The only surefire way to find out is to have a temp sensor right before the turbo inlet, and one right after. Then do a run with and without the air duct in the same environmental conditions.
foglight air duct. who has one?
- Thread starter teamslow
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Can't remember the exact figures but it was something like 10>15c drop, I can replicate it no probs once I get the trans back in as I have hot and cold side AIT sensors that can be logged in the MoTeC.
Sweet! Was this with just an air duct setup? That's something like what you've got setup, right?
race car drivers use it in forced induction setups. But of course at 130mph+ that helps a good bit. But im sure cruising down the interstate it will surely help along with some drag strip passes.
Similar. So the round canister is the filter. Care to do a comparison of it with the tubing connecter through the firewall, and one without? 
A little overkill with the jumbo t-bolt clamps on a pre-turbo intake pipe eh?
A little overkill with the jumbo t-bolt clamps on a pre-turbo intake pipe eh?
I thought you guys were talking about just running a duct to the filter location. Running it that way DOES help.
I had to get a new filter and I couldn't get the setup to work anymore so its back in my engine bay.
I had to get a new filter and I couldn't get the setup to work anymore so its back in my engine bay.
SS5: No probs I can do that and yes the cannister has a K&N Filter pod inside.
I had spare T Bolt clamps so figured why not it keeps the look consistant
I had spare T Bolt clamps so figured why not it keeps the look consistant
Thanks Ian! This should give us a good idea of some gains from just having a filter pulling air in the engine bay, versus pull air from outside of it. Maybe we'll be able to see how much the charge heats up this way
its called adiabatic efficiency, look it up.
As air is compressed it creates heat proportional to the temperature going in and proportional to the amount of pressure created. Lower the initial temperature and you lower the temperature of the air coming out of the turbo.
Ever been to a drag strip???? As the night goes on your times dont just get better because your getting more practice but because the temperature is dropping as the sun goes down. The colder the ambient air going into the intake the colder it will be when it reaches your IC and therefore your IC can do its job a little better and you end up w/ more power.
What i have wanted to do is build an airbox/shield that blocks off my intake from the rest of the hot air in the engine bay/fan shroud. and restrict it to the snorkel hole. Everyone goes for the fog light hole but i never see anyone use the front duct by the turn signal instead. its more direct than anything and probably more efficient if ducted right.
As air is compressed it creates heat proportional to the temperature going in and proportional to the amount of pressure created. Lower the initial temperature and you lower the temperature of the air coming out of the turbo.
Ever been to a drag strip???? As the night goes on your times dont just get better because your getting more practice but because the temperature is dropping as the sun goes down. The colder the ambient air going into the intake the colder it will be when it reaches your IC and therefore your IC can do its job a little better and you end up w/ more power.
What i have wanted to do is build an airbox/shield that blocks off my intake from the rest of the hot air in the engine bay/fan shroud. and restrict it to the snorkel hole. Everyone goes for the fog light hole but i never see anyone use the front duct by the turn signal instead. its more direct than anything and probably more efficient if ducted right.
I used to run just the filter and saw a huge drop in charge temps by just adding the duct. (as I said just can't remember how big)
If you have any old records of it Ian that would be just fine, no need in going out and doing something over again just becaused you were asked to...
americanjebus said:
Yup, that's what I figured...
my car is NA, but as you can see, the headlight covers' scoop directs air straight into my HKS filter when the headlights are up..
I was actually shocked that it was a question whether or not an air duct like this would be effective. I had my filter located underneath the headlight in my other Supra and even just moving it out of the engine bay made a huge difference.
As I mentioned before, the turbo Volvos I used to have were especially crippled by hot intake temps. They actually suffered big power loss by running an open filter under the hood.
From a common sense standpoint, the only way that cooler intake temps wouldn't matter was if you could somehow set up a system with excess cooling capacity. That's clearly not going to happen in a Supra (unless you happen to be in a very cold climate all year long). Even then, depending on IC efficiency, you may still benefit from a colder intake charge.
Even with an upgraded IC, the intercooler efficiency is effected by the ambient temperature. As long as the ambient temperature is cooler than underhood temps (read: always!), it will be better to direct cooler air from a CAI rather than the hotter air in the engine bay.
As I mentioned before, the turbo Volvos I used to have were especially crippled by hot intake temps. They actually suffered big power loss by running an open filter under the hood.
From a common sense standpoint, the only way that cooler intake temps wouldn't matter was if you could somehow set up a system with excess cooling capacity. That's clearly not going to happen in a Supra (unless you happen to be in a very cold climate all year long). Even then, depending on IC efficiency, you may still benefit from a colder intake charge.
Even with an upgraded IC, the intercooler efficiency is effected by the ambient temperature. As long as the ambient temperature is cooler than underhood temps (read: always!), it will be better to direct cooler air from a CAI rather than the hotter air in the engine bay.
JUMPING ON THE BAND WAGON!!!:biglaugh:
I "cobbled" together my CAI (Crisp Air Intake) from parts as disassociated from my Supra as an old push LAWNMOWER GRASS DIVERTER!:aigo:
I IMMEDIATELY noticed the difference by way of LESS negative impact when driving in 80-90 degree heat than the few days BEFORE the mod... and mine's not pressurized, and only "partially" isolated from the engine bay... (But there IS alot of cool air being channeled in.)
I got some pics SOMEWHERE here... maybe...
(I wanted to stay away from the fogs, as I installed 4300k HID H3 capsules, and they are GREAT!:biglaugh: )
-crisp
I "cobbled" together my CAI (Crisp Air Intake) from parts as disassociated from my Supra as an old push LAWNMOWER GRASS DIVERTER!:aigo:
I IMMEDIATELY noticed the difference by way of LESS negative impact when driving in 80-90 degree heat than the few days BEFORE the mod... and mine's not pressurized, and only "partially" isolated from the engine bay... (But there IS alot of cool air being channeled in.)
I got some pics SOMEWHERE here... maybe...
(I wanted to stay away from the fogs, as I installed 4300k HID H3 capsules, and they are GREAT!:biglaugh: )
-crisp
Here are a few shots I threw together for someone else who asked about this... I'm not drawing THROUGH the fog light... but JUST underneath!:biglaugh:
There's how it looks at the moment. Everything is "rough installed", to experiment. It appears to be a noticable difference, so I am keeping it, until I can "improve" on the execution. I may "seal off" the area around the "cut hole" and the HKS filter, to make it a TRUE CAI with no "bleed-thru" from the engine compartment. Still playing with ideas.
You can see from the last shot that the filter is well separated from the engine compartment already. I am pleased with the concept.
(Try to overlook the "untidied" wiring, etc... and the duct tape... what can I say! DT FTW! HA!)
G/L with your efforts.
-crisp
There's how it looks at the moment. Everything is "rough installed", to experiment. It appears to be a noticable difference, so I am keeping it, until I can "improve" on the execution. I may "seal off" the area around the "cut hole" and the HKS filter, to make it a TRUE CAI with no "bleed-thru" from the engine compartment. Still playing with ideas.
You can see from the last shot that the filter is well separated from the engine compartment already. I am pleased with the concept.
(Try to overlook the "untidied" wiring, etc... and the duct tape... what can I say! DT FTW! HA!)
G/L with your efforts.
-crisp