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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 04-08-2009, 03:35 PM   #1 (permalink)
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Twin Turbo on my 6.5

I told you I would do it... I just picked up all the 10 feet of 304 stainless steel pipe I will need to build my... oh wait, I haven't told you yet I'm dumping my exhaust manifolds, and building stainless steel headers for a twin turbo setup on my 6.5l diesel.

I drove to the supplier and ordered up all the 304 stainless steel 90's and 45's I should need, they cost around $130 CDN, and will be in tomorrow. I got the 10' of 304 stainless steel pipe for $100 CDN, prices were cheap because we have a place here that specializes in alloys. All piping is schedule 10S, and a secret size.

I still have to get the 304 stainless steel plate for the flanges, I'll probably just have the machine shop cut it out of some of their stock.

I'm going to buy another GM-8 turbocharger too, and another Turbo-Master as well. I'm going to try and set it up so that I can just order two 3" down pipes, and they will fit both sides, I don't know if it can be done, but I'll try.

2001 GMC Sierra 2500HD, EC LB, 2WD, Duramax, 30mpg highway.
1996 Chevy Silverado 2500HD, RC LB, 4x4, 14 bolt FF 3.73 posi, Suncoast 4L80E, completely custom engine, true dual 4" exhaust
1987 GMC Sierra 1500HD, RC LB, 12 bolt 3.08 posi, built 383 stroker, TH400, 13" towing converter, 26mpg highway, 22 city, daily driver/drag truck. Swapping in a built TT Duramax/Allison. Looking for about 700RWHP
1995 Chevy 3500HD, RC, DRW, 13' for looong box, Dana 80 4.63 gears, double framed, 15,000 GVWR
Member #11 of the TLFTN club, ECLB Member #1
Originally Posted by bodis22
Quote this

Last edited by chevyinlinesix; 04-08-2009 at 03:35 PM.
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Old 04-08-2009, 04:02 PM   #2 (permalink)
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let me be the first to say:


keep us updated with the pics!!! lookin forward to this

1997 Chevy 2500 2wd RCLB 6.5L "F", 4.10's 8600gvw
93' LP
Boost Gauge, 3 inch DP, crossover, 3 inch straight piped side exit , T/M at 10 psi.
vacuum pump removed, 99.5' belt
D-tech PMD front mounted @ 156K ,Tekonsha Brake Controller, Amsoil 15w-40. 205KM
Hankook RF-10 265/75/16 'E'
synthetic diff and trans
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Old 04-08-2009, 04:11 PM   #3 (permalink)
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Sounds like a deivious plan in the making
'03 Silverado LB7. "Black and Blued"
EFI Live w/ DSP2 _ Suncoast IV w/ 1056 _ HTT 66/71/16 SS turbo _ ARP Studs _ DDP 50hp Nozzles _ PPE 160 Pump _ LBZ FPR _ Snow Stg 3 _ 4.5" Intake _ 5" Aero Turbine
Dewired and Painted engine

'77 K-10
Custom 52"/56" front/rear springs and rear shackle flip: 10" lift total/20"+ suspension travel _ D60/14blt _ 40" Swamper IROK's _ 383 w/nitrous _ Rock Crusher 4-speed
'97 Cadillac Deville
6000k in the front_1000watts in the back_Flowmasters
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Old 04-08-2009, 04:30 PM   #4 (permalink)
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She Don't Smoke!
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I have one thing to say....


I want haha. Except not the GM-8s
Dyno on April '09 - HorsePower: 228 , Torque: 376 YouTube Video
Quote: "Mind over Matter - I don't mind cause you don't matter!"

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Old 04-08-2009, 05:08 PM   #5 (permalink)
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May breathe a little easier, but our turbos already put out
as much as a 6.5 can handle - I wouldn't go thru that much
trouble, but I'll enjoy watching
Tookie LeBlanc
Current DD: 2012 VW Jetta TDI

Newest truck: (11/2011 - 3/2013, Sold!)
2009 Toyota Tacoma, TRD sport 4X4 crewcab
New truck: (December 2010 - October 2011, SOLD!)
2004 Chevy 2500HD, LB7, bone stock for now Hypertech III, K&N
cold air, Cooper Discoverer HTs, Rhino liner...

