M50B25TU with HX35W

[Wes1311]

Anyone running the HX35W? I am but I cannot figure out the safe boost level for it, I'm thinking about 8psi max with no new studs or head gasket for now, then later rebuilding with rods, pistons, studs, head gasket, etc. I dug around for a while and only saw a couple dead thread of people using the HX35 but no one ever said much about it except 12psi. Thoughts?

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[e30polak]

Anyone running the HX35W? I am but I cannot figure out the safe boost level for it, I'm thinking about 8psi max with no new studs or head gasket for now, then later rebuilding with rods, pistons, studs, head gasket, etc. I dug around for a while and only saw a couple dead thread of people using the HX35 but no one ever said much about it except 12psi. Thoughts?

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An hx35 can be pushed to 15 psi easily on the 24v motor. What size exhaust housing are you using?

[Wes1311]

An hx35 can be pushed to 15 psi easily on the 24v motor. What size exhaust housing are you using?

Without studs or head gasket? I will need to look again but it, I'm honestly unsure on the exhaust housing size, it is a twinscroll, here are the marking on it

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[e30polak]

sorry, didn't read the full post you originally had. on Stock head gasket and studs about 7-8 psi with good tuning. The turbo is capable of 15 psi easily.

You look to have the 12cm exhaust housing.

[Wes1311]

Awesome, I'm still learning a lot about boosting, this is my first turbo build let alone boosted car at all. After I build the internals, later down the road(yay deployment money!) Could it do 20-24ish psi? I figure it will since it is coming off a 6L Cummins

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[terry baby]

Do studs and a hg and a spacer

[e30polak]

Yes and no, your m50 is WAY more efficient and flows WAY more air then that Cummins. That turbo will start to become very inefficient at around 20-22psi. You can make that much boost, but very little power for each extra pound of boost above 15-17 psi.

[Wes1311]

Yes and no, your m50 is WAY more efficient and flows WAY more air then that Cummins. That turbo will start to become very inefficient at around 20-22psi. You can make that much boost, but very little power for each extra pound of boost above 15-17 psi.

That makes sense, I was reading about the exhaust gas flow also, how the turbine is setup for volume of gases since diesel exhaust gases flow far slower than gasoline exhaust gases and so on. I was surprised how quickly though this turbo seems to spool up, at about 3500-4000rpm it appears to have full boost but starts boost at very low rpms

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[e30polak]

That makes sense, I was reading about the exhaust gas flow also, how the turbine is setup for volume of gases since diesel exhaust gases flow far slower than gasoline exhaust gases and so on. I was surprised how quickly though this turbo seems to spool up, at about 3500-4000rpm it appears to have full boost but starts boost at very low rpms

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The e30 crowd has used that turbo for years on the 2.5 m20 with great results, and since you have a way more efficient motor, it should yield even better results.