In this case, its very good :D

Here's my dyno with Adam's intake:

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/great-results-m2-stage-3-ecu-362737/

Very substantial gains from 5k up. This has to be one of the cheapest worthwhile mods that you can do to your car. :)

Sonny

Sonny, that looks pretty good. Would you mind posting the pic of the dyno on this thread with a brief explanation of what you did?

Thank you, Adam

Adam,

No problem. Here is a closeup that better shows the area in question:

http://www.rotormafia.com/dyno/closeup.jpg

The gains start as low as 5500 and go from there. They vary between ~5whp to ~13whp.

On the final run where I disabled your mod, I opened the airbox and laid a piece of duct tape over the opening in the airbox. Then, inside the nose, I stuffed 3 small towels into the inlet duct so that no air could get in.

If you look at money spent vs power gained, this is one of the most cost effictive mods you can do. I'm happy with it! :)

Sonny

Sonny,

Just to make it clear, the blue line was the first pull with the modded box, and the green line is the pull with the mod disabled.

Your dyno test shows a nice difference between stock with K&N, and modded with K&N. I wonder how much difference there would be comparing completely stock (OEM filter) to my mod with K&N. I would bet that the K&N is worth 3-5hp at your power level. Looks like my mod with K&N is worth more than 15 hp over a "completely" stock airbox.

Thanks again for posting your results. Its nice to see some real HP numbers :)

Adam

A lot of time and thought went into his design and the installation and fitment went very well. I did a lot of research before making a decision and I am glad that I went with the CBI. The price is right, keeping stock look is nice in CA, and it certainly makes more scense than sucking hot air in like most aftermarket intakes. Everyone spends tons of money on upgraded intercoolers, why not start with the coolest intake air possible to maximize the stock or any intercoolers potential.

On a side note, I made another modification that may be of some help for some of you out there. The 3 plastic clips on the passenger side of my airbox were broken by a previous owner and I had nice looking ghetto zip ties straped around the airbox. While I had everything apart for the intake install I made a quick fix that may be of some benefit to others out there. Sorry, no pics, but this is what I did. I drilled 6small holes in the bottom portion of the airbox. One to the right and one to the left of where each clip should be. I then fed a zip tie through the holes and made a loop. You could also use wire, but I didnt have any. I now have 3 homemade plastic loops where the stock ones used to be. I then drilled a screw through each of the 3 plastic nipples on the top half of the airbox that is designed to sip into the plastic clips. I left about 1/2" of the screw head hanging out. The plasic is very thick and supports teh screw nicely. I now tightened down my zipties over the screws to make a nice, tight clamp to hold the box halves together. And you really dont even notice the modification unless you look for it since its down o the side of the box. Just an easy successful fix that I figured may help others with broken clips as it seems to be a fairly common problem. Best of luck to everyone and take it easy.

-Hank West

Hank,

Thanks for posting with your thoughts. I'm glad you are pleased with the setup :)

I think many of us have broken tabs/slots on our stock airboxes. On mine, I think one of the slots that the tabs go into, is broken. Your idea of drilling a couple of holes for a zip tie sounds like a good one. The zip tie could be used to hold the tab in place. I have not had the box off in a while, so please refresh my memory. The slot is on the bottom section, and the tab is on top right???

I just installed my Greddy SMIC and did the stock air box cold air mod.

My PFC temps in 65 degree weather reads an average of 41 degrees C with my fans running.

Is this good for this setup?

Glad things went well with the installation. Please let us know how you do against the M3 that barely beat you before the mod. I think you will beat him now :D

This should be a good supplement to Adam C's mod.

https://www.rx7club.com/forum/showthread.php?t=371072

Sorry Penguin, I recommend keeping the stock inlet open. It provides an excellent secondary source of cool air, especially at higher speeds when air is forced in thru the pressurized area in the nose. If someone insists on removing the stock inlet, it looks like your product would be ideal.

If it's open won't it draw hot air?

Steve tested the the mod with the entire stock intake tract, and with the stock inlet blocked. He found that with the the stock inlet open, the car felt "livelier". The car performed better. Although the stock intake tract is restrictive, it still allows an FD around 220 rwhp when completely stock, and thats pretty fast :)

It is possible to draw warm air thru the intercooler with the stock intake tract, but that would only be at very low speeds, or when stopped.

adam's mod is great :) easy to install, stock looking, functional and cost-effective! good job "cheap bastard" :)

Shinchrono,

I'm happy to hear that things went well with the install. Good luck with the rest of your project :)

Adam

Installed this intake on the weekend - it seems to perform very well. I ran full throttle tests with my RE Amemiya open intake immediately before installation and ran the same test with this intake (and K&N drop in) after installation about two hours later. Temperatures were about the same for both sets of runs. I got the same maxumum 10 p.s.i each time, which would indicate (semi scientifically) that both intakes have pretty similar flow rates. (I am not using a boost controller so it would not have adjusted - I use a pill in the wastegate line, which I did not change between runs).

I suspect that this setup gets significantly more cold air too - the inlet to the ducting is in direct front airflow next to the radiator. Both intakes seem to add about the same butt dyno horsepower and responsiveness over stock. (The REA intake was on for only a week so I still remember stock pretty well.) The noise with setup is very marginally more than stock at lower speeds and seems to be the same at higher speeds or at idle. With the open intake, the noise was preposterous - it sounded as if a pregnant cow was having labour difficulties under the hood.

Thanks for posting your results. This is the first time that anyone has posted any kind of comparison to an open intake. It's nice to know that the "butt dyno" feels an equal level of performance between the two.

I'm also glad that you like the noise reduction compared to the RE Amemiya. As you mentioned, some of the open intakes sound awful.

Got my C.B.M. intake mod installed! Thanks Adam. The car "feels" like it pulls a lot harder (especially on a cool night) (one eye on the road, and one on the A/F gauge :ret: ) I gained ~1 p.s.i. of boost :bigthumb: Thanks for the suggestion on the zip-ties.

I'm glad you like it :)

The zip ties sounded like a good idea, but I can't take credit for it. Someone earlier in this thread told me about it. He is now a lifetime member of the Cheap Bastard Club :D

Air box
 

Do i have to send my airbox to you?

Then i have a problem, i dont got anny airbox.... :p: :eek:

Attachment 699955
Attachment 699956

I hope you didn't have to punch yourself too hard :D
I didn't design the kit to be pretty, since it can't be seen when installed. Making it simple and functional was my goal. It's good that you are happy with the performance.

Thanks, Adam

lets not forget the issue of smog testing in California!. this mod looks just like a stock box when you pop the hood. also when you get stopped for traffic violations the airbox and exhaust are the first things officers will look for.
Jeff

That's right. It can't be seen by cops or smog techs.

Thanks Jeff :)

No problem Adam! Great mod

i like adam's airbox mod so much im posting in both his threads lol. GREAT mod. :naughty: