[7TRoadster]

Riggs,

Thanks for the ideas, great idea for a post. I plan on doing a cold air intake eventually so can use this information when working on mine.

 

[riggs 74]

I have an update about this CAI. The inclosed filter that I used in this setup is VERY restrictive. I was at the dyno today with my new tuner friend and found that this cold air intake setup was rubing the LS of losts of power. With all the tubing and filter I lost nearly 20 HP with just the mass air flow sensor and the inclosed filter I lost 10 HP, that filter is very restrictive.

I am going back to my old setup with just a 4" 90 elbo, mass air sensor and a 9" cone filter on the end until I can come up with a new setup.

Terry

 

[Patro46]

Have you thaught of using T split right in front of the throtle body that T's down in pipe size and then runs to each side of the engine compartment and then down with air filters that sit just above the lowest part of the frame?

Just a crazy idea I was thinking while drinking coffee and looking at your awesome pics.artyon:

What he said...artyon:

 

[Marks76ray]

Thanks for the update Terry:thumbsup:It's good to know about the restriction. So many authors have interesting threads, you read them, get to the end to find out there is no followup on the end results. I try to document the mods in detail on my build thread. Sometimes I wander if it wouldn't be better to make individual threads because someone new would have to read the entire build. Maybe I will do a page of continent at the end, sort of a reference for new folks. Anyway keep us posted, I know this is not over.


:cheers:
Mark

 

[brent319]

Well that is good to know. Thanks for sharing that with us.
I still need to come up with something for mine, and I will keep this all in mind.
So were you happy with your dyno numbers?

 

[riggs 74]

Some of the other CAI, I have been told to try don't seem to Have any flow numbers to support those ideals. I really thought my setup was good, my throttle response improved of the old elbow setup and it all seemed to work really well, but the dyno showed me a huge loss in HP that I'm not happy about.

The system has to be short, with minimal bends and preferably somewhere to get cold air. Straight forward and over the the core support is probably the best route, like the one Brent built for KOAS. Brent would you be in the market to build a few?? I'll take the first one please. Lol.

Dyno numbers were a little better than last time but still not where they should be with my 402, shameful. The motor is starving for air, not only through the CAI, but the stock LS2 intake manifold is to restrictive.

I forget the terms my tuner used but I was shown what the map sensor was reading while we were making pulls, as the rpms climbed, the map sensor was seeing the air intake struggling to keep up with feeding in fresh air, even when we eliminated everything but the mass air flow sensor, the motor was still starving for air. A stock LS2 manifold with 225 heads, 595 lift cam, and 1 7/8" headers don't seem to play well together.

I am looking at getting a FAST 102 LSXR manifold, possibly even ported from Vengeance racing, if the price is right.

I will find a way to get this motor to breathe as well as it should.

Terry

 

[Richard454]

Hey Terry-

Here's a video - some might find boring-use to work w/ this guy years ago...Interesting flowbench test on pipe-filters MAPs.


Definitely gives you a interesting perspective of what works and what doesn't-

 

[tektrans]

The flat filters are the least restrictive for obvious reasons. That inline filter is robbing you of HP because it is making the incoming air turbulent. The cone filter is better but still not ideal.
IMO-the best way to take advantage of a CAI is to have a run of tubing that is totally open and runs to a cold air box with a flat filter. Then you would need a relatively short straight shot into the motor after the box. The flat filter will have little restriction at speed and the airbox will function as a high pressure area that the motor can draw what it needs from.
Since you have an LS set up I wonder if you could similarly duplicate what I had done on my LS trans am. Here's a few pics if it helps you at all then great.

 

[graphicjunki]

That looks really good. I would be personally worried about water though. Heavy rain storm, and you are suckin' water in like crazy.

But all in all, looks very, very clean!!! :thumbsup::thumbsup:

 

[D_B]

That looks really good. I would be personally worried about water though. Heavy rain storm, and you are suckin' water in like crazy.

But all in all, looks very, very clean!!! :thumbsup::thumbsup:

Sucking in a little water won't hurt anything. In fact, water can help in some cases. I use water to break away and burn out the carbon that builds up on the valves and seats. Heck some guys even inject water like propane or nitrous.

 

[graphicjunki]

A little bit of water is one thing. But if you go through a deep puddle and pull enough in, then you are looking at hydro lock. That is what I'm talking about. lol...

Likely? No....
Possible? Yes....

 

[tektrans]

I always kept 2" vinyl tape in the car so if it started raining I would tape off the holes and the car also had a ram air hood and I had these little sheet metal peices I would bolt in when it rained as well.

 

[riggs 74]

Well I think I'm solving one problem at this point. Earlier today I ordered a fast 102 LSXR polished intake from Vengeance racing. They have a great deal on ported intakes until Friday, 899 ported. Its normally a couple hundred more on top of the $830 price tag. So this should let the motor breathe like it should along with the short 90 and large K&N filter that Ill be using until I come up with a new design for a CAI. The intake is expensive but at this point it is what this motor needs.

Terry