100lbs/min M54b30 intake manifold is it possible?

[DKING 528e39]

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Has anyone bin able to achieve an air flow of 80lbs/min on the m54 intake manifold with or without the DISA module?
I head that if you are boosting about 24 psi with this manifold on pump gas without any knock preventative adders like (e85) the manifold is living on edge ready to blow.

[vollosso]

I have on the s50/m50 manifold.

I dont see how fuel effects the strength of the inlet manifold.

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[someguy2800]

The restriction of an intake manifold does not increase with higher boost pressures. Your still moving the same volume of air, its just at a higher density.

[DKING 528e39]

I have on the s50/m50 manifold.

I dont see how fuel effects the strength of the inlet manifold.

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well i was assuming that since e85 is a cheaper race gas it overall keeps cylinder temps down which equal less heat distributed through the engine system ie intake temps. not sure if my logic is right though.

[DKING 528e39]

The restriction of an intake manifold does not increase with higher boost pressures. Your still moving the same volume of air, its just at a higher density.

I was not worried about restriction, it was more so the amount of mass (psi) can a plastic manifold take?
RMS wrote up a build on here for e39 m5 turbo with a compression ratio of i think was 12:1, and the intake manifold kept blowing(i dont remeber the OP stating why that happend).

majority of the bmw guys making HUGE power are using custom welded intake manifolds.

[vollosso]

Nah there are very few people runbing custom ims.


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[someguy2800]

Ah I see what you getting at, the question just isn't really stated in the right way. Mass is a weight of air moving through the motor, boost pressure in pounds per square inch relates to the density and temperature of the air going into motor, but it's not directly related to the air mass moving through the motor on a turbo motor. For instance if you had a motor ingesting say 70 lbs a minute of air at 24 psi of boost and you put bigger cams in the motor, the wastegate will still regulate the boost to 24 psi, but now it may ingest 75 or 80 lbs a minute of air due to it being able to ingest more air per intake stroke.

What your looking at is how much boost pressure the intake can physically hold before it would rupture correct?

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well i was assuming that since e85 is a cheaper race gas it overall keeps cylinder temps down which equal less heat distributed through the engine system ie intake temps. not sure if my logic is right though.

No not really, intake air temps are a function of the boost pressure, efficiency ratio of the turbo at a given pressure ratio and mass flow, and the intercooler efficiency. E85 will cool the charge air as it's entering the cylinder due to its latent heat of vaporization, but that's not really going to affect anything upstream except within a few inches of the injector.

[DKING 528e39]

Ah I see what you getting at, the question just isn't really stated in the right way. Mass is a weight of air moving through the motor, boost pressure in pounds per square inch relates to the density and temperature of the air going into motor, but it's not directly related to the air mass moving through the motor on a turbo motor. For instance if you had a motor ingesting say 70 lbs a minute of air at 24 psi of boost and you put bigger cams in the motor, the wastegate will still regulate the boost to 24 psi, but now it may ingest 75 or 80 lbs a minute of air due to it being able to ingest more air per intake stroke.

What your looking at is how much boost pressure the intake can physically hold before it would rupture correct?

Thank you for clearing that up. and yes that is what i am trying to know; I haven't found a direct answer because no one is like " hey lets measure how much pressure this M54b30 intake manifold can take before it blows" majority has opt for the M50 manifold or S52,

if i remember correctly the best manifold is M50>S52>M54

[PEI330Ci]

Thank you for clearing that up. and yes that is what i am trying to know; I haven't found a direct answer because no one is like " hey lets measure how much pressure this M54b30 intake manifold can take before it blows" majority has opt for the M50 manifold or S52,

if i remember correctly the best manifold is M50>S52>M54

I haven't heard of any manifolds "blowing" that weren't damaged in some way. The plastic is really durable stuff.

Currently, I've run up to 21 PSI without any issues....and I know of someone that pressure tested the manifold in Sweden to 35 PSI in a jig.

You're engine is likely to be the weak point.

As far as the DISA goes.....it has always helped me make more power N/A. Based on this, I haven't done any testing with it on boost, and I just left it to switch over 4200 RPM.

[DKING 528e39]

I haven't heard of any manifolds "blowing" that weren't damaged in some way. The plastic is really durable stuff.

Currently, I've run up to 21 PSI without any issues....and I know of someone that pressure tested the manifold in Sweden to 35 PSI in a jig.

You're engine is likely to be the weak point.

As far as the DISA goes.....it has always helped me make more power N/A. Based on this, I haven't done any testing with it on boost, and I just left it to switch over 4200 RPM.

Thanks someguy2800 and PEI330ci for the info

i did some digging and research as to what could blow the manifold and damage, bad tune, and valve letting go are most likely.

around 35 psi should be more than enough for my target hp/tq. I am fully aware that the engine is the weak point at those psi ranges

Hopefully by next year this time Ill be able to put the "old girl" back together again.