20g in stock turbo?

[jwaller]

as you are looking down the path that the exhaust takes you will want to open up the side of the WG hole that is closest to you. what you are trying to do is create a shelf or a shovel almost to scoop the exhaust, instead of the 90 deg right angle that the exhaust has to make now...

 

[Ian Turgeon]

would it be possible or even bennificial to fill/smooth the wg port entrance on a mitsu exhaust housing?

(think external wg)

 

[jwaller]

yes....bc the same principal applies to this internal as it does any external......most ppl mount the external on the crossover at a right angle to the flow of the exhaust. this makes it very hard for the exhaust gas to turn that corner and exit the pipe....the main reason external work well on your trucks is bc of the increase in size. if you were to make that thing at the proper angle and or blend it to where the exhaust gas could flow smoothly both systems would work much better.

think of it this way...suppose you put a 90 deg turn into each one of your intake runners before it went into the cyl head........do you think this would work very well?

 

[Ian Turgeon]

I understand that, the question is: would it be possilbe or even worth the time to fill the wg port on the housing since I no longer use it for boost control.

 

[turbodig]

I'd definitely ask about a bit larger exhaust housing, but that setup was what about what I had on order, but I had hunted down a 12cm² housing for it 8)

I still worry about the high-altitude-induced-extra-lag-factor.

Ask Klinger or anybody else who brought their truck up here.

Stock factor boost lag TOTALLY sucks up here.
I am looking for an improvement over stock on the lag reduction, mostly and then adding some power.

Drivability is a major issue for tip-in on quasi-stockers up here, that is the motivator for the smaller stuff...

I want my sea level performance!!!

GGGRRRRrrrr!

-W

So fix it.

You can do a lot to get a 20g/14 to act more like "normal" by simply
tweaking the WG duty cycle and threshold parameters. This is going
to be even more important at altitude, since you have a lower ambient
pressure, and need to run a higher pressure ratio to get the same
effective boost.

You're also really rich AFR-wise up there, which just kills spool up.
You can actually use fuel as a wastegate, if you take it to extremes.

Downside is, you'll need to pop a sea-level chip back in when you
get back down to flatland, or your boost is likely to go ballistic.

I tuned Dave Kripal's for Chicago altitude, and got it to respond ok,
but he sez since he's been back in the thin air, things have really
flattened off. His WG DC is nearing max, though, so he'll need a
bigger WG spring to get things back to normal. That's something
I'd recommend with a 20g anyway, regardless of altitude.

It can be done, you just have to tune for the environment you're in.

Later,
Dig
turbodig@yahoo.com
11.94@112 - 20g powered, Stock mufflers + plumbing.

 

[Eluding]

Thanks John. When I get the turbo off in about a month I'm going to town with the grinder. I hope to get a spare housing to port to minimize downtime.

 

[jwaller]

I would image if you wanted to fill the wg hole I would try and press something in that hole and grind it smooth... I would not try and weld to it bc of it being cast I would not expect it to stay... but pressing in something from the rear and gring it smooth could be an option for you.

 

[sytyguy]

FWIW, I had Reed (turborepair) do my turbo years ago. 60-1 cold side with stock hot side. Spool is instantaneous with a 9/11, and it pushes a decent amount of air. Would do very well on a stock/mild build IMO, but is starting to run out of air and become a restriction on my build (I'm skeered to actually measure the exhaust backpressure ). That's why I got that 12cm2 housing off of Green in GB '01. Had plans to use it with an H wheel on my current hybrid, and it's still sitting on the shelf (so yes, I know where a 12cm2 housing is..... :wink: ).

I'm debating on future plans for the truck, but would like to step up in the 60 series and use that with either a 14cm2 housing or the 12 I have. Not looking to go hella fast anymore, and would just be shooting for a good street turbo with some added "ooomph".

I have had good luck with this turbo so far, and it has surprised me with how quick the truck is with it. Bolts up beautifully, but hafta use a cold air kit for the larger inlet and have grind a small amount off the A/C bracket for one of the bolt heads.

When I upgrade, if you even wanna try it Ian, just lemme know.

Michael

 

[Ian Turgeon]

I asked for some details about rebuilding the stock turbo with a 20G compressor wheel:

Ian,
The 20G wheel will fit into a properly machined stock compressor housing, but the thrust collar and seal plate are different between the C series and G series turbochargers. To do this correctly you will need to have the turbocharger rebuilt and re-balanced to ensure a full life. We offer this for $450 with a rebuildable core.
The 10cm turbine housing will run you around $170 when available. It is very hard to come by. An alternative would be to clip your TDO6 turbine wheel (adds $25 to the price) or install the TDO6H turbine wheel (adds $100 to the price) depending on your goals.

