RB25DET Throttle Diameter

[Freebaggin]

Hi again,

I asked this question on SDU but not much luck, Zapf suggested 70mm but I dought it, it's smaller than that I'm sure. So does anyone know the inside diameter of the throttle (or the butterfly for that matter) on the RB25DETs?

Thx,

Freebaggin.

[Grim]

I don't know the dimensions...but does anyone know if it's possible (and easy) to increase the size and what's the best way to do this?

[meggala]

yes grim either a q45 throttle body 80 mm or an xf one

70mm is about right.

meggala

pull off the cross over pipe an measure it

[Freebaggin]

I know that guys upgrade their throttles to the XF version which is 65mm (Sub-zero 10.6 R33 for eg I think), so I'm sure the standard RB25DET is less than that ......or else they have gone backwards!

I'll have to measure it myself I suppose.

Freebaggin.

[Clint32]

The 32 which looks similar would be 60mm inside, the inlet bit is 70mm but the internal size would be 60.

[Cubes]

Does the Larger throttle body loose power and gain it up top or does it gain power all over?

But is it a worthwhile Mod?

[Clint32]

Allows more air to flow so it would be less of a restriction in top end, only needed for real big turbos i think when you can use 3'' cooler

[Merli]

Originally posted by meggala

yes grim either a q45 throttle body 80 mm or an xf one

70mm is about right.

meggala

pull off the cross over pipe an measure it

Actually the Q45 throttle body is generally referred to as a 90mm... But the internal diameter is really more like 85mm...

Definitely bigger than 80mm though!