Tale of two intake manifolds - is bigger better?
Jul 1, 2005, 10:10 AM
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Tale of two intake manifolds - is bigger better?
Here is a comparison of two different intake manifolds on my evo.
The BJ's intake is really nice looking and massive. It has huge runners that are tapered. It also really contributed to turbo lag and killed our low end power.
The Magnus intake seems to really help the low end power, creating mush faster velocity and more snap on the low end.
65 mph is about 5500 rpms and 22.5 psi of boost. Both set ups made the same exact boost level at 5500. As you can see the Magnus is making 63 more whp at that rpm with the same boopst level.
Up top, after 7200 rpms 82 mph - the BJ starts to make a slight advantage in the flow - but IMHO not worth the trade off down low.
Next up, I will be testing a AMS intake and a JUn intake.
Making power and going fast is hard work.
For now I am proud to be running the Magnus intake and I have a new Mangus with improved velocity stacks to also test next week.
The BJ's intake is really nice looking and massive. It has huge runners that are tapered. It also really contributed to turbo lag and killed our low end power.
The Magnus intake seems to really help the low end power, creating mush faster velocity and more snap on the low end.
65 mph is about 5500 rpms and 22.5 psi of boost. Both set ups made the same exact boost level at 5500. As you can see the Magnus is making 63 more whp at that rpm with the same boopst level.
Up top, after 7200 rpms 82 mph - the BJ starts to make a slight advantage in the flow - but IMHO not worth the trade off down low.
Next up, I will be testing a AMS intake and a JUn intake.
Making power and going fast is hard work.
For now I am proud to be running the Magnus intake and I have a new Mangus with improved velocity stacks to also test next week.
Jul 1, 2005, 11:13 AM
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This is great information! 
It'd be nice to see your mods, as this is obviously going to be much different for those people with different setups.
On a side note, it'd be nice to see more of these things on EvoM. Sometimes it seems that the people that have the ability to make these types of comparisons are hesitant to do so, as they don't want to hurt their sales. (This isn't directed at anyone in specific, it's just a general note)
It'd be nice to see your mods, as this is obviously going to be much different for those people with different setups. On a side note, it'd be nice to see more of these things on EvoM. Sometimes it seems that the people that have the ability to make these types of comparisons are hesitant to do so, as they don't want to hurt their sales. (This isn't directed at anyone in specific, it's just a general note)
Jul 1, 2005, 11:25 AM
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I figured this is why you posted the BJ's for sale. Still though it sucks that it costs that much money to see the true results. That is a big difference at that boost level.
Jul 1, 2005, 11:31 AM
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Al, isn't it true that at different power levels one manifold might be more beneficial to you than another? I thought depending on the runner lengths, some are more for higher rpm range (above 8K rpms) and some are better for lower rpm range.
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Jul 1, 2005, 12:02 PM
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Originally Posted by Geo@EvoStore
Good information. Would have been perfect with torque #s and to see the curve.
Can't wait to see the results of more intake testing.
l8r)
Jul 1, 2005, 12:35 PM
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Originally Posted by Full-Race Geoff
could you put up a dyno plot of rpm instead of mph, and add tq to the plot?
Jul 1, 2005, 02:24 PM
#13
one more thing worth considering is to use a good exhaust manifold. I am willing to bet that the power on the BJ manifold would pick up significantly if you used an exh manifold that allowed the motor to exhale too.
the magnus plenum is so small compared to what we have seen work on everything else i feel that the results you are seeing might be due to a high pressure area between the exh valve and turbine wheel. i dont see how the tiny magnus plenum can work so well
the magnus plenum is so small compared to what we have seen work on everything else i feel that the results you are seeing might be due to a high pressure area between the exh valve and turbine wheel. i dont see how the tiny magnus plenum can work so well
Jul 1, 2005, 03:01 PM
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Originally Posted by Full-Race Geoff
one more thing worth considering is to use a good exhaust manifold. I am willing to bet that the power on the BJ manifold would pick up significantly if you used an exh manifold that allowed the motor to exhale too.
the magnus plenum is so small compared to what we have seen work on everything else i feel that the results you are seeing might be due to a high pressure area between the exh valve and turbine wheel. i dont see how the tiny magnus plenum can work so well
the magnus plenum is so small compared to what we have seen work on everything else i feel that the results you are seeing might be due to a high pressure area between the exh valve and turbine wheel. i dont see how the tiny magnus plenum can work so well
Al, please post the mods on the vehicle too.
Jul 1, 2005, 03:04 PM
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JUN products are great, BUT severely overpriced considering there are others out there as good or close to the same performance without the heavy price tag.
$3400 is absolutely rediculous. It doesn't cost anywhere near that amount to make them, but people keep buying them so the price stays the same.
$3400 is absolutely rediculous. It doesn't cost anywhere near that amount to make them, but people keep buying them so the price stays the same.
Originally Posted by Kwman
Can't wait to see the #'s on the JUN mani, see if its worth the 3400 dollar price.