Drill out your stock 12cm turbo housing(12V) - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 23 (permalink) Old 01-01-2009, 03:58 AM Thread Starter
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Drill out your stock 12cm turbo housing(12V)

This is mostly for EGT reduction after fueling mods have been done. The stock HX35W has a wastegated 12cm housing that is only gated to 3 cylinders. This mod lets all 6 blow out the gate, and promotes better flow.

I helped a friend do this to his 96 12V 5 spd(215hp). His has a 0 plate full forward, 3k GSK, ScottyII intake, and timing to 15*.

-Take off the turbo
-Remove the 5 or 6 bolts to the exhaust housing(13mm head)
-Remove the cover
-Remove the E-clip from the wastegate lever and flip open the flapper.
-Now drill out the divider with a 3/4" drill bit. You could use a little bigger bit to hogg out the original size, but a 3/4" bit is much easier to find for most people.
-Clean out the shavings
-Re-install the E-clip and the gate flapper.
-Re-install the cover & bolts
-Re-install the turbo, and check for leakage.
If you used oil for the drill bit, it'll burn off really quickly once fired up.
After the mods, he noticed EGT was totally controllable pulling a 2000 pound trailer up mountain passes. Pre-turbo temp readings were said to be, "Very hard to break 1100*". His booost is also controlled down to 36 pounds, where he was hitting 42 pounds before.
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Dale

my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
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Last edited by nevrenufhp; 01-31-2009 at 10:49 PM.
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post #2 of 23 (permalink) Old 01-31-2009, 10:26 PM
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the day i graduated high school
would it be worth it to do to a bascally stock truck maybe once in a while haul a car trailor and also turned up the fuel a little?

97' Cummins 2500 Gauges from glowshift (EGT, boost) Fuel pressure gauge from auto-meter. Stage 2 airbox, boost elbow, barrels & plungers turned.Custom fuel plate,Airdog 150gph.AFC mods & 3K GSK.SDX injectors (stage 3 140hp).Drilled wastegate.Converted to a NV4500 with a double disc. Being restored from the ground up


01' Cummins 2500 (dads) with a Hotrod pump,100hp injectors, Fass 150, Edge juice with attitude,also plug and power chip,stage 2 ice box,4 1/2 exgaust pipe,HX40

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post #3 of 23 (permalink) Old 01-31-2009, 10:48 PM Thread Starter
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You probably wouldnt notice anything until you have the plate full forward, and/or a different plate. If you have more mods planned, it would be a good afternoon project to do.

Dale

my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
www.freewebs.com/nevrenufhp

Last edited by nevrenufhp; 01-31-2009 at 10:53 PM.
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post #4 of 23 (permalink) Old 01-31-2009, 11:12 PM
Let it rip tator chip!
 
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the day i graduated high school
evently i want too wanna get it rebuild and sled pull with it but cant do nothin much till i get in the marines and get some money jobs round here aint payin good lol

97' Cummins 2500 Gauges from glowshift (EGT, boost) Fuel pressure gauge from auto-meter. Stage 2 airbox, boost elbow, barrels & plungers turned.Custom fuel plate,Airdog 150gph.AFC mods & 3K GSK.SDX injectors (stage 3 140hp).Drilled wastegate.Converted to a NV4500 with a double disc. Being restored from the ground up


01' Cummins 2500 (dads) with a Hotrod pump,100hp injectors, Fass 150, Edge juice with attitude,also plug and power chip,stage 2 ice box,4 1/2 exgaust pipe,HX40

Riding Dirty #60
B.O.M.B Squad #79
Singles Club #260
Special thanks too


http://www.southerndieselx.com/
xtremediesel.com
dieselperformance.com
cptrucks.com
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post #5 of 23 (permalink) Old 02-04-2009, 07:35 PM
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could you do the samething on a 24v with hx 35
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post #6 of 23 (permalink) Old 02-04-2009, 08:06 PM
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Quote:
Originally Posted by nevrenufhp View Post
This is mostly for EGT reduction after fueling mods have been done. The stock HX35W has a wastegated 12cm housing that is only gated to 3 cylinders. This mod lets all 6 blow out the gate, and promotes better flow.

