing
Idkd
Idkd
Nope

 

[TurboBuRick]

Pretty cut and dry. It's not ported enough.

What down pipe? How big is the puck?

Rick

 

[1KWIKSIX]

If it were mine, first thing I'd do is to remove the down pipe to verify puck diameter, pull the turbo next & verify the OD of your hole.
I found my new DBB turbo had a 0.90" opening & would overboost / spike like crazy until I opened it up to 1.10".

Had it opened up on a bridgeport milling machine .
Then radius the inner lip of the ported hole.

Be sure to leave at least 1/8" sealing surface for your puck.

The above cured my overboosting issues.

 

[TurboBuRick]

Great advice. The bridgeport is a little overkill but effective.

I do them right on the car with the die grinder and carbide burr.

Rick

 

[1KWIKSIX]

Great advice. The bridgeport is a little overkill but effective.

I do them right on the car with the die grinder and carbide burr.

Rick

You might be right Rick..however my puck was no where near centred over the wastegate hole & I didn't feel like spending alot of time with a grinder. Have a friend who is a machinist in the aerospace industry that offered to do the deed for me.

David,
When you remove your down pipe, take note of the carbon footprint left on your exhaust housing from the wastegate puck in your down pipe.
This will show you what you need to know. It will verify if your puck is centred over the opening + you can see how much of the puck is seating on your opening. Use it as a guide when porting the hole being sure to leave at least 1/8" to seal the puck. Remember too big is not good either as it can cause slow boost issues. So if you've got one of Jason's (RJC Racings) DP with the huge 1 5/8" dia. puck, don't open it up as large as you are able or you may have problems the opposite of what you're chasing.

FYI, my SE Turbo DP had a 1 3/8" sized wastegate puck (have since sold), but my THDP uses a 1 1/2" diameter puck. Am running the THDP presently.

Maybe post up some pics of your exhaust housing when you can.

Good Luck!


dave

 

[TURBOPOWERED68]

I am going to have some work done on the car, I guess i can try and add this to the list.