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Taking up on MrMiata's/Latemodel's Intake Design...
Originally Posted by Mrmiata
(Post 743103)
Couldn't see the price of "devil horns" myself..so I made up my own scoops. Running filters under the hood into the stock air box didn't hurt my temps any and I'm now pulling air in through 2 3" tubes. "Expect" intake air temps to come down when I remove the OEM cover and replace with a "y" setup.
Ironically - was test fitting pipes from Ebay and bought one.. then a week later the other side. Temps were lower by 10-15 degrees running the drivers side cone and OEM setup on the passenger side.. (N/A Crossfire). About all I can figure is the cone was the primary air flow and kept that side of the air box from heat soaking - keeping temps down. https://www.crossfireforum.org/forum...coop-83846.jpg https://www.crossfireforum.org/forum...0289-84004.jpg I'm wondering....if you can punch these even further forward and through the grill (a 2nd hand one maybe) in some elegant way. I'm talking to fabtech re their setup ATM FTP Performance Mercedes Benz AMG Cold AIR Intake System CL55 E55 SL55 S55 CLS55 | eBay |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
I really don't see any benefit from this....I have ran open tubes and with filters with no change....
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Re: Taking up on MrMiata's/Latemodel's Intake Design.....
I turned up my hearing aid.. and it sounds awesome under the hood now! :p
So you see no advantage to having two 3" tubes sucking in air (same operating air intake temps as an OEM setup per Torque Pro) vrs the OEM and restricted from the start? |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
Nope, unless you were creating vacuum under wot in the air boxes which wouldn't be the case even in the SRT. Factory airboxes on some cars do run into that problem, my old S60R ran into that issue after bolt-ons and extra 8lbs of boost over stock, a vendor sold a kit that put an extra hole/intake route in the stock airbox that normalized the pressure at wot and gave or I guess returned about 14whp back toward the redline.. getting the same kit on a stock s60r netted 0hp gains even though it could breathe so much better. (same intake temps as well)
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Re: Taking up on MrMiata's/Latemodel's Intake Design.....
I did a quick search for info -
Found a guy who had done some "rigorous" testing in his Miata (coincidently) and compared different filters by hooking up a differential pressure gauge to his inlet manifold. Now I'm not sure this is a sound as NW_Rob's flow v 15"WG testing of airboxes, but indicative to say the least.... This guy found his stock air box without a filter to even burn off -5"WG at 6500rpm even without a filter. Other testing (I've subtracted the 5"WG)... K&N..................-1.3"WG Paper................-1.8"WG RacingBeatFoam...-1.5"WG 1psi = 27"WG So in summary the filter steals about 0.06psi. I'm very suprised ---------------------------------------------------------------------------------------------------- To put that into perspective, NW_Robs data at 15"WG for various DCAI and CAI and stock intakes etc. when normalised out to our WOT 6000rpm 90%VE and a 65mm pulley show.... Setup......cfm......airbox......ManiP......rwhp DCAI......706.....-13"WG.....19.2psi.....330 CAI........702.....-19"WG.....19.0psi.....328 Stock......689.....-36"WG.....18.4psi.....322 So there's obviously a lot more drop in our situation than for the miata's ------------------------------------------------------------------- Scoops....... there's a good intro to scoops...here.... Race Car Book in summary they produce the equation..... vehicle MPH = engine CFM x 1.64 / scoop area (square inches) which is the balance point where the scoop goes from being negative prs to positive prs 'cause its capturing more air than the engine can use. You'd want this around 55mph hey...so at WOT (700cfm) and 55mph the scoop area should be 20 in2 Having said that.... I found this here The formula for theoretical maximum ram pressure ('velocity head') is: p = pv²/288g, where p is the velocity head in psi Þ is air density in lb./cu. ft. v is velocity in ft/sec. (88 ft./sec. = 60 mph) g is acceleration due to gravity, 32.2 ft./sec/sec. on our home planet So for example, at 150 mph (220 ft./sec.): p = (0.076 x 220²)/(288 x 32.2) = 0.4 psi (~11 " H2O), or about a 2.7% potential power increase but when you take that back 50mph..... you get 0.04psi....so not very much until you're over 100mph (0.2psi) or a coupl'a rwhp |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
And here I thought I was just grabbing a little more cooler outside air to feed the beast.. ;)
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Re: Taking up on MrMiata's/Latemodel's Intake Design.....
