LT1 TPI TBI Air FOIL

[philly rs]

did he say 3psi? that wont boost our heavy ass cars anywhere.... that was a joke right?? that may make my rear hatch open a bit faster or help my windows go down a second faster, wth was that? and ram air hoods are about as usless as a knife in a gun fight, unless u have a bad ass car that gets to higher speeds real fast before it gives u any gain the race is over. i see ram air cars with cold air intakes on them all day every day, u will be better off that way.

[94GPSHAKER]

blind x i meant the 90 degree angle not tempurature wise. all you need to reduce temp of throttle body is on the bottom, block off the coolant port. an air foil's main purpouse is to yes redirect airflow it is kind of like when you are custom making header collecters you dont just jam all 4 tubes into the one, you have to cut the middle of all 4 tubes at an angle to get them to merge to one properly not restricting the flow of air. and a tb port and polish job aside from being a waste of money for a maximum of 6mm? if that would cost the average person around 200 bucks just spend the money on a nice holley Dual 58mm 1200 cfm throttle body for around 300 bucks and you dont even need an air foil. hey sick streetz what kind of nos setup you got? i was thinking about getting into a nice wet 100 shot system for the lt1 after the turbo comes through. and theres no way that some crappy cold air even k+n could give you as much hp tq as a good straight through ram air setup. every 90 degree angle cuts down on air flow dont quote me on the figures but i think its about 10 percent each 90 degree angle even if its mandrel bent that is why chevy switched to the smaller 82mm but straight through throttle body designs after 97. as for anyone with straight through LT1 ram air (mostly custom rare as hell to find, not on the SS either that has a 90 degree bend too) if you put on a bigger tb you could have up to a total of 116mm of tb space and you dont want any restrictions in air.

[Savage Messiah]

a true ram air setup does not "ram" the air (blower effect) until speeds of say, 120-140 mph, because there's just not enough velocity to cram that much air in. It functions as yet another cold air intake, and with more bends than a underhood CAI

[94GPSHAKER]

well i dont know where you herd 120-150 because i have been up to 165 with 3:7:3 gears and the acceleration from after 40 mph (true ram) which is when i heard it actually took affect seems to be more appropriate, i didnt suddenly feel it jerk my head back at 120 or anything but if i wanted to i could have roasted in the first 3 before 80.
97 rs do you have a LT1 or or just saying what you heard. there is NO bends in a true ram air setup. Just a High flow custom filter -MAF-throttlebody.
but who really cares just get a S/C if you want a big dif.

[Savage Messiah]

no, I have a 3.8 and I'm saying what I've researched and what other on this board have found (89, where the hell are you?). Also the "ram air" setup on, say, ss's and ws6's isnt a TRUE ram air... but with the angled throttle body on the LT1 and early LS1's, how would you go about with your ram air setup?? it would HAVE to bend, unless you went custom throttle body... and hood. and filter/airbox.

[LT1MAN]

the air foil just eliminates that dead space in between the butterflies where air just spins around before being sucked in, the air foil just makes it so the air goes straight up the intake and straight in the tb, nowhere for it to go. but i dont understand what it wouldn't work for me

[blindeyed]

Originally Posted by 94GPSHAKER

well i dont know where you herd 120-150 because i have been up to 165 with 3:7:3 gears and the acceleration from after 40 mph (true ram) which is when i heard it actually took affect seems to be more appropriate, i didnt suddenly feel it jerk my head back at 120 or anything but if i wanted to i could have roasted in the first 3 before 80.

I even asked my college physics teacher. Even he stated that you will see no dramatic gains from ram air untill you are exceding well over 100mph. And even then, the aerodynamics of the car with the scoop will increase the air resistance. So overall, ram air may look nice and seem cool.. But you can get the same performance, if not even more, from a cold air intake.

[89IROC&RS]

do me a favor, do a forum search on ram air before making any more comments. this applies to everyone.

Ram Air - is the intake system used on the SR-71 black bird at supersonic speeds. The SR-71 uses gas turbine engines which is why this system works.

Cold Air - is what is used on cars, this includes the hood scoop and airbox setup used on F-bodies that is mistakenly labeled and referred to as "Ram Air" (see above) All this does is allow air from outside the engine bay into the engine, this increases power by delivering a colder, denser air charge, not by forcing any ammount of air into the engine.

