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View Full Version : Turbo charging a 6.2 N/A GM Diesel-what size turbo?



turbovanmanČ
05-31-2007, 01:51 PM
Alot of guys use the GM 6.5 turbo setup with the Borg Warner turbo, which is close to the Holset in size but can't find the specs on the BW. Anyhow, I wil be doing a remote setup on my van due to its 10 times easier and you can't run the regular 6.5 turbo setup due to no space. 10 psi non intercooled is the max with the BW turbo so will a T04E 50 trim, stage III wheel and .63 housing be enough? I can always get a larger a/r ex housing?

Clay
05-31-2007, 02:18 PM
cant leave anything alone can you????????

SL#189
05-31-2007, 02:21 PM
:popcorn:

I'm curious on this as well :amen:

turbovanmanČ
05-31-2007, 02:27 PM
cant leave anything alone can you????????

Nope and have you ever DRIVEN an N/A 6.2? it bloody awful. I will have the intake and IP done, headers, 2.5 inch mandrel y-pipe and 3 inch back so adding a turbo will be a piece of cake. :D

Clay
05-31-2007, 02:41 PM
Yeah, one time. thats all it took. POS GM diesels! ;)

turbovanmanČ
05-31-2007, 03:01 PM
Yeah, one time. thats all it took. POS GM diesels! ;)


Hahhaaa, apart from the lack of power, I like it. Diesel is cheaper by 25 cents a litre, less maintenace and a heavy GetAWay van I get 20 mpg. :thumb:

Aries_Turbo
05-31-2007, 06:02 PM
are you going to turn up the fuel then too?

actually how do you tune a diesel. I assume you turn up the fuel till it cant burn anymore and it makes no more power, then you turn up the boost and keep an eye on the egts and af?

Brian

turbovanmanČ
05-31-2007, 06:24 PM
are you going to turn up the fuel then too?

actually how do you tune a diesel. I assume you turn up the fuel till it cant burn anymore and it makes no more power, then you turn up the boost and keep an eye on the egts and af?

Brian


Yep, I have a different IP I am putting on soon, its off a Non egr engine and they put out more fuel-I have a EGR engine right now, C code. EGR less are J codes and the J code intakes flow alot better too. Basically, you turn an adjustment screw and watch your EGT's at wot. EGT's are backwards on a Diesel, lean is lower EGT's which isn't bad, richer makes the EGT's go up and melt city. I believe its around 1000-1200 when you hear BOOM.

Aries_Turbo
05-31-2007, 10:19 PM
so does the turbo lean it out then and lower the egts?

Brian

turbovanmanČ
05-31-2007, 10:25 PM
so does the turbo lean it out then and lower the egts?

Brian


As far as I have read, yes, but of course, you make less power, hence turning up the IP to compensate.

Aries_Turbo
05-31-2007, 11:01 PM
yeah but it seems that youd get to a point where there is alot more fuel going in but its lean enough that its cooler but there is still more power than to begin with.

Brian

turbovanmanČ
06-01-2007, 12:25 AM
yeah but it seems that youd get to a point where there is alot more fuel going in but its lean enough that its cooler but there is still more power than to begin with.

Brian


Not sure, all I know is they do it all the time and they just turn the IP up and it works. You can't go too far otherwise Kaboom.

Frank
06-01-2007, 12:33 PM
I wouldnt bother with the BW... go for the basic upgraded Holset that the Cummins guys use.

turbovanmanČ
06-01-2007, 12:59 PM
I wouldnt bother with the BW... go for the basic upgraded Holset that the Cummins guys use.


I want to use my old T3/T4? will it work? bigger a/r ex housing needed?

Frank
06-01-2007, 01:03 PM
I think it is way to small because the design is not such to support it. If it was a T3/T04B it might be better.

turbovanmanČ
06-01-2007, 01:05 PM
Even though I am not going for huge gains, just some more power?

If that won't work, I'll just get the GM turbo, there pretty cheap and I know they give good power up to 10 psi, which is all I can run with that turbo and current engine setup.

Frank
06-01-2007, 01:06 PM
Then do that. I think that 50 trim will be way to small.

turbovanmanČ
06-01-2007, 01:08 PM
Ok, thanks.

What size comp wheel do you think would work?

Aries_Turbo
06-01-2007, 06:04 PM
the compressor isnt the issue. its the exhaust side thats too small. .63 stg 2 for a 6.5L motor? thats way too small. the 50 trim part wouldnt be too bad but it might be a little small.

Brian

Frank
06-01-2007, 06:38 PM
Just get a holset... 35 varient or a 40

DeckSetter
06-01-2007, 07:05 PM
HX40 is way too much turbo for mild gains. People weld the wastegate shut on the HY35W on the 4BT all the time (Cummins 3.9 4 cylinder) and love it. They say it's the perfect turbo for that 3.9. Your 6.2 V8 would HATE a turbo smaller than that I bet.

Are you limited to 10psi because of the turbo itself or engine internals?

