Does anybody know where I can find a bigger throttle body to fit original inlet manifold for STi5?

Any answers apriciated....

 

Enlarging from stock 60mm to 64mm will give you a 12.4% increased airflow. I've got both this and a port flowed and (per tract) matched inlet manifold to go on an ej25 I'm building.

Company in Oz did the work - A$300 for the thottle body alone from memory, but shipping and taxes to/from Oz gets steep

Richard

 

Thanx...

What are the details of the company you are talking about, so I can cintuct them?

 

Wow that is expensive, mine cost me $80.00NZD. Mine was done by a guy I know that does throttle body mods for many rally cars in New Zealand.

And what a massive difference to the performance.

 

I was going to add that any machine shop should be able to do the same if you're only after the throttle body enlargement It's just a matter of boring out the original casting a little and making a new throttle plate.

Richard

 

Adonis - email me, the address in your profile is duff

 

Hi!
No one has then tryied to use a 64mm throttle body?
I'm building a 500bhp engine, and 60mm can be a little bit restrictive.
I don't except big gains, something like 5/10bhp, but it's better than nothing.
More will be still better (70mm will be the right size for 500bhp), better with a redline of more than 8000rpm, but at small throttle openings will be less precise...
The stock 60mm can be quite easily bored out to get a 64mm trottle plate.