Thanks,
Reed
Turbo Specialties, Inc.
www.turborepair.com
turbos@turborepair.com
205.664.2200

Waiting for hann to get back to me after detailing what I have.

 

[smeagol]

You might want to call around looking for the 10cm² housing. You might be able to dig it up somewhere, like I did with the 12cm² housing. Hahn & the rest of the DSM turbo crowd would be the first places I'd start calling.

I think the 10 is a worthwhile upgrade obviously. 8)

 

[smeagol]

Saw this:

http://www.turbochargers.com/mitsubishicatalog/mitsutruck.htm

They have a turbo on there that is a 19c with 12cm2 housing.

This may be a good bolt in turbo as well, for the very stock truck.

Need to call and talk to someone to make sure it would be physically compatible.

This would give a great exhaust side- TD06H turbine wheel, and 12cm² housing, but with a 19c compressor wheel - stock is 17c, and then you have the 20g, to give you an idea of compressor size/flow.

So far, going to Reed sounds like the best idea anyways, since he will rework the stocker for fairly cheap.

 

[Wayne]

Give me a call at the shop with some of yall's idea's .......... I've got a couple of my own .........
Wade
713.681.1111
1.800.749.7111

 

[Ian Turgeon]

Give me a call at the shop with some of yall's idea's .......... I've got a couple of my own .........
Wade
713.681.1111
1.800.749.7111

then speak up.

 

[Wayne]

I was thinking along the lines of a TDO6H Turbine wheel / 60-1 maybe
62-1 compressor wheel combination...... I've got the compressor housing figured out ....I'm trying to find the right turbine housing that would help the turbo spool decently. Unfortunately I do not own a Syclone anymore ....... Anybody own a Syclone here in Houston that wouldn't mind stopping by the shop so I could look under the hood so I could get a good idea on the clearence requirements for the compressor housing ?

 

[Ian Turgeon]

thought I'd bring this back from the dead since I have some info to add...

I finally got a hold of a TD06H-20G and a 12cm and 14 cm exhaust housings.

some facts from looking at things.

There is a noticable dif between the exhaust housings, the cm size is obviously how much volume there is in the housing. a cubic cm ist that much however. The exhaust inlets are all exactly the same, 4 bolt, and smaller then the outlet of our stock manifolds. All could use some porting to match them up.

The 20g wheel is bigger then the 17c. It would require machining to fit in the tdo6 comp housing...

However, looking at the tdo6h and tdo6 comp housings, they appear almost identical with exception of the slightly larger bore for the wheel, and the outward appearance of the mounting tabs for the wastegate ( mitsu smartened up and designed it so you can turn the housing a bit and still mount the wastegate easily). So I believe if the stock housing was machined to fit the 20g wheel, the comp housing would effectively be the same ( I was concerned the 20g's may have been slightly dif to take advantage of the particular wheel).

the td06h turbine side definately will NOT fit in the tdo6's housings. 1 the turbine is bigger, and 2 I believe the whole center section is of a larger diameter.

my suspicioun that the center section is larger leads me to believe one could not machine a tdo6 comp housing bore, and it fit onto the tdo6h, however I'm not positive.

Otherwise the tdo6h is a bolt on. Same comp inlet/outlet size. Same exh inlet/outlet flanges.

I have yet to bolt it on to find out if all the fittings bolt on, but I'm positive they do.

 

[Maxtor]

The 20g is truly a direct bolt on for an additional 100cfm. Coolant/oil supply and return, turbine inlet, intake, and compressor outlet all match up with the stocker. Nothing needs to be modified to put it in place. I used Bob Galla's SS pipe and it fit perfectly between the 20g and the intercooler.

At one point I also owned a 20g with a 8cm2 (stock size) turbine... not sure how they got it to fit, though. It was like that when I bought it. The housing was way too restrictive but it really came out of the hole nice.

 

[jwaller]

I was thinking along the lines of a TDO6H Turbine wheel / 60-1 maybe
62-1 compressor wheel combination...... I've got the compressor housing figured out ....I'm trying to find the right turbine housing that would help the turbo spool decently. Unfortunately I do not own a Syclone anymore ....... Anybody own a Syclone here in Houston that wouldn't mind stopping by the shop so I could look under the hood so I could get a good idea on the clearence requirements for the compressor housing ?

figured out? ya I and several others have run this exact turbo with many different exhaust wheel/ turbine housings.

http://www.georgiasyty.com/John/johnturbo.htm