Rs4Racer

Hey guys Im looking at building up a fi system for the 13b that will go into my car, this is what im thinking so far.

Weber One piece wrap over intake manifold. DCOE
$250


TWM 2900 Series throttle Body 45mm DCOE
2900-4502


Rail kit for dual set up at center-to-center distances of 83-105 mm 2900-5801
$149.95

Fuel pressure regulator ???
I dont know which one...

Since I plan on running air filters. Could I/ should I use air horns?

On a Street Ported engine do you think this setup would yeild more power? Would I rather go 48mm?
(turbo block with n/a rotors in it. is this possible?)

How big of injectors will I need? (I'll only be running 2)

I dont know about you guys but this system will be alot cleaner than stock. (I will have to use a haltec or similar also)

On the Weber manifold it doesnt look like it has the oil injector holes in it, Does it? or will I have to run 2-stroke? I plan on running 2-stroke but getting a different pump and having a resivior to hold the 2-stroke. (Ive seen the units)

Do I need anything else and or Is there a better setup?

ponykiller

How about just running 2 oil injectors at a higher flow? There are two injection points on the block, and two on the LIM, right?
have you considered premix? It makes engine internals sooooo much cleaner.

good luck,
Kris

tweaked

iTrader: (4)

I sencerly hope that you can get that to work with good gains.
Be sure you keep us updated.

NZConvertible

Why sidedraft and why only 45mm? One of the many advantages of EFI over carbs is you can run a much bigger TB, because you don't need high velocity above the throttles for the chokes to work properly. How about this 2x50mm IDA -style downdraft TB instead? It's a less restrictive set-up than the sidedraft one.



It's from Injection Perfection in Australia. They do a kit that includes the TB above, an IDA manifold, all required fuel hardware (pump, rail, reg, etc) and a Microtech ECU for A$3,052 (~US$1,700). You only have to buy the bits you need so it'll probably be less. Go here for the complete list with costs.
This set-up will leave any carb for dead... Definitely. Air horns (or ram tubes) are a necessity to ensure smooth airflow into the throat. Not using them causes a significant restriction. Ideally they should be at least as high as the throat diameter, and the clearance from the top of the tubes to the filter lid should be the same distance again. The ram tubes shown above come with the TB. Absolutely! Yes. Why only two? Most aftermarket Weber-style TB's have four injector bungs. Just use the four 460cc/min injectors you've already got. They'll flow enough for ~250hp, which a street port will never get near. I hope you're not doing this just for looks... Yep, the stock ECU won't run this set-up. The Microtech mentioned above is cheaper but personally I think the Haltech's better. Buy whatever you can afford.
Good luck, hope it all goes well.

Rs4Racer

The TB that are in my post only have bungs for 2 injectors. So thats why only 2.

What is wrong with Side Draft?

Also I wasnt sure about the size of the Throttle bodies becouse I read somewhere that you want to keep a good velocity or something and bigger TB's will lower the velocity and power.

I dont know about the Injection Perfection unit but the TWM unit comes in 40, 42, 45, 48, 50 and 55 mm, and I know it will bolt up to the weber manifold.

Do you know if that IP unit will?

Im not just doing it to make everything look clean, I want everything to be simplified(easier to work on) And I do believe that the new manifold and TB setup will bring alot of performance and efficeincy to the engine.

rotarygod

iTrader: (1)

I have that manifold. I'm not going to use it either so if you want it let me know. It needed alot of cleaning up since the castings were very rough. It can accept at least up to a 55 mm throttle body setup. The intake holes are huge. I was going to use it as a project but I have so many and can't do them all.

I agree with NZConvertible. Use ram stacks. They are still doing their job whether they are tucked under airfilters or not.

Rs4Racer

I just came across this manifold from TWM.

Its straight thru and quad TB.. Whats your guys take on this?

NZConvertible

Fair enough. It does make injector sizing a bit more restrictive though. A pair of '85 GSL-SE 720cc/min injectors are only big enough for ~200hp. An induction system like this like, combined with a big street port and a good exhaust has the potention for a lot more than this (220-230hp) if well tuned. Four stock FC NA injectors will give you a lot more headroom, plus will a Haltech or similar you could stage them (like the stock ECU does) for better idle and low-load running that two large injectors. The longer runners with more bends will limit top-end power over the IDA set-up, although it'll probably make a little more torque. It'll take up less room too. That's carb theory. With the injectors mounted where they are (high in the inlet tract), adequate air/fuel mixing will take place in the runner, and since the actual intake ports are still the same size, port velocity is the same. A 50mm TB is a lot less restrictve that a 45mm one, so power potential is improved. There'd be no need to go any bigger unless you went to a bridge or peripheral port. IP use Weber bolt patterns too (like most aftermarket EFI stuff) so it'll fit. Hell yeah! Ooh, I like that one! That'd be the ultimate 4-port NA set-up for power (at the expense of a some torque), but I think you might have trouble squeezing the manifold, TB's and air cleaners between the engine and the strut tower. Measure before you buy...