I saw this cold air intake on ebay...it's just a piece of flexible piping which can also extend and collapse with a filter on the end.

It's way cheapter than a $300 kit.

Does anyone know why this would not be as good as the others?

Cheap Intake

Thanks,
J

 

One because the flex duct is not 100% airtight, two if it is airtight the vibration will soon render it non-airtight, and three it is a cheap *** piece of garbage.
Would you risk your engine on a piece of dryer duct?? Not me Hoss!!!

 

It would probably work. It's just a piece of dryer vent from the 'Despot', the real trick is to make sure you pull your air in ahead of the radiator, a lot of kits just suck hot engine compartment air.

S

 

 

Ha.. I remember using those back in the day on my Civic.

 

exactly, this is a cheap Home Depot intake you do on your first beater car, not an RX8 IMO.
BTW, you could goto Home Depot and buy some dryer duct hose and pick up a universal filter at Pepboys and some v-band clamps and do this yourself for around $15-20.

Dave

 

My buddy insisted that we make a PVC pipe intake for his Jeep Wrangler. We bought the pipe and glue from the Depot and the filter from AutoZone. What's nuts is that it actually worked, and good too!

I don't think this would work with the RX8, though. The engine temps would melt the plastic, not to mention you shouldn't be cheap about buying parts for your $30,000 car.

 

you get what you pay for + supply & demand.

 

4 hp = $300??? That's not getting what I paid for.

 

Word, and more like $500.00 for the REVI+duct guys.

 

What about K&N's intake? Those things sells for pretty much 250 on ebay.. You get the cone that K&N thought and their claims I would think match Agency Powers under drive pulley claims too the wheels... at 20 supposed wheel horsepower more too the wheels with both things done couldn't you claim to have increased horsepower by atleast 10%? sooo many people make that seem like a scam

 

K&N makes more top end power.

While Revi makes power thruout the whole rpm band, not as much as K&N in the top end.

but this intake .... I think I can make one myself for 20 bucks TOPs.

 

I just can't justify spending $300-500 for parts that net only a few hp. An intake put on an Evo nets 20hp (yeah, I know, it's FI), Scion tC=14-18hp, freakin Eclipse=12-16hp. RX8=3hp?! No thanks. I'll save my cash for forced induction.

 

Thats because Mazda did a really good job. Unlike Lazy Toyotas and Mitsu.

 

There's no doubt that Mazda did a good job, but think about it. If Toyota and Mitsu weren't lazy, we'd have high hp Scions and Eclipse's smoking the pants off of our "sports car" straight from the factory. Not good.

The Renesis sure is an improvement over the old N/A 13b. It only put out about 125hp.

 

just purchased REVi! havent installed it yet but hopefully ill get it in sometime soon!!!!

 

How do you like your sway bars, Tanaka? I was thinking about getting some, but I'm concerned that the front one might induce too much understeer. What do you think?

 

Companies are cleaning up on sellin a $20 air filter, some aluminum tubing, and couplers for $300. Just leave it stock and save your money. There are too many worthless mods for the RX8. Just save all the money from doing those mods and buy a turbo kit.

 

Amen to that, bro.

 

Actually it was 135 hp from 84-85, 146 hp from 86-88, and 160 hp from 89-91 but your point is still valid. The turbo cars were 186 hp from 87-88, 200 hp from 89-91, and then finally 255 hp from 93-up. That's the ONLY 2 rotor rotary that made more power than the Renesis stock.

 

PVC pipe is made to easily handle boiling water which is 212*F. If it's rated at that, it'll go hotter. How hot does your engine bay get? You'd have to be damn near overheating with no airflow at all to get that hot in the engine bay. You probably couldn't melt PVC in an engine bay unless you used it right next to the exhaust manifold. Keep in mind that any airflow through the pipe will also help remove any heat that is in it.

PVC is actually a pretty good insulator. There's no doubt that PVC "can" be made to work just fine. As with anything it's all about the design. I'm not saying that I encourage everyone to go out and buy PVC to build an intake with. I wouldn't.

 

I don't know about that... where did you get 14-18 on a TC? Did it have any other mods? From my experience, an intake on any car will only get you a few horses if the car is stock. Now if you're talking about an engine that is modded getting those numbers then I understand.

 

I was going off of what a Scion owner told me about the intake. Looks like it's kinda true....if you have an exhaust too. I'll beat him up later.

Anyhow, there's plenty of cars out there that can gain at least 10hp by adding an intake alone like a Corolla (K&N), Eclipse (Injen, AEM) etc. Giving you exact hp numbers for other cars isn't the point here. The point is that there are no real significant power gains to be made with an intake on the stock motor when compared to other engines. It only takes about five seconds of searching to realize that. I'm not trying to rip on people or anything, I just can't justify spending such a huge chunk of change on some 3 hp parts. Just add it up:

Intake: $350
Cat-Back Exhaust: $600
Pullies:$150
High Flow Cat-$350
Grounding Kit $125

That in itself adds up to almost 1/2 the cost of a turbo kit. All of those parts also net less then 20 hp. I would rather save my money for the turbo, that's all I'm sayin.

To each his own, and I totally understand the desire to mod. Until I can afford to put the big power in, I'm gonna work on the suspension.

 

BTW, that PVC intake on the Wrangler melted a little bit up by the engine. Not sure why. But with that in mind I would imagine that the engine bay temps would be warmer in the RX8. Time to call the Mythbusters!

 

It could be that having boiling hot water flow through a pipe for a moment and actually heating it up to that temperature and holding it there for a while could have totally different effects on the PVC.