951's did not have 2.7's. 2.7's came in the newer 944's.

ALL 951 (944Turbo & TurboS) had 2.5's

The 2.5liter 8valve Turbo created more torque than the 3.0liter 16valve N/A on the S2's. The S2's motor is base concept of the 968's motor but without the forged internals and without the variocam system.

With 4k in parts, you can have a 350+rwhp bolt-on 951. check out www.lindseyracing.com . Those 3-8k 951's you're seeing are mostlikely the pre-1988 951's. Those have 217hp. The 88.5 and above are called Turbo S's, which make 247hp. Both cars have the same displacement, 2.5liter.



Someone said something about boosting the S2. Easier said than done, but when done, it is monsterous. The S2's 3.0 comes stock with a 10.9:1 compression. Very high for an N/A motor, but that's how S2's can give pre-88 951's a run for their money on road courses. The 951's have 217hp, while the S2 has 207hp. The 951 puts out more torque at around 240ish @ 3500rpm i think and the S2 is only at 208 @ 4000-4500rpm. But if you look at the S2's torque curve, it's very flat. There is a guy in australia right now that is slowly cranking his boost up on his S2. It's a completely stock S2 motor with 90k miles. Has a stand-alone, K26 turbo, 951/S2 hybrid intake manifold, 951 turbo plumbing, etc. and the car is over 400rwhp.....@ 10psi. 100% gain @ 10psi is good. Stock pistons have held up for 15k kilometers now he claims.

He has spent a little over 10grand. If you're really interested, he will give you his intake dimensions, his fuel mapping, timing curve, etc. if you ask and are serious.


With that said, a popular motor/head combo is a 3.0liter block mated with a 2.7liter 8valve head off of the newer 944's. Turbo'd 500+ realiable HP easy and daily driven.