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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,564
FYI: Garrett GT-BB equipped motor doesn't have to be laggy. We used twin GT35BB's on 3.6L IF2 car to push more power. That is already past optimum size, but car wasn't laggy at all.

It did take time to hit max boost (which it did fairly high) but due to Garret's nice compressor curves it started building boost quite early. Also, EFI is mapped to deliver boost proportional to TPS, so you never get the typical overshoot delivery.

Motor was dynoed to a tad over 1000HP (1030 or so, must check the dyno papers) on 2 bar of boost, using race fuel. That was before new intercoolers and plenums were in place, so I believe that it could be maxed at ~1100HP for bragging rights. 2 bar setting is unusable for anything else than dragstrip. Movie about the car has been released so I'm free to say the dyno #'s

Eventually, we found out that high head temps were it's achilles heel. You just cannot keep them cool enough and they weaken then crack.

For daily use, 1.2 bar is used netting around 600hp which works just fine in 1200kg car. Engine is toast now (spun bearing on the ring) so new one is being assembled.

A little trailer of the documentary:
http://www.youtube.com/watch?v=4pVlV8VYTLw

Honestly, if you want a 700hp streetable 911 engine you either have packets full of money or you are a wizard tech with lots of sponsors.
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Old 01-09-2007, 11:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)