Ok, on my 5mgte i'm trying to pick out a Universal taper cone K&N filter. I've picked the biggest one I can physically fit in the spot. According to some calculations I found online for KN air filters... it flows 635 CFM. Is that enough for a turbo car? I've got a upgraded CT-26 that has the T4/T50 compressor wheel. I don't plan on going over 22psi. will that air filter flow enough?
Air filter CFM
- Thread starter Supra5MGTE
- Start date
My two cents: The limiting flow factor is not the filter, it's almost always the rest of the induction system. It's why K&Ns are such a bad deal considering the amount of crap they let in. A paper filter on a properly sized induction system will flow all the air you'll every need and filter a lot better too.
JJ- I agree with you. I'd love to find a paper "universal" cone filter. Only thing I can find to fit what i'm working with is the KN. Do you have any suggestions on finding a 3" cone filter that's paper... b/c that'd make my day.
No, sorry guy, I don't know of one. Doesn't mean they aren't out there though. There are also filters that flow just as well as a K&N but aren't oiled gauze (or paper) and filter better. My point was that paper filters the best and will flow all you need. Why do you need something like this anyway? Have you modified the airbox or induction system?
I have a turbo 5M '84 supra. Everything has to be custom fab'd. where my original air box was now runs IC pipes. I need a cone filter that will fit on the end of the 7mgte accordian turbo hose.
NICE. I looke dup a pic of the part number. I'll pull it off the shelf at work and see if it'll work. Thanks for the tip!!! That'll be a lot cheaper than a KN, filter a lot better than a KN too!
I have one of those HKS Mushroom filters and trust me stay away from them. But i have heard that the Filter offered by Blitz is a good one.
http://www.blitz-performance.com/Blitz_Intake_Sus.htm
http://www.blitz-performance.com/Blitz_Intake_Sus.htm
I'm no expert on filters but I've read enough real test data (compared to non-scientific testing) to have formulated the opinion I hold and it always shows paper is best, foam is second, and oiled gauze is way last. For example:
http://tinyurl.com/692ma
This applies when one is concerned about keeping crap out of course. For perfomance some will believe a "high flow" filter is better but as I said it's almost always not the flow limiting factor. Unless he builds a custom airbox (or uses the stock GTE one) he'll have to use a cone.
He could run a few oil analysis and see how it's performing. Could be it won't be much of an issue. Most perfomance seekers are more than willing willing to trade some wear for perfomance anyway.
http://tinyurl.com/692ma
This applies when one is concerned about keeping crap out of course. For perfomance some will believe a "high flow" filter is better but as I said it's almost always not the flow limiting factor. Unless he builds a custom airbox (or uses the stock GTE one) he'll have to use a cone.
He could run a few oil analysis and see how it's performing. Could be it won't be much of an issue. Most perfomance seekers are more than willing willing to trade some wear for perfomance anyway.
Hard to see in this link, but the Prelude filter looks more cylindrical than cone shaped. Looks like it might work though.
http://www.hondaautomotiveparts.com...ry4=KL5MT&catcgry5=AIR+CLEANER+(SI)+('88-'89)
http://www.hondaautomotiveparts.com...ry4=KL5MT&catcgry5=AIR+CLEANER+(SI)+('88-'89)
IT'S ALREADY ON THE CAR!!!! It worked out like a champ. $10, paper air filter; cylinder. it's got real deep pleats which is good. it slid right into the 7mgte accordian hose and I put a clamp on it. Done. That's deffinately gonna be my air filter for the street. Only reason I'll remove/KN it is if it restricts the flow to much. but for now... and probly a while. i'm good!!! Thanks for turning me onto the prelude filter!!!! Awsome filter. physically fits great too.
Hard to say but unless you live in a very dusty area it'll last a long time. Airfilters are probably right up there with O2 sensors and motor oil for being changed while they're still good. I'd say 20-25K miles minimum.
All filters filter better as they load up to a point but thereafter the effciency drops dramatically. It's why if you do use a K&N you shouldn't clean it very often no matter how bad it looks.
The best way to know for sure is to take a differential pressure measurement across the filter (or simply measure on each side separately) using a manometor or something similar. Many newer cars have such gadgets so it'd be possible to snag one and adapt it to work.
Otherwise just get a cheapie manometer on ebay or make one out of plastic tubing and colored (food coloring) water. I use tranny fluid when I build them. Called a slack tube manometer. Works well and cost pennies to make. Or change the filter when the inside shows dust while doing a "white glove" test. All this is a bit anal though.
All filters filter better as they load up to a point but thereafter the effciency drops dramatically. It's why if you do use a K&N you shouldn't clean it very often no matter how bad it looks.
The best way to know for sure is to take a differential pressure measurement across the filter (or simply measure on each side separately) using a manometor or something similar. Many newer cars have such gadgets so it'd be possible to snag one and adapt it to work.
Otherwise just get a cheapie manometer on ebay or make one out of plastic tubing and colored (food coloring) water. I use tranny fluid when I build them. Called a slack tube manometer. Works well and cost pennies to make. Or change the filter when the inside shows dust while doing a "white glove" test. All this is a bit anal though.
i didn't mean restrictivness from getting dirty. I meant restrictive in the sense it'll restrict the turbo's job of sucking air in. as in if i'm runnin 18PSI on a T61 ball bearing turbo... is that filter gonna flow enough w/out causing a large pressure drop.
As long as the induction system is big enough paper will flow all the air you'll need. That's assuming it's not tiny of course. We we're talking about a particular media's ability to flow remember, not filter size. Putting on a crankcase breather filter is obviously going to restrict flow but if this filter is near the diameter of the induction system (or bigger) you're golden. Think of it the same way as your previous quest for a larger oil filter because the same principles apply. After all gases (in this case air) and oil are both fluids.
AEM Dryflow filters are apparently very good.
Apex-i is the best as far as I know. Until I see tests for AEM's...
Apex-i is the best as far as I know. Until I see tests for AEM's...
that's what I figured. this filter is decent size. it's 5.5" OD, 2.83" ID on the pipe, and about 6" long. Pleates are deep, and lots of them. I just don't wanna starve/choke my turbo of air supply.