Ported Throttle body question for ODB2 Golf VR6 2.8

[matth76 0]

Hi

 

I've heard there is some gain to be had by porting or increasing the butterfly on the throttle body for a golf vr6. I own a later odb2 golf vr6 2.8 and it currently has a standard throttle body.

 

I have heard there is someone called Mr Alpina who is a specialist with throttle bodies for the vr6. Does he have contact details? And is 68mm the maximum size butterfly that will fit my 2.8 throttle body or is there a maximum optimum size? And what difference to response / power will it make to my car (any increase in torque / bhp?) ?

 

How much does it cost to get a standard throttle body ported and have butterfly increased?

 

Thanks for any info.

 

Matt

[flusted 0]

Ive got his mobile number,phoned him last night,his name is ian

[Kevin Bacon 5]

You can't enlarge the throttle butterfly on OBD2, it's sealed for life. All you can do is take the step off the throat, but it won't be as effective as an enlarged butterfly.....

[alpina527 0]

Kev is correct. The OBD2 body is sealed for life, and can't be stripped. I can re machine for higher flow up to the butterfly, but it's not nearly as good as the OBD1 2.8 and 2.9 bodies that I do. They are fitted with a bigger butterfly and re machined for higher flow. They are NOT just polished.

 

Mail me on mailto:[email protected] for info

[Kevin Bacon 5]

Cheers Ian.

 

Myself and a few guys on here and the Golf forum are more than happy with your workmanship.

 

Shame about the OBD2 throttle tho :-(

[matth76 0]

Thanks Ian (Alpina527)

 

I'll send you an email.

 

Is a shame about the ODB2 one! Why did VW seal it??

 

Whats the general power gain with a ported and flowed throttle body (without bigger butterfly - as mine can't have that)?

 

Cheers.

[Kevin Bacon 5]

I spoke to Ian about the flowing the OBD2 throttle and he said there isn't much gain in doing it. It's the larger butterfly that gives the gains and as a guide, a 2.9 VR with a schrick, 268 cams and one of Ian's throttles usually sees around the 225hp mark on the dyno.

 

Sealed - probably so that they can charge us more for a replacement! It's something to do with the stepper motor I reckon, it's all intergral to the throttle.

 

As you've got an OBD2 2.8, it's probably putting out 195ish anyway as that management is a lot better than OBD1.