ITBs that might work

[Sporno]

so an intake manifold from a B18A1 can fit why cant ITBs for a B18A1 fit?

[AccordEpicenter]

they can be made to fit. Problem is they are soo damn expensive and a20s dont make much power NA anyway

[Vanilla Sky]

yeah, those kits are like $2000 for JUST the manifold/ITBs. the electronics are another $1000 at least. it's not something that you would undertake on a 3gee with teh old A20 still installed.

[ex1z7]

Are you guys talking about aftermarket throttle bodies for B18's after you use a B18 intake manifold for the A20A3/4 ?

And uhm, I thought people were using Mustang throttle bodies cus they're so cheap and they work great?

.. I'm sort've behind right now :x

[A20A1]

No there are things like TODA racing, REDLINE WEBER. ITB's and manifold's

The REDLINE has a complete kit with everything

I think TODA just has the ITB's and manifold.

Both are really expensive.

[Sporno]

are they worth it im interested in this kit.

[A20A1]

Thats up to you.
I mean if you can find someone or yourself to peice together and ITB kit rather then buy a premade one then you may save some money and have a setup that it built towards your engine diplacement and powerband.

Not to say you can't hack up an ITB manifold and fiddle with runner lentgths or add on air horns to a premade kit ITB setup.

I think the only trouble with the kit will be working out an ignition system to work with the programmable ecu they offer, that way it controls the timing.

[Sporno]

ya that seems like the hard part.. although i kinda had an idea about making some . the one of the intake manifolds had secondary throttle plate kinda thing , if i could get thouse by them selves then hack offthe plenum of the stock mani after the fuel rail and slap on the throttle plates and put on some and get some velocity stacks. it would take some serious welding, but it might work

[A20A1]

The throttle plates for the secondaries in the EFI manifold are not as precise as regular TB plates.

[Sporno]

ohh well its an idea

[Legend_master]

You can make your own ITB's with your factory manifold, I can have them made for $800.00 + the manifold and Bike throttlebodies.

[HondaBoy]

that sounds like a plan right there. using a stock manifold runner, cut off and add flanges to adapt whatever ITB or carbs you'd want. i may try that myself. but just have the insides of the runners opened up some and smoothed out. that might be something to think about if you're gonna modifiy a stock part.

[Legend_master]

that sounds like a plan right there. using a stock manifold runner, cut off and add flanges to adapt whatever ITB or carbs you'd want. i may try that myself. but just have the insides of the runners opened up some and smoothed out. that might be something to think about if you're gonna modifiy a stock part.

I think the hardest parts would be messing with the TPS and tuning the SOB.

[b8er]

thats exactly what im doing guys, i have a stock manifold thats in about 8 peices and im working it to adapt my itbs off of a 03 cbr 954rr, tps isnt a problem as the tps sensors are exactly the same, yes thats right, the plug into each other no problem, also the fuel hose that connects to the fuel rail are both the same between the itbs and the a20

[Legend_master]

thats exactly what im doing guys, i have a stock manifold thats in about 8 peices and im working it to adapt my itbs off of a 03 cbr 954rr, tps isnt a problem as the tps sensors are exactly the same, yes thats right, the plug into each other no problem, also the fuel hose that connects to the fuel rail are both the same between the itbs and the a20


how do you plan to tune the car?

[b8er]

havent gotten that far yet, ahaha, workin the manifold righ tnow but i cut the manifold just long enought to still use the stock injectors so if i run into a problem with them on the car i can just switch it over to the stock fuel system and then tyr to fix the problem, well at least thats my plan

[Sporno]

well i did some searching and found another guy had this idea and it was shot down.

[A20A1]

Don't be discouraged though.

[Sporno]

the 89 intake manifold had secondary buttryflies and i know it would fit and if i did do it , what would i do with the coolant line an all the vaccum lines . i could get one of the golden eagle vaccum jobbies. and all that stuff on the intake manifold

[b8er]

well i did some searching and found another guy had this idea and it was shot down.

was this directed to me?

[Sporno]

ya , y did you do it

[b8er]

why did i do what? im not done the project yet, with work an race season here i only have so much time to continue building the manifold

[Versanick]

save your $2000 toward a turbo setup. you'll thank me later.

