Thinking of getting the HKS intake kit for my 07 Jazz (m/t VTEC). The problem is..HKS kit is very short and I'm worried that it'll only suck hot air from the engine.

ok..here's my thought...built a box arnd the pod filter so that hot air from the engine wont be sucked right in.

what do u guys think?

 

then why not just stick with the stock air box?

 

I would go with either a chamber intake or a full cold air intake, my honest opinion (sorry SRI guys) is that I think an SRI is a waste of money for that exact reason.

Let me qualify my statement so I at least get my reasoning out; Sure an SRI is going to increase your airflow slightly, but the stock box actually draws air in from the outside similar to an cold air intake. On the Dyno it might show an improvement, but in real life when it gets hot out and you are running your engine for along time, you are drawing in hot engine bay air. At least with the chamber intakes you are getting the throttle responce increase and they tend to draw closer to the outside of the engine. The other thing about SRI's is a lot of them (when tested independently) tend to have worse performance results than the stock box. OK, in a big engine bay (lets say a truck, Jeep, large muscle car... ect) an SRI is fine, but in the Fit you have a cramped engine bay that is generating lots of heat. I just don't see the value in it.

Anyway, my 2 cents. I know lots of people out there like SRI's and I apologize in advance for stomping all over somebody's mods. This is just my opinion, I always try to keep an open mind to those who disagree.

 

warm air is REALLY not that big of a deal....people need to dyno more stuff to realize this.

the reason CAI's make more power is LENGTH, PERIOD. Make a long intake that is still completely in teh engine bay...and you will STILL make more power. it's all resonance.

a stock box is cool and all...but it's got several resonators and the convoluted tube isn't nearly ideal...but isn't THAT big of a deal...considering the air directly on teh sides of hte intake is basically unmoving anyways.

 

Ok, I am always open to discussing stuff. Like I said, I keep an open mind to these things so I can learn.

If you were to throw a newer car on a dynamometer, what is the average difference in power percentage wise per degree for engines of this size?

 

you might see a difference....if you compare ambient temps...but that's not real world testing. there's constant air moving under your hood...there's a high pressure zone under the car, and a low on top...air comes from the bottom up..and out around your cowl. if you believe there's an issue of underhood heat ever, you can simply remove the moulding around the cowl panel...and it'll actually do something for you.

 

Yeah but when I do a lot of long driving or even get stuck in traffic, if I pop the hood it is like an unbearable heat wave that comes out. EDIT: Looking at a new post today Claymore has some measured temps: (Post #3) https://www.fitfreak.net/forums/fit-...mperature.html

The other thing is, air that goes into the engine bay is first exposed to the radiator which transfers enough heat to cool the water into the air, then to the engine & components which act as a giant heat sink for the whole system.

I can see how improving airflow to the engine will help, no doubt it would do something for my engine. That considered, I still think you are going to have a big difference in intake temps when you consider an SRI to a CAI.

I was reading up on it a bit and it looks like around a 1.8% difference in air density per 5 (celsius) degrees. That has got to translate into a power gain over 30 degrees.

Actually this is a pretty good discussion. Would like to hear more insight on it from other people.

 

OK..a reason I wouldnt go for CAI is I live in Indonesia...a country where drainage systems cant get any worse so I dont want my engine to suck up flood water.

The second question..y not stick with stock airbox..the stock airbox has a tiny hole that draws air from behind the fender. I guess this kinda restrict air flow. Also the factory flexible piping tends to compress under load which again restrict the air flow.

Where did I get these info from? I used to be a mini cooper forum member and there were several mini owners did some tests with different types of intakes. Yes..the CAI performs better than SRI. But SRI performs better than stockies. I also had an experience with SRI in my MIni and the differnce is noticable, but not 100% sure if it does the same to my Jazz.

 

lol, yeah you can't argue with that logic! Yeah CAI is no good if you are prone to run through large puddles and flooded roadways on a regular basis.

