K & N magic trick
08-26-2014, 12:39 AM
#62
Rennlist Member
Dyno's are not the way to test air flow.
Personal experience with my 928. Drag strip runs...stuck at 14.02...14.01.....14.02..... figured I'd throw the K&N on the car for the final run.... broke into the 13's (13.99) that run.... Never had oil on my maf wire... no issues with the engine for the entire time I ran the K&N. (I cleaned and oiled it regularly using a very light coating of oil).
Worked for me. Only issue I've had with the K&N was fitment to the air box...need to make sure it's seated all the way round.
Personal experience with my 928. Drag strip runs...stuck at 14.02...14.01.....14.02..... figured I'd throw the K&N on the car for the final run.... broke into the 13's (13.99) that run.... Never had oil on my maf wire... no issues with the engine for the entire time I ran the K&N. (I cleaned and oiled it regularly using a very light coating of oil).
Worked for me. Only issue I've had with the K&N was fitment to the air box...need to make sure it's seated all the way round.
The main benefit is a constant volume of air that remains constant regardless of how hard you are getting on the throttle. Paper volume decreases if its has any dirt at all. Low rpm's probably negligent, high rpms and high constant rpms the K&N will benefit any engine. Gimmie air and lots of it...Hienrich "das boot"
Cool theory, but..is it reality in the 928?
Perhaps most OEM filters will flow more dirty than the engine will ever produce?
Waiting on what the K&N does that benefits the 928.
I mean, a 6.5L stroker on OEM filter making godzilla power numbers on OEM..
Oh ya..airplanes. K&N -vs- paper changes manifold pressure by exactly zero.
Perhaps most OEM filters will flow more dirty than the engine will ever produce?
Waiting on what the K&N does that benefits the 928.
I mean, a 6.5L stroker on OEM filter making godzilla power numbers on OEM..
Oh ya..airplanes. K&N -vs- paper changes manifold pressure by exactly zero.
again, ill go to the dyno with my car soon and do a test for you. paper vs KN.
08-26-2014, 02:24 AM
#65
Rennlist Member
I see no reason to use a K&N in the 928 as the filter is so large compared to most other cars it really does not put very much restriction on the engine.
Most cars have a filter 1/3 the size of ours, that includes a lot of GM performance vehicles like the corvette.
Those cars can appreciate improved flow, but it does have the cost of more crap going through your engine so there is no real reason to use them in our cars besides bragging rights.
They do toast mafs like nobody's business because of the oilso they should never be used on a LH jet 928 as a $50 filter is a lot cheaper to replace than a +$400 maf.
Most cars have a filter 1/3 the size of ours, that includes a lot of GM performance vehicles like the corvette.
Those cars can appreciate improved flow, but it does have the cost of more crap going through your engine so there is no real reason to use them in our cars besides bragging rights.
They do toast mafs like nobody's business because of the oilso they should never be used on a LH jet 928 as a $50 filter is a lot cheaper to replace than a +$400 maf.
08-26-2014, 06:24 PM
#66
well this turned out to be an entertaining thread. Since I don't race or drag I will continue to knock the dust off my old filter until the day I die. If you want minimum restriction at the strip: take out the filter. Since mine is a 79 I don't worry about a maf sensor. Love that old CIS. Keeps on tickin'. Hey, maybe I'll take her out tonight!
08-30-2014, 08:09 AM
#68
Rennlist Member
Great Mark, keep us posted on your test results. Would be very interesting to introduce a small amount of air born dirt into each filter and see what the results are.
09-02-2014, 02:54 PM
#70
Rennlist Member
yep.... i look forward to doing the test again, under controlled conditions. I bet , as i mentioned earlier, NOONE took the time to look a the fitting of the filter in the air box. ive seen so many bad fits, where you can actuallly see gaps in the filter to air box. the KN, not so much. and even with that, i make a silicon seal to make sure it was a perfect fit. (silicon coating to air filter.. .... wait until almost dry and then assemble to air box and clamp.... this makes a nice seal).. before doing this, i saw .5" Hg pressure change for a leaky air box vs sealed! thats what most are seeing on the dyno if they are doing a test.
as far as MAF polution........... just oil the outside, not the inside and that solves that problem.
as far as MAF polution........... just oil the outside, not the inside and that solves that problem.