Magnus Inlet Manifolds
- Thread starter OLDIE
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PREDATORVR4
Member
Pretty sure jmf manifolds flow better pretty sure they tested them on evolutionoz.net
4piknup
master of none
There was a flow bench comparo on here from ages ago. Bazeng was involved, I think a magnus was included.
86psi
Member
I'm using a cpc manifold seems ok but I really don't think you would see much gain until running massive boost
Based on what the cylinder head guy told me when I asked him about aftermarket intake manifolds, there is no real advantage over the stock manifold until you see high rpm and boost. Even then it might only be a marginal increase in power.
JayRome
Blurring the line between 1st to 3rd Gen engines..
Yup... there was only a hand full of manifolds that actually made a noticeable increase in power and torque, but you had to be running massive boost and had a redline close to 10k....ENGINR said:
Stock manifold will give you best of everything (There are a lot of CP9A/CT9A guys running factory intakes and throttle bodies with over 350kw atw). Although a good port job will help even flow out to all 4 cylinders...
Here's the test results.
Note, the JMF and Magnus intakes were tested with throttle bodies and elbows connected, so they could have been the reason for some turbulence at #4 runners. It showed different results for different throttle body assemblies. I've since ditched the crap throttle body and am now using an S90 these days.
The 2 x tables showing airflow cc were performed by 2 x different organisations on opposite sides of the world. So what does this mean? results differ depending on how you test them lol.
At the end of the day all you need to do is make sure whatever intake you use is port-matched to the size of your intake ports in your cylinder head. The slightly larger diameter of the Magnus runners means you can attack the intake ports more of your engine I guess.
I got my Magnus many moons ago when the old saying "bigger is better" hype was alive and well. But in recent years we have seen sotck intake cars making the same power figures as those with aftermarket large sheetmetal units.
Im pumping 28psi into my Magnus and making 330kw atw AWD on 98 pump fuel. Note that's 98 pump, not E85 fuel. That's not too bad at all. But my engine is a GVR4 6-bolt motor with large intake ported head. The oem manifold on mine was the small 8-runner Cyclone design so an intake manifold change for me was inevitable when chasing more flow and top end power at the expense of low end torque.
If I can give 2 cents worth of information, I would advise guys with EVO engines to stick with their OEM intakes!! They have been proven to flow 400kw+ on E85 fuel time and time again so why bother even changing them. Unless of course you're looking for that extra kw and flow for competition use.
Those guys with GVR4 engines, I would recommend ditching the Cyclone intakes and replace them with the Auspec GVR4 single piece intake which didn't have the 8-runner design.
Sheet metal intakes are undoubtedly lighter and with the right R&D can flow better and make more power than OEM intakes. But unless you're throwing big boost into your engine, I wouldn't even bother wasteing your money. Spend that $$ on something else first because a change in intake manifold usually means a change of throttle body and intercooler piping too. Sometimes it will give you headaches because the American LHD intakes sit close to our RHD clutch fluid reservoirs and you need to make a tight elbow straight from the throttle body in most cases.
But Oldie you are looking at fitting it into a Starion RWD setup so that wouldn't be an issue.
Note, the JMF and Magnus intakes were tested with throttle bodies and elbows connected, so they could have been the reason for some turbulence at #4 runners. It showed different results for different throttle body assemblies. I've since ditched the crap throttle body and am now using an S90 these days.
The 2 x tables showing airflow cc were performed by 2 x different organisations on opposite sides of the world. So what does this mean? results differ depending on how you test them lol.
At the end of the day all you need to do is make sure whatever intake you use is port-matched to the size of your intake ports in your cylinder head. The slightly larger diameter of the Magnus runners means you can attack the intake ports more of your engine I guess.
I got my Magnus many moons ago when the old saying "bigger is better" hype was alive and well. But in recent years we have seen sotck intake cars making the same power figures as those with aftermarket large sheetmetal units.
Im pumping 28psi into my Magnus and making 330kw atw AWD on 98 pump fuel. Note that's 98 pump, not E85 fuel. That's not too bad at all. But my engine is a GVR4 6-bolt motor with large intake ported head. The oem manifold on mine was the small 8-runner Cyclone design so an intake manifold change for me was inevitable when chasing more flow and top end power at the expense of low end torque.
If I can give 2 cents worth of information, I would advise guys with EVO engines to stick with their OEM intakes!! They have been proven to flow 400kw+ on E85 fuel time and time again so why bother even changing them. Unless of course you're looking for that extra kw and flow for competition use.
Those guys with GVR4 engines, I would recommend ditching the Cyclone intakes and replace them with the Auspec GVR4 single piece intake which didn't have the 8-runner design.
Sheet metal intakes are undoubtedly lighter and with the right R&D can flow better and make more power than OEM intakes. But unless you're throwing big boost into your engine, I wouldn't even bother wasteing your money. Spend that $$ on something else first because a change in intake manifold usually means a change of throttle body and intercooler piping too. Sometimes it will give you headaches because the American LHD intakes sit close to our RHD clutch fluid reservoirs and you need to make a tight elbow straight from the throttle body in most cases.
But Oldie you are looking at fitting it into a Starion RWD setup so that wouldn't be an issue.
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there is no doubt you can make power on stock intakes, but a good manifold will free up power.
the same applies to exhausts, you can make 400kw with a 3" exhaust, drop a 3.5 or 4" on the same setup and you will pick up 5-10%
the same applies to exhausts, you can make 400kw with a 3" exhaust, drop a 3.5 or 4" on the same setup and you will pick up 5-10%
Cranked
Donating Members
There are so many variables. It's like changing turbo, can make more power at same boost. When I did my setup, I made the same power at 12psi (more actually) than previous setup on 21psi. There was a bit more to it byt u catch my drift.
Unless someone wants to buy all manifolds and test them on a dyno under controlled conditions.... I'll watch.
Unless someone wants to buy all manifolds and test them on a dyno under controlled conditions.... I'll watch.
