Sheet Metal Intake

[Josh Royle]

What are you thinking of going for Daniel?

[daniel Dee]

Large Plenum and long runners.... JM Fabrications Drag  6"      4800cc + 1/4 heat barrier gasket
Ended up with this 2nd fuel rail..




No results yet as setup has to been tuned.

 

[Jesse Veitch]

Will a tubular exhaust mani build boost faster than a well designed cast mani like the FP? The fact that the FP can place the turbo closer to the exhaust valves than a tubular must help I would think?

[Ivan Skare]

it would be almost the same but the tubular one would have the edge

Will a tubular exhaust mani build boost faster than a well designed cast mani like the FP? The fact that the FP can place the turbo closer to the exhaust valves than a tubular must help I would think?

[Mike Meron]

on a side not marco (of magnus) and I both debated the new style with velocity stacks, pay particular attention to the velostacks and thier placment from the plenum wall. i argued by nature that the turbulance of adding such nice trumpet bells so far away from the wall would cause a turbulance bufferzone, reducing the seen intake volume as well as effecting the flow rate across the 4 ports. a false wall of turbulance or deadspace.
he asked me what i would do and with a flick of some switches and a few hours on the mill. i came up with a one piece plenum wall with built in velo stacks and trumpets. although I have 2 of the manifolds, neither is a production piece for a dsm. I did save the program and if you called and asked for the plenum wall i have im sure they would make them for a fee.
CURRENT VELOSTACK DESIGN

MM Motorsports redesign velostack design

 on a side not my 1g intake built like this will be for sale shortly. it will be more than reasonable and has never been installed. MR ROZON? u likey?

[Kristopher Rozon]

That looks pretty sweet, Mike.
Is this the same mani I was checking out at your place?

I think the protruding stacks act to lengthen the runners in order to gain back some torque, but they may kill the overall plenum size at higher pressures resulting in less flow (stagnation area under the ports). There's a lot going on inside the manifold at any flow - acoustics, helmholtz, valve events...etc - and provided those don't pose any problems over the original design you've created a manifold that could potentially flow a lot more.

I'm aware of other intake manifolds on various applications that use the embedded velostack design. Cars with big turbos should be pretty interested I'd think.

[Marke Bailey]

I have a JMF street intake and the bells are up against the plenum the same as yours, Mike. Also on a side note, after my second trip to the dyno I found no difference between the stock mani and the SMIM. same power and same torque.

[Mike Meron]

ide like to see the graphs of the curves before after,in particular the peak hold time for power and torque through the upper rev band. not for the faint of heart but in particular the range from 6-8krpm. as most of the proven performance increases are based on balanced race built engines designed to rev up there too.

[Marke Bailey]

this graph is with the SMIM



this graph is with the stock manifold



both pulls are with only 20 psi. the differences are the additional mods on the second one. restalled converter, 2nd meth nozzle, no tuning of the cam gears. ignition was breaking up on the second one too. thus why I was limited to 20psi. only 15hp difference, will be more conclusive after I fix my issues and get back on the dyno for total optimization.

[Mike Meron]

as i said to vlad before he dyno'ed change your plugs and wires.
it has since fixed his problems. ngk wires are good for 6 months max and even less than that in summer.
but have a lifetime limited warranty.
keep your recipt kids.

not much of a difference but then again a tune is key, lets hear what lowell thinks on the topic? he has expirience with all forms
of intakes. Hell i bought a 1g extrude honed intake off him in 2003.

[Kristopher Rozon]

Marke it's too bad the two graphs weren't on the same scale...I'm too lazy to look harder.
I'd imagine as with any SMIM the gains are to be up top at higher flows. If you can make the same power down low then that's a great intake IMHO. And if your turbo flows more than 60lb/min and/or you like revving over 7000 then a SMIM should at least be considered.

[daniel Dee]

Initial results on the JMF drag are:
no lost in spool
the torque/Horsepower drop off  (-115lbs torque) beyond 6400 is gone...
Motor now pulls beyond 7500 and is good til 8000 rpm ( limits of this test).
This was a initial tune for the staged injectors ,,,,
The test was halted when the oil pump started squealing and leaking...(470-480 AWHP)

Waiting for a new Mitsubishi oil pump, should be running next weekend.
Update::
Blown HG and bent exhaust valves.. Amazing it could make power with these issues.

[John Hartman]

F(*&^% monster!!  Geter done Dan.