Cone intake on a NA
 

I have read now mulitple times for different cars that using a cone intake actually has made the HP lower, and I am wondering if anyone has proof (like Dyno time, or track time) showing that a cone intake actually provides more HP for a NA FC.

Intresting on my V6 Toyota Tacoma, the 2nd gen K&N cone tube intake kit (which runs an almost identical route over the engine that the FC intake does) turned out to have an average of 6 HP less (over the rev band) than the stock filter case, with a K&N panel filter.

Same thing on my SC400 with an aftermarket rice style HKS intake.

So I am again wondering if there really is any proof that the cone filter replacement is worth the investment on a FC.

Thats an interesting question... I wish I knew the answer. I don't have access to a dyno, but when I put my cone on, I didn't notice much difference, hardly any really. It does look nice though, lol.. I'm curious how a filter that is supposed to flow better than stock lowers hp?


~Jesse

I don't think a cone filter does a whole lot on it's own. If you have headers and no cats, I'm sure a cone filter could only help to create a free flowing air system.

Obviously more restriction than stock or warmer air from the engine area is raising intake temps.

As far as exhaust, I do have headers on my truck, but have been reluctant to do them on the FC due to noise on the NA FC models.

I just put a come intake on my NA not too long ago & didn't notice any gains at all. I didn't notice any declines in performance either though. I would say you might be trading cooler air for more air if you don't build a cold-air box. That is next up for my car, plus a home-made ram-air system. Then we will see what happens.

Well here's my opinion on the subject and I'm not a expert by far. So if anything I say is incorrect feel free to correct me. The cone air filter will allow more air to pass through then a stock system. Due to a larger surface area and less of a restrictive passage. This helps out greatly if you have a aftremarket cat-back system. Lets say Racing Beat for example. That should raise the hp say 10% maybe more with that cone air filter. However that would decrease due to the hot air it would be coming from the heat of the motor. Kinda of sucks that Rotary's can get pretty hot. So most people get around that buy having a cold air box. That's why I'm still using the stock air box untill I get that cold air inlet headlight cover and build a cold air box. Remember folks just my opinion and what I hear from other people. Hope this helps out a little.

Sully

I got a K&N cone and adapter from ebay. I dont know how accurate this is, however the auction said that when put on a stock 86 gxl w/140k on the engine it made something like 6.7 hp and 5.4 ft lbs on the dyno. As i said i don't know how accurate this is or if the engine was hot at the time(probably not). It seemed to make a small diff on mine while cold, but i dont have a cold air box yet so we'll see.

To Mike (AE Turbo)
 

Cool picture in your signature, where can I get a full size copy
of it? Really shows the 13B engine well...

Thanks

I put an HKS intake on my stock 88. felt no difference. then put my RB header/presilencer on.(kept the stock original Y pipe and mufflers, going to get something custom there) Removed Air pump Etc. I think i felt a change but that feeling didnt last long. Maybe the custom Mufflers etc will make a difference but who knows. I heard that set adds up to 40hp to the wheels dyno prooved but who knows. I dont think you feel a real change unless its a big change. im gonna most likely get a donor 89+ Tll and street port etc. need big big change.

I dynoed my GTUs in three configurations: (1) Stock, (2)Cone Intake, and (3) RB downpipe and presilencer, plus cone. Stock, I put down 124rwhp (rear wheel horse power), with the torque curve peaking very low (~3K) and sloping off quickly. With the cone intake, the peak power only went up to 125hp, but the torque curve shifted up in the power band. This gave me more usable power; just not more peak power. Regardless, it was less than obvious without dynoing the car. Then, when I added the DP/PS, the power jumped to 147.3 rwhp with a table-top flat torque curve from 3k-8K. This is very good for a car with the stock exhaust manifold and stock cat back. I also have a fresh air headlight cover and a cold air box, neither of which will show benefits on the dyno so much as they will on the street, due to the ram air effect of actual driving.

Here are some pics of my intake setup, including my fiberglass cold air box:

Intake Setup

the cone makes the engine breath easier

Blake:
that cold air box looks REALLY good. :cool: How did you make that thing? do you have a how-to on how to make one like yours?

Cool blake,

That's the kinda info I was looking for

Great Job!
 

Very clean, and professional, do you have a set of patterns that
you could share with us?

That is pretty much what the doctor ordered...

I had a regular 2.5x4 small size cone intake on my car. Didnt gain anything at all from stock. So I put the stock one back on, but instead of fitting the original one back on. I took my spare one, cut out the middle part. So all i have left is a bracket that holds the air filter. With this setup, I actually gain more noise and power in any RPM. The difference is amazing just from cutting the stock air box cover. If you have a good clean filter (K&N) and a spare cover, i definitely would recommand this setup

Well a cone filter, or an open filter, actually should increase hp a little bit, but will lower torque -- at least that is the case on cylinder combustion engines... most of the time just an open air element will provide little to no NOTICIABLE power increase...The intermediate driver wont even feel hp gains unless they are over 5...

Introducing the Qualley Performance Cold Air Intake System!

Dyno Proven!

Easy to Install!

Great Looking!

Cheap!

:bigthumb:

Re: To Mike (AE Turbo)
 

Here's the copy I found on Yahoo Japan. It's a Japanese magazine ad for the FC. I rearranged it and added my car for my sig.

https://www.rx7club.com/vforums/atta...&postid=222868

Well, my only arguement against that is that you're leaving the intake exposed, right next to the exhaust. Hot air = less dense

So while you could get more air, the temperature of the air may or may not prevent you from actually getting more to the engine. A cold air box like Blake's probably helps significantly.

If nothing else, it's great from an ease of maintenenance standpoint, which is why I have one.

That and the little fucker is noisy. For a while I thought it was my belts makin' all that noise at idle. Then I stuck my ear down next to the filter and noticed that it was actually the intake making all the noise. It isn't noisy like an AEM CAI on a Honda, but it's definitely noticeable over the stock air box.

Hey, I hate to be the lone dissenter on this, but my son installed a Bonez kit from RP on his '88 NA, and both of us noticed an immediate improvement, especially below 4000 rpm! No other mods to the car. Why? I don't know, maybe the original air filter was dirty or something????

Irv, Keith's dad

I agree with Irv, Keith's dad. I noticed a bit of a change when I put my cone filter in. It seems to pick up a little better in the lower rpm range.

yeah,

putting my cone air intake on my 91 vert, I noticed an increase in power in the lower rpm range, along with an increase in engine note (not quite enough for me, though). Have a straight pipe for replacing my main cat, going on next week.

89 TII and 91 vert.

Would it be cool to put a stock K&N replacement?

i too noticed a pickup at low rpm's with the addition of a cone filter (Apexi setup). a little more power at low revs, and the car seems to run smoother...kind of like when you change out your plugs. plus i love the sound of it :).

i added a K&n and i dont know if it added or lost horsepower, but i know for sure it helped the throttle response time... this was all after a complete borla exhaust so i didnt really notice a power change.