20g in stock turbo?

[Ian Turgeon]

Ok, the situation is: I wanna keep the stock converter, and run a turbo thats just more effecient at equivelent flow/boost levels.

If I'm correct, the 20g is what I'm looking for.
1- Can I use the stock turbo's compressor/exhaust housings
- if so, is there any modification required?

2- What are the compressor map differences between the two?
- am I going to get the same or better performance on the 20g at the same boost levels? Or do I have to run higher boost levels to get the same performance?

general input?

 

[smeagol]

20g with the 14cm² housing will have horrible spool up on the stock converter. The 20g has different wheels on both sides, stock housings may be used, but they'd minimize the performance gains.

Choices are (IMO, to keep a stock-like turbo, as well as to keep the stock converter)

a- Hybrid setup
or
b- 20g with 10cm² or 12cm² exhaust housing

Turborepair.com can probably do either, Mike was dealing with them. I do know that Hahn can do up a 20g with 10cm² housing relatively quickly, and that will work out great on the stock converter. It will work out great at pump gas levels as well as elevated boost levels, probably to 20-22psi.

I'd give Reed a call over at turborepair.com. He has done all of Waller's turbos up, and they have worked out well. I do know his turnaround isn't fast. I did have a hybrid on order for weeks and finally cancelled it.

 

[jwaller]

I've had reed build several 20g compressors in the stock compressor and exhaust housing....all of the them have turned out great and the look is killer.....20g with zero appearance mods....

his turn around depends on the work load....too bad it's almost always very busy...

 

[Ian Turgeon]

I'm assuming the stock exhaust housing is 14cm2 by the way BG worded that.

So I'd be looking at a 12cm2 exhaust housing and a 20g center section, while maintaining the stock compressor housing?

waller, are your experiences pretty much along the lines of BG words, or have you not even tried them with the stock stall?

 

[smeagol]

No a stocker is a 7cm², the 10/12/14's are upgrades. The 20g turbo assembly has a different exhaust wheel than stock, and it *can* be fit into a stock exhaust housing, but you are holding it back.

We've said before, the best bolt on turbo for a stock truck would probably be a 20g with a 12cm² exhaust housing, to work with the stock stall. The 10cm² is the closest to it, giving *great* performance. Reed can workup a bunch of different combos, I've been referring to turbo builds that could be built with 'off the shelf' parts. Reed does custom work, machining, assembly, balancing. Not that it's better or worse, just that once you go custom, you can do about a million different combos. I do think that a hybrid turbo could give you better performance than the 20g builds we are talking about, considering the ones that Reed has done in the past. Something with a 57 or 60 trim compressor side, and a 06 or 06h exhaust wheel, in a 7, 8, or 10cm² exhaust housing (or if you can locate a 12cm²) would work out great on a stock type setup.

 

[Will_in_China]

Greenie, that is pretty close to what josh@turborepair was talking to me about for my "GMPP Stealthy Stock" setup:

It was a 50trim Garrett Inducer with a 7cm² Exhaust Housing and an 06.
Apparenty it is THE SHIT for the 2 litre DSM guys.
He says he matches A/R and lag is no longer a problem.

He said it was good for 600HP, proven.

Broken down as such:

• 
  $350 Rebuild
  $60 Wheel
  $70 Machine Time
  $490 Total

Although I think I am going to continue pondering this and other hybrid options.

I see why many people just get a bigger hair dryer, dp and a tc...

-W

 

[smeagol]

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)

 

[THEMADTYPH00N]

Hey Brian, do you have any idea where someone could get a hold of a 12cm2 housing? I know they're hard to find.

 

[Ian Turgeon]

searching on 20g helped me move along my understanding a bit. It looks like all these mitsu turbos will bolt up correct?

I see why that hybrids (a garret/mitsu mix) pose a solution due to cheaper/widely available parts.