[b8er]

save your $2000 toward a turbo setup. you'll thank me later.

i dont think your the first person to sugest and turbo setup, with everything said and done i should be into the itbs for about 500 bucks

[rjudgey]

Turbos this turbo's that hey maybe the guy's trying to be different!! Yeah Turbos are great chucking in loads of air just turn up the boost and add more fuel, chew up a few tranny's and clutches in the mean time, can't go round corners cause the boost kicks in and you end up going straight into the barrier, yeah great, also where's the lovely noise, whoosh bang suck hmmm rather have the open roar of 4 ITB's sucking in as much air as they can chuck out the engine thanks. The soundtrack on an engine with twin Webers or ITB's is to die for and if anything else is worth putting on for that alone even if it only gives you 10bhp more!!
If you want a drag car you need a turbo but if you want autocross or track race stick with N/A and use ITB's or twin Webers yes theres more hardword involved as you need to have quality headwork, cams, good exhuast header and system, higher CR ratio's but with all that in place 200-230bhp is possible even more with a B20A 230-250bhp without having to spend money like a formula one team yes it might not be as cheap as a turbo but when it's all done you could allways slap on a turbo afterwards!!

[b8er]

i was waiting for rjudgeys reply to that, im with yea dude, i wanna try somthing a lil different then everybody else so i figured why the hell not itb's, we will see how it works out

[Immeraufdemhund]

is the cbr Fuel injected? if it is then i dont see a problem putting it on a 3g. But if it's actually just a carb then your gonna have some problems. If you could get an adjustably fuel pressure regulator then you could just set it to like 2psi. I was also thinking that since the drip hose just gets fed from the pet cock then you could just make your own fuel rail for this. Get you like 3/4" copper and 3/8 tubbing and solder those together (probably seal fause them) and hook up your hoses accordingly.

for your adapter i'd go to a local fab shop have drawn up the face of your manifold and the face of your ITB and tell them to make it. Make it outa stainless or aluminium. that should get you going.

[rjudgey]

Bike carbs will work as well theres a lot of cars in U.K. running with bike carbs the only downside is that the inlet manifolds have to be offset a little as the bore spacing the on bike carbs adn ITB's tend to be a bit smaller than 90mm you can have them modded to be 90mm but at great cost and less realiability. The Bike carbs are generally more reliable than Webers and have better low end response which makes them easier to drive, they are also tuneable and Mikunis even use Weber jets!! They also come from any sizes from 36mm chokes to 42mm and some of the race ones can go upto 50-55mm each. A lot of good results have been had with these setups and most the time the bike carbs can be bought for as little as £100 but in U.K. theres a lot of middle aged men going through mid life crisis that buy a big sports bike and then end up crashing them!! So plenty of spares here!! In. U.S. tend to be more Harleys than Jap sports bikes so harder to find.

[b8er]

well the itb's ( indivual throttle bodies) i got are fuel injected, so i wont have to make a fuel rail or anything, plus the fuel hose attached to the itb fuel rail is EXACTLY the same as the rubber hose attached to the fuel rail on the a20. so theres no problem there either

[Ichiban]

I know this is stupid and defeats the purpose, but could you run each throttle body to a common air filter and just before that the stock MAF coil? You could retain the stock ecu that way. I wonder if anyone could build a MAP sensor that would proportionally simulate the signal of the MAF sensor under similar conditions. Is this possible? Is it stupid? I'd be nice to have a plug and play MAP sensor for the stock ECU though.

BTW my BT-1 never had EGR, the castings are there on the intake and exhaust but were never drilled out. Is this good or bad?

[rjudgey]

good for power and engine bad for emissions and the planet.

[Ichiban]

What?

Correct me if I'm wrong, but there is a Mass Air Flow coil in the intake somewhere?

[Ichiban]

Isn't that (a MAP sensor) better than trying to calculate the air flow by how much current it takes to maintain a heated coil at a certain temperature, based on the displacement of the engine, cross-sectional area of the intake, ambient air temp and humidity? You should be able to plumb the MAP sensor into the ITB's so you can get a comparable measurement, right?

If you can find a suitable source for the MAP reading, why do you need aftermarket management, I mean it'd be nice, just not required