I helped a friend do this to his 96 12V 5 spd(215hp). His has a 0 plate full forward, 3k GSK, ScottyII intake, and timing to 15*.

-Take off the turbo
-Remove the 5 or 6 bolts to the exhaust housing(13mm head)
-Remove the cover
-Remove the E-clip from the wastegate lever and flip open the flapper.
-Now drill out the divider with a 3/4" drill bit. You could use a little bigger bit to hogg out the original size, but a 3/4" bit is much easier to find for most people.
-Clean out the shavings
-Re-install the E-clip and the gate flapper.
-Re-install the cover & bolts
-Re-install the turbo, and check for leakage.
If you used oil for the drill bit, it'll burn off really quickly once fired up.
After the mods, he noticed EGT was totally controllable pulling a 2000 pound trailer up mountain passes. Pre-turbo temp readings were said to be, "Very hard to break 1100*". His booost is also controlled down to 36 pounds, where he was hitting 42 pounds before.
i think its a wise idea to also note that you should use air tools when removing the 13mm bolts if at all possible. Most of us have gotten those exhaust housings pretty hot, and its very possible to snap a bolt or two when trying to remove them. I snapped two when switching housings back for my twins....just a precaution, use it as you wish.

Eric

1994 Dodge Ram 2500

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post #7 of 23 (permalink) Old 02-04-2009, 11:40 PM Thread Starter
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Yes, you can do it on a 24V's HX35. You just can't do it to the HY35.

Dale

my daily driver:67 F100, 300 4V, cammed, 4 spd.
or, 08 Subaloser Forester, 2" lift.
work rigs: 94 IH 4900, DT466(originally 230hp), #0 fuel plate, tighter gov springs, 22* timing
or, 06 IH 7400, DT466E, 300hp


My Low Buck fuel rate site:
www.freewebs.com/nevrenufhp
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post #8 of 23 (permalink) Old 02-09-2009, 06:51 PM
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I've got one that has a bigger flapper put on it and a 38 mm hole and the divider cut out. I've never run it but it ought to anything a hx35 can handle in a single or twins.
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post #9 of 23 (permalink) Old 09-14-2009, 04:53 AM
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the day i graduated high school
with drillin it out to a 3/4 drill bit what could you do to regain that lost boost by drillin it out you lost roughly 6 pounds couldtn you weld the flap shut?

97' Cummins 2500 Gauges from glowshift (EGT, boost) Fuel pressure gauge from auto-meter. Stage 2 airbox, boost elbow, barrels & plungers turned.Custom fuel plate,Airdog 150gph.AFC mods & 3K GSK.SDX injectors (stage 3 140hp).Drilled wastegate.Converted to a NV4500 with a double disc. Being restored from the ground up


01' Cummins 2500 (dads) with a Hotrod pump,100hp injectors, Fass 150, Edge juice with attitude,also plug and power chip,stage 2 ice box,4 1/2 exgaust pipe,HX40

Riding Dirty #60
B.O.M.B Squad #79
Singles Club #260
Special thanks too


http://www.southerndieselx.com/
xtremediesel.com
dieselperformance.com
cptrucks.com
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post #10 of 23 (permalink) Old 12-26-2009, 06:19 PM
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Welding the 'gate shut will render it useless on ALL 6 cylinders.The smaller turbine housing improves spool up and bottom end torque response and smoke. The 'gate allows it to breathe better on the top end, or under load.

The "lost" boost is from reduced back pressure in the turbine housing, which is a VERY good thing. The lower the boost, the better, to some point. Reduced pumping losses. Better engine efficiency and sometimes better mileage. Boost is pressure. Pressure is created by resistance to flow. Too much boost can be a bad thing.

If you could make 500hp on 20psi, vs 40, be usable and burn clean, the better off you are. Boost isn't the answer. Air flow is.

"Some people are educated beyond their intelligence."

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