What sort of changes am I looking at for the compressor housing, going to a hybrid opens that up to the garret options, but would the mitsu utilize the stock compressor housing? or necessitate a different one?

a bit of good reading:

http://www.syty.net/phpBB2/viewtopic.php?t=21395&highlight=20g
http://www.syty.net/phpBB2/viewtopic.php?t=21284&highlight=20g
http://www.syty.net/phpBB2/viewtopic.php?t=9989&highlight=20g
http://www.syty.net/phpBB2/viewtopic.php?t=9747&highlight=20g
http://www.syty.net/phpBB2/viewtopic.php?t=9221&highlight=20g a/r = cm2?
http://www.syty.net/phpBB2/viewtopic.php?t=9429&highlight=20g

 

[jwaller]

damn it green the stock exhaust is an 8cm.......

and the stock exhaust with a 20g wheel still spools up nicely with the stock converter...if you are changing converters then you may as well step up to a 57, 60, or 61 comp wheel....then look at different exhaust housings and exhaust wheels....

but by far the cheapest quickest and easiest first mod is the 20g comp wheel...
for a look at some of reed work check out the 2 he has built for me in the past few months.....

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


and the big boy

http://www.chitownsyty.com/gallery/view_album.php?set_albumName=albuo53&page=2

 

[smeagol]

damn it green the stock exhaust is an 8cm.......

Doh! Anyways, i'd still go up to a 10cm² if at all possible. Look at the boost control issues we see on the stocker... it is too small. Compressor will affect that, but not nearly as much as the exhaust side.

 

[Will_in_China]

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

 

[smeagol]

Hey Brain, do you have any idea where someone could get a hold of a 12cm2 housing? I know they're hard to find.

I called around, no one could get one, finally found Hahn Racecraft, right under my nose (they are just outside Chicagoland) had one sitting on a shelf. All I can say is, call around. It will NOT fit a stock turbo (06 turbine wheel).

 

[Raist103]

i just installed the pte kit with a 54 and have almost no lag, within a 1/2 sec differance then stock turbo. i love it

 

[jwaller]

thats right the 12cm housing must be used with a H turbine wheel...whcih oculd be a pretty good option for you guys wanting quicker spoolup with the 20g setup....as far as boost control goes....port the WG stiffer actuator and try your best...the larger the housing the better but it's a trade off for spoolup...until you go external....

it takes 10 min to port the stock setup once the housing is removed and it's a huge improvment that needs to be and should have been done from the factory...

 

[Ian Turgeon]

Im my case the boost control is not a concern, Innovative pro gate.

 

[smeagol]

thats right the 12cm housing must be used with a H turbine wheel...whcih oculd be a pretty good option for you guys wanting quicker spoolup with the 20g setup....as far as boost control goes....port the WG stiffer actuator and try your best...the larger the housing the better but it's a trade off for spoolup...until you go external....

it takes 10 min to port the stock setup once the housing is removed and it's a huge improvment that needs to be and should have been done from the factory...

It should have just had a larger turbo from the factory. The most efficient turbo setup doesn't need a wastegate to do much, as it is wasted energy not taken advantage of by the turbocharger when it bypasses it via the wastegate.

 

[Maxtor]

FWIW - I had a 20g with the 8cm2 housing for quite a while. It was fun for a basically stock Sy - definitely an improvement over stock on the street and at the track.

I have a 20g with a 12cm2 housing now (housing from Chan) and love it, but it had a bit too much lag to suit me with the stock converter. Brian is right, I think a 10cm2 housing would work best with the stock TC. I switched to a 2800 9/11 and it seems to fit very well. Boost control isn't an issue since switching to an external Tial. I hope to run high 11's this year with the 20g 12cm2 on a stock motor with a lot of tuning. We'll see....

 

[Eluding]

it takes 10 min to port the stock setup once the housing is removed and it's a huge improvment that needs to be and should have been done from the factory...

Could you please explain how to port the wastegate? I'm going to have my exhaust housing off soon to port the mis-match to the exhaust manifolds and I'd like to port the wastegate while I'm at it.

 

[dgoodhue]

it takes 10 min to port the stock setup once the housing is removed and it's a huge improvment that needs to be and should have been done from the factory...

Would I just port from the puck to the exhaust?