18g or 20g Turbo

[Talon64]

Ok well right now my 18g 6SL2 has bad shaft play and will be sending back to force performance to get fixed. (Hoping it will be free on 3k miles on it!) Right now I just got a SBR Bastard 20g TD05H to put in the car now. Both turbos ported. My question is which turbo would be better for me. I just purchased dsmlink and I want to be around 20 psi or more if my motor will hold it. My profile is up to date. Stock 7 bolt with 40-50k (JDM motor). Anyone with information will help a lot. I want to push this 7 bolt to the max. If it goes it goes! Gives me more reason to build my 6 bolt I have sitting in the garage.

 

[Pirrofab]

My thread about 2 months ago might help you with this. titled "stock appearing turbo for 2.3 liter" I've since then started to change my mind again and now I'm Thinking about a holset. I can't keep my head pointed in the right direction. but a bastard 20g from sbr can make in the neighborhood of 425. However I'm not sure if thats wheel or crank. Ofcourse the supporting mods of fuel, exhaust, airflow, tuning will be needed. If you don't have headstuds and a metal headgasket don't think about going further then stock. a 14b or a t25 can pop a headgasket if conditions aren't friendly.

http://www.dsmtuners.com/forums/turbo-system-tech/323758-stock-appearing-turbo-2-3-a.html

 

[GK1707]

like they sad go big, and there's only one way to do it with a dsm! "go big or go home"

couldnt have said it better myself... its the onlii way to go with dsm's.

 

[smokem]

couldnt have said it better myself... its the onlii way to go with dsm's.

Not to knock you but then were dose the non turbos DSM's come into play?

 

[joyfil2001]

like they sad go big, and there's only one way to do it with a dsm! "go big or go home"

couldnt have said it better myself... its the onlii way to go with dsm's.

Are you serious? Really?

 

[dsm-onster]

Swap the 20g compressor onto the td06sl2 cartridge. Barring the large td06 compressor housing, this turbo then would be the exact same turbo as the 20g-6sl2 valued at $1000 by FP. You are a rebuild and a rebalance away from such a turbo.

 

[joyfil2001]

Swap the 20g compressor onto the td06sl2 cartridge. Barring the large td06 compressor housing, this turbo then would be the exact same turbo as the 20g-6sl2 valued at $1000 by FP. You are a rebuild and a rebalance away from such a turbo.

That's what I am hoping to do in the future if it is worth it. Maybe my man Justin can take care of this for me if and when I need it. I would assume the compressor cover would need to be machined to fit, correct?

 

[dsm-onster]

The compressor cover is the same as the 18g sl cover. So no machining

 

[Talon64]

I asked SBR about putting the td06 housing on the 20g but he said the housing would be to big for it. I got the td05 20g but I was looking on there website and they sell the td06 housing as an upgrade. I dont know if I said it wrong to him or not. Something about the td06sl2 will be to big. If not and its better to do that than I will. Than I will really have a sleeper

Ps have arp headstuds and oem headgasket.

 

[JusMX141]

SBR sells their Bastard 20G with the TD06H turbine as a choice for an upgrade, but as it comes it should have a TD05H turbine.

You cannot swap turbine or compressor housings between wheel sizes- any change would prompt the housing to be cut.

 

[Talon64]

The housing doesn't need to be cut I know that. Just the 18g housing will be bigger because its a td06sl2. I bought the one on the classifieds that doesnt have the housing so that is why I am interested now.

 

[dsm-onster]

You have a td06 compressor cover on your 20g? You said you have the sbr bastard 20g. This has the td05h compressor cover as pictured.

 

[->PrOjEcTGS<-]

Couldn't we just take the 18gsl2 and slap a 20g compressor wheel and machine the 18g's compressor cover to fit it?

 

[Talon64]

I have a 18g td06sl2 and I also have td05 20g without the exhaust housing.

 

[dsm-onster]

->PrOjEcTGS<-, the 18g and bastard 20g have the same compressor cover. Talon64 said he has an sbr bastard 20g.

 

[->PrOjEcTGS<-]

So, won't the 20g wheel fit right in then? Won't the cover have to be machined out a little bit for it to not scrape the cover?

