Intake Manifold question

[gobeli67]

I have a stock intake manifold and i was wondering if i could cut the bends out and make it shorter and then reweld it making it so it would be in about the same spot as the stock location. I was goin to try and copy the magnus in the runner length. Mabye make a new plenum to. Would this work or is it a big waste of time. I think it would be worth the effort to build a nice custom intake. Let me know what you all think. I have access to a full machine shop/ fab shop/ any welder you can imagine everyday so I could do it in theory. I just dont want to make it and them have a crap shoot for power.

 

[hopwoodp]

You could do all that but it would not be in the same location. The plenum would be at a different angle as will. I haven't really heard of many people ever doing this before but, if you got someone who knows how to weld aluminum good then go for it. Just remember that you will need to re-fabricate your throttle body elbow and find a place to relocate you coil pack and ignition control module.

 

[gobeli67]

Yea thats what i was thinking would be the problem. Ill get it as close as I can. As far as welding I can weld aluminum in my sleep. Im gonna bring it in tomorrow and and start cuttin it up. I was gonna have to remake the elbow anyway, ### im goin blow through this weekend.

 

[somdturbo]

Let me know how that works out. If anything i would port the hell out of the runners and make a new plenum.

 

[gobeli67]

Ok so today I cut the plenum off and also the flange that goes to the head. I left a little meat on the flange and about 1" on the plenum. Man that was a pain in the butt. I had to use a band saw then a plasma cutter to get the plenum off. So now i just have to do some measuring and then cut my sheetmetal and weld it together. Should be done in a week or two. Ill get up some pics monday.

 

[95blackGsTurbo]

I wouldn't have touched it at all. It was designed like that for a reason. You aren't going to gain anything by shortening the runners but more than likely lose power. Not to mentions have to refab IC piping.

 

[94Jettameowpsst]

There's a lot of math that goes into the size of the runners, plenum etc.... but im sure if you have the runners (if thats all you're going to do) the same length and size if you're going bigger and shorter, you'll probably lose some low end torque but pick up some hp up top.
My 2.0 jetta a while back made 211whp and 240 some odd torque at 12psi and as soon as i switched to a vw motorsport intake mani, i made 230 some whp and about 230 torque...just because the runners are shorter and the plenum is a larger volume.

 

[abillabong2002]

It depends on what you want to get out of your car. A 1g vs 2g intake manifold, the 1g is better...

said by Sean485 on a post ---- As for if it will help you or not it all depends on what your goals are, big cams + big turbo + looking for lots of top end power = Sheet metal intake. If your looking to stick with a Smaller turbo, smaller cams, and more midrange power then the 1g intake would be sufficient.
http://www.dsmtuners.com/forums/showthread.php?t=167857&highlight=intake+manifold+flow+chart

 

[pnishr]

Somebody has done something similar to this and sells them I believe. I've been searching for about 15min. but can't find it. It may be on the dsmlink forums or somewhere else. It's basically a Cast Mani. that keeps most of the lines of the stock, but replaces the Plenum with a large cylinder. Keeps the down-low properties, but increases top end in plenum design. I'll keep looking, but it's out there. Pretty sure the picture of it is embeded in the thread.

 

[Superbeast406]

I love to see people trying new things even when others think its a waste of time. thinking right with shorter runners and higher rpm powerband, but I would try it on a spare manifold. If you think you can do it, then do it.

 

[pnishr]

Just in case you have a DSMLink forum account, below is the thread. Below that is a picture. Some local shop to the guy that posted it (in Canada) makes them. Maybe you can make out the name on the side of the plenum. Edit: oh, the company is "Forcepower" http://www.forcepower.ca/

http://www.dsmlink.com/forums/showthread.php?t=13010&highlight=cast+intake+manifold

 

[gobeli67]

Yea this was just a spare manifold that i had laying around. What I am doing basically is cutting off the plenum and flange for the head and making sheet metal runners that are going to be straight and shorter. Im trying to shoot for more mid to high range power because that where I need all my power.

 

[speedmaster747]

Just in case you have a DSMLink forum account, below is the thread. Below that is a picture. Some local shop to the guy that posted it (in Canada) makes them. Maybe you can make out the name on the side of the plenum. Edit: oh, the company is "Forcepower" http://www.forcepower.ca/

http://www.dsmlink.com/forums/showthread.php?t=13010&highlight=cast+intake+manifold

That manifold looks like this one!

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[CoopsCoupe]

Sorry to open this back up but what about the Stock mani. WOuldn't it support just as well. Even better with low end torque? I have a crap load of supporting mods, (CHECK OUT MY PROFILE) and I am working on the intake. My piping is 2.5 and IC is 2.5. and Im 1mm over sizing my valves. But the diameter and flow is still enough to use the Intake manifold. And Im not shifting high. All these things go into what you really need. I think I may stick with my Stock and spend the money elsewhere. Any input is greatly welcome. Thanks