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Old 01-14-2013, 04:43 AM
SSSimon SSSimon is offline
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How much boost will pop a head gasket?

Lots of the common mods on my engine, but stock HPOP and injectors.

Pulling up Clyde Mtn yesterday I was getting over 29 psi of boost from the stock turbo with stock compressor wheel.

Next mod is going to the new Gen 2 WW which could increase the boost to as high as 43 psi.

Should I be worried about blowing a head gasket at that boost level?

I sort of thought I'd be safe with the stock HPOP & sticks...
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MODS: Hutch,ICboots,plenum inserts,IH uppies,G2WW,HPx,AIH delete,EBPV delete,hi flow outlet,CCV mod,OCR,Zoodad,6637,4" TB exhaust,JW VB,coolant filter,FRx,'05 HD lights with switch bypass relays,B20 ready fuel system(3 filters).Stratos truck seats,rear head rests,LED running lights, 285-75-16s. Gauges:EGTx2,Boost,Trans temp,Fuel pressure,Eng oil temp, Coolant temp, Edge CS, PHP tuner
NOT done: big oil, big brakes, big turbo. Next Mods? None - I'm done!
Australia: where Mechanics use spanners & Plumbers use wrenches
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  #2  
Old 01-14-2013, 05:21 AM
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ChunderDownUnder ChunderDownUnder is offline
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Boost is boost, whether you have big sticks or not. What I would be more concerned about is back pressure until you get ya wheel. The main advantage of the wheel is back pressure is kept in check on the stock turbo. In regards to HG's or studs - when you up or above 40psi.
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03 F250 XLT LB . Full Engine build with all the goodies.
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Old 01-15-2013, 04:26 AM
SSSimon SSSimon is offline
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I know my turbo is getting 'surge' at high (for stock) boost - I can hear the fluttering/pulsating noise - it sounds a bit like a cheap ricer blow-off valve - but continuous pulsing.

The G2 WW should solve that problem - the explanation I saw was that the surge is a cavitation issue on the inlet side wheel rather than back pressure affecting the exhaust side of the turbo.

Anyway, the shiny new G2WW arrived today. Out of respect for Diesel Site no pics or comments until I've run it past them.
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MODS: Hutch,ICboots,plenum inserts,IH uppies,G2WW,HPx,AIH delete,EBPV delete,hi flow outlet,CCV mod,OCR,Zoodad,6637,4" TB exhaust,JW VB,coolant filter,FRx,'05 HD lights with switch bypass relays,B20 ready fuel system(3 filters).Stratos truck seats,rear head rests,LED running lights, 285-75-16s. Gauges:EGTx2,Boost,Trans temp,Fuel pressure,Eng oil temp, Coolant temp, Edge CS, PHP tuner
NOT done: big oil, big brakes, big turbo. Next Mods? None - I'm done!
Australia: where Mechanics use spanners & Plumbers use wrenches
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Old 01-16-2013, 12:38 AM
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ChunderDownUnder ChunderDownUnder is offline
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You are right in relation to the surge. But you should realise that BP will cause more damage to your engine, than surge in relation to your turbo. Pushin 30psi out of a stock blower will give you BP. The cool thing about that wheel is you can get 40psi out of it with out increasing turbine speed and the all important BP is kept well in check for that kind of PSI.
SOOOO for little expense you get ya surge sorted, you can achieve 40psi out of a GTP38 and you win on BP.
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Brian
03 F250 XLT LB . Full Engine build with all the goodies.
- cant wait until my motor blows so I can blame someone else -
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Old 01-16-2013, 03:22 AM
SSSimon SSSimon is offline
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OK, is there any tell tale signs that I should be watching out for regarding engine-threatening levels of BP?

I was sort of figuring that I had any BP issues avoided with the 4" TB exhaust I now have and the fact that I will never be pushing anything like 500+ HP out of my set up (hence to qualification of stock HPOP & injectors).

But I would prefer NOT to learn about it the HARD WAY THIS TIME !

40 psi out of a stock blower for a $200 WW upgrade is a lot cheaper that a GTP38 - but not if the result is a BP issue leading to an engine failure !

I have been thinking of the BP as the pressure in the exhast AFTER the tubo. But the engine damaging BP would be pressure in the headers and up-pipes BEFORE the turbo. I can see if this pressure got too great the exhaust gases wouldn't get out of the cylinders quick enough and pressure would build inside the engine and blow a head gasket or worse.

Given the inlet and exhaust turbines are running at the same speed, is the exhast BP BEFORE the turbo roughly the same as the boost pressure?

If the Gen2 WW will achieve 43 psi then maybe I NEED to be getting the HD headstuds now!
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MODS: Hutch,ICboots,plenum inserts,IH uppies,G2WW,HPx,AIH delete,EBPV delete,hi flow outlet,CCV mod,OCR,Zoodad,6637,4" TB exhaust,JW VB,coolant filter,FRx,'05 HD lights with switch bypass relays,B20 ready fuel system(3 filters).Stratos truck seats,rear head rests,LED running lights, 285-75-16s. Gauges:EGTx2,Boost,Trans temp,Fuel pressure,Eng oil temp, Coolant temp, Edge CS, PHP tuner
NOT done: big oil, big brakes, big turbo. Next Mods? None - I'm done!
Australia: where Mechanics use spanners & Plumbers use wrenches
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Old 01-16-2013, 03:22 AM
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