KNONFS

iTrader: (14)

On the same note, an EFI carb style system WILL make more power than a similar mechanical one; is just too damn expensive!

orange

iTrader: (1)

Can you explain a bit more about this megasquirt? Where can you get them, have you any links?

peejay

You don't "get" one, you build it from components. You can get a components kit to make your life easier, though.

It's basically a reverse engineered GM style computer, with what has got to be the stupidest name ever.

bill Shurvinton

Where did you get that from. Its not a reverse engineered GM unit AT ALL.

And IMHO 'peejay' is just as stupid as 'Megasquirt'

peejay

The algorithms they use are practically the same as the way GM ECMs do it.

"peejay" is the phonetic spelling of my first two initials, while "MegaSquirt" sounds like a robotic sex toy from some campy 70's film. (Also, if my fuel injectors "squirted" I would either throw them away or send them off to be rebuilt)

nevarmore

Well theres only one way to find out, we'll have Megasquirt and PeeJay tune up my 12a and see who does it better. Then we'll install the MegaSquirt in a friends TII project and stuff PeeJay under the hood and have them both fire the injectors and see who does it better.

grantmac

I don't see how a megasquirt set-up could be any more than a good (Weber) carb set-up. With some fab skills I could make an individual throttlebody set-up (4 throttlebodies) for an Fc no problem, would even be cheap. I bet that I could do it for under $800, without the cost of the laptop or any dyno time. If you want to buy all the components and bolt them togather it will get plently expensive however.
Grant

peejay

The FC has the advantage of being fuel injected already. It already has the proper fuel pump, it comes with some honkin' big fuel injectors, and the wiring is already there.

All you'd *really* need to do would be to make the intake manifold (less than US$50 for parts, including making the fuel bungs/rail) get some JY throttle bodies (the aforementioned Ford truck throttle bodies would be sweet, and you'd only need two since they are two-barrel units), and then you just need your programmable computer. Heck, the stock computer would probably work just fine if you put an airbox over the ends of the throttle bodies so you could use the AFM, and adapted the Mazda TPS to the setup.

rotarygod

iTrader: (1)

If you still have an afm, there is zero point in changing the intake manifold design. It can't breathe through the afm.

grantmac

The Ford units are large enough to just use 1 from a 5.0L. I was actually refering to a set of GSXR600 throttlebodies, $50 on ebay with TPS and fuel-rail all day long. Then all you'd need to do was make a manfold "extender" for them to clamp onto (they go on with silicon hose clamp type things). This set-up would be fairly streetable and should produce a decent amout of power with the correct ECU. Doing any of this with the stock ECU and AFM would be beyond useless so I won't entertain that thought.
Grant

peejay

What size, though?

40-48mm are good for "individual" setups (four throttle plates), for only two throttle blades you'll want 48-up.

The '91 4.9 has 39mm throttle bores, FWIW, not 44mm.

grantmac

The 5.0L has 50mm and the 351 has larger again I believe although I have no solid numbers. The only problem I see is attaching airhorns to them, and also how well they flow compared to a nice shiny aftermarket throttlebody of the same size. The benefit of bike throttledoies is that they are manufactured to very high standards and flow very well for their size, mast 600cc bikes use 38mm.
Grant

karism

I dont entirely agree with your statement.

The BMW 7 series has got a HUGE AF meter.I`am referring to the 3.5 6 cylinder engine.They allso used the Bosch L-jet system.They work very well when swopped out for the stock one of the Rx7,the plate size is

HAve a look at the attached picture. It compares a Miata AF meter to that of a Rx7.
The 7 series has a much larger one than the Rx7