TimeTrial car, need additional 5-10hp

[The Radium King]

how about a early 996 plenum w cable throttle body)

or this ...

https://www.ebay.com/itm/OBX-Individual-Throttle-Body-Fits-Watercooled-Porsche-911-Boxster-ITB/182223111819?epid=1986020481&hash=item2a6d58068b:g:mEkAAOSwbsBXmlXx

[thstone]

Originally Posted by The Radium King

how about a early 996 plenum w cable throttle body...

This is a good way to pick up 5-10hp.

[Boxstard]

Originally Posted by The Radium King

how about a early 996 plenum w cable throttle body)

or this ...

https://www.ebay.com/itm/OBX-Individual-Throttle-Body-Fits-Watercooled-Porsche-911-Boxster-ITB/182223111819?epid=1986020481&hash=item2a6d58068b:g:mEkAAOSwbsBXmlXx

I do have a 996 TB on pretty much stock 2.5 with UDP and PSE, like quick throttle response and do not feel loss of low end torque that some typically suggest. Maybe because 2.5 intake pass is larger for most part with only the throttle butterfly that chokes down as the bottle-neck? My intake is all original from snorkel down to holmheltz chamber and it sounds very nice and audible at quick throttle opening.

Anyway I'm wondering if someone did dyno before/ after to ducument the change?

Also the link showing individual throttle body like carb stack, what is that like? Again any documented dyno results?

[Lemming]

Back when I did TTB and GTS3 with NASA (924S with 3L) I was the lowest HP, but lightest car. Great in many respects but got killed on long straights (where it is easy to pass), by higher HP cars with the same power to weight.

996 TB is a good idea, but finding a good used mechanical unit is not easy and new ones are over $1,000. Have you considered having your TB bored? Not sure if you will get the 10 HP that you need, but you will get some extra HP for those long straights at VIR.

You straight that you have full exhaust, do you mean stock?

You can tune the car and expect to get a few more HP as well. I would stay away from a preset tune and get one done with the car on a dyno for best results.