Who Sells Replacement Air Filters for 2002 Firehawk
12-09-2007, 10:42 AM
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Who Sells Replacement Air Filters for 2002 Firehawk I have a bone stock 2002 Firehawk with the 345hp air lid. I want to replace the air filter but I don't know where to but one. Does SLP still sell them?
12-09-2007, 11:10 AM
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If you're talking about the paper Donaldson elements, I don't think they're still available. I do know that you can get the Donaldson ones from SLP that look like "blue" K&N filters.
-Matt
-Matt
12-09-2007, 03:04 PM
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If you want the closest to the original Donaldson filter as you're going to get, Amsoil makes a cleanable (but NOT oiled) filter using Donaldson nanofiltering technology to fit our cars. It is part # EaA 83. Flows like the MAF killing oiled filters, filters better than the paper throwaways, and is cleanable to last 50-100K miles. 
12-09-2007, 04:41 PM
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The original Donaldson was dry paper and it is very, very slightly
better than the Purolator. Talking like 1/4" H2O (1/2" drop for the
Donaldson vs 3/4" for the Purolator and 7/8" for Fram and OE, at
a flow which causes 2" H2O pressure drop on a stock screened
MAF. Basically there's a dime's worth of difference between
them all, so don't go looking for ways to burn a $50.
posted June 11, 2002 07:47 PM
--------------------------------------------------------------------------------
I saw a minimal difference between paper and
the Donaldson filter in my "Shop Vac Test".
That is, at whatever flow rate the shop vac
was capable of, [totally uncalibrated, but
relatively repeatable] These are the pressure
drops I recorded, in inches of water:
Lid, no filter: 0 - same as open shop vac port
Lid, Donaldson: 1/2"
Lid, Purolator: 3/4"
Lid, Fram: 7/8"
Lid, OEM: 7/8"
By comparison:
OEM Lid, open: 1-1/8""
MAF with screen: 2"
The Oiled membrane filters will be somewhere
between the paper filters, and nothing. Yeah,
you could gain a whole 1/2" H2O of pressure.
That's like, what, 0.02PSI of boost. Maybe the
intake flows twice as much as my shop vac. Call
it 0.04PSI. Our throttle area is < 2X as big.
On the supercharger price/performance scale,
you're looking at something like $300 per PSI
of boost.
So if the filter costs more than $12, it's more
expensive per lb of boost - incremental horse-
power - than a supercharger.
From what I read, each PSI of boost looks good
for maybe 30 HP. Sanity check this as 325HP stock
HP / 14.7 PSI = 22 HP/PSI.
So using the latter, the ultimate filter [zero
drop] would give you about 22HP/PSI*0.04PSI or
1HP over the better paper ones.
Woo-hoo! Ain't science fun?
I put the Donaldson in a box and run with the
Purolator since that last horsepower isn't
someting I use often and the filter's not
cheap [I dunno if I can even get a replacement].
better than the Purolator. Talking like 1/4" H2O (1/2" drop for the
Donaldson vs 3/4" for the Purolator and 7/8" for Fram and OE, at
a flow which causes 2" H2O pressure drop on a stock screened
MAF. Basically there's a dime's worth of difference between
them all, so don't go looking for ways to burn a $50.
posted June 11, 2002 07:47 PM
--------------------------------------------------------------------------------
I saw a minimal difference between paper and
the Donaldson filter in my "Shop Vac Test".
That is, at whatever flow rate the shop vac
was capable of, [totally uncalibrated, but
relatively repeatable] These are the pressure
drops I recorded, in inches of water:
Lid, no filter: 0 - same as open shop vac port
Lid, Donaldson: 1/2"
Lid, Purolator: 3/4"
Lid, Fram: 7/8"
Lid, OEM: 7/8"
By comparison:
OEM Lid, open: 1-1/8""
MAF with screen: 2"
The Oiled membrane filters will be somewhere
between the paper filters, and nothing. Yeah,
you could gain a whole 1/2" H2O of pressure.
That's like, what, 0.02PSI of boost. Maybe the
intake flows twice as much as my shop vac. Call
it 0.04PSI. Our throttle area is < 2X as big.
On the supercharger price/performance scale,
you're looking at something like $300 per PSI
of boost.
So if the filter costs more than $12, it's more
expensive per lb of boost - incremental horse-
power - than a supercharger.
From what I read, each PSI of boost looks good
for maybe 30 HP. Sanity check this as 325HP stock
HP / 14.7 PSI = 22 HP/PSI.
So using the latter, the ultimate filter [zero
drop] would give you about 22HP/PSI*0.04PSI or
1HP over the better paper ones.
Woo-hoo! Ain't science fun?
I put the Donaldson in a box and run with the
Purolator since that last horsepower isn't
someting I use often and the filter's not
cheap [I dunno if I can even get a replacement].
