DIY cai?

synolimit · 08-03-2013, 05:27 PM

Quote:

Originally Posted by 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

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

luigi90210 · 08-03-2013, 07:03 PM

Quote:

Originally Posted by synolimit

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

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 · 08-03-2013, 08:35 PM

Quote:

Originally Posted by 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

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.

luigi90210 · 08-03-2013, 10:47 PM

Quote:

Originally Posted by 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.

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

synolimit · 08-03-2013, 11:51 PM

Quote:

Originally Posted by 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

With such a small width MAF section and so large before and after, I can promise the voltage will drop. A larger tube drops volts so the ecu will think the motors at a smaller flow rate and will add less fuel than whats needed, run lean, it blows up. Typically a MAF section needs to be at least 9" long and nice and straight.

luigi90210 · 08-04-2013, 12:23 AM

Quote:

Originally Posted by synolimit

With such a small width MAF section and so large before and after, I can promise the voltage will drop. A larger tube drops volts so the ecu will think the motors at a smaller flow rate and will add less fuel than whats needed, run lean, it blows up. Typically a MAF section needs to be at least 9" long and nice and straight.

it actually provides more velocity than a straight through pipe would

Quote:

Originally Posted by Modshack

I'll do it eventually. I'm designing more for Under the curve driveability than I am for a few HP at RPM's I rarely spend time at.

Hard to say. It looks like they squeeze the pipes at the MAf mount area, but to what internal diameter I don't know. Necking down the pipe and then expanding it again does improve velocity (like a venturi) and could provide some leaning and more power depending on the ID. The placement of the MAF inside the tube will have an effect also as air flow through a tube is faster in the center than it is toward the outside. I'd tend to doubt that 20hp number though..

synolimit · 08-04-2013, 09:37 AM

Quote:

Originally Posted by luigi90210

it actually provides more velocity than a straight through pipe would

I'm not in aero so id have no idea unless i saw hard data but the ecu isn't going to be able to compensate that much MAF volts in a rise or fall. Once out of the parameters of the ecu good luck not blowing it up. The car isn't turbo'd so there'd be no reason to go any larger than 2.34" ID. Since I've seen some cars run mid 13's AFR I wouldn't F with that ****. Not unless you're at the tuner tuning at that time. If stillen thought it was a good idea they'd of done it! But since they use 2.34" ID from just after the filter all the way to the TB, I'd say they figured it out.