I used to have an FIPK system from K&N for my Jeep, although it was an SRI it definetly improved the performance. Then again my engine bay probably could have fit a couple of FIT engines in the empty space Another important note about the K&N one is it had a heat shield from the engine bay, most of the air it could draw was from the fender well and an opening to the front grill. (Maybe heat dosn't matter, but K&N seemed to put in the countermeasures anyway) I think SRI performance depends a lot on the vehical, some cars seem to respond well while others don't really see much improvement at all.

How come you are not considering a chamber intake? From everything I have heard it sounds like the Fit engine responds joyfully to the chamber style intakes.

 

You're rite..

I think Fit's small engine bay may be a problem.

let's hear it from SRI owners..any1?

y am I not considering chamber intake? The only chamber intake I can find over here is zero1000 (Top Fuel) and i'm not convinced by the design it has. Secondly if I was to import one in..it's gonna be very very expensive

 

who cares what kind of air goes in it, sacrifive the one 1 hp and leave it open

and i agree keep the stock box, its clean, homeade + fit = trash imo

 

lol, 90% of homemade intakes never turn out very well Every once in a while I see one that is pretty ingenious though.

I would tend to agree with YazzFlute, because your requirements are unique and availability to products isn't as good it might be a good idea to just drop in a K&N filter into your stock box. Then you get a modest increase in intake air, plus you keep sucking cold air from the fender without the risk of hydrolock. Kind of the best of two worlds.

If you are worried about the intake hose flexing too much and compressing when you accelerate you could stiffen it up with some expoxy glue or something similar.

 

I'm not sure which homemade intake you guys are referring to. I'm getting an original intake kit by HKS (with pipes and filter). What I'm trying to do is to build a partition around the filter to block the heat.

Here's an example of what one of my mates had in his E46 and it worked very well:

http://www.hmsmotorsport.com/ximg/1921/e46.330.2.jpg

it's an ECIS kit for BMW

 

Cool, that pic looks good.

 

When your car is in speed, there are sufficient freshing cool air going through your radiator or bumper so aintake tempurature for a SRI wouldnt be that bad as described. Maybe the performance will be affected because of stop and go traffic which will occurs heat soak but usually it will not be that bad IMO.

As for CAI, I really like the high end pull of it but there's one thing that I hated the most "LACK OF RESPONSE" it will make the driveability of the car even worst especially to small engines. The other downside of it, it hydro locking.

 

I'm a SRI guy, just thought I'd comment from my experience. I played around with 3 intake setups - (4 if you count the stock setup)
first, I took the cover off the stock airbox, removed the filter, and took a cone style performance filter and fitted it to the rest of the factor unit. This made for the fun whooshing sound, but not much change, as the air was still getting directed from the same channels in the stock airbox assembly.

Next, I had one pipe, coupled to the throttle body, with a 90 degree bend, and cone filter - the most basic SRI you can think of. I took it off for a couple reasons. first, it was a 3 in. pipe, so it rubbed on the battery, even though I shifted it as far to the fender as possible. Second, the filter was directly facing the radiator and thus the warmest air in the engine bay was getting sucked in. Using scan gauge there was a noticeable difference in air intake temp higher then the stock/semi-stock setups.

Lastly, the one I'm sticking with for now, is a modified SRI - I have a 90 degree coupler from the throttle body to a 90 degree pipe going the opposite way. It lines the filter directly at the space in the fender behind the headlight where the rubber OEM tube took air to feed the stock airbox. Intake air temps are lower on average between 4-7 degrees - dependent on the time of day, where I'm driving, how fast, etc. but overall, its a noticeable decrease in air temp from stock.

However, the filter is resting on the radiator hose below it so I need to figure out a better anchoring setup for the intake. But, it sounds nice, makes some noticeable difference and I don't have the fear of hydrolocking. So, if you're not sure about CAI for one reason or another, I'd consider this setup. Also, I'm thinking of working on some custom ducting to direct more air from the airdam/lowe fascia up to the filter.

Anyway - there are costs and benefits to all the different setups - for me, I like the DIY approach and it was cheaper. For others, the CAI looks cool under the hood, makes great high end power, and thats that. Whatever you like, do it if it makes you happy, that's my philosophy (just be mindful of the consequences if there are some )