Lumbergs Lackey....MmmmKay

Will this work on a 944 S2? I have contemplated supercharging but I don't trust Huntley and I can't live without my AC. So this seems to be the best option.

mmmbeer

All 968 NA's had the same pistons. I don't know if the S2 pistons are forged, but all the same principles as in a 968 conversion aplly to the S2 as well. You just dont have the variocam and piston oil squirters. Maybe I forgot something, but that is the essential bits.

There is a Swede that has a 3.0 8V Turbo engine for sale, it is based on a S2 block and 951 head (velded water passages). 8:1 comp, K27 and comes with a complete 3" exhaust and race clutch. He wants the equivalent of $9000 for it. That is cheap compared to many other builders! I was close to buying it, but did not. His webpage is on swedish: www.sanden.nu

theedge

Damn, thats basically my dream 944 there, a Turbod 3L and all the extra good stuff.

Are you a mechanic or just a guy in his garage?

mmmbeer

Alternative B... Minus the garage unfortunately

Here is a pic of the work area...

theedge

Carport Mechanic then

Tom Carson

https://rennlist.com/forums/showthre...hreadid=105332

shows Kolbenschmidt 968 and Mahle 968 pistons...not the same

mmmbeer

Are you sure they are not aftermarket pistons? The PET show only one part# for all year models 968: 94410305800. Although the PET might be off due to updates or something...

Jay Wellwood

Have you taken the car to a dyno since conversion? The numbers would be very interesting.

With the much lower CR - it appears that you could easily run 1.5 bar of boost - but it is my understanding that the you are limiting the boost based on the engine management - what steps will you take to be able to run with higher boost levels???

Inquiring minds must know.........

mmmbeer

The OEM 968 management was kept just to check that the engine was working correct mechannically and to break it in. Since it worked so well at low boost I havent got around installing a proper management yet.

I am considering the Haltech E6K. Dynos will be posted when the car is tuned.

trebor_quitman

You mentioned earlier that you still have the vario cam in effect? What will you do when you get the new Engine management?

mmmbeer

Definately keep the variocam and play around with the activation rpm's to see what turns out best. Some tuners claim the Variocam is a disadvantage when boosted. But I am yet to see proof of this or even a good explaination why it would be bad. After reaserching how the Variocam works I canot see why it should not be used when boosted. I might ofcourse be proven wrong...

The myth is that the Variocam high rpm setting allows for more valve overlap which is bad when under boost. That is just not true the only difference the Variocam make is closing the intake a bit earlier below 1500rpm and over 5500 rpm. Which again results in the fact that the 1500-5500rpm range can have a very long intake period, instead of a compromise that have to work on the entire rpm range. That is why the Variocam allow for more power all over the rpm range. I cannot see why that should not be an advantage also when boosted. Please explain if someone do...

theedge

Are there engine management systems that support the variocam?

mmmbeer

The Variocam solenoid is activated by a simple signal. Any rpm switch could do it and most management system allow you to take out signals based on many factors, including rpm. No problem at all.

Jay Wellwood

AFter thinking about this for abit - I got to thinking, with reducing the displacement from 3.0 to 2.7 - in an effort to lower the compression to permit boost - what kinda trade off will you have? While it may be true that boost will provide a largert output, there is the old adage that there is no subsitute for displacement. I'm very curious as to the final dyno numbers.

mmmbeer

Short answer: Sacrifised low end torque. At midlle and high rpm the lost volume can be compensated with boost.

I had that in mind before the conversion, but that is really no problem since it is a race engine. For a street car I would have gone with a smaller and more advanced turbo too. I would take this 2.7 16V variocam over a similar 3.0L 8v any time of the day...