Homemade Twin Turbo kit? Help please?

JMP'S PERFORMANCE · 10-30-2009, 11:53 PM

Hey I have some questions regarding my twin turbo kit that I just built.

I am running the HX35 as the top charger and an HT3E as the bottom charger. The top still has the wastegated 12 cm housing and the bottom has the unwastegated 20 cm exhaust housing. I will have to get the specs on the compressor wheel of the HT3E. Seems to spool pretty quick and runs great lots of power, but I make too much boost the turbo is boosting to 70-80 psi somewhere in there. I want to limit it to somewhere in between 55-65 psi.

Can I run an external wastegate of some sort?

What did you use?

What size should I look for or is there any other way to limit boost by different exhaust housings or anything?

Thanks, Justin

__________________
96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch.
FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

sstockton · 10-31-2009, 12:06 AM

Do you know what PR each turbo is running at? Odds are, you are spinning the top charger way too much and need to regulate it a bit, Via an external wastegate. Also, a larger housing on the bottom charger will help spool up. Knowing what each turbo is doing is key to tuning your twins. 55psi, will have them each at around a PR of 2.7 assuming you are at sea level and they are balanced. 1 could also be doing more work than the other. If you can find the maps for your chargers, that will greatly help you in getting them where they are most efficient.
Sean

__________________
2000 2500 Reg. Cab 4x4. Built trans, Twins, Edge drag box, Sticks, Studs, cam, Gauges, etc...
09 2500 6.7L QCLB 4x4, G56, all stock for now.

Last edited by sstockton : 10-31-2009 at 12:27 AM.

gwhammy · 10-31-2009, 12:20 AM

You need to get around the hx alot more. I ran a hx35 with a 38 mm external wastegate and the stock wastegate along with a 3e with a 22 cm exhaust housing. It worked real good and made about 65 lbs. of boost with a 100 plate on a 215 pump and 370 injectors. Top turbo is the problem but the 20 cm exhaust housing probably ain't helping either.

__________________
01,qcsb,fwd,he351-3b,adrenaline,pulse,200injectors,5in.stacks,5disk converter
02,qcsb,fwd,35-40,edge juice attitude,2.5mach injectors,4in.exhaust,4 disk converter,

JMP'S PERFORMANCE · 11-02-2009, 07:59 PM

I need to clarify what you are saying! The Hx-35 has the stock wastegate and the 3E with 22 cm housing has the 38 mm external wastegate, Correct? Or is it the other way around? If it is the other way around where would you put the 38 mm wastegate on the HX35? I could see mounting it in the manifold that comes off the back of the HX35 and goes to the 3E to wastegate the 3E? As of now I am running the stock wastegate on the HX35 set at stock level no boost controller or anything. If I get around the HX35 more wont that just help to spool up the 3E more on the top end or will it help it spool the 3E earlier to give more low end power? Will the bigger exhaust housing help keep the top end boost pressure down or what does that help? Please clarify, Thanks, Justin

__________________
96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch.
FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

JMP'S PERFORMANCE · 11-02-2009, 08:07 PM

I dont know what PR is? Is that the Pressure Ratio? Please elaborate! Where and how would you put an external wastegate on the HX35? I could see where to put it to wastegate the 3E. What size exhaust housing would you use on the bottom? Thanks

__________________
96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch.
FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

JMP'S PERFORMANCE · 11-04-2009, 08:21 PM

How will a larger charger on the bottom help spool up I thought that the bigger the exhaust housing the slower the spool up? How does the exhaust housing size affect spool up versus top end boost?

__________________
96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch.
FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

10-30-2009, 11:53 PM	#1 (permalink)
JMP'S PERFORMANCE Cummins Fanatic Join Date: Sep 2006 Location: Wasilla, Ak Posts: 100 Thanks: 0 Thanked 0 Times in 0 Posts JMP'S PERFORMANCE's Truck Pics	Homemade Twin Turbo kit? Help please? Hey I have some questions regarding my twin turbo kit that I just built. I am running the HX35 as the top charger and an HT3E as the bottom charger. The top still has the wastegated 12 cm housing and the bottom has the unwastegated 20 cm exhaust housing. I will have to get the specs on the compressor wheel of the HT3E. Seems to spool pretty quick and runs great lots of power, but I make too much boost the turbo is boosting to 70-80 psi somewhere in there. I want to limit it to somewhere in between 55-65 psi. Can I run an external wastegate of some sort? What did you use? What size should I look for or is there any other way to limit boost by different exhaust housings or anything? Thanks, Justin __________________ 96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch. FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

