Design and build throttle body

[Motorsports-X]

I just don't think that it will give you the resolution you need as you describe it, as you will be directing air over it with the throttle blade.But once you run it and get some data maybe it will be useful?

Any data from it will be useful. Its just a matter of scaling. So if i plug everything in, and get 16.0 afr where i am supposed to get 12.0 afr, then I just need to tell the ecm to expect "***" value from the MAF to equal 12.0. it doesnt really matter "what" the value is, just that you have a consistent repeatable value that never changes. (never changes, in respect to a particular RPM and Throttle position)

 

[c1500deathtrap]

Thats great, but whats the total are of those throats? What i'm saying is you'll be going from idle to oh **** pretty quick. Needs a good mechanical advantage on the pedal so you can control the opening speed by using alot of pedal movement to little throttle movement. And as a result of that you'd need a progressive throttle setup to get WOT.Try driving a car with a synchronous throttle bore dominater carb. Because thats the kind of airflow you'll be getting. not to mention it'll be a ***** to tune.

 

[Motorsports-X]

Thats great, but whats the total are of those throats? What i'm saying is you'll be going from idle to oh **** pretty quick. Needs a good mechanical advantage on the pedal so you can control the opening speed by using alot of pedal movement to little throttle movement. And as a result of that you'd need a progressive throttle setup to get WOT.Try driving a car with a synchronous throttle bore dominater carb. Because thats the kind of airflow you'll be getting. not to mention it'll be a ***** to tune.

nothing is properly sized in that model yet. its just ball parked to as a rough draft, but they are approximately 3.5in sq, per side. you are correct about needing a progressive throttle opening, and I have a couple ideas in mind to make this happen, but I have not set either in stone. thats going to have to wait until more of the design is completed. Mechanical leverage around the perimeter of a circle has this effect naturally, (same reason a piston moves slower at bdc and tdc) so its not terribly complex to make it work. just a matter of proper placement

also, the tps will still be tied directly to the throttle plates, so I will still be able to detect 0-100% opening just as stock. it might be a pita to tune... maybe not.. we will see! even if it doesnt come off idle perfectly, so long as it tows at 3 grand smoothly, Im happy. WOT wont be a problem

 

[Motorsports-X]

also, fyi. the plates are shaped like that because this is the intake its sitting on. I wanted "effectively" a longer runner length, and this gives it a couple more inches. remember the runner length is calculated from the port, to the common point of all cylinders. might not work. we'll see. if it doesn't, ill just make a 86mm round one and call it done. (the little notch in the intake should only be effective at low rpm. and when its on the IAC valve. At high rpm, this tb will act like a longer runner intake)

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[c1500deathtrap]

You can't change runner length with a throttle body. It's measured from the valve to the plenum opening. And at high RPM a shorter intake runner is desired.

 

[90halfton]

I admire your attitude, initiative, and desire to "build" something as opposed to just assembling things. It's an art that seems to be lost anymore.

 

[90halfton]

MAF's don't like eddy currents and weird flow. It really needs to be stuck in a long straightish tube. Maybe stuff it in a choke collar over the TB? but even then it wouldn't read right. Is this going to be a wet or a dry manifold?

I hope you're not referring to the Eddy currents that occur in an AC induction environment.

 

[90halfton]

MAF's don't like eddy currents and weird flow. It really needs to be stuck in a long straightish tube. Maybe stuff it in a choke collar over the TB? but even then it wouldn't read right. Is this going to be a wet or a dry manifold?

I hope you're not referring to the Eddy currents that occur in an AC induction environment.

 

[Motorsports-X]

You can't change runner length with a throttle body. It's measured from the valve to the plenum opening. And at high RPM a shorter intake runner is desired.

"technically" you are correct, but in practice, keeping the intakes divided down the center for an extra couple of inches gives you a 1>2>8 intake runner, that has longer effective runner length. ....vs what would be in a 1>8 runner system. just like headers, there is 4>1 and 4>2>1. which works better? depends on the application. Technically if you count the openings in a carb, you get 1>4>2>8 with a dual plane intake. (1 counted as the "common point" of air volume) and 1>8 with a single plane intake. The intake being open/common under the carb "effectively" makes the intake runner short, which in turn makes more power up top. The dual plane "extends" the effective runner length by moving the common point of air volume up above the carb. My design takes (what i believe to be) the best of both worlds. sorry if i worded that horribly and confused anyone more than anything. hard to put in words.

Also, longer runners make more torque. This rig is for towing.

I admire your attitude, initiative, and desire to "build" something as opposed to just assembling things. It's an art that seems to be lost anymore.

i do this stuff everyday. unfortunately, its always been putting money in other peoples pockets. kinda tired of it. even it this doesnt work, the experience is enough for me. eventually Ill do something people will pay for.

 

[c1500deathtrap]

I look forward to seeing how you work this all out. And no I was not referring to electrical current.