Intake air flow modification

[rh77]

The spring sounds like a good idea to try out, but when people are behind me in town, I always feel guilty that I'm holding up people that are in a hurry. I'd end-up stomping on gas despite the extra tension, and my right calf muscle would be buff. (See the Hanz and Franz pic in another thread around here somewheres). Anyways, if it's the car's fault (restrictor plate), I'm not entirely guilty -- don't blame me, it's the car - mentality. But that is only if it yields better gas mileage. But yeah, some Toyota variants that I've driven have a soft throttle -- it is painful to keep your foot out of the firewall.

RH77

[GasSavers_Ryland]

what I'm seeing happen is this:
if you block off your intake, you are able to open the butter fly valve in your throttle body farther, those butter fly valve cause alot of turbulance, causeing the air entering the engine to swirel, creating drag, so really it's a simaler affect as installing a smaller carb, or throttle body, you are able to run closer to WOT more of the time, thus a smother flow of air is entering the intake, it's all airodinamics.

[MetroMPG]

hi ryland (welcome to the site).

that's the first bit of evidence i've heard in favour of the restrictor.

if turbulence from the throttle plate is a fuel efficiency drawback in throttle bodies, i wonder why carmakers don't use a different design, like a variable diameter aperature rather than a butterfly valve.

[rh77]

It's easy enough to do, so if I can sneak into the garage this weekend, I'll block-off part of the intake and run a test. Drivability will definitely be very different. I just wish I knew the algorithm for throttle input and manifold pressure on OBD-II Hondas. If I got my hands on the ECU's schematic I probably wouldn't know how to read it, though.

RH77

[Matt Timion]

Originally Posted by MetroMPG

hi ryland (welcome to the site).

that's the first bit of evidence i've heard in favour of the restrictor.

if turbulence from the throttle plate is a fuel efficiency drawback in throttle bodies, i wonder why carmakers don't use a different design, like a variable diameter aperature rather than a butterfly valve.

I know it's not exactly the same, but you DID make this post a while back:

http://www.gassavers.org/forum_topic/throttleless_premixed_charge_engine_ultimate_wai.h tml

I've been dreaming of it ever since

[GasSavers_DaX]

Originally Posted by MetroMPG

hi ryland (welcome to the site).

that's the first bit of evidence i've heard in favour of the restrictor.

if turbulence from the throttle plate is a fuel efficiency drawback in throttle bodies, i wonder why carmakers don't use a different design, like a variable diameter aperature rather than a butterfly valve.

I once wondered about an aperture style wastegate, but it would be expensive to create.

If turbulence from the throttle plate is a drawback, then the claims from devices like the Turbonator are definately bunk, as these types of devices do just that - create turbulence.

[rh77]

I'm hoping that more throttle and the choking effect has an impact on power production, as opposed to what the air is really doing, to reduce the need for fuel. I may be way off, but less air would require less fuel for Stoich, right?

RH77

[SVOboy]

I just wish I knew the algorithm for throttle input and manifold pressure on OBD-II Hondas. If I got my hands on the ECU's schematic I probably wouldn't know how to read it, though.

You want fuel and ignition maps?

[SVOboy]

I may be way off, but less air would require less fuel for Stoich, right?

Ya manG.

[rh77]

Originally Posted by SVOboy

Ya manG.

Sa-Weet. My theory may hold. By the way, thanks for the fuel maps S-Dogg! I might consider altering the maps for optimum efficiency.

RH77