where to get custom plenium?
 

i 've been looking ino this for my 88 n/a and wonder what kind of gains i could get from it? is there anyone/place out there that can make this for me?

heres what i want it to look like?

http://www.sdsefi.com/techinta.htm

http://www.rotorworx.com.au/perfor_manifolds.html

I have this on my list of 'to-buys' Rember, thats in $AUS, $US is like 2/3's that depending on the exchange rate

-Jacob

it says 740$ chromed and thats in AUS right? so what do you think i would be not chromed and in US$. thanks for the link

Re: where to get custom plenium?
 

The gains will depend on your setup, but it will definitely work better than the stock intake if it is designed well.

Any of your local welding shops should be able to make it, although a race shop would probably be a better (but more expensive) option because they would have a better idea about matching the various dimensions to your engine's performance. You may like this link:
http://www.grapeaperacing.com/grapea...ehelmholtz.cfm

Just an FYI:

See those injector bungs cut at an angle? This is good, but try to mount them with a cut of 70-75 degrees (so they fire within 15-20 degrees of the runner centerline) if possible.

See those velocity stacks sticking up from the floor of the plenum? This is not so good. While a bell-mouth inlet is good, it will work better if they are flush with the plenum and have a good, smooth, transition.

thanks evil aviator alot. while i was looking at the velocity stacks i thought that it didn't seem right they stuck out that far into the plenum. i'll talk to some shops here in town and see what they say but in a ballpark range how much could this cost?

bump

If you are lucky, you can get a buddy to do it for the price of materials and a case of beer, lol. Otherwise, it will probably be somewhere between $500 and $3,500, depending on the materials, workmanship, and the quality of the design. For example, you could get it made for pretty cheap if it were made out of mild steel that anybody with half a brain cell can weld, and cutting corners like using straight pipes instead of flared pipes (velocity stacks) would reduce the cost. Correspondingly, if it is made out of aluminum, inconel, 321 stainless steel, or some other material that is difficult to weld, and it is designed by an aerospace engineer and assembled by a top fabricator, then you are going to need to shell out some big bucks.

Another option is to have somebody cut your stock intake in half with a bandsaw, clean out all of the obstructions, and then weld it back together. This isn't exactly cheap, either, but it meets certain racing rules that require stock external dimensions on the manifold, and of course the street racers like it due to its "sleeper" design.

hmmm, i'll keep that all in mind. i'm guesing it's going to cost a pretty penny! one more thing, i'm pretty shure i won't be able to keep emisions with this right? so if that is the problem i should just bore out the whole intake manifold, right?

dont know if this is what you are going for, but you can get intakes from me at http://www.kgparts.com/jay-tech.htm

is there any special mods for those setups or is it plug and play?

I'll just throw this out... I spoke to those guys and they actually talked me out of that intake. The 30kW (~40HP) increase that they showed was at nearly 30psi boost. He said the lower boost (under 20) wouldn't see near the increase in top end and that the driveabilty was hampered due to loss of low end.

Not saying it won't work for your application or that there aren't beneficial aftermarket manifold designs out there for a street application. I personally think there are, and will probalby design my own eventually to go with my exhaust manifold... just not a priority right now.

-Chris