One day I thought to myself why does the stock air box have these square like structures in the air box on my 90 N/A FC?



So I thought maybe I could grind them down and get more smoother air coming down into the MAF. So I began the process of this.





Eventually I got to this but I'll need a small rotary tool with a wirer or grinder attactment to get to those hard to reach places for that though. I did sand down the high spots with 150 grit sandpaper. And maybe some 350 - 400 grit later.



I have notice the throttle is a bit more responsive after 2k - 7k rpm.
I still do want to grind out the top part of the stock air box for less resistance in air flow. Free-ier flowing air box mod? What you ya'll think?

 

those little structures there are probably to reduce noise

 

Very interesting! I like!

 

Could be but doesn't the intake snokel have a silencer on it and a small hole at the begining of the snokel?

 

That gridwork is very standard reinforcing for plastic stamped parts.
There is no way that grinding it away made any difference whatsoever to airflow through the box or throttle response.

 

I can tell you it feels slightly different than before. I have 2 stock box so I can always swap back if needed.

 

i'll give you a stock airbox and let you get back to back dyno's stock and your 'modified' box. it would shut these guys up and let you prove your 'improved throttle responce'. i really don't see any harm in doing this. if the box was to break, they're easy to find.

 

The placebo effect.

 

Butt dyno effect.

 

***** effect.


I mean very interesting. Maybe find someway to test the airflow capabilities of your modified box compared to a stock box?

 

Irrelevant.
Measure airflow through the throttle body instead, that would be useful.

It's possible that "porting" the airbox increases flow- almost certainly of the "measurable" instead of "discernible" variety but for the sake of discussion I'll concede it- but you then run it through the stock MAF and the intake elbow, both of which are bigger restrictions than the airbox could ever be.
Net gain at the throttle plates...zero.

Even granting a measurable increase in CFM- and I think I'm being very generous doing so- it could not be significant enough to result in a gain big enough to feel.

Sorry but I still call shenanigans.

 

lol, i just told him it was probably a waste of time, but oh well, i did alot of that stuff when i first started on cars too. i didnt know the difference.
hes a great guy, local to me. hes smart, he gets it, some things are just for fun

Lloyd

 

Fair enough.

 

throw in a aftermarket air filter in there and mod the throttle body while your at it.

 

I have a K&N drop in. TB mod is possibly next.

 

LOL then thats what its for then. I'll finish grinding out the box and top next weekend and have some others locals drive my fc and see that they say.

How would I could test for airflow?

 

Sorry but there so many restrictions after its doing nothing

 

You'd need a flowbench.
Basically, there is no simple way to document your results.
An instrumented flowbench could show how it worked or some dyno time would provide even more relevant data.

Best of all would be to have two FCs at the dyno and swap the airbox cover between the pair.

It looks like you did a very nice job removing the webbing, I just think your enthusiasm and effort could be better rewarded in other areas.
Another thing to keep in mind...
These cars are now 20 years old and lots of smart people have molested them.
If something as simple as grinding the airbox cover really worked, don't you think we'd all know about it by now?

 

Well its off to the dyno after I mod finish modding the box. Well time to get to the body work then.

 

its about damned time, sick of looking at that oreo you call a car :P

Lloyd

 

Let me know when the next dyno day is I'll go out there with ya.