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 1089 (permalink) Old 06-09-2016, 06:11 AM
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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 1089 (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 169k 295/70/17s Trail Grapplers
Valair DD He351cw Tst Smarty DFI 7x.009 Isspro Raptor 150
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post #1083 of 1089 (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 1089 (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 1089 (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 169k 295/70/17s Trail Grapplers
Valair DD He351cw Tst Smarty DFI 7x.009 Isspro Raptor 150
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post #1086 of 1089 (permalink) Old 08-25-2016, 03:23 PM
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Anyone sell a kit to make this conversion easier?

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2003 Z06 aka "No Mercy" 427 CID sleeved LS3, BIG CAM, Ported LS7 heads 612 RWHP
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post #1087 of 1089 (permalink) Old 08-25-2016, 09:33 PM
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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 1089 (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 1089 (permalink) Old 02-10-2017, 03:59 AM
Too much power? Never.
 
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