CLASS RACER FORUM - Turbo Stockers

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Re: Turbo Stockers

Quote:

Originally Posted by art leong (Post 202061)

It happened to me a few times especially when the car sat for a couple of months. I would just free it up. Then put it back together.
It happened when I sold the car to Jim. Took it to Cecil County Went to the line, The car left like a garbage truck. I knew what the problem was but the look on Jims face was priceless I knew he was thinking what did I come up here for? Loosened it up, ran the expected number. And the car was on it's way to Fla.

If I were you I'd look for some heat resistant preoiled bushing And install that.
It seems to be the leaded gas that does it Jimmy Malone hasn't had it happen to him that I know of and he uses the VP unleaded.

I suspected the leaded fuel might have something to do with it.

How did you free them up?

Re: Turbo Stockers

Quote:

Originally Posted by Rob Lloyd (Post 202035)

I'm not to worried about the compressor side. It's the turbine I'm worried about. I have a good turbine housing, but all of my turbines measure at least 0.04 smaller than the housing at the exducer. I think maybe my turbines are worn down pretty far. My guess is it should only have 0.01" clearance, but I don't know for sure what the turbine is supposed to be. I found some specs that say it should be 1.88" - mine measure more like 1.84". Ouch! But, again, the housing bore measures close to 1.88" So, I don't know if that spec is for the housing or the turbine.

You definitely do NOT want 2mm clearance around the compressor. It will cause a very slow boost rise. You want as small a clearance as you can run on the compressor side.

Related question - Art, did you have trouble seizing the wastegate arms? I seem to seize one up every single season. The 'good' turbine housing I mentioned above I shelved because it seized the WG arm. I took it apart and reamed it out, but I'm concerned it will just seize up again. I reamed it with a 5/16" drill (the arm measured 8mm, so there's alot of clearance now). Just gotta get the arm welded back up and put my 'good' turbine in there for Indy...

And what would be the reason for having movement in the waste gate arm?
Is that what they call "bracket mode" ?

Re: Turbo Stockers

Quote:

Originally Posted by Mark Yacavone (Post 202098)

And what would be the reason for having movement in the waste gate arm?
Is that what they call "bracket mode" ?

Well, yeah. If the arm doesn't move, the boost is uncontrolled. I've gone fast that way, but consistency is non-existent.

Re: Turbo Stockers

Quote:

Originally Posted by Mark Yacavone (Post 202098)

And what would be the reason for having movement in the waste gate arm?
Is that what they call "bracket mode" ?

We delay the waste gate opening but not stop it. With the waste gate closed you melt the motor, but go fast.
Bracket mode would be lowering the total boost. Or running it rich. I've done both sucessfully
Bracket mode on my N/A car is just shift it 1000 rpms early.

Re: Turbo Stockers

Quote:

Originally Posted by Rob Lloyd (Post 202091)

I suspected the leaded fuel might have something to do with it.

How did you free them up?

With a hammer (chevy tool).

Re: Turbo Stockers

Just ditch it and run an external wastegate ha.

Re: Turbo Stockers

Quote:

Originally Posted by Jimi B (Post 202176)

Just ditch it and run an external wastegate ha.

The legality of that seems a little gray to me, so I think I'll stay away from them until it's more black and white.

Re: Turbo Stockers

I suppose all of this applies to FWD cars where traction is a problem.
You won't melt stuff if you retard the timing appropriately.
Why not use an MSD Boost control?

Re: Turbo Stockers

Quote:

Originally Posted by Mark Yacavone (Post 202222)

I suppose all of this applies to FWD cars where traction is a problem.
You won't melt stuff if you retard the timing appropriately.
Why not use an MSD Boost control?

Mark I can show you 20 turbo dodges with stock type ECU's that slowed up a bunch with the MSD unit.
If you retard timing you actually raise EGT I know it doesn't make sense. But I've been there done that.

Re: Turbo Stockers

Unplug the knock sensor it will be more consistant.or the ecu will hear noise and retard the timing a bunch.would love to check out a 2.3 turbo stocker.