SRI and CAI discussion

46753 Views 146 Replies 40 Participants Last post by valleyracer, Apr 16, 2018

Norrie

Discussion Starter · Apr 16, 2014

I thought I'd pull the discussion about intakes out of Redturbo's build thread. Basically, these will add 5-10hp and increase throttle response. Both give a similar result but the CAI pulls colder air in through a longer pipe and the SRI will draw slightly warmer air but through a shorter pipe. So the pros and cons even out and both are very similar. CAI is supposed to be better for cars without a tune but the SRI is slightly better with a tune. With a CAI you also run the risk of hyrdrolocking your engine because you're drawing air from closer to the road. But this is really only a concern for those who live in areas prone to heavy rain and flooding.

If you test-fit an intake, please add your findings here. Redturbo has test-fitted Turbosocks' SRI which fits but he removed it because it doesn't allow recircualting. I'm guessing the K&N won't fit and will need to be customised for the different engine bay.

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Redturbo

· #2 · Apr 16, 2014

Great idea about the thread @norrie

As you have stated, i have test fitted the TurboSocks intake, which will fit as far as the room in the engine bay. IF you want a CAI, make sure (if you have HIDs) you have room! I am going for a SRI so it isn't a problem for me. But, when i was testing to see if there was room for a CAI for those that would want it, i ran into the problem of my ballasts for my HIDs. There wouldn't be enough room for me to put the CAI with my ballasts where it is. So, if you're wanting a CAI, i would opt for getting the CAI first. If you already have HIDs, check and see where your ballast box is.

I will be ordering an Injen SRI from import shark. It has a recirculation option on it, and i'm assuming it will fit since the turbo socks one fit, just didn't have the recirc i wanted.

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6thElementEngineering

· #3 · Apr 16, 2014

Norrie said:
I thought I'd pull the discussion about intakes out of Redturbo's build thread. Basically, these will add 5-10hp and increase throttle response. Both give a similar result but the CAI pulls colder air in through a longer pipe and the SRI will draw slightly warmer air but through a shorter pipe. So the pros and cons even out and both are very similar. CAI is supposed to be better for cars without a tune but the SRI is slightly better with a tune. With a CAI you also run the risk of hyrdrolocking your engine because you're drawing air from closer to the road. But this is really only a concern for those who live in areas prone to heavy rain and flooding.

If you test-fit an intake, please add your findings here. Redturbo has test-fitted Turbosocks' SRI which fits but he removed it because it doesn't allow recircualting. I'm guessing the K&N won't fit and will need to be customised for the different engine bay.

A tune shouldn't matter for these engines when it comes to an intake. The intake air temperature sensor and MAP sensor are attached to the intake manifold, and that's where all air digestion measurements are taken.
So as long as you get the coldest air you can, it becomes a matter of schematics as to where you can get your air filter (farthest away from the motor to optimize performance.

General rule of thumb: Get the biggest air filter (and best flowing) you possibly can in there while keeping it away from heat as best as you can. You may have to sacrifice heat proximity for air filter size or vice versa.
Since these cars are turbo, and once the air goes through the filter and gets compressed (and therefore heated) byt the turbocharger, we should have a nice intercooler core to bring the air temperature back down to close as ambient temp as possible.

I am going to try to find an OBD-II scanner gauge (something like this UltraGauge OBDII Scan tool & Information Center).
I would use this to take data when making a SRI or CAI by looking at ambient air temp vs intake air temp on this gauge (these engines have both sensors).

Personally, I would most likely be developing a SRI with the biggest, highest flowing filter I can find (AEM Dryflow probably) and developing a good front mount intercooler or better stock replacement intercooler to bring intake temps down as much as possible.

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Redturbo

· #4 · Apr 16, 2014

Min also going to get an OBDII scanner tool. I was talking to people on the veloster forums about it a couple days ago. Fairly cheap too. But the app they use is only available on android. I have IOS. Lol. IOS has a couple apps that do the same thing so I'm thinking about giving it a try.

Redturbo

· #5 · Apr 17, 2014

Not sure if this is normal but my MPG has went down since taking out my stock airbox and adding a filter to the stock intake. Granted, I will hit the gas for a second to hear the BPV bc I love the sound. Also my commute to work is only about 3 miles so my driving is very short. But is a drop in MPG common with this?

Norrie

Discussion Starter · #6 · Apr 17, 2014

So you're getting worse fuel economy? I thought it was supposed to get ever so slightly better from what the veloster kids were saying.

6thElementEngineering

· #7 · Apr 17, 2014

Redturbo said:
Not sure if this is normal but my MPG has went down since taking out my stock airbox and adding a filter to the stock intake. Granted, I will hit the gas for a second to hear the BPV bc I love the sound. Also my commute to work is only about 3 miles so my driving is very short. But is a drop in MPG common with this?

Theoretically, MPG should increase, keeping all other variables the same. This is also under the assumption the new filter you have is more efficient (read: better flowing) than your stock air filter.

