Compound Turbo set up

smokinchevy · #1 11-19-2009, 09:47 PM

I am eventually gonna buy a 1st generation diesel and ofcourse I have got to make some power with the thing for sure

I was thinking goign with a compound set up,now taking into consdierationthe limitations with the rotary pump and the fact there is'nt anything for after market head gaskets on 1st gens I have came up with this plan for a compund set up...

get a fresh cummins head gasket and maybe get some head studs,either way tourqe it down to 130,then take and get two stock turbos,one with a 14 or 16 cm exhaust houseing on it and then take a stock one with the 21 cm exhaust houseing on it

run the smaller one as the first turbo in the set up and then have that going into the bigger one,now from wat I know that is bassically wat they do with compounds so in theory that would be a great cheap set up and would work really good for providing boost to the engine with out over doing it

I am just looking for some opions on how that would work

I will probally post a list of the other things I want to put in the truck soon

tower_ofpower · #2 11-19-2009, 11:08 PM

two stock turbos means they will have the same "map" and therefore flow the same ammount of air; just one will be laggier than the other. most compounds run identical exhaust housings but their "maps" are relatively close. where one turbo breaks out of efficiency the next one just starts to break into its efficiency. by running a turbo thats efficient down low and not so much up top; you get gobs of turbo response; then you throw the complete opposite behind it for mid to high rpm response

captain_stabbin · #3 11-20-2009, 12:13 AM

RSWORDS · #4 11-20-2009, 04:16 PM

Originally Posted by tower_ofpower

two stock turbos means they will have the same "map" and therefore flow the same ammount of air; just one will be laggier than the other. most compounds run identical exhaust housings but their "maps" are relatively close. where one turbo breaks out of efficiency the next one just starts to break into its efficiency. by running a turbo thats efficient down low and not so much up top; you get gobs of turbo response; then you throw the complete opposite behind it for mid to high rpm response

Most compounds do not run identical exhuast housings.

RSWORDS · #5 11-20-2009, 04:18 PM

Originally Posted by smokinchevy

I am eventually gonna buy a 1st generation diesel and ofcourse I have got to make some power with the thing for sure

I was thinking goign with a compound set up,now taking into consdierationthe limitations with the rotary pump and the fact there is'nt anything for after market head gaskets on 1st gens I have came up with this plan for a compund set up...

get a fresh cummins head gasket and maybe get some head studs,either way tourqe it down to 130,then take and get two stock turbos,one with a 14 or 16 cm exhaust houseing on it and then take a stock one with the 21 cm exhaust houseing on it

run the smaller one as the first turbo in the set up and then have that going into the bigger one,now from wat I know that is bassically wat they do with compounds so in theory that would be a great cheap set up and would work really good for providing boost to the engine with out over doing it

I am just looking for some opions on how that would work

I will probally post a list of the other things I want to put in the truck soon

There are aftermarket HG's for 1st gens, same as 12v 2nd gens. But use a stock Cummins part!

For your turbo a quick spooling setup is key to power in a 1st gen. You can use 2 similer tubos in a compound set up, defets the purpose.

An hx40/hx60 would be a nice setup.

**94 12valve** · #6 11-20-2009, 06:46 PM

hx35 or hx40 over an ht3b is a very popular set up as well.

If I were makeing a set for a 1st gen I would use a he351 with an external gate over a s471

tower_ofpower · #7 11-20-2009, 08:32 PM

Originally Posted by RSWORDS

Most compounds do not run identical exhuast housings.

sorry for the mis-information then bobby; just figured they'd use the same housing sizes to keep flow and drive pressure balanced between the two

smokinchevy · #8 11-22-2009, 04:42 PM

u'll have to forgive me for asking about this but What do these models of turbos u just gave me dome from?

like are they from different generations of cummins or are they after market ones that u buy

I drive a non turbo Chevy 6.2 so I am still rather unfamiler with all the turbo terms and stuff

**seandonato73** · #9 11-22-2009, 09:55 PM

well then welcome to DB, some are hybrids, some are off of a "C" and bigger cummins and some are after market. there are a lot to choose from on the market, looking at turbo maps will give you a good idea of which to use, and i may even help to talk to someone that knows a lot about turbo's. i'm gonna keep running a single, come tax time i'm gonna get an s300 62/65/14 should do nicely. but a lot of turbo chargers is a matter of opinion as to who likes what

**94 12valve** · #10 11-24-2009, 12:31 PM

Originally Posted by 94 12valve

hx35 or hx40 over an ht3b is a very popular set up as well.

If I were makeing a set for a 1st gen I would use a he351 with an external gate over a s471

Originally Posted by smokinchevy

u'll have to forgive me for asking about this but What do these models of turbos u just gave me dome from?

like are they from different generations of cummins or are they after market ones that u buy

I drive a non turbo Chevy 6.2 so I am still rather unfamiler with all the turbo terms and stuff

hx35 is the stock turbo on a 2nd gen cummins form mid 94 to 01ish ( some had the hy)
the he351 is the stock turbo off a 04.5-07 CR cummins
for the s471
the S is the compressor wheel type, the 400 is the frame, and the 71 is the size of the compressor wheel inlet.

1stgenjunkie · #11 11-24-2009, 02:15 PM

I plan on running Hx35/S400, will be starting this project on christmas break, Man I cant Wait!!!

smokinchevy · #12 11-29-2009, 11:31 PM

alright so the 400 is like the size of the body part of the turbo type thing?

and thanx for letting me know wat turbos go to which truck that is really helpful to know

stillcummin · #13 11-30-2009, 05:25 PM

the ht3b came on the cummins ntc 855.If i did compounds in a 1st gen id do some good work on the ve pump.there are guys out there that can double the output safely with a 13mm plunger.Without enough fuel compounds will be useless.Unless you ran a small set,which by then why wouldnt you just upgrade the fuel pump?Why go through the trouble just for "instant boost"?

RSWORDS · #14 11-30-2009, 05:44 PM

Originally Posted by stillcummin

the ht3b came on the cummins ntc 855.If i did compounds in a 1st gen id do some good work on the ve pump.there are guys out there that can double the output safely with a 13mm plunger.Without enough fuel compounds will be useless.Unless you ran a small set,which by then why wouldnt you just upgrade the fuel pump?Why go through the trouble just for "instant boost"?

there is no plunger in teh VE pump, you are thinking of teh P-Pump, you can get a 14mm Head and rotar fro teh VE's.

**muskrat** · #15 11-30-2009, 06:07 PM

Originally Posted by stillcummin

the ht3b came on the cummins ntc 855.If i did compounds in a 1st gen id do some good work on the ve pump.there are guys out there that can double the output safely with a 13mm plunger.Without enough fuel compounds will be useless.Unless you ran a small set,which by then why wouldnt you just upgrade the fuel pump?Why go through the trouble just for "instant boost"?

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