throttle body

[skye00]

can someone please advise me what is the best aftermarket throttle body and inlet mainifold or is there parts off other cars that will mod my 01 saxo vtr mk2? :y:

[fossie]

Think theres someone on here that ports and polishes them, im sure when he sees this thread he will post.
Failing that try a search and im sure you will find what you are looking for

[Mr_suv]

106 rallye inlet manifold (alloy one il find you a link to one)
edit:http://img.photobucket.com/albums/v353/nellys106/106%20Re-Build/FDM061.jpg
hope it helps you mate add that with a ported and polished body thingy someone does those for 35 quid on here i thinks

[AXracing]

Rally inlet do NOT fit late VTRs.

[piggy123]

i can port and polish your throttle body if you want!

[skye00]

how much?

[KamRacing]

porting and polishing is pointless unless a larger throttleplate is fitted. Fitting a larger throttlebody will slow the induction air at low revs which is not ideal for low revs.

[ts1]

i put a 106 rallye throttle body on my vtr.. i didnt relise the differance, if i had another one though i would probly do it again

[spencer_cammedvts]

i can do the work for you. its not pointless at all and you will see gains from it especially in throttle response and rev pickup.

[Mark51]

how much do you charge again spencer?
return basis?

[Evolution4589]

£26 isn't it..?

[Mark51]

^^ is that on an exchange basis?

are they gas flowed?

[spencer_cammedvts]

i dont keep them in stock or anything lads. you send me your throttlebody and ill do the work on it for you. yes its £26 including postage back to you. if you want Special Delivery postage its £30 all in

[Mark51]

hmmmm, if i can borrow one from someone else then i'll do it.

[spencer_cammedvts]

Im not sure someone else will have one spare lol

[manc]

hmmmm, if i can borrow one from someone else then i'll do it.

I have one for sale if thats any use to you...

ManC

[don55]

porting and polishing is pointless unless a larger throttleplate is fitted. Fitting a larger throttlebody will slow the induction air at low revs which is not ideal for low revs.

yup, listen to him, he shoould know a little more about engine tuning that a chap with a die grinder and some sand paper (no offence spenc)

but has anyone had one of these flowed, had it on a dyno, on the same day, same temp and seen a bhp increase, id like to see results if so(in all seriousness) simply making things bigger will not increase performance, its jsut not that simple.

[spencer_cammedvts]

i know its not just about making things bigger. but you cant argue and say it does nothing unless you put a bigger throttle plate in.

when you gasflow a head you get gains and you havnt made the valves any bigger! yer obviously you get better gains with a big valve head but its the same concept... you can gasflow a throttlebody and get gains without making "the door" any bigger.

right?

[don55]

yes but your not gas flowing, as you stated.

polishing is not good either, you need a slightly rough surface, gives better flow over a smooth surface, that tends to make the air stick to it.

[spencer_cammedvts]

and why am i not gasflowing? if you know your stuff you would know that air alone passes quicker over a mirrored surface than a rough surface. its only when mixed with a liquid that your surface needs to be rough which is why inlet ports on a head are rough and the exhaust ports are mirrored. petrol on an injection car is added to the intake air at the cylender head, not at the start of the inlet mani as on a carbed car.

like i say i know what im doing and am not a "kid with a dremmel and some whet and dry"

[vtrlogan]

but has anyone had one of these flowed, had it on a dyno, on the same day, same temp and seen a bhp increase, id like to see results if so(in all seriousness) simply making things bigger will not increase performance, its jsut not that simple.

Yeh, Spencer done mine, i had it on a dyno with standard intake and a race land intake, on my vtr and it run 93.4 on standard intake with panel filter and dead 94 with raceland, was running around 1.3 lower with out the ported and polished throttle body.


i noticed a difference when i fitted mine straight away, also there was about 10 people who swear bye them, how is giving some thing a better airflow not any good?

[don55]

Just been reading through this thread, i'm a friend of don55's.

I'm currently building a 1200bhp skyline with a hell of lot of experience under my belt, not trying to blow my own trumpet but just gives you an insight as to who i am.

Basically to get the maximum result as far as air flow goes, you need to polish to a mirror finish the exhaust side due to the fact you want the exhaust gas to expell quickly out of the chamber,

on the inlet side, if you are porting it, (to the same size as the gaskets), you need to leave the surfaces rough, by leaving the surfaces rough you are causing the air to be more turbulent, resulting in a much better burn thus giving more power.

If you polish the inlet side, you'll end up with the air and fuel being almost separate from each other and the car will run worse than it did before.

Hope this helps clear up the issues.

[spencer_cammedvts]

If you polish the inlet side, you'll end up with the air and fuel being almost separate from each other and the car will run worse than it did before.

Hope this helps clear up the issues.

yes this basically backs up what i said! if the surface is rough on the inlet side after the fuel has been mixed it makes things worse but mirroring anything before that does not make anything worse, it can only make things better!

surely its not that hard to understand (no offense BTW)

[KamRacing]

i know its not just about making things bigger. but you cant argue and say it does nothing unless you put a bigger throttle plate in.

when you gasflow a head you get gains and you havnt made the valves any bigger! yer obviously you get better gains with a big valve head but its the same concept... you can gasflow a throttlebody and get gains without making "the door" any bigger.

right?

a big valve head will not always give gains. Its a tradeoff.
flowing a head is mostly about keeping the speed of the air as fast as possible. Material only really needs to be removed to get rid of imperfections and any ridges and sharp edges that interupt the flow to the cylinder. Also the port shape may be rubbish requiring more extensive work.
Boring it out so it is larger will slow the air and cause fuel to dropout. Big valves can often cause a loss of torque low down in the rev range but when the engine is at high revs may offer an advantage if the engine spec is correct. It really should never be considered a 'bolt-on' mod as if the headwork is not matched to the cam and bottom end spec you will not see the gains you were hoping for.