hows the stock intake manifold? it looks kinda crappy imo.
i think i can make a new one... it looks like i could have totally straight runners to a 3 or 4 inch penulem. if sized right, i dont think it would lose much (if any) torque, and help flow alot better and pull like hell to redline..
.. so my question.. whats all ON the manifold? i havent actually seen it yet.. are the injector bungs on the head or manifold? anything else i shold be aware of? im used to mr2 mani's with just runners and a penulem..
assorted vacuume lines i can rig up.. but im really not comfortable making injector bungs :/
intake mani?
I've seen a few different manifolds out there... rarely do I see production units but I think they are working on it. I saw one that had like a 5" Log plenum with straight runners. I believe they were going to use it on a KA-T application. I think the same unit had provisions for a secondary fuel system. Shoot, if our cars were as popular as friggin Civics we'd have a mountain to choose from.... oh well.
-
96_S14_SE
- Posts: 973
- Joined: Wed Nov 06, 2002 11:10 am
- Car: 96 S14 SE - 05 VW GTI 1.8t - 89 S13 coupe "gold on brown"
yup they are on the manifold and also the water outlet is cast into it as well.
Common thing to do is take a spare mani and lob off the runners, at the desired lemgth. Port and pollish those and weld them up to a 4" od pipe and then, well you know all the rest.
Jay / psi240 had one on his old ka-t, and was going to use the 80mm vh45 TB but just kept the ka one instread.
Common thing to do is take a spare mani and lob off the runners, at the desired lemgth. Port and pollish those and weld them up to a 4" od pipe and then, well you know all the rest.
Jay / psi240 had one on his old ka-t, and was going to use the 80mm vh45 TB but just kept the ka one instread.
-
96_S14_SE
- Posts: 973
- Joined: Wed Nov 06, 2002 11:10 am
- Car: 96 S14 SE - 05 VW GTI 1.8t - 89 S13 coupe "gold on brown"
Yeah its AL, and welcome to the newb to AL welding class.
I am going to try to mig one up one day. I have the mig, AL cable and wire, but am lacking the Argon tank (I only weld steel thus far so I have a co2-argon tank but dont want to swap it for a rare occasionly used argon only tank, so ill buy another), and lack any aluminum skills.
I will however use all the aluminum stock i have, and get some more cheap surplus stock to learn on, prior to buying a secondary manifold, and the proper plenum stock. I was also going to add velocity stacks between the runners and plenum but I dont know if Ill do that as I cant source any aluminum ones yet. I guess I could try to massage the runner ends into stacks by adding and grinding but who knows.
I am going to try to mig one up one day. I have the mig, AL cable and wire, but am lacking the Argon tank (I only weld steel thus far so I have a co2-argon tank but dont want to swap it for a rare occasionly used argon only tank, so ill buy another), and lack any aluminum skills.
I will however use all the aluminum stock i have, and get some more cheap surplus stock to learn on, prior to buying a secondary manifold, and the proper plenum stock. I was also going to add velocity stacks between the runners and plenum but I dont know if Ill do that as I cant source any aluminum ones yet. I guess I could try to massage the runner ends into stacks by adding and grinding but who knows.
-
nismofan14
- Posts: 579
- Joined: Fri Nov 22, 2002 5:55 am
-
96_S14_SE
- Posts: 973
- Joined: Wed Nov 06, 2002 11:10 am
- Car: 96 S14 SE - 05 VW GTI 1.8t - 89 S13 coupe "gold on brown"
I really not too sure about torque loss on a SM intake manifold. I would imagine one would have to play with the numbers on tb size, plenum volume, and runner length to get the results they need. The best part about SM manifolds is the ease in which they are made (vs cast units), and multiple r&d units not costing a whole hell of a lot.
One thing Ive heard causing problems though is too large of a tb... It could possibly cause off the line lag, IIRC.
So let me toss this out there. My best friend has about 5 vg30detts, and eventually we will make a SM manifold for one of his engines utillizing a single 80mm vh45 TB. While looking at a spare mani just sitting around I thought to my self, why not use twin 53mm (iirc) TBs out of the VG and add one for each set of 2 runners....
I was thinking of cutting the oem runners 2" shorter then I normally would. I would then add aluminum tube to bring them together with a nice smooth divider between the two. From that I would then increase the diameter so that its equal to that of the TB. So at this point Ill have a dual TB setup. Of course Ill have to modify and shorten the center bar between the two TBs.
Then I was thinking I could weld another mounting flange onto the inlets of each TB so that I could mount a single plenum onto the two... Then at the intake of the plenum Ill reduce it slightly so that i can bolt whatever piping I have at the time to it. I suppose it would make chaging out diff volume plenums to see what works best pretty simple. I need to read more into the whole issue of this, but if different plenums offered different results swapping them out for what I need would be a snap.
Only other Idea I have Is a standard 4 runner into 1 plenum design. But at the intake of the plenum mount the dual vg TB's. Looking at the linkage design of the vg TB it would be easy to set one up to open slightly while the other remains closed, or progressively.. This would allow a large amount of air in durring WOT (possibly more then the vh?), but about stock flow under very light accel, like in a school zone, or imediately off the line, as only one would be open slightly....
Ahhh one day Ill figure something out...
One thing Ive heard causing problems though is too large of a tb... It could possibly cause off the line lag, IIRC.
So let me toss this out there. My best friend has about 5 vg30detts, and eventually we will make a SM manifold for one of his engines utillizing a single 80mm vh45 TB. While looking at a spare mani just sitting around I thought to my self, why not use twin 53mm (iirc) TBs out of the VG and add one for each set of 2 runners....
I was thinking of cutting the oem runners 2" shorter then I normally would. I would then add aluminum tube to bring them together with a nice smooth divider between the two. From that I would then increase the diameter so that its equal to that of the TB. So at this point Ill have a dual TB setup. Of course Ill have to modify and shorten the center bar between the two TBs.
Then I was thinking I could weld another mounting flange onto the inlets of each TB so that I could mount a single plenum onto the two... Then at the intake of the plenum Ill reduce it slightly so that i can bolt whatever piping I have at the time to it. I suppose it would make chaging out diff volume plenums to see what works best pretty simple. I need to read more into the whole issue of this, but if different plenums offered different results swapping them out for what I need would be a snap.
Only other Idea I have Is a standard 4 runner into 1 plenum design. But at the intake of the plenum mount the dual vg TB's. Looking at the linkage design of the vg TB it would be easy to set one up to open slightly while the other remains closed, or progressively.. This would allow a large amount of air in durring WOT (possibly more then the vh?), but about stock flow under very light accel, like in a school zone, or imediately off the line, as only one would be open slightly....
Ahhh one day Ill figure something out...
-
96_S14_SE
- Posts: 973
- Joined: Wed Nov 06, 2002 11:10 am
- Car: 96 S14 SE - 05 VW GTI 1.8t - 89 S13 coupe "gold on brown"
Bah the 30 min edit feauture sucks...
The single tb per set of runners may not be all that great... I would probably have to add some sort of ballance tube post tb and mount the various vaccume lines and iacv to that, as I want it to remain streetable... Could be a huge cluster-f*** and possibly not worth it, but I suppose it couldnt hurt to still see after I do some reasearch...
The single tb per set of runners may not be all that great... I would probably have to add some sort of ballance tube post tb and mount the various vaccume lines and iacv to that, as I want it to remain streetable... Could be a huge cluster-f*** and possibly not worth it, but I suppose it couldnt hurt to still see after I do some reasearch...