Deckplate mod does nothing
#1
Deckplate mod does nothing
I decided to apply a scientific method to get an idea if the deckplate mod can have any real effect. As a guy with some HVAC background, I know a little bit about how air flows, and this test was fairly easy anyway. To test out if the deckplate mod has any effect all that one has to do is measure the vacuum in the chamber before the engine air filter.
The results: 0 vacuum under high load up a hill up to 4,000RPM. So for most real load situations there is no benefit whatsoever to putting holes in the airbox. None.
The results: 0 vacuum under high load up a hill up to 4,000RPM. So for most real load situations there is no benefit whatsoever to putting holes in the airbox. None.
#6
ISR is the resonator box? Don't see how it could affect anything either, as replacing it with a straight tube does not increase volume and does not decrease turbulence. Is there a scientific explanation why it should work?
#7
In theory, theory and practice are the same.
In practice, theory and practice are different.
In theory, nothing works but we know why.
In practice, it works but we don't know why.
When theory and practice come together nothing works and we don know why.
In practice, theory and practice are different.
In theory, nothing works but we know why.
In practice, it works but we don't know why.
When theory and practice come together nothing works and we don know why.
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#8
I decided to apply a scientific method to get an idea if the deckplate mod can have any real effect. As a guy with some HVAC background, I know a little bit about how air flows, and this test was fairly easy anyway. To test out if the deckplate mod has any effect all that one has to do is measure the vacuum in the chamber before the engine air filter.
The results: 0 vacuum under high load up a hill up to 4,000RPM. So for most real load situations there is no benefit whatsoever to putting holes in the airbox. None.
The results: 0 vacuum under high load up a hill up to 4,000RPM. So for most real load situations there is no benefit whatsoever to putting holes in the airbox. None.
the only true way to tell if it does anything would be a dyno, and even then it would be hard to tell because there might be a 1-2 hp difference
#9
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Here's some more info: http://www.gadgetonline.com/AirInduction.htm
BTW, how about the "air elbow" mod? http://www.4runners.org/writeups/airbox/index.html
BTW, how about the "air elbow" mod? http://www.4runners.org/writeups/airbox/index.html
#11
Registered User
Ok so It really does do some thing!
No it is not going to give more horse power!
No it is not going to make it sound really cool!
And No it is not going to give you colder air, actually a little warmer!
I run it because it gives me better throttle response!
Less Restriction to the air box less restriction to the Cylinder!
if you really want more horse power it is time to spend some dough!
or install a diesel
No it is not going to give more horse power!
No it is not going to make it sound really cool!
And No it is not going to give you colder air, actually a little warmer!
I run it because it gives me better throttle response!
Less Restriction to the air box less restriction to the Cylinder!
if you really want more horse power it is time to spend some dough!
or install a diesel
Last edited by eddieleephd; 07-13-2009 at 07:19 AM.
#12
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Well I left my lab coat at the lab... but the best explanation I can give you is that by removing the ISR you are saving several pounds of weight [not that it would make a truly measurable difference but there it is] and you are creating a more direct air route with a smoother airflow characteristic... it does not increase volume but it does make it easier to move what volume there is thereby increasing the overall efficiency of the intake side which provides the performance "boost" albeit at the expense of a louder intake sound. The same reasoning lies behind the deckplate mod you don't increase the vacuum or volume but the engine does not have to work as hard to move the air meaning it can put more power to the ground in this case at the expense of a slightly increased chance of large particulate ingestion [which would be caught by the air filter so no risk to the engine just more junk in the airbox] and of course a noisier intake. edit: If you check the gadget link above you will see that the deckplate mod actually does yield a measurable increase in performance.
Last edited by aviator; 07-13-2009 at 07:37 AM.
#13
And that's the trick. 0 vacuum in the airbox means no work is done on the pre-filter side. The filter itself is the most restrictive part in the intake, creating several orders of magnitude more air flow resistance than any other imperfection in the design of the intake.
#15
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BTW, how about the "air elbow" mod? http://www.4runners.org/writeups/airbox/index.html
#17
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i've had mine capped for about 4 years now, i never saw or felt any difference after doing the deck plate. good thing you can just screw the cap back in and basically be OEM again without the giant hole in the airbox. i removed the elbow too, still no difference to me. but, i drive like a grandpa anyway and i wasn't out much money or time so i'm just like "eh".
#19
This is the test that is sure to get some folks upset. Performance products is selling the K&N FIPK for $219. The K&N FIPK beats the stock box by .6 HP in 1st, 2.8 in 2nd, but looses to the stock box by 3.2 in 3rd for an average loss of .06 HP.
Now if you just cut open the front of the box you get 6.4 HP over the stock box for free or 9.6 over the K&N FIPK. Remember from the previous chart you will get basically the same results by removing the elbow as cutting open the box. I think this might be the way to go so you can pop it back in if you decide to go swimming.
Uh huh....
It does help. However, keep in mind...we all live at different altitudes...
Parker out..
Now if you just cut open the front of the box you get 6.4 HP over the stock box for free or 9.6 over the K&N FIPK. Remember from the previous chart you will get basically the same results by removing the elbow as cutting open the box. I think this might be the way to go so you can pop it back in if you decide to go swimming.
Uh huh....
It does help. However, keep in mind...we all live at different altitudes...
Parker out..
#20
Registered User
i put some stickers, on the underside of my hood, Borla, K&N, schneider cam,BF Goodrich, NWOR, Downey,LcE, Eagle Globe & Anchor, thats worth at least 10 hp there.