Here are some possibilities:

1. You are getting into the throttle more often, or deeper (like you said, to hear the BOV noise more) - this will cause drop in mileage
2. The replacement air filter you put on there isn't as good as your stock filter setup (i thought a saw a spectre filter in your pictures, and they aren't known for being that great).
(I can't confirm this without measuring air flow between your stock and aftermarket filter)
3. a combination of #1 and #2

Also, your short drive is not long enough to take consistent data, and city stop and go driving for short distances makes that even worse. I would try to take an average over a full tank to 2 tanks of gas with each setup, then compare those numbers.

Hope this helps.

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stirider

· #8 · Apr 17, 2014

Redturbo said:
Not sure if this is normal but my MPG has went down since taking out my stock airbox and adding a filter to the stock intake. Granted, I will hit the gas for a second to hear the BPV bc I love the sound. Also my commute to work is only about 3 miles so my driving is very short. But is a drop in MPG common with this?

I've read on the veloster forums that it damages the engine and that you shouldn't put a filter on the BPV hose. Either you plug the BPV hose on the SRI or you just unplug it and go VTA....

See the picture below:

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6thElementEngineering

· #9 · Apr 17, 2014

stirider said:
I've read on the veloster forums that it damages the engine and that you shouldn't put a filter on the BPV hose. Either you plug the BPV hose on the SRI or you just unplug it and go VTA....

See the picture below:

View attachment 54

I wouldn't call it damage to the engine, but it is bad for the turbocharger for the BPV to have a restriction in flow (that little filter pictured). The air going through that valve has to have minimum restriction.
In that picture, they should just let the OEM valve vent. Or they hook the valve hose back to the intake. That little filter shouldn't be there.

stirider

· #10 · Apr 21, 2014 (Edited)

6thElementEngineering said:
I wouldn't call it damage to the engine, but it is bad for the turbocharger for the BPV to have a restriction in flow (that little filter pictured). The air going through that valve has to have minimum restriction.
In that picture, they should just let the OEM valve vent. Or they hook the valve hose back to the intake. That little filter shouldn't be there.

I tried to completly remove the BPV hose to see if I like the sound(I made sure to cap the hole from the hose removal on the intake). I wanted the pshhh sound and it's loud !! Based on the veloster's forums they said there is no risk for your motor if you completly remove it.

6thElementEngineering

· #11 · Apr 21, 2014

stirider said:
I tried to completly remove the BPV hose to see if I like the sound(I made sure to cap the hole from the hose removal on the intake). I wanted the pshhh sound and it's loud !! Based on the veloster's forums they said there is no risk for your motor if you completly remove it.

Correct, nothing bad will happen if you cap the hole on the intake tube like you did.

Redturbo

· #12 · Apr 21, 2014

After only two days of not getting on the throttle as much I have noticed my MPG is better than before the stock airbox removal and adding the filter to the stock intake. Usually my MPG was around 25, now I'm seeing it hovering 26mpg
Not much difference but it's something

Redturbo

· #13 · Apr 25, 2014

Alright everyone, I'm going to be ordering the injen SRI. I have talked to them and even though I can not return the item, I'm 99.9% positive it will work. I'm going to sell the turbosocks CAI/SRI on the VT forum. Sadly it takes 2-3 weeks for the injen to ship but I will let everyone know if it fits! I know a few of you are just waiting to throw one on your car.

Norrie

Discussion Starter · #14 · Apr 25, 2014

There are plenty available on ebay.

Redturbo

· #15 · Apr 25, 2014

What is? @norrie

stirider

· #16 · May 16, 2014 (Edited)

I've been running turbosocks SRI for a week now, it's really loud. The only bad side is that the hose inlet that goes on the compressor side of the turbo isn't tight enough so there's a vibration on the brake pedal....I will buy a smaller clamp so it doesn't move and create vibration when the car is moving.

Dalas

· #17 · May 17, 2014

stirider said:
I've been running turbosocks SRI for a week now, it's really loud. The only bad side is that the hose inlet that goes on the manifold isn't tight enough so there's a vibration on the brake pedal....I will buy a smaller clamp so it doesn't move and create vibration when the car is moving.

Can you post some pictures?

Cheers,

stirider

· #18 · May 17, 2014

Sure will do tommorow.

Sent from my SM-N900W8 using Tapatalk

6thElementEngineering

· #19 · May 17, 2014

stirider said:
I've been running turbosocks SRI for a week now, it's really loud. The only bad side is that the hose inlet that goes on the manifold isn't tight enough so there's a vibration on the brake pedal....I will buy a smaller clamp so it doesn't move and create vibration when the car is moving.

what part of the SRI goes on the intake manifold?

Dalas said:
Can you post some pictures?

Cheers,

Yes, please do....

stirider

· #20 · May 22, 2014

Sorry i've been fairly busy lately as I had my finals in engineering.....

There goes my picture....The brake pedal flutter stopped after re-tightened every bolt...

To be honest the last pipe could be more curved and it would fit better. Overall satisfied it's VERY loud. Will post a video once I get my turbo back 3'' installed later on.

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