ITB + manifold build

Hello, after recently seeing 150 ATW's on R1 carbs i decided to get exact fueling (and the sound) so i wanted to fit throttle bodies!

So speaking to a local genius engine builder/tuner Sandy Brown about which to go for,
i ended up buying GSXR 1000 bodies which i could space out. I'm not using silicone/truck hose to join the bodies to the manifold but an O ring to seal and brackets to hold to the manifold. apprently this doesn't absorb any resonance and can produce better results.
Everything i've made myself and welded etc. I'm not trained in TIG welding at all by the way!





As you can see (third pic up) the ovalisation of the tubes has distorted the tube on the other end but i'll mill this flat before i continue with the next step. and yes i haven't finished welding!

 

few more pics, finished welding the tubes on, test mounted on a head.

 

Tidy! I assume you've checked for clearance, at the height the outer end of the ITB will be at?

 

ye might hit the bonnet with mega trumpet-ay's. :-(

 

Rocco with bonnet cut out for trumpets !

Already been done lol

Bargate's Mad Max Rocco

 

nice bit of welding there. Where is the o ring going to sit with regards to mounting the bodies. Are they going to slide onto the end of the manifold or just sit against?

 

Some pictures of recent progress, modified the fuel rain abit, loats of machining work on the manifold. have yet to turn the O-Ring groove for the seal on the bodies (im making the current groove abit deeper), but you can see how they all fit together nicely.






good eh!?

 

Looking good there.
Will there be any support for the ITBs?
They will need to be held in place, and also the air filters or air box will be acting on the o ring grooves too.

 

Great job!
The welding looks sweet too.

 

I'll make some brackets to hold em in place, you couldn't just leave them how they are, the vibrations would damage them as they'd wiggle loose.
I'll have huge trumpets and avoiding an airbox/air filters untill i have some time to make one, maybe...

Cheers, i thought they looked pretty cool, will try and make o rings fit tonight.

 

thats handy having a cnc mill to hand.. nice one

 

Really nice bit of welding

 

From past experience running simmilar set up i can advise you to make use of redundant injector holes on bodies it self

Instead of blanking them off i'v linked them or should i say plumbed them together and use them as take off for vacum

Also having common vacum rail accross all four they were self balancing for perfect idle

Nice work by the way!

 

So it could be mapped on MAP and TPS?
Joining the individual-ness surely is defying the point of having individual throttle bodies?
Did you do it purely for idle smoothy-ness?

 

They were joint by 6mm ID tubes, not spoilt individual-ness at all

Used it primarily for Vacum take off for brake servo, idle smoothness was a bonus

 

I would disagree with this comment, If you link them you are effectively turning the manifold into a plenum chamber not optimised in volume for the setup, the flow of the individual bodies will then be disrupted by the cylinders on a different stroke as the air pulses through the engine and manifold, therefore you are not extracting the most from the setup and are not gaining as much over a plenum (if at all) which has been designed to pulse and has the correct volume to do so.

 

There would be to much pulsing through new plenum for a MAP sensor to work. TPS or nothing.

 

Not going into technical detail wether it was wrong or not as to be honest i am not mega clued up how itb-s work

Proof in puding was standard 9a, mildly p/p head, Kr cams with my ITB set up made 176 Bhp ATF and 160-ish lb/ft torque, drivability was exellent

And a very good tuner/rolling road operator who was mapping my set up never said anything about vacume rail spoiling things and he knows his stuff thats for sure

Can i also mention that i was running 50 Oem Citroen Xantia Magneti Mareli Ecu, mapped by said specialist above working of throttle angle, i belive term is Alpha-N or something like that

 

Same pudding as a certain standard ABF on SEM. Does not cut much with me if as you say the mapper was extracting every little drop.

But thats my opinion, above was a mere fact about turning it into a plenum, the effect? who can say for sure? Would be interesting to see if there are any comparisons out there.

Good skills on sourcing the ECU, i remember reading your thread with great interest.

 

Hope we not going off topic here and appologies for hijacking

i am sure i have seen some people linking Jenvey bodies in simmilar fashion for vacum take offs, anyone?

Also i dont think that 6mm tubink has any great effect on turning it into plenum at anything other then idle and very slight part throttle, just think its insignificant on wide throttle openings

just my 2p, but then again like you said no direct comparison so who knows ey