ITB's for 3vz

[sketchy]

was looking around too see what the deal was...as I now have some 4age black top ITB's in my possesion:P

found this guys write up....
http://www.homemadeturbo.com/tech_projects/itb/
that almost looks too easy:)....
admittedly we are working with 2 banks of 3,not 1 bank of 4...so the throttle linkage will be a bit of an issue...and brake booster vacume may be a pain...

but...looks like the way I should go:)....anyone reckon it's a bad way?

and no its not for the limo:P

[Whore of Babylon]

Ive been looking at doing this as an idea for months, looks like you have gotten further than me.

[rev king]

I am also working on Itb's using the lower from the 5vzfe. I will have these on my 3vzfe in a couple of weeks with a manifold because I am turbo charging mine.

[frisp]

Sounds promising guys. Would love to see one of these completed and a fannymold protoyped :D

[sketchy]

Im gonna prototype them

was just gonna start with the flanges off the lower manifold and build up too the throttle bodies, and build some pipework too complete the water jackets...

if they work ok...Ill probably do a production run of them:)
like the exhaust headers Im thinking about doing also;)....

[frisp]

Nice to know, I'll be watching :)

[rattymr2]

If anyone is considering bike throttle bodies Triumph bikes are triples.

[TbarTurbo]

Somebody suggested triumph triples wouldnt be suitable?

Sketchy sounds like your thinking along the same lines as me with manifold design, i was planning on relocating the filler to the gearbox end also as there will be a lot more room available there, and to make it in such a way all bolt original parts needed are bolt on...

[Limeymk1]

Triumphs would be good but they are rather large beasties, so will take up almost twice the space as the GSXR600 type ITB. 'Tis the reason I can't use the sets that I have. :(

[sketchy]

black top throttles are about the smallest you would be able too get away with(even then possibly a little small...not broken out the measuring devices as yet....)...if you match port area, too ID of the throttle body...unless the triumph has a throat about the same size(could you flow enough for a 500cc cylinder through a single one?)

as for making space...your really only worried about the TPS as the accelerator is in the middle of the 4 normally(and if both banks are tied together well...you only need one TPS;)...and looks like I could run that at the gearbox end anyway)

[biteme]

Would Tony's flow machine be able to give us an idea of the optimum size for some ITBs?

[Limeymk1]

Sorry should have been clearer, the Triumphs are about right as far as the bore goes (40mm ish) it's just their physical bulk that's the issue. They're just a bit tall and a bit fat. Lol

As to optimum size it all depends on what you want from the engine, I met a guy who was running his 4.0 V8 on 28mm ITBs and he was very happy with it.

[BSM]

Why not three sets of twin throttle bodies? I've got a TL1000R and they are not that big....

Also in a V formation already?

[cartledge_uk]

Would Tony's flow machine be able to give us an idea of the optimum size for some ITBs?


quoted from jenvy

Up to 30 BHP/CYLINDER - 30mm
up to 33 BHP/CYLINDER - 32mm
up to 39 BHP/CYLINDER - 35mm
up to 46 BHP/CYLINDER - 38mm
up to 51 BHP/CYLINDER - 40mm
up to 56 BHP/CYLINDER - 42mm
Up to 65 BHP/CYLINDER - 45mm
up to 74 BHP/CYLINDER - 48mm
up to 80 BHP/CYLINDER - 50mm
up to 87 BHP/CYLINDER - 52mm
up to 93 BHP/CYLINDER - 54mm

:thumbsup:

[sketchy]

so if we said the 3vz was a 200BHP motor...thats a 32mm TB set up

are there any disadvantages for them being too big then?
other than space issues?

[cartledge_uk]

so if we said the 3vz was a 200BHP motor...thats a 32mm TB set up

are there any disadvantages for them being too big then?
other than space issues?

Too big and you lose air velocity (like toyota did with the first 4age, and added Tvis to compensate), to small and you choke it.

I wouldnt go 32 on the v6, 32 is the maximum of 33bhp per cylinder, so bordline choking

i'd go with 35mm, and depending on future mods (port polish/manifolds/cams) if you even think you'll get near 250, then go with 39's.

[sketchy]

so what did they do too the 20 valves that warrented running a 48mm one on the black tops?

[Conor]

^^^ Three intake valves per cylinder, perhaps? Just guessing.

Sounds like a fun project for someone with a TIG welder..

[aw11man]

im pretty sure the 'trd' itbs for the beams 3sge are the same size/design as the blacktop 20 valve, makes you wonder why they where so big

[Whore of Babylon]

Someone should get brutal on these

http://cgi.ebay.com/ebaymotors/Porsche-911-Intake-Stacks-and-Throttle-Bodies-2-4T_W0QQcmdZViewItemQQcategoryZ33558QQihZ014QQitemZ 330232487319QQrdZ1QQsspagenameZWDVW

Would they work?

[sketchy]

they would work...still have too sort injection and linkages...no reason you couldnt if you were prepared too have a go;)

[sketchy]

now after cleaning out the shed...(got rid of all that interior stuff we pulled out of Bretts derby car)...was trying too decide what I should do next...

kinda decided I needed too break stuff:)
http://www.twobrutal.co.uk/forum/images/recovered/2008/05/52.jpg
figured I could just cut out the majority of it with the saber saw....and flycut the rest;)...and just tig the new pipe work to the old flanges....

and its not like I dont have spares of those either;)

[OlberJ]

Get in there, that's work that we need to see :thumbsup:

[sketchy]

well finished hacking it apart....

dont think I can trim much more out of it really....
http://www.twobrutal.co.uk/forum/images/recovered/2008/05/66.jpg

after putting the fuel rails back on...I think the straight tubes between the head and the throttle bodies is gonna need too be about 160mm long...so they clear the fuel rails...means that the top of the throttle bodies for the rear bank will be about 50mm higher than the plastic trim
http://www.twobrutal.co.uk/forum/images/recovered/2008/05/67.jpg

[NZ84vvt]

so what did they do too the 20 valves that warrented running a 48mm one on the black tops?

I think that they are " about " 45 at the butterfly
tapering out to 48 at the intake
way to big for the 1.6 BT