Throttle bodies

Just needs to be big enough really....have you measured the 1.3vvt yet?

11/60 wrote: After reading all the recent threads on people swapping the m13 to m16 and the evident need to get a 50mm throttle body this raises a fairly obvious question, is there any benefit from putting a 50 on a m13, assuming that the vvt isn't 50mm already? More bigger, more better, right?

I doubt if there would be any significant improvement, 45mm should flow enough air for a stock 1.3 although its a little small for a 1.6. The simplest test is to run flat out and measure the manifold pressure, if its lower than the baro reading then there is a restriction. peak airflow is at peak torque so you need to fully load the engine at around 3500rpm. Then you would need to determine if the restriction is in the air intake, the throttle body, the manifold or the head.
My Jimny is relegated to field duties so I can't test that, I might try it in the Ignis though.

Keithy wrote: Just needs to be big enough really....have you measured the 1.3vvt yet?

1.3VVT = 46mm
1.6 2004 liana = 50mm.

Jimny manifold will take either, inlet hole on it is the same size on both (which is why i thought they were the same).

Is there any difference in the idle control part of it? mines not idling the same after swapping the throttle body, and had a splutter session the other day as well.

Riccy

my 08 Liana M16A vvt (plastic intake manifold) had 46mm throttle body.
But have i measured the wrong end of it? this is on the engine side, the smallest diameter.

On the aussie forum someone said to use the Jimny idle thing (valve?).

I used the Jimny ICV as the liana one had different pipework and was seized.

Yakuza, there are four manifold runners and one inlet...hth

My manifold inlet was 46mm Riccy...I enlarged it to 50....got some higher revs afterwards.

Keithy: The manifold on the 08 Liana was 50mm on the TB-side, but throttle body on the intake side was was 46mm.
bigger towards air filter side.
Hope to have explained it better now?
Can post pics if you like.

We are actually discussing very small differences on engine details of Top Gears "reasonably priced car"..
It's not like any of us will notice how the sorroundings go blurry when we we press the accelerator and go into warp speed
But i Love it!

yakuza wrote: Keithy: The manifold on the 08 Liana was 50mm on the TB-side, but throttle body on the intake side was was 46mm.
bigger towards air filter side.
Hope to have explained it better now?
Can post pics if you like.

We are actually discussing very small differences on engine details of Top Gears "reasonably priced car"..
It's not like any of us will notice how the sorroundings go blurry when we we press the accelerator and go into warp speed
But i Love it!

So you have a 46mm throttle body mated to a 50mm inlet?

Might get a set of 38mm throttle bodies and rid mine of the nasty inlet manifold altogether.

The scenery had better go blurry after shelling out for 9.0:1 pistons and 500hp conrods to withstand the turbo.....

I ran a test in the Ignis (1.5) and had no trouble hitting the baro reading so no restriction there and the air filter (OEM) hasn't been changed for at least 20k.

yakuza wrote: We are actually discussing very small differences on engine details of Top Gears "reasonably priced car"..

The Swift Sport engine has around 30% more power than the "reasonably priced car" and around 50% more power than a Jimny so it would be no real surprise if the Jimny's intake and exhaust system were holding back a significant amount of power.