Jump to content
The mkiv Supra Owners Club

Upgrading OEM Throttle Body


Noz
 Share

Recommended Posts

Hows this? I have allays thought that intake and throttle size, only becomes a restriction when N/A, as soon as there is a positive pressure IE Boosted, the intake pipe/throttle body size is only a restriction when the boost/flow exceeds a certain amount.

 

IE pressurised can flow far more then non pressurised in the same pipe size/dia, before the size becomes a restriction.

Edited by Tricky-Ricky (see edit history)
Link to comment
Share on other sites

If the pressure isn't increased, but the bottle neck areas are increased, then surely flow will increase. Thus easier to hit bhp figures with the same psi.

 

Perhaps a tweak for boost controller would be more power, but perhaps someone want's to increase power without doing that route.

 

Surely the pressure test is a measure for the quality of the seal, and setting the standard to meet if machining it out.

Link to comment
Share on other sites

So got some material for a larger butterfly valve. As there isn't much material I expect I song be removing much material from the bore.

 

However. NA owners don't have access to any upgrades. So it'll be better than nothing.

 

How many NA owners have never changed anything? Most I expect.

 

Even 5hp overall with polished intake be better than nothing. I remember looking for plug and play mods for my own GE engine before I had a good job able to fund expensive boost.

Link to comment
Share on other sites

The frequency of stroker kits on NA engines shows how affordable they are sadly.

 

Shame there isn't an upgraded intake and throttle setup which works and gives NA owners a small option, even for low hp gains.

Link to comment
Share on other sites

So, finally got a jig made. Got the throttle body de assembled, going to give it a go next week regarding boring. Will be aiming for 2mm.

 

Be interesting to see how it works out on a Dyno.

 

Compared to boost, it's minor. But be great to just get a tiny bit more from the throttle body regarding flow, as NA owners don't have the funds for huge engine changes.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.