 

[dsm-onster]

The 20g wheel and it's sbr td05h bastard 20g compressor housing machined to fit it will bolt right on to the fp 18g td06sl2 cartridge. . . In this case, these 18g and the 20g compressor housings are both td05 compressor housings. The 18g sl cartridge already accepts the td05 compressor cover that is wrapped around the 18g wheel. Why would it not accept the 20g wheel with it's already cut-to-fit td05 compressor cover. . . Am I missing something???

He's a rebuild and a balance away from a 20g td06sl2.

 

[JusMX141]

The housing doesn't need to be cut I know that. Just the 18g housing will be bigger because its a td06sl2.

I don't understand what you're talking about.


If you have an 18G and you want to upgrade the compressor to a 20G, you will have to cut the compressor housing.

If you have a TD05H turbine and you want to upgrade to a TD06SL2 or TD06, you will have to cut the turbine housing.



You cannot downsize wheels without replacing the housing.

 

[dsm-onster]

Justin, doesn't his 20g compressor wheel have a td05 compressor housing, jsut like his 18g compressor wheel? He said he has an sbr bastard 20g. If so, he can simply swap on the 20g wheel and its compressor cover on to the 18g sl2 centersection.

He could then swap on the 18g compressor wheel and it's td05 cover onto the sbr bastard 20g since it accepts a td05h cover. GEt it balanced and sell it to at least pay for all this, probably come out with cash in his pocket.

 

[JusMX141]

That is correct, Matt. I wasn't thinking we were talking about swapping parts between the two turbos I suppose.

 

[ed_dogg23]

So just food for thought. I just finished a tune on a buddys 2g which is 20g powered & stock 7 bolt and we ended up at 386.9 hp and 379 ft.lbs on 23-24 psi. I can't wait to install a manual boost controller and turn it up more. It will be over 400 for sure. 3 would personally go even bigger than the 20, but everyone has an opinion now don't they?

 

[->PrOjEcTGS<-]

Swap the 20g compressor onto the td06sl2 cartridge. Barring the large td06 compressor housing, this turbo then would be the exact same turbo as the 20g-6sl2 valued at $1000 by FP. You are a rebuild and a rebalance away from such a turbo.

Sorry, when I posted about slapping the 20g compressor wheel into the 18g06sl2 I didn't realize you had posted this. I guess I just confused a lot of people.

OP this is what I'd do. Send the turbos to justin and get the 20g wheel put on the 18g cartridge and rebuilt!

 

[Talon64]

So its almost pointless to send my turbo out than to forceperformance (even if its free)? So where would I be able to get this done? Will it be worth all this work? Once done I will have 18g td05 and 20g td06?

 

[my1997gsx]

While the 18g with the bigger housing will hold higher boost levels at higher RPM than the 20g. The 20g will make more power with that boost, the 16g housing hold its boost ok till about 25psi then will start to die off as you get higher in the RPM.

Just something to think about I have an Evo 3 16g currently on my car with a almost completely stock 7bolt with 160,xxx miles on it. All I have done to the motor is a cometic head gasket with ARP studs and 272 cams and with my 16g I put down 392.28 awdhp and 434.49 Torque last Saturday. So the TD05 housing can't be that bad especially with a 20g center section.

 

[my1997gsx]

So its almost pointless to send my turbo out than to forceperformance (even if its free)? So where would I be able to get this done? Will it be worth all this work? Once done I will have 18g td05 and 20g td06?

Im sure FP could put a 20g center in your 18g housing if you have them rebuild it it just wouldn't be free but I can't see it costing that much im sure. Then you could sell that SB 20g to gain some money back.
Just a thought.

 

[delta448]

Is the TD05 compressor housing on the bastard 20G also machined to match the A/R of the TD06 compressor housing? I'm assuming that a TD05 compressor housing has a smaller A/R. -y/n?

From what I've read, this smaller A/R compressor housing actually would favor efficiency under higher boost conditions, possibly adding a little more potential when pushed to the limit.

Good info Matt and Justin.

Larger A/R housings are sometimes used to optimize performance of low boost applications, and smaller A/R are used for high boost applications. However, as this influence of A/R on compressor performance is minor, there are not A/R options available for compressor housings.