Yeah, I intended to make better images and upload them to a reputable host, but surprise family visit was a surprise and nothing tib-wise was done this weekend.

As soon as I can I'll get the volume measurements up along with better images.

 

I had my intake manifold plenum hacked off and a box put on in its place, I have no dyno sheets to go on but will agree with you that the factory casting is terrible and even a good porting job wouldnt be enough.

 

If recollection serves you were running really short runners as well. How has performance changed for you? And what kind of collection are you using inside the plenum?

 

Yes my runners are about 2.5" long, I dont have any velocity stacks inside the plenum however each runner has a nice smooth transition slope out of the box plenum. Performance wise I have not noticed a decrease in performance even while not boosting.

 

How would that compere with the AIRRAM ?

 

Well I doubt you'd see much of a loss in performance but probably a really early power band. 2.5 is REALLY small but under boost with a decent plenum you might have offset it somewhat. What diameter are the runners on the plenum side and is it tapered at all?



Not sure how any of this compares to the airram. The Air ram used longer, equal length runners so it a probably much smoother but would have cause longer spool time on boosted apps. It did have a nicer wedge shape for graduated air delivery, not to mention BBTB. But most importantly the in plenum air direction was far superior. (images courtesy of this thread)

Stock:





AIRRAM:







I do know that when it comes to plenum design, a large intake and sloping canopy are preferred. However unlike the AIRRAM some kind of belled intake is generally seen as performed for flow purposes. I think most people are just hung up on the idea of the AIRRAM because its so illusive and about the only after market option.

 

Just seeing those pictures makes me want an airram.

 

Troll mode on: I have one

 

Good luck finding one. When they were made a very limited number were actually produced/sold. So when they come available today they command pretty steep prices that probably don't make it worthwhile for meager gains. Hence the thread! Once all of the math is done I'm taking the spare IM to my fab guy and going to try to make something even better.



Plus I have a bunch of kevlar in my basement (long story) and some CF to make a really strong smooth plenum. My goal is to wind up with a nicer, better performing product based off real R&D. (At least as real as my budget will allow.)

 

I hate you..







Sounds awesome. Is this something you're going to do one off for yourself, or is it something you will sell a few of once you're done? Also is it worth changing the IM if you're running N/A?