rebel_horseman

List maybe you can help me with something. The H1C on my truck is (likely) the OE turbo that came on the truck. Right now the ticker is at 180k miles.

Question #1 - how much life can be expected out of a turbo when it's primary purpose is towing a 5th wheel around by someone who has no pyro/boost gauge (previous owner)?

The reason for question #1 relates to the title of the thread. Here's the potential problem. Under acceleration, low boost and moderate pedal pressure such as right after a shift while accelerating up a grade, I occasionally get a "noise." This "noise" is definitely boost related. The sound is similar to a pulsating "woosh" and can be observed by the boost needle fluttering substantially. If I let off the go pedal and then gently get back on it and lightly accelerate until boost and RPMs get up to a more normal range then there is no problem. Also, the problem does not happen every time I drive the truck. Last time I had the intake tube off, there was no visible problems with the shaft and only minimal movement was observed.

What am I hearing and what do you think it's a sign of?

Any advice or insight would be appreciated.

Tacomaman87

not sure on themilage thing but its sounds like you might have some compressor chatter. normally my truck will do it when im on the throttle inder boost then let out of it quick. im sureone of the 1sr genners will chime in on this though.

Richie O

I agree with above. The boost jump when you hear the noise kinda points that way.

CaptainChrysler

Kind of sounds like compressor surge to me. What exhaust housing do you have?

What RPM does it happen at?

rebel_horseman

As far as I know it's the original turbo and I know it's the original manifold. The tach wasn't working the last time i heard it, but my best guess would be that it starts when the RPMs drop from the shift anywhere from 1300 to 1600 and will sustain until it spins up over 2000 if I stay in it. But usually once it starts I immediately back out of it and then try to gently get back in.

G1625S

I'd definitely say compressor surge. even the orginal 18cm housing can surge with a cranked pump, heavy load, low rpms and no map width slots.

PapeCAT

x2 time to get a compressor and housing upgrade at a minimum. Keep surging your turbo like that and you shorten the life of it substantially.

rebel_horseman

That's what I was figuring it was. Since I don't plan on going ridiculous with the power I'll probably go with an upgrade to the H1C rather than a new HX35 or something.

Thanks for the help fellas!

jimbo486

you can find used and in good shape hx-35's all day long for cheaper than what a comp. wheel and housing upgrade would cost you. i've seen a lot go for anywhere from $120 to $200. i'm looking at upgrading to at least an hx-35 rather than just upgrading the h1c's wheel and housing. just my $.02.

Crossy's son

a 60mm compressor upgrade is gonna be better than an hx35 which is the same specs as an I/C H1C except it has the map slots.

Buta 60mm upgrade will push more air and get the map slots to prevent surge. from GDS they're really not that much...

CaptainChrysler

The map will not prevent surge, it just changes the point at which it happens.

Maybe your just shifting too early? Has it always done it?

jimbo486

^^ agreed. the MWE (map width enhacement) slots only help with "barking" giving the compressed air somewhere else to go rather than trying to spin the turbo backwards. and i believe that's what the "silencer ring" (better known as the inlet baffle to direct the air into the compressor wheel) actually blocks in most turbos.