Ram air has been chewed over a lot on this forum. See this thread and read the PDF in the first post.
Ram Air, Fact or Fiction. |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
Originally Posted by Billy22Bob
(Post 743394)
I did a quick search for info -
Found a guy who had done some "rigorous" testing in his Miata (coincidently) and compared different filters by hooking up a differential pressure gauge to his inlet manifold. Now I'm not sure this is a sound as NW_Rob's flow v 15"WG testing of airboxes, but indicative to say the least.... This guy found his stock air box without a filter to even burn off -5"WG at 6500rpm even without a filter. Other testing (I've subtracted the 5"WG)... K&N..................-1.3"WG Paper................-1.8"WG RacingBeatFoam...-1.5"WG 1psi = 27"WG So in summary the filter steals about 0.06psi. I'm very suprised ---------------------------------------------------------------------------------------------------- To put that into perspective, NW_Robs data at 15"WG for various DCAI and CAI and stock intakes etc. when normalised out to our WOT 6000rpm 90%VE and a 65mm pulley show.... Setup......cfm......airbox......ManiP......rwhp DCAI......706.....-13"WG.....19.2psi.....330 CAI........702.....-19"WG.....19.0psi.....328 Stock......689.....-36"WG.....18.4psi.....322 So there's obviously a lot more drop in our situation than for the miata's ------------------------------------------------------------------- Scoops....... there's a good intro to scoops...here.... Race Car Book in summary they produce the equation..... vehicle MPH = engine CFM x 1.64 / scoop area (square inches) which is the balance point where the scoop goes from being negative prs to positive prs 'cause its capturing more air than the engine can use. You'd want this around 55mph hey...so at WOT (700cfm) and 55mph the scoop area should be 20 in2 Having said that.... I found this here The formula for theoretical maximum ram pressure ('velocity head') is: p = pv²/288g, where p is the velocity head in psi Þ is air density in lb./cu. ft. v is velocity in ft/sec. (88 ft./sec. = 60 mph) g is acceleration due to gravity, 32.2 ft./sec/sec. on our home planet So for example, at 150 mph (220 ft./sec.): p = (0.076 x 220²)/(288 x 32.2) = 0.4 psi (~11 " H2O), or about a 2.7% potential power increase but when you take that back 50mph..... you get 0.04psi....so not very much until you're over 100mph (0.2psi) or a coupl'a rwhp |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
Originally Posted by onehundred80
(Post 743401)
Ram air has been chewed over a lot on this forum. See this thread and read the PDF in the first post.
Ram Air, Fact or Fiction. dinasrt....apologies, but I've never been considered "in the majority" - in case you hadnt already guessed.;) |
Re: Taking up on MrMiata's/Latemodel's Intake Design.....
dinasrt....apologies, but I've never been considered "in the majority" - in case you hadnt already guessed.;)[/QUOTE]
Don't worry, I'm sure that most MB owners feel the same way as you.;) |
Re: Taking up on MrMiata's/Latemodel's Intake Design...
bada bing!:D
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Re: Taking up on MrMiata's/Latemodel's Intake Design...
1 Attachment(s)
came across this....
another variant |
Re: Taking up on MrMiata's/Latemodel's Intake Design...
Originally Posted by Billy22Bob
(Post 744779)
came across this....
another variant |
Re: Taking up on MrMiata's/Latemodel's Intake Design...
Originally Posted by Mrmiata
(Post 744780)
I like the price of mine..:D So I won't even ask.. lol.
https://www.crossfireforum.org/galle...e_opening1.jpg |
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