I'm buildin an LS/VTEC and i wanna go individual throttle bodies, but my friend said that it does away with power brakes and that its really only for strictly race cars or cars that see a lot more track time then street, howver, my car is gonna be daily drivin for a lil while until i buy another car, but i dont care for creature comforts since i dont even have a sterio system in my car i just want a all out street drivin race car but i do want good brakin so if any one can help with this let me know.

 

It does not take away from the power brakes. You have a vaccum canaster. look around at ITB setups. You''ll see some in plain site. Thy have like 6-7 holes going into the vaccum canaster

 

it's true what he said, in ITB you got less vacuum than a plenum ... but it's not dangerous to go on the road

 

itb's do pull a lot less vaccuum; not up to the point of your brake booster not working. brakes work fine.
they are also by every mean completely streetable, been running them everyday for about a year now.

 

I daily drove mine, and it made tons of vacuum. I made a cheapie vacuum manifold for it and an adapter plate for my IACV, no problems. Throttle response was amazing.


The vacuum manifold (1' of 1" pipe, capped and tapped for 1/8" NPT hose barbs):




IACV Adapter:

 

More pics of that whole setup:


http://s115271005.onlinehome.us/TWM/windex.htm

http://s115271005.onlinehome.u...2.htm

http://s115271005.onlinehome.u...Pics/

 

i did a good vacuum manifold and i measured it, i don't remember how it was but it less than a plenum
So rmc check with a gauge you will see

 

http://s95.photobucket.com/albums/l160/Cr4ck0z/
that's mine, with a 2 1/2 piping and the vacuum is less than a normal plenum and it's normal with 4 invididual throttle body ...

 

i don't have any loose of vacuum in my system too, and the gauge shows less than normal vacuum you must have in a normal system ... it's 18 hg the normal if i remember exactly

 

I drove it for 6 months, showed 20 on the vacuum gauge.

 

Yeah im getting about 330 mbar at idle also; as for the map sensor, you would want to use a very small vaccuum canister, just small enough to dampen pulses to make readings a little smoother.
try to make vaccuum lines as short as possible

 

hm .... small or not the vacuum is the same everywhere ...

 

it will not change if ur line is small or big

 

reading is the same. its about volume; there is no need to overdue it..
put your finger over a 1/8 line and gas it; now put your hand over a throttle body and gas it, same vaccuum not same effect...( dis. dont do that or your hand might not like it..)


have tried with a bunch of different vaccuum setups, and as for now i stuck to this:

 

I just used the G-E. Ran 4 lines to ITB, 1 to map and other to FPR. Final Large one is for the Brake booster.

 

yeah i got that too on mine (IAC, brake booster, canister) go from a 2 1/4" pipe to a small 1/2" vacuum line .. maybe it's my butterfly that loose a little bit, my idle run very nice but maybe it loose there, i did my own butterfly so it's maybe not perfect at 100%

 

have you synch'ed the throttle bodies?

 

what do you mean ?
They are adjustable so yes i do if its that you mean,

 

is it possible to tune twm itbs on 91oct ~11.0CR cp pistons~?

 

why wouldnt you? i run 91 oct with 12:1 compression. motor has been finished for about a month and ive driven it every day . going to tune thursday.

the 2000 series itb's have a booster vac line , but i tapped each runner for map signal. i pull great vacuum and the brakes work incredible.

 

I ran 93 octane with 12:1 pistons, so I don't see why not:

 

will i be able 2 run my original p72 ECU/PCM in order 2 break in the motor before i tune it on dyno? i don't care if i have shity idle as long as its drivable.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PACMAN8 &raquo;</TD></TR><TR><TD CLASS="quote">will i be able 2 run my original p72 ECU/PCM in order 2 break in the motor before i tune it on dyno? i don't care if i have shity idle as long as its drivable.</TD></TR></TABLE>

no way... shitty idle is an understatement

 

you will run too rich ... not good for the motor ...

 

yeh, stock ecu is not good to break in a motor if u have major upgrades, your better off breaking it in on the dyno or get a good wideband street tune to break it in