Anyone have the specs on the GM turbo's? Looking at Holsets.

[Turbine Doc]

Not to beat up on the General too much, had they envisioned how far we "power junkies" have pushed the 6.5 envelpoe, they might have done a few things differently, left to it's basic configuration as an ecomomy minded, light duty truck emission friendly for the era; GM-X turbos do okay for what original intent was.

A lot was learned by the big 3 for Diesels in general in light duty use from the IDI engines they made, resulting in the medium duty engines now being sold.

 

[midniteplowboyy]

How do you like it? How is the spool?

The WH1C spools fine on my auto, its basically a HX-35.

Its a little sluggish @1200rpm if in OD converter locked and you slowly roll into the throttle, still has 7psi boost though there, blows a little black smoke and EGT are trying to go up. By 1500rpm you have 15psi and all is well, EGT's are knocked in the head, smokes cleared up, its hammer time.

Now if I go ahead and give it a little more fuel it'll unlock and down shift out of OD and there is no problem at all.

On a standard it might be more of a problem if you tried lugging it below 1500rpm, but mine still makes factory boost at those rpms(just my fuel is not factory). On a auto you dont have to worry much because the converter will flash past those lower rpms when you hit the go peddle.

Try it you'll like it.

 

[turbovanman]

The WH1C spools fine on my auto, its basically a HX-35.

Its a little sluggish @1200rpm if in OD converter locked and you slowly roll into the throttle, still has 7psi boost though there, blows a little black smoke and EGT are trying to go up. By 1500rpm you have 15psi and all is well, EGT's are knocked in the head, smokes cleared up, its hammer time.

Now if I go ahead and give it a little more fuel it'll unlock and down shift out of OD and there is no problem at all.

On a standard it might be more of a problem if you tried lugging it below 1500rpm, but mine still makes factory boost at those rpms(just my fuel is not factory). On a auto you dont have to worry much because the converter will flash past those lower rpms when you hit the go peddle.

Try it you'll like it.

Thanks, I have one, found one for $100, just needs putting together, the guy had a project and gave up.

I think the remote setup I have coupled with headers will help eliminate any lag. I've been told to cap it at 10 psi using a stock turbo, what should I cap this turbo at? I have a 6.2, normal compression.

 

[Matt Bachand]

Do you have pictures? I have always thought remote turbo's add lag for sure, the fresh air possibiliities are great though.

 

[midniteplowboyy]

Matt, Me or Turbo? I have some pics of the Holset over at the place, in my 93's garage. I haven't uploaded many here, dial-up sucks.

 

[midniteplowboyy]

Holset oil feed is metric.

My Holset, I used a M12x1.5 Metric x 1/4" Female NPTF adapter for the oil feed line from the GM-3 line, my holset threads were 12mmx1.5 with an O-ring. I bought my adapter from discounthydraulichose.com , but they have a minimum $20.00 order.

The GM-x has 1/4" pipe threads and the GM adapter is just 1/4" pipe to SAE 45º flare 3/8"IIRC.

The oil drain, bolt it to the holset without the hose coupler at the block, then just pry it over to where the two tubes line up, only has to move like a 1/2", fits perfect.
_

 

[turbovanman]

Do you have pictures? I have always thought remote turbo's add lag for sure, the fresh air possibiliities are great though.

I haven't built it yet, but when I do, I will have a thread on it.

It depends on the turbo, etc on remote mounts, they usually go smaller so as not to have alot of lag but mine will be right off the Y-pipe so I don't think lag will be an issue. I also won't be running an IC as I will maybe loop the outlet pipe then straight to the intake, so that will cool it down some, :thumbsup: