DIY cai?

luigi90210

you could get halfway there and order an ebay SRI(K&N Typhoon knock off) with a proper size maf adapter(2.5in iirc) so all you would need are a way to connect the elbow pieces to the pipes and have the filters in the same location as stillen G3s

synolimit

That's going to increase price no? The stock MAF is free and the pipe I got was $23 shipped. Any links?

__________________
13 370z-

luigi90210

well if you want an effective DIY intake, you will at least need post MAF Tubes to help with flow

with the intake, it costs about the same as HPS tubes with free shipping and including your extensions it will cost you around $150 give or take if you need new piping or not(i dont think you will but there is a chance you might)

plus it will lean things out mechanically so you might make as much as stillen G3s(its 2.75" piping with a 2.5" Maf adapter which is bigger than the stock tube)

Red Shortram Air Intake Kit Infiniti 08 13 G37 07 08 G35 Sedan RAM Cool Dual V6 | eBay


there are cheaper ones on ebay as well, i dont know the intake size but i have seen other knock off intakes go for $90

synolimit

Yeah I'm not messing with larger pipe. $10 says tuning will be a must, that short MAF housings not enough. Plus, now takjak has turned me onto the silicone having less heat idea. The less metal the better. He'll if I could make silicone tubes I would! $100+ is a ******* joke for those tubes!! If I can buy 6 couplings and not go over $40, no way them post tubes should rape your *** like that.

__________________
13 370z-

luigi90210

could you explain why it would need to be tuned?

i believe they are knock offs of either the K&N SRI or the Takeda SRI(im leaning more towards the takeda because of the size and style)

i suggest looking up Modshack's SRI

he already messed with silicone tubes and compared them to post maf tubes, they are basicly the same iirc

kenchan

Use your brain elsewhere. Just buy the post maf tubes and kn drop ins.

synolimit

Not worth it to me.

__________________
13 370z-

synolimit

All done

__________________
13 370z-

takjak2

Pics?

__________________
Mods | Stuff | Things | Seat Time | Nismo
facebook.com/TeamSparrowSpeed

synolimit

First post.

__________________
13 370z-

luigi90210

i might do something like this in the near future if i decide to go with LTI

good write up

__________________
SOLD 370z
New Car:classified
DD:2011 Mini Cooper S stock

synolimit

Thanks

__________________
13 370z-

synolimit

Decided to change out my cai system that uses the OEM MAF section. It's only 2.35" ID which matched the throttle body. Now that my TB is 2.48", I need to have the piping bigger. From the way I understand it, your intake should taper down in size and not up. Tapering down would increase air flow like air going through a compressor on a turbo. I'm going with 2.75" OD pipe or about 2.63" ID. That should have the system bigger than the TB and really help. I bought new MAF housings and they showed up today. Only $40 on ebay. I'm still waiting on the pipe. I'll post pics soon.

__________________
13 370z-

Jordo!

I could be mistaken, but I think narrower inlets are better to maintain part throttle velocity (or the incorporation of a butterfly of some sort), whereas gradual stepping up to wider diameter as you move towards the intake manifold would be ideal for optimal cylinder filling at WOT...

I could be wrong though... worth doing a little additional research on this, but I'm pretty sure that IM and EM runner designs almost always step UP in diameter from flow entry to exit, not down.

If it's unclear, I'd keep the diameter the same, and maybe incorporate velocity stacks at the intake inlets before the MAF's.

Anyway, be prepared to do a lot of rescaling the MAF voltage tables.

Good luck!

__________________
Enjoy it. Destroy it.

synolimit

Stepping up when the TB is the choke point won't do anything I don't think. No need to have a bunch of air stuck in a dam and can't get through. The stillen uses a 3" filter, tapers to 2.5" OD all the way to the TB. You wouldn't want a 2" filter and step up. Nothing will get through a 2" because it's far away from the TB and it will choke out. A velocity stack can be small but that'd be attached to the runner so no pipe equals no choke. It'd suck all the air it could. Like a turbo compressor you want to have a bigger size going to a smaller size to speed up the velocity but ending at the smallest size. The taper rate depends on the length of pipe and the diameter from start to finish. I believe Megan's cai does this. You also wouldn't want to go to small then back up at the TB size. This or just run the smallest part of the system the whole way, again like stillen. But I can't do this because aluminium pipe doesn't come in a 2.48" ID size. So better to run 2.63" all the way through till it's forced down into the 2.48" TB. It's still going to act like a dam because the taper will happen in 2.5 inches but better than nothing. All I know is I don't want the MAF section I have now because it's the smallest part at only 2.35" ID.

__________________
13 370z-