See some statements that people are running 4" turbo/back systems on 6.5td's. I can't find anything other than 3" downpipe w/transition to 4" back, any full 4" systems out there, or?
See some statements that people are running 4" turbo/back systems on 6.5td's. I can't find anything other than 3" downpipe w/transition to 4" back, any full 4" systems out there, or?
99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.
I don't think that anyone manufactures bigger than 3" for the down pipe then 4" the rest of the way. I built my own out of 3.5" mandrel bends, I personally don't see 4" fitting without major rubbing. My 3.5" is bad enough.
white '93 K2500 started it all..
red '94 K3500 old faithful
black '93 K3500 daily driver
'83 G20 conversion van
'74 C65 truck diesel conversion...
Ditto what DD said above - actually I'm surprised he even got a 3.5" downpipe to fit! 3" downpipe is pretty much the standard. I wonder if a bigger downpipe would even show any legitimate gains? The biggest factor is probably having the pipes mandrel bent.
1998 K2500 Suburban 6.5L TD 3.73 rear, Ron Schoolcraft 18:1, Kennedy ECM & IC, Timing gears, Splayed main caps, 3.5" Kennedy Exhuast/No Cat, K&N Filter, Boost/Tranny Temp/EGT(Pre Turbo), Ceramic-coated Manifolds, 195 Stat's, 265/75's (VSSB Adjusted) 7,000lbs (on a scale) Remote Mount Oil Filter, Remote Oil Pressure Sensor
I'm diggin deep into this and going to somehow fab an oval 4" downpipe to clear chassis and motor. I already have a 3" inside diameter turbine housing connector for a downpipe and thinking a 3" round to 4" oval transition will work using oval pipe for downpipe then back to a 4" round outlet for rest of exhaust.
What I'm seeing is restriction at turbine housing going to outlet, porting and a larger 4" diameter downpipe would work wonders for the 6.5td.
The following link will give ya an idea of parts that can be used.
http://www.spintechmufflers.com/spin...ntechindex.asp
99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.
Getting the bends in it for a down pipe would be interesting
Can they be bent? Maybe by getting the pipe cherry red where the bend needs to be?
95C3500.Ext.Cab 97 Cooling mods. DSG Gear-1.95 TDCO. Bilstein Shocks. Firestone Air Bags. FSD Cooler. Banks EX System. Egt,Boost & IAT Gauges. JK High Flow/pop Injectors. Turbo-Master. Max-E 2.0. Water/Alky Injection. Amsoil Dual Bypass. Baldwin filter. aFe Air filter, Air box & Turbo Mods. Power Service Product. Large Duels 235/85-16. Tool Box\'s & truck, 8200 lbs.
IMO, 3" is plenty big enough with the GM turbo. No matter what it is still the biggest restriction in the system. Bigger can't hurt though. Another thing to consider is how well does oval tubing flow?
white '93 K2500 started it all..
red '94 K3500 old faithful
black '93 K3500 daily driver
'83 G20 conversion van
'74 C65 truck diesel conversion...
Building an Oval Downpipe that is. Does that mean you will be using the new downpipe you just got? Thats ok - Ill just stop anguishing for the UPS man to stop at my door with it! RickOriginally Posted by DA BIG ONE
95K3500.Ext.Cab 4L80E 200,000 + miles; 3 gauge pillar pod pre turbo temp- boost- trans temp. 97 Cooling mods Fan / fan clutch, dual Tstat and water pump, Hi Pop Injectors, fast heat glow plugs, DSG gears, intake snorkel removed, air box mods, hi idle mod, dMax pipes for exhaust, FSD mounted on intake, Monroe Shocks. Homemade cooler lines, H7B coolers replace stock trans and oil devices, remote mount with 2 quart Wix filter aux micron filter, OPS relay and headlight boosters, glow plug extender, and an FPPF cocktail in every tank.
NOPE, That pipe is different and yours, however, after checking it's sitting all packed up for shipping in the back of my son's truck when it is supposed to be on it's way to you, SORRY!Originally Posted by stingthieves
99 GMC SUB, 2500, 4x4, 6.5 TD (F) #H32 enhanced blk, Phaser timing set, B&D IC, 3" ATS exh, K&N w/prefilter, 4WD NVG 246, 4L80E kevlar Transgo off road/tow mods/B&M supercooler, 14 FF MagTec w/locker 3.42:1, 9.25" IFS frt/diff 3.42:1 w/ARB locker, AutoMeter Boost & pre-turbo pyro meter, 12,000 lb hydro winch, Warn classic bumper w/brushguard & diesel scoop, Max E-torq Stage 3, hi pop inj, oil bypass sys, on board air comp for front ARB locker & tire inflation, DynaView driving/auto-cornering lts, DZ nerfs, A/T 285/75/16 SilentArmor 3750 lb rated on 3750 lb rated Alcoa, 3 IP drivers 2 r spares.