HE351 retrofit to second gen - Page 91 - Dodge Cummins Diesel Forum
98.5-02 Performance Parts Discussion Discussion of Performance Parts For the 98-02 Trucks No Advertising ...NO ADVERTISING

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post #1081 of 1091 (permalink) Old 06-09-2016, 06:11 AM
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Quote:
Originally Posted by jkidd View Post
If EGT is where you want it I would not worry about boost.

Nice to have a truck that spools fast...
yeah. appreciate all your help through the years.


he351cw, Hot unlock Edge Juice w/attitude , K@N, 100hp D.A.P.BD 150lift pump, Magnaflow 4" Firepunk street track 47re, Nitto Trail Grapplers 295/70/r17s on alloys
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post #1082 of 1091 (permalink) Old 06-11-2016, 11:11 AM
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Im still having issues with building boost. I just swapped my spring out for one that is very very stiff. And did a boost leak test. Pressurized the system to 15psi and found no leakes while using soap and water. It spools to about 32 psi max. Boost is there quick but feels like it falls off up top. I could peg 35-38 with the hx no problem. My sig is up to date. Not sure what else i can do. Maybe this 351 is on its way out. Has normal side to side and no in and out play.

02 QCLB 6spd 4x4 295/70/17s Trail Grapplers
Valair DD He351cw Tst Smarty DFI 7x.009
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post #1083 of 1091 (permalink) Old 06-11-2016, 12:17 PM
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Quote:
Originally Posted by MassRattleWagon View Post
Im still having issues with building boost. I just swapped my spring out for one that is very very stiff. And did a boost leak test. Pressurized the system to 15psi and found no leakes while using soap and water. It spools to about 32 psi max. Boost is there quick but feels like it falls off up top. I could peg 35-38 with the hx no problem. My sig is up to date. Not sure what else i can do. Maybe this 351 is on its way out. Has normal side to side and no in and out play.
So did you fill that hole i posted about? If you didn't you will not see that in a boost leak test but it will show up when it is running and trying to build boost.

1999 2500 QCLB 4x4, DAP 7x.011 injectors, built 47re, Phat shaft 62/80 over S475 T-6 1.32 A/R, colt stage 3 cam, Quadzilla Adrenaline, Isspro gauges, 285/75-16
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Huh I think I'd quote myself just to be a pretentious prick
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post #1084 of 1091 (permalink) Old 07-28-2016, 01:54 PM
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Quote:
Originally Posted by MassRattleWagon View Post
Im still having issues with building boost. I just swapped my spring out for one that is very very stiff. And did a boost leak test. Pressurized the system to 15psi and found no leakes while using soap and water. It spools to about 32 psi max. Boost is there quick but feels like it falls off up top. I could peg 35-38 with the hx no problem. My sig is up to date. Not sure what else i can do. Maybe this 351 is on its way out. Has normal side to side and no in and out play.
It could also be a head gasket issue. I'm fairly certain that's what my problem was. With my old HX35 it would build up to 40lbs easy, a couple times hitting 45. Put on the 351 and would be lucky to hit 40 lbs. It always felt like it fell off after about 30 lbs, even though the boost kept rising. After I added the s475 into the mix (I'm stupid like that), I could get boost up to 70psi, but it still felt like it fell off after about 50.

I planned on pulling the motor one night, and when I parked it there was oil coming out of the coolant reservoir. When I pulled the head off, there was oil between the gallery holes and the cylinders. My guess is that it had a slow leak for a long time and the additional 30 lbs of boost just helped finish it off.

Anyway, I hate to throw that out, but I had the same symptoms: hard to get higher boost, truck felt like it would fall off even though boost would rise higher.

I didn't see head studs in your sig, so I figured I would at least mention it.

Frank- 2001 12 Valve, HE351CW/S475 compounds, 4k GSK, 60# springs, TST spring kit, fuel plate MIA, tuned AFC, 5x.014 DFI Injectors, 191 DVs, 5inch exhaust, FTE resonator/muffler, 3.55 gears, NV4500 with Valair Ceramic DD
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post #1085 of 1091 (permalink) Old 08-04-2016, 06:23 AM
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Sorry for the late response been away for a while. Trucks running good now. Swapped to a stronger spring and she builds boost quick and spikes at 42psi.

Also pulled a 10k camper loaded, on some long hills and it ran great. Egs ran no higher than 1100 at 55-60mph uphill. Thanks for the help guys!


02 QCLB 6spd 4x4 295/70/17s Trail Grapplers
Valair DD He351cw Tst Smarty DFI 7x.009
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post #1086 of 1091 (permalink) Old 08-25-2016, 03:23 PM
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Anyone sell a kit to make this conversion easier?