Old Truck: (2003 - 2010)
1997 GMC Sierra X/C longbed, 6.5 / 4L80E 240,000 + miles, original IP, 3rd PMD, (now remote mounted Dipaco)
deleted vac pump and home made TM, ceramic pads, Outlaw rims with new Cooper ATRs
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Old 04-08-2009, 05:26 PM   #6 (permalink)
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what are you going to do about fuel
1997 Chevy K1500 4X4 EC/SB 6.5TD/4L80E
3.42 G80, GM-8 Turbo gated @ 15 psi , KOJO Tune
2100 PSI Pop Pressure Bosch Injectors, Bosch Duratherm Glowplugs, Relocated PMD,
Leroy's Steel Braided Oil Cooler Lines, Tekonsha Voyager Brake Controller,
Flowmaster Crossover, 4 inch Diamond Eye Exhaust, Autometer Gauges 172K Miles
Member # 11 of The Young And Poor Club
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Old 04-08-2009, 05:28 PM   #7 (permalink)
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Sounds great cant wait to see how it looks. I have similar plans in mind when i get out of school
1993 GMC 6.5L 2500, 5 speed, 4X4. Reg. Cab long box. AMSOIL in engine and transmission.
Mods- T/M and boost & egt gauge, Custom AFE stage 2 intake, DMAX fan upgrade
Walbro FRB5 lift pump and CAT pre-filter.
3 in. downpipe to stock exhaust cut off at muffler and straight through muffler put on it.

1999 GMC 6.5L 2500, Auto, 4X4. Reg. Cab long box. PMD located in bumper
2001 GMC 6.6L 2500HD, Auto, 4X4. Extended Cab short box.

Brotherhood of Handshakers #120
Regular Cab Club Member #79
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Old 04-08-2009, 05:48 PM   #8 (permalink)
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While this would be and awesome looking engine bay especially with your intake, the only way you could have this work with two GM-8 turbos would be to either rev the motor up to 5K+ which is what Heath does on their salf flat truck. But unfortunetly the motor would be lazy down low in comparision to a mild modded 6.5 now. The turbine sections of the GM turbos is too big for 190ci+ per side and will make for a slow boost up. I don't think an array of components for the BW/IHI turbos are available to make a hybrid.

But you could change to Garrett turbos and have two custom turbos built using a T3/T4 hybrid and have wicked low end response and be able to further the top end efficiency using well selected T4 compressor sections and keep the RPM's to a realistic level by running matched T3 turbine sections.
1999 Silverado 3500 Dually 6.5L 4L80E Trans

ATA IC, Custom Upper intake, Heath GLE, Heath Cooling upgrade, Heath FSD, Bosch injectors and glows and a new 5521S IP, Fluidampener, B&M trans pan, Autometer gages Boost/Trans Temp/EGT Sony sound system

Proud member #794 of The 3500 Dually Club
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Old 04-08-2009, 06:05 PM   #9 (permalink)
Knows The 6.5
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Who cares what turbo's he starts with, turbos can always be swapped.
98 3/4ton 4x4 RC LB F vin L65 HO.
DSG gear set, gurdle and oil cooler, ported and half assed polished heads, HE351VE turbo, 3" downpipe, 2.25" xover, 3.5" DNA muffler and a 4" weed burner exhaust, NRK High idle switch kit and K47 relocated intake & AEM filter, Royal Purple in the trans, engine, and rear diff, 4 cobalt gauges, boost, pyro, trans temp and drive pressure. -6 CAT fuel system, Carter fuel pump. Sitting high on 35" Duratracs.
Bought it with a pooched engine and rebuilt it myself! 211,000 kms on the truck, 110,000km on the rebuild, still chuggin and still screamin.
If you're not drivin it hard, you don't deserve to drive it!

Member Lucky #7 of the TLFTN Club... Loud and proud

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Old 04-08-2009, 06:24 PM   #10 (permalink)
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can't wait to see this

1995 chevrolet Z-71 4x4 ext cab shortbox 400 liter slip tank and delta chrome tool box 33 inch toyo mud terrains updated rims custom nerf bars 10,000 pound warn winch air bags and torsion bars cranked air box mod 2 stage high idle
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