dont want to pop the head gasket

[rockmike]

Hey guys please forgive my ignorance(Im learning) My truck is running about 35psi@ WFO since I put the W/M on now it wants to over boost a bit if I let it. keep it floored it acts like it will climb to 40psi maybe more Ive read on here that stock head gasket and bolt will not hold up this kinda abuse.I could just run water,I assume this will lower boost since there no methanol(to burn as fuel)?But its freezing outside I need the meth in there for winter work.I could back out the power screw,I dont want to do this,if anything I would like to turn it in a lil more and get some more power out of her.

So I guess the best thing to do would be to lengthin the rod on the waste gate?? I dont have to truck in front of me right now(im at work)Does the hx35 have and adjustable rod? would I need to cut the rod and put a turnbuckle of some sort in there so I could adjust the rod?

Im getting the truck ready for a long haul to Moab,Utah in two months,will be pulling about 18k and I just dont want no issues.I want more power but need to control this boost to no more than 35 psi w/ the W/M

Thanks

[skilletky]

DONT RUN JUST WATER. turn the controller down. i ran mine at 100% and 45 psi of boost 2 times on stock head bolts. blew the gasket both times. i found that withe regular old -20 blue washer fluid, around 40 psi of boost, stock head bolts, and the contoller set to no higher than 70%, it would not blow the head gasket. every truck is differnet

[skilletky]

more timing, plain water, and 40 psi of boost is a little too much cyl pressure for stock bolts

[rockmike]

Thanks for the post,can you help me with the boost control question? as far as lengthing the WG rod to give less boost @ WFO?

Im guessing this is a Mr obvious question

I would like to dial up a lil more fuel with my power screw or a fuel pin,everytime I add a lil more fuel my boost goes up @WFO.I think ideally I would like 30 psi with no W/M @ WFO so when the W/M comes on I'll climb to 35 psi...

[skilletky]

more fuel = more boost. if you lengthen the waste gate rod then it should lower boost, i think, i cant think straight for some reason right now.

[oldestof11]

Hot torque your head bolts to 135lbs and drill out your wastegate to 7/8" I believe.

[rockmike]

Hot torque your head bolts to 135lbs and drill out your wastegate to 7/8" I believe.

I have not retorqued the head? I did adjust the valves,damn the exhaust valves where way out of spec

When I installed the hx35 I drilled the hole out to 13/16" and drilled through the divider.I dont have much experiance with these 12v engines.My truck sure responds well to any fuel...it runs harder and the boost comes up quick! It must be a healthy engine,etc.

I'll take a good look at that WG rod when I get home and see what it takes tomake it adjustable,if its not already adjustable?

Thanks guys ,sure appreciate the help and knowledge y'all bring.

[revemup15]

Hot torque your head bolts to 135lbs and drill out your wastegate to 7/8" I believe.

what a fail . . .. good way to stretch a bolt or stud

[bgilbert]

Hot torque your head bolts to 135lbs and drill out your wastegate to 7/8" I believe.

what a fail... good way to stretch a bolt or stud

Many go to 150ftlbs without a fail..

[RCCUMMINS89]

Added timing is really hard on the hg. Due to the fact you have the spacer, I would try to limit your boost to 35# max. I blew a hg at 30#...due to timing.

Double check the torques on your head bolts... I'm personally not a fan of overtorquing though. But at 200k miles, some of my head bolts were at about 60#...... ya, exactly.

[Sutter1stgen]

I would definitely retorque at least. I pulled each bolt, one at a time, in the torque sequence. Took the bolt to the wire wheel for some cleaning, applied a liberal amount of hd lube, and reinstalled to factory torque spec 90ftlbs I believe????
After every bolt was reinstalled with lube to the factory spec, I would raise the torque in sequence, in encriments till I got to 125ftlbs. I did all of this in the morning with a stone cold engine. The truck was not started within 12 hours.
This worked for me with my pump to the bead and a small set of twins at 55 psi, with high drive pressures. I later put ARP studs in and feel a lot more confident.

[SuperiorRam]

Lengthing the wg rod won't get you anywhere IMO the puck only has so far to open till it hits the back cover

[BC847]

Lengthing the wg rod won't get you anywhere IMO the puck only has so far to open till it hits the back cover

It does affect the preload on the WG spring though, thus altering the pressure required to open/close the gate.

[rockmike]

Can I get a differant spring or WG pod thing to lower boost #'s rather than extending the rod?

Would this be a better way of lowering boost?

This hx35 I have came off an 01 5 speed truck.

[RCCUMMINS89]

You could run an external gate...but they are kind of pricey, around $400 on up.