Part # for K&N 'Shorty' 4 inch air filter
04-25-09, 09:31 AM
#30
mmm doritos
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ahh i see...your right im not too familiar with some 3rd gen setups..there has to be some way though to do something a little better then just a filter on the turbo..i guess it all depends on intercooler and radiator like you said but i know ive seen some cold air intakes on third gens before. Elliot at turblown has made some and he said he did a back to back dyno comparison with the filter right on the turbo and then one with a ambient intake and the ambient gained 20 WHP!!! that's pretty surprising to me..it would be worth getting a custom manifold made to maybe allow you to run the intake..of course im a 2nd gen guy so i dont know exactly what you guys are dealing with..
06-19-09, 12:46 PM
#31
bump
I've been running this filter now on my FC for break-in. Since it's an FC I have a little more clearance for a longer filter. Should I get one? Does anyone have any dyno numbers for this filter? I'm wondering at what point it becomes restrictive. I am running a T04R.
I've been running this filter now on my FC for break-in. Since it's an FC I have a little more clearance for a longer filter. Should I get one? Does anyone have any dyno numbers for this filter? I'm wondering at what point it becomes restrictive. I am running a T04R.
06-19-09, 03:57 PM
#32
Personally I've used that filter before. If you have room for it - get a larger one.
One the dyno I've observed its flat top piece being sucked inward at 18+psi.
never had any issues with it breaking or anything (other then getting dirty super fast), but to me its a filter for space needs only.
One the dyno I've observed its flat top piece being sucked inward at 18+psi.
never had any issues with it breaking or anything (other then getting dirty super fast), but to me its a filter for space needs only.
06-25-09, 10:31 AM
#35
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I went through this issue a while back. A 4" 90 deg silicone elbow that has a tight radius could work. i believe thr rx7store carries them. This will allow room for decent size filter. You could search around for an 90* aluminum elbow but not sure you could turn the tight corner. Here's a link.
http://www.aptuning.net/Elbow_90_Deg...tp-sil-062.htm
http://www.aptuning.net/Elbow_90_Deg...tp-sil-062.htm
06-25-09, 07:39 PM
#36
Original Gangster/Rotary!
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I've been thinking of running one of these, it has a gentler bend:
http://www.extremepsi.com/store/cust...at=1538&page=1
and one of these to attach the coupler to the filter (bottom of the page):
http://www.boostcontroller.com/index.php?category=34
http://www.extremepsi.com/store/cust...at=1538&page=1
and one of these to attach the coupler to the filter (bottom of the page):
http://www.boostcontroller.com/index.php?category=34
06-26-09, 07:37 AM
#37
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The K&N filter im using is 5.5". Not sure if this is correct, but doesnt a 90 deg bend reduce flow by 10%? I took that into consideration and thought there would be no improvements.
10-28-09, 08:34 PM
#39
Racing Rotary Since 1983
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"Hello Howard,
Thank you for your interest in K&N products. The following part number will flow X amount of CFM at 1.5” of H2o:
RD-1450 = 791.68 CFM...... (should max out at 412 rear wheel rotary hp)
RD-1460 = 1,187.52...... (good for 618)
When replying, please include this email. If you have any further questions, please call our Customer Support Team at 1(800)858-3333. Thank you for writing and have a great day.
Thomas Walden
Technical Support &
Sports Marketing
800-858-3333
ThomasW@KNFilters.com"
i received the above after inquiring about two filters. both fit 4 inch turbos. 1450 is 6 inches in diameter. the 1460 is 7. 1450 is 6 inches long the other 9 inches. based on the K&N CFM numbers many will come up short with the, uh, short one. howard
Thank you for your interest in K&N products. The following part number will flow X amount of CFM at 1.5” of H2o:
RD-1450 = 791.68 CFM...... (should max out at 412 rear wheel rotary hp)
RD-1460 = 1,187.52...... (good for 618)
When replying, please include this email. If you have any further questions, please call our Customer Support Team at 1(800)858-3333. Thank you for writing and have a great day.
Thomas Walden
Technical Support &
Sports Marketing
800-858-3333
ThomasW@KNFilters.com"
i received the above after inquiring about two filters. both fit 4 inch turbos. 1450 is 6 inches in diameter. the 1460 is 7. 1450 is 6 inches long the other 9 inches. based on the K&N CFM numbers many will come up short with the, uh, short one. howard
Last edited by Howard Coleman; 01-03-10 at 07:52 AM.
10-29-09, 01:43 PM
#41
For those of you who may not know: centrifugal compressors are dependent upon mass to function, and are much more efficient at pushing than sucking. Creating a depression at the inlet will shift the op points on the compressor map. (e.g., low pressure = less mass = less compression)
In my own experience, significant inlet restriction increases apparent spool time and makes the setup feel less responsive/laggy. In severe cases, it can limit boost.
I would suggest running the biggest filter you can for best results.
In response to the smogSUX post: The bend will have less restriction so use the longer filter with the 90.
10-30-09, 08:53 AM
#44
Racing Rotary Since 1983
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combine the above filter w an enclosure and pick up outside air from next to the radiator similar to the M2 box and pick up 40 degrees cooler air. engine compartment air is 150 F.
i am building such a box to accomodate that filter in my new setup. it has to be outside air and it has to be a big filter.
hc
i am building such a box to accomodate that filter in my new setup. it has to be outside air and it has to be a big filter.
hc
12-28-09, 09:14 AM
#47
Racing Rotary Since 1983
iTrader: (6)
there's something really wrong w building a great motor, adding lots of fuel, ignition, a 1000+ CFM turbo...
and then adding a filter that is restrictive and sucks in 180 degree air from the engine compartment.
or is it just me?
the K&N numbers, above, show an RD-1460 9" filter is needed for anything GT35R (897 CFM) or larger.
someone needs to start making a nice M2 like airbox that will fit the RD-1460 filter.
we need 100% outside air and we need the monster filter.
howard
and then adding a filter that is restrictive and sucks in 180 degree air from the engine compartment.
or is it just me?
the K&N numbers, above, show an RD-1460 9" filter is needed for anything GT35R (897 CFM) or larger.
someone needs to start making a nice M2 like airbox that will fit the RD-1460 filter.
we need 100% outside air and we need the monster filter.
howard
12-28-09, 10:58 AM
#48
"Elusive, not deceptive!”
Quote
"combine the above filter w an enclosure and pick up outside air from next to the radiator similar to the M2 box and pick up 40 degrees cooler air. engine compartment air is 150 F.
i am building such a box to accomodate that filter in my new setup. it has to be outside air and it has to be a big filter.
hc "
Howard, it can be done.
Notice air temps of 19ºC on a 15ºC day.
The hardest part was the convoluted passage on the side of the radiator leading to the airbox, ( see post 28).
Barry
"combine the above filter w an enclosure and pick up outside air from next to the radiator similar to the M2 box and pick up 40 degrees cooler air. engine compartment air is 150 F.
i am building such a box to accomodate that filter in my new setup. it has to be outside air and it has to be a big filter.
hc "
Howard, it can be done.
Notice air temps of 19ºC on a 15ºC day.
The hardest part was the convoluted passage on the side of the radiator leading to the airbox, ( see post 28).
Barry
