1st gen q try this for one time
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rahiel aziz
- Posts: 37
- Joined: Tue Jul 23, 2002 8:57 pm
- Car: cars
1st gen q try this for one time
month ago i was changing air filter in my q so i got idea to play with air box just for fun.i don't know if some other member tried it already.please don't laugh try it one time.here what i did ,remove the bottom part of air box completly underneath u will see rubber stopper remove that .now i put the air filter on maf and put duck tape around it tried to seal it.than i started the car hoping to see some crazy idle nothing happened car idle normaly.so i took the car for a little drive car sounded more like a race bike when stepped on gas growl was more deeper .sounded like my friends q with k&n filter.espacially on the roll when i stepped on gas i could feel more pull.the deep growl is good to scare the driver next to u.i am having lot of fun just pull the car next lexus or bmw and tap on the gas, some guys instead of racing me duck behined thinking what got under that hood.so try it
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docsmile71
- Posts: 205
- Joined: Sun May 11, 2003 4:16 am
So basicallly what you did was make a ghetto WAI. Hey, whatever floats your boat.
If you want to make it a little more presentable and get more airflow, instead of duct taping the air filter onto the MAF go out and spend a few bucks and buy a cone filter and duct tape that onto the MAF...at least it will look a little better.
If you want to make it a little more presentable and get more airflow, instead of duct taping the air filter onto the MAF go out and spend a few bucks and buy a cone filter and duct tape that onto the MAF...at least it will look a little better.
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rahiel aziz
- Posts: 37
- Joined: Tue Jul 23, 2002 8:57 pm
- Car: cars
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
The stock air box [as measured in front of MAF after oem filter] has a restriction of around 5" Water Column at 6900 rpm [where the VE is around 70% [547 x 0.7= 382 CFM] ..........yet only 1.5" WC at 4,000 rpm wher VE = 90% or 285 CFM............around 4" at 6,000 rpm =360 CFM.
Measure the same parameters in front of the oem filter [test hole in bottom of air box and the 5" DROPS to 3.5" and the 4" at 6,000 rpms drops to 3.0" and the 1.5" drops to 1.25"
Somewhere around 6,300 rpm the valve lift/diameter and tuning falter and begin to stall the air flow [the curve reaches a peak and noses over].
The point I am making is there is essentially no restriction below 4,000 rpm in the air filtration, the MAF, the TB, the plenum, the runners or the valves............redesigning the system will at best not reduce power too much.
I guess if you had to have a mod, the best would be to leave the top of air box and filter in place to maintain the MAF calibration...the screen, the air horn in the top the oem air filter and it spacing from the horn etc.
Other than the hot engine compartment air you would ingest where even 11F hotter air [1% less dense] pretty much negates any gain from the slightly higher flow from lower restriction.
You must get some inexpensive temp measuring system so you can monitor your homemade air systems for hot air leaks.
Measure the same parameters in front of the oem filter [test hole in bottom of air box and the 5" DROPS to 3.5" and the 4" at 6,000 rpms drops to 3.0" and the 1.5" drops to 1.25"
Somewhere around 6,300 rpm the valve lift/diameter and tuning falter and begin to stall the air flow [the curve reaches a peak and noses over].
The point I am making is there is essentially no restriction below 4,000 rpm in the air filtration, the MAF, the TB, the plenum, the runners or the valves............redesigning the system will at best not reduce power too much.
I guess if you had to have a mod, the best would be to leave the top of air box and filter in place to maintain the MAF calibration...the screen, the air horn in the top the oem air filter and it spacing from the horn etc.
Other than the hot engine compartment air you would ingest where even 11F hotter air [1% less dense] pretty much negates any gain from the slightly higher flow from lower restriction.
You must get some inexpensive temp measuring system so you can monitor your homemade air systems for hot air leaks.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
No! I'm saying the entire top of oem air box and the oem filter are part of the MAF calibration.........when you change either/both the exact MAF calibration [X air flow reads Y voltage] will change.Whether this is good or bad depends.
Without a air flow bench to check the REAL air flow you don't know if changes affect the 2% accuracy of the MAF!
Any error at idle/cruise could be problematic?A slightly [0.1 volt in the 4.0 volt top range] lower voltage [error in reading air flow] MIGHT be benefical as it would lean the mixture at high rpms.
Without a air flow bench to check the REAL air flow you don't know if changes affect the 2% accuracy of the MAF!
Any error at idle/cruise could be problematic?A slightly [0.1 volt in the 4.0 volt top range] lower voltage [error in reading air flow] MIGHT be benefical as it would lean the mixture at high rpms.
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rahiel aziz
- Posts: 37
- Joined: Tue Jul 23, 2002 8:57 pm
- Car: cars
thats what i did left the top of air box attached to MAF i think thats why i am not getting any abnormal idle.only way u can keep the air filter attached to the air box is with tape.about the hot air how about putting a piece of card board in between air box and carbon canister like some member did for cone filter.since temp in NY dropped into 40's Q been running pretty strong .twice i left a l998 LS400 and gs400 off the line never done that before i used to pass them after 60mph.i don't if it is air filter or finally found some good gas in brooklyn.
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
The point I keep trying to get across is the factory air system is very good! 4.0" of water is 4/28............1/7th of a psi restriction which is 0.1428 x 0.066=0.0094285 or ~~~~~~1% restriction at maximum rpm and nothing at idle or cruise even 4,000 rpm.
The reason the cone filters seem to work is the hotter compartment air fools [causes the MAF to read lower], which leans the fuel flow which defeats the build in safety [amount] in ecu. AS the ecu runs close to 10.5AF at high rpm WOT.......whereas something like 12.0 AF might produce a little more power as the expensive of engine combustion temperatures.
In Winter you have much more safety than 100F Summer.
The reason the cone filters seem to work is the hotter compartment air fools [causes the MAF to read lower], which leans the fuel flow which defeats the build in safety [amount] in ecu. AS the ecu runs close to 10.5AF at high rpm WOT.......whereas something like 12.0 AF might produce a little more power as the expensive of engine combustion temperatures.
In Winter you have much more safety than 100F Summer.