Engine/Transmission (1998.5 - 2002) hx35 installed dude where's the boost

[MSalvatore]

Hi all I just swapped out the hy9 for a hx35 went for a ride and boost takes a little longer to come up and won't go past 30psi I had it at 34 psi w. hy9 i checked and no leaks ?



marc

 

[Turbo Tim 1]

Do you have a boost fooler in the waste gate actuation line, you should be able to get 35-38 psi out of her no problem.

 

[Oil Burner]

Its normal for the boost to take longer. You'll lose some spool up going to the larger housing on the hx35. but you'll gain flow on the top end.

 

[MSalvatore]

I just pulled elbow off and it is a boost fooler elbow real tiny hole maby I am loosing some pressure from the rubber hose that goes to the wastegate it is barely on the barbs. Where can I get a new hose can I use fuel inhection hose?



Thank's, Marc

 

[Bob Wagner]

they leaking wastegate hose would make the pressure higher not lower.

 

[AKAMAC]

Add some injectors! You will see more boost... ...

 

[MSalvatore]

and my trans all over the street.



marc

 

[Cooker]

It is normal when switching to a larger charger than you will lose some peak boost.

 

[johncameron]

How are your EGT's. If they are below 1350F it doesn't matter how much boost you have. Too much air is just a waste of heat and head gaskets!

 

[MACHINEST]

With a DD UFM you can take the hose plum off,but with a bigger exhaust housing you will see less boost... . If you trany is stock,some injectors will make it short lived,i'm sure.

 

[DieselMinded]

Great upgrade , Your not looking for Boost #'s you increased the Mass of cool air in the motor thats where you get your power from not high boost numbers . . the HY35 and the HX35 have the exact same efficency range,,,,,,, about 23 PSI is their prime ,much over that is all drive pressure which heats the air up also ... NO GOOD ... .



You may see the decrease in boost #'s but ignore the gauge for a ride and notice the real diffrence it has made.



DM

 

[Devan Manis]

How are your EGT's. If they are below 1350F it doesn't matter how much boost you have. Too much air is just a waste of heat and head gaskets!

how does too much air harm a head gasket?

 

[Steve Campbell]

how does too much air harm a head gasket?

Way back when HVAC was starting to bomb his 24 valve, he had to "O-ring" the head gasket on his truck because the extra boost from the extra fueling was causing enough pressure to cause head gasket failure. I do not know if he was the first to do so... . but it was the first time I read about it (late 1999 or early 2000).

 

[NIsaacs]

how does too much air harm a head gasket?

It's not high boost that harms the head gasket, it's the higher effective compression ratio that does the trick. Fuel pump timing plays a part in this also.





"NICK"

 

[johncameron]

how does too much air harm a head gasket?

Some unluckey TDR members have blown a head gasket with just over 40LBS of boost. Others seem to be able to run 50LBS+ without any problems. Don't forget the HO engine has a higher compression ratio so higher boost puts more strass on the head than on the SO version.



I try to keep my boost under 35 for extended periods of time.



JC

 

[Mad Bomber]

Some unluckey TDR members have blown a head gasket with just over 40LBS of boost. Others seem to be able to run 50LBS+ without any problems. Don't forget the HO engine has a higher compression ratio so higher boost puts more strass on the head than on the SO version.



I try to keep my boost under 35 for extended periods of time.



JC

Also before you hit higher boost #'s have the engine fully warmed up.

 

[Cooker]

Some unluckey TDR members have blown a head gasket with just over 40LBS of boost. Others seem to be able to run 50LBS+ without any problems.

As Nick said it is not boost, but drive pressure that can cause more harm on the HG.



Edit: This is true especially with stock chargers and a good majority of single performance chargers.



However, when talking about an efficient good sized single or twins, it is boost that will take out a HG.

 

[Devan Manis]

so we were talking about boost? i was under the impression that he meant that too much air, not boost. see what i am saying? I do know that too much boost, heat, timing and higher effective cylinder pressures blow head gaskets.

 

[Mad Bomber]

so we were talking about boost? i was under the impression that he meant that too much air, not boost. see what i am saying? I do know that too much boost, heat, timing and higher effective cylinder pressures blow head gaskets.

Small chargers can run up to 3 times the boost in back pressure and pop the HG. :{

 

[Devan Manis]

so we were talking about pressures and not AIR? thats what i was trying to get at, the guy said to much air, not pressure. just trying to sort things out not trying to flame you in any way.