The reason the hood scoop will never "Ram" air into a piston engine is that the engine has valves that open and close, when the valves are closed, air flow stops, and the scoop will pressurise to 1 atm, as soon as that happens, air no longer goes into the scoop, it diverts around it as though the scoop were solid.

So regardless of how fast you are going in your F-body, be it 100mph, or 500mph, that hood scoop will not "Ram" air into your engine. Its still just a cold air intake.


That being said, the airfoil is a perfectly wise investment. It does smooth out the turbulant airflow that builds up in front of the throttle body due to the design of the factory unit. This does increase overall flow. You probly wont notice the difference by the seat of your pants at low speeds, but at high speeds, youll be able to see the difference in times and speeds at the track.

[94GPSHAKER]

89 iroc thanks, I guess i got my info screwed up on that. LT1 man did your foil come with the gasket? the only way i dont see it working is maybee when you put the piece inside the tb it may have been in just the wrong spot and might be slightly rubbing against the throttle fins and it didnt want to open.

I Tell you what i live in michigan and its finally above 55 today it is so nice to have my t tops off and smokin stangs.

[LT1MAN]

Originally Posted by 94GPSHAKER

89 iroc thanks, I guess i got my info screwed up on that. LT1 man did your foil come with the gasket? the only way i dont see it working is maybee when you put the piece inside the tb it may have been in just the wrong spot and might be slightly rubbing against the throttle fins and it didnt want to open.

I Tell you what i live in michigan and its finally above 55 today it is so nice to have my t tops off and smokin stangs.

no gasket,

dont see it working is maybee when you put the piece inside the tb it may have been in just the wrong spot and might be slightly rubbing against the throttle fins and it didnt want to open.

it wouldn't even idle, crank then die, and theres pretty much only one spot it will go in bc you have to put that long screw through it.

[94GPSHAKER]

under your stock clean air cover (the thing with the 6 torx screws) there should have origionally have been a rubber gasket that took up the entire surface of the openings, the new gasket is almost like cardboard/cork material and is just like a gasket and does not cover the entire opening. something to do with the stock one still being there is messing it up i believe. if you need a gasket il give you a link to the e-mail of guy that i know at CRTperformance. let me know peace

[blindeyed]

Originally Posted by 89IROC&RS

do me a favor, do a forum search on ram air before making any more comments. this applies to everyone.

Ram Air - is the intake system used on the SR-71 black bird at supersonic speeds. The SR-71 uses gas turbine engines which is why this system works.

Cold Air - is what is used on cars, this includes the hood scoop and airbox setup used on F-bodies that is mistakenly labeled and referred to as "Ram Air" (see above) All this does is allow air from outside the engine bay into the engine, this increases power by delivering a colder, denser air charge, not by forcing any ammount of air into the engine.

The reason the hood scoop will never "Ram" air into a piston engine is that the engine has valves that open and close, when the valves are closed, air flow stops, and the scoop will pressurise to 1 atm, as soon as that happens, air no longer goes into the scoop, it diverts around it as though the scoop were solid.

So regardless of how fast you are going in your F-body, be it 100mph, or 500mph, that hood scoop will not "Ram" air into your engine. Its still just a cold air intake.


That being said, the airfoil is a perfectly wise investment. It does smooth out the turbulant airflow that builds up in front of the throttle body due to the design of the factory unit. This does increase overall flow. You probly wont notice the difference by the seat of your pants at low speeds, but at high speeds, youll be able to see the difference in times and speeds at the track.

The only reason why I ever called the hood scoop air intake setup "Ram Air" is simply because that's the name Pontiac decided to call that air intake setup. I know exactly what true ram air is, I wasn't trying to mistake that for Pontiac's so called version of ram air. I don't really see a problem with calling it "Ram Air" if that in fact is the official name given to it by Pontiac.

[89IROC&RS]

Originally Posted by blindxeyed

Well, from what I understand. Ram air doesn't do anything until you hit 120mph. Even then the difference is so unoticeable, and it can hurt the car more than it can help it due to the lowered aerodynamics.

This statement indicates you were confusing the Fbody ram air, with true ram air. Fbody ram air is functioning even when the car is sitting still, speed has absolutely nothing to do with it.

[blindeyed]

Originally Posted by 89IROC&RS

This statement indicates you were confusing the Fbody ram air, with true ram air. Fbody ram air is functioning even when the car is sitting still, speed has absolutely nothing to do with it.

Ah, I see your point.

[89IROC&RS]

i do what i can