11-02-2009, 07:59 PM	#4 (permalink)
JMP'S PERFORMANCE Cummins Fanatic Join Date: Sep 2006 Location: Wasilla, Ak Posts: 100 Thanks: 0 Thanked 0 Times in 0 Posts JMP'S PERFORMANCE's Truck Pics	gwhammy I need to clarify what you are saying! The Hx-35 has the stock wastegate and the 3E with 22 cm housing has the 38 mm external wastegate, Correct? Or is it the other way around? If it is the other way around where would you put the 38 mm wastegate on the HX35? I could see mounting it in the manifold that comes off the back of the HX35 and goes to the 3E to wastegate the 3E? As of now I am running the stock wastegate on the HX35 set at stock level no boost controller or anything. If I get around the HX35 more wont that just help to spool up the 3E more on the top end or will it help it spool the 3E earlier to give more low end power? Will the bigger exhaust housing help keep the top end boost pressure down or what does that help? Please clarify, Thanks, Justin __________________ 96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch. FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

11-02-2009, 08:07 PM	#5 (permalink)
JMP'S PERFORMANCE Cummins Fanatic Join Date: Sep 2006 Location: Wasilla, Ak Posts: 100 Thanks: 0 Thanked 0 Times in 0 Posts JMP'S PERFORMANCE's Truck Pics	Sstockton I dont know what PR is? Is that the Pressure Ratio? Please elaborate! Where and how would you put an external wastegate on the HX35? I could see where to put it to wastegate the 3E. What size exhaust housing would you use on the bottom? Thanks __________________ 96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch. FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

11-04-2009, 08:21 PM	#6 (permalink)
JMP'S PERFORMANCE Cummins Fanatic Join Date: Sep 2006 Location: Wasilla, Ak Posts: 100 Thanks: 0 Thanked 0 Times in 0 Posts JMP'S PERFORMANCE's Truck Pics	Twins How will a larger charger on the bottom help spool up I thought that the bigger the exhaust housing the slower the spool up? How does the exhaust housing size affect spool up versus top end boost? __________________ 96 Ram 2500 Cummins; #10 TST fuel plate, star wheel adj,17* timing, headstuds, 3k gsk washer, 0.020 Marine Headgasket,O ringed head, 5spd, South Bend clutch. FARMBOYS DIESEL @ farmboysdiesel.com :thumbsup

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10-31-2009, 12:06 AM	#2 (permalink)
sstockton Cummins Fanatic Join Date: Dec 2008 Location: Sonoma, Ca Posts: 173 Thanks: 2 Thanked 21 Times in 21 Posts sstockton's Truck Pics	Do you know what PR each turbo is running at? Odds are, you are spinning the top charger way too much and need to regulate it a bit, Via an external wastegate. Also, a larger housing on the bottom charger will help spool up. Knowing what each turbo is doing is key to tuning your twins. 55psi, will have them each at around a PR of 2.7 assuming you are at sea level and they are balanced. 1 could also be doing more work than the other. If you can find the maps for your chargers, that will greatly help you in getting them where they are most efficient. Sean __________________ 2000 2500 Reg. Cab 4x4. Built trans, Twins, Edge drag box, Sticks, Studs, cam, Gauges, etc... 09 2500 6.7L QCLB 4x4, G56, all stock for now. Last edited by sstockton : 10-31-2009 at 12:27 AM.

10-31-2009, 12:20 AM	#3 (permalink)
gwhammy Cummins Enthusiast Join Date: Apr 2006 Posts: 223 Thanks: 0 Thanked 1 Time in 1 Post gwhammy's Truck Pics	You need to get around the hx alot more. I ran a hx35 with a 38 mm external wastegate and the stock wastegate along with a 3e with a 22 cm exhaust housing. It worked real good and made about 65 lbs. of boost with a 100 plate on a 215 pump and 370 injectors. Top turbo is the problem but the 20 cm exhaust housing probably ain't helping either. __________________ 01,qcsb,fwd,he351-3b,adrenaline,pulse,200injectors,5in.stacks,5disk converter 02,qcsb,fwd,35-40,edge juice attitude,2.5mach injectors,4in.exhaust,4 disk converter,