2010 BMW M5, Active Autowerke Exhaust
2003 Z06 aka "No Mercy" 427 CID sleeved LS3, BIG CAM, Ported LS7 heads, LG long tubes, High flow cats, 612 RWHP, DTE stage 5 diff, Textralia OZ700 Z ,2 IDQ8's, Zapco Amps, Helix Comps
2001 Dodge Ram 2500 Cummins Auto, QUAD V2, 31" FTE Resonator, gen 4 bumper, FASS 150, DS5, DAP 7x0.010 SAC not installed (waiting for he351 to be installed first), Clarion NX702, 2 Image Dynamic IDQ8's, Helix P62C comps, JL Amps.
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post #1087 of 1091 (permalink) Old 08-25-2016, 09:33 PM
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Quote:
Originally Posted by NoMercy Z06 View Post
Anyone sell a kit to make this conversion easier?
jkidd at DAP has everything needed to do swap

he351cw, Hot unlock Edge Juice w/attitude , K@N, 100hp D.A.P.BD 150lift pump, Magnaflow 4" Firepunk street track 47re, Nitto Trail Grapplers 295/70/r17s on alloys
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post #1088 of 1091 (permalink) Old 02-04-2017, 11:27 AM
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Just wanted to update from my 2013 post on this mod. (post 808)

I ended up going with RV275's and could not be happier. Temps are very easy to control, even up in the mountains, truck responds great, tows great, very little smoke, all in all - very happy with this mod.

No issues with the upgrade or any of the parts I used.

2004.5 Cummins HO QCSB 4X4 SLT, TST PMCR, BDDL, HTB2 62/14, Goerend Full Billet Trans/TC/VB, FASS 95, Amsoil 4090, Magnaflow SS, Smittybuilt Bars, Westin Grille Guard, Di-Pricol Optix Gauges, Tuff Country 4.5" Lift, Eagle rims, 35/12.5/18 Toyo MT's, Bushwacker Flares
2001 Cummins SO QCSB 4x4 Laramie, Edge Juice w/Att, HE351cw, Airdog, Amsoil 4095, 4" Magnaflow SS.
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post #1089 of 1091 (permalink) Old 02-10-2017, 03:59 AM
Too much power? Never.
 
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Sent from my SAMSUNG-SM-N915A using Tapatalk

2010 BMW M5, Active Autowerke Exhaust
2003 Z06 aka "No Mercy" 427 CID sleeved LS3, BIG CAM, Ported LS7 heads, LG long tubes, High flow cats, 612 RWHP, DTE stage 5 diff, Textralia OZ700 Z ,2 IDQ8's, Zapco Amps, Helix Comps
2001 Dodge Ram 2500 Cummins Auto, QUAD V2, 31" FTE Resonator, gen 4 bumper, FASS 150, DS5, DAP 7x0.010 SAC not installed (waiting for he351 to be installed first), Clarion NX702, 2 Image Dynamic IDQ8's, Helix P62C comps, JL Amps.
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post #1090 of 1091 (permalink) Old 03-28-2017, 02:23 PM
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I just picked up my own he351cw and may soon start my own swap.
I've already got a stock 3rd gen exhaust that I can hybridize to my mbrp 4" dp. I have lots of silicone, tbolts and aluminum piping from various turbo supras I've built.

One thing I'm going to do is clock the compressor because having pipes snake around tubes is terrible for intake access and I just don't want that many bends on the charge pipe.

That said, I'm going to end up water jetting a 1/4" thick flange that I can use as a new stock wg mount. And since the solenoid port can accept a standard drain plug bolt, I'm going to use the bolt to hold down the new wg flange. Clocking the compressor will let this point align with the wg flapper arm perfectly.

From here, I have a few options with the bleed holes in the solenoid port: leave them open and take advantage of the boost signal bleed port to fool the stock 20psi actuator and allow me to build MORE than 18-20psi (which a lot of people seem to Not be realizing this is the true reason for this hole and blocking it because it's a "leak"). Or, block it off, and pass thru the true boost signal to the external nipple. From there, I can install an electronic boost controller (which I happen to have laying around, which can do boost by gear or boost by rpm or one fixed boost setting, adjustable from the driver seat. It also has boost response adjustability as well); or install a manually adjustable ball-and-spring boost controller.

As far as the wastegate modification, I'm tempted to take it one step farther than the 25-cent piece size check. Depending on the margin around the hole, I can find an intake or exhaust valve from another car like an ls1, cut the stem off, turn it down to fit in the wg flapper arm, and peen over the end to secure it loosely. Then plunge a mill cutter into the wg hole and open it up more, like 28mm-30mm if possible.

My truck itself has the dap150vco full Bosch bodies, but I don't have a tuner or boost fooler at all. I can't seem to find a solid answer on WHEN I will set the overboost code?

And I love all the info everyone is sharing. Lots of great details guys!

truck #5
2001.5 3500 Laramie, qclb, 4wd, drw auto, goose, AirRaid
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post #1091 of 1091 (permalink) Old 03-28-2017, 05:59 PM
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I picked up this turbo that came off a RV, the wastegate is mounted on a bracket to the turbine housing like a HX35 and the compressor housing discharge mounts to the factory elbow also like a hx35. It's from a 04 300hp ISB, now I have to see if it's the 341 or 351 version, it should mount just like a stock second gen charger.
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