Clay
06-01-2007, 07:20 PM
Are you limited to 10psi because of the turbo itself or engine internals?

from what Ive heard/read/seen of that diesel.... its the internals

turbovanmanČ
06-01-2007, 08:19 PM
HX40 is way too much turbo for mild gains. People weld the wastegate shut on the HY35W on the 4BT all the time (Cummins 3.9 4 cylinder) and love it. They say it's the perfect turbo for that 3.9. Your 6.2 V8 would HATE a turbo smaller than that I bet.

Are you limited to 10psi because of the turbo itself or engine internals?

Yes and no, these N/A's have a 22:1 compression ratio, the turbo units are 18:1. The internals are also a bit weak but with proper tuning, lower compression, you can run 15-18 psi I believe. Its also not IC'd so they say stock engine, 10 psi max.

turbovanmanČ
06-01-2007, 08:20 PM
the compressor isnt the issue. its the exhaust side thats too small. .63 stg 2 for a 6.5L motor? thats way too small. the 50 trim part wouldnt be too bad but it might be a little small.

Brian

Well its a 6.2L, I have a Stage 3 wheel with a .63 housing. Like I said, what about running a larger A/R housing. I did some digging, apparently, the GM turbo's are close to a 50 trim cold side. :eyebrows:

Aries_Turbo
06-02-2007, 01:05 AM
im thinking full t4 exhaust side.... its still a 6.2L v8... not a 2.5L 4banger trying to push all that volume through the turbine.

Brian

turbovanmanČ
06-02-2007, 03:15 AM
im thinking full t4 exhaust side.... its still a 6.2L v8... not a 2.5L 4banger trying to push all that volume through the turbine.

Brian


You lost me. It is a T4 exhaust housing. Like I suggested, what about running a larger A/R turbine housing?

Aries_Turbo
06-02-2007, 11:53 AM
i assume you are trying the turbo from your van..... its a t3 exhaust side.. .63 stage 3 right? thats too small. .82 or 1.0x would be better if you really want to use that turbo. I guess swapping for a full t4 exhaust side would be too much of a hassle. :)

Brian

turbovanmanČ
06-02-2007, 12:10 PM
i assume you are trying the turbo from your van..... its a t3 exhaust side.. .63 stage 3 right? thats too small. .82 or 1.0x would be better if you really want to use that turbo. I guess swapping for a full t4 exhaust side would be too much of a hassle. :)

Brian


Sorry, yeah right, durrrrrr, T3 exhaust side. Thats what I was thinking, just grab a larger housing, :thumb:

TurboGLH
06-02-2007, 12:40 PM
I've got a turbo that might be up your alley Simon. The only problem is that I have no idea who makes it, it has no identifying marks or tags on it.

It is however brand new, not rebuilt. 1.00 a/r turbine and .63 compressor, wheel sizes are close to a p-trim T4 (2.512/2.892) and a between an S and V trim T04B (2.102/2.988)

It's a divided tang, but it uses a T3 flange and a V-band outlet.

I've had it sitting in a box for almost three years at this point and I'm very open to it finding a new home at this point, some place where I don't have to move or trip over it any more.

http://www.turbo-mopar.com/forums/photopost/data/695/P1010800_1.JPG
http://www.turbo-mopar.com/forums/photopost/data/695/P1010801_1.JPG
http://www.turbo-mopar.com/forums/photopost/data/695/P1010802_1.JPG
http://www.turbo-mopar.com/forums/photopost/data/695/P1010803_1.JPG

turbovanmanČ
06-02-2007, 02:34 PM
Frank, what do you think?

Chris, if Frank thinks its ok, we'll work something out, :nod:

Aries_Turbo
06-02-2007, 07:50 PM
only potential issue... no wastegate and no water cooling. if you let it cool down after romping and if you dont mind no wastegate (many diesels dont have them.... the boost is regulated as a function of how much fuel goes in) you should be fine with that.

if you find that it boosts too high, get some cheap used older audi external wastegates and weld them on before the turbine.

Brian

turbovanmanČ
06-02-2007, 08:48 PM
I wasn't going watercooled anyhow, the plumbing would be a nightmare and Diesels only go to around 900 EGT's, :eyebrows: :nod:

Hmmmmm, would have to run an external wastegate otherwise I would blow it up for sure, doh!

Aries_Turbo
06-02-2007, 08:57 PM
ebay specials arent that costly either.

Brian

turbovanmanČ
06-02-2007, 09:13 PM
Ebay turbo's or external wastegates?

Yeah, just keeping options open so I have lots of time to find the right turbo, :nod:

Aries_Turbo
06-02-2007, 11:41 PM
wastegates :)

TurboGLH
06-03-2007, 12:11 PM
Frank, what do you think?

Chris, if Frank thinks its ok, we'll work something out, :nod:

Let me know what you decide, for now I'm gonna box it back up and put it away.

turbovanmanČ
06-03-2007, 01:52 PM
Let me know what you decide, for now I'm gonna box it back up and put it away.

Sure, still waiting for Franks input, :nod:

Frank
06-03-2007, 07:59 PM
For Chris' turbo, even though the compressor is smaller then what I would like to see, the turbine is very nicely sized for your project. It will give you power where you need it.


Frank