blade7

Just to add, I usually wouldn't rev much past 6k or run more than 16lbs boost, if a 3.0 using the LR 61 started pulling from just over 2k and made around 400 bhp.

George D

Sid's engine setup using hybrid parts is very impressive. I've driven a factory 968 Turbo motor that was installed into a 944 Turbo with the stock head and KKK turbo. The motor factory numbers were 350hp and 369 tq (at 3K). This motor felt more NA like in it's power delivery, and the boost was linear, but was at max pressure by 3K. The factory 968 Turbo motors came with a restrictive head as compared to the 89 944 NA head. Seeing them side by side, you can easily see the difference. The 3.0 motors feel much different than the 2.5. If you want a killer road 951, the 2.8 is the ticket. It's amazing the difference the .3 in displacement make with these motors.

blade7

I would take Sid's route if I didn't already have the crank and rods for a conventional 3.0 build. The plan was to build up a 3.0 engine and have it on a stand until I needed it, but I got into a long negotiation for a 3.2 engine that ultimately didn't happen. I want a quick but unstressed road engine with less lag, rather than one with monster power that breaks something every other month.

On a different note my Mom lives in Tucson, never been so may visit next year, be good to look at your car.

blown 944

Sounds like a good candidate for a 3.3 build. Just sell the rods and buy rods and pistons for a hybrid stroker.

blade7

I've been thinking about and collecting parts for a 3.0 for years, don't distract me now .

rlm328

Here are my $0.02. I have the a 3.0 l that I have had for about 2 years, lot of initial development head aches. It will leave a 2.5 l in the dust any where period. The tracks I race at are geared toward the mid range power band (short straights, corners, etc.) so the car is set up for this type of perfomance. The turbo is set up to start building boost around 2700 rpm but it goes flat at around 6000 rpm. Depending on temp the motor is making around 375 rwhp at 14 psi boost and around 385 ft lbs torque.

It will depend greatly on what you want the motor to do, build alot of high end power (top end speed) or intermediate power (quick at normal driving speeds).

The motor is more of a standard build, with a sleeved 3.0 l block and crank (knife edged), carrilo rods, after market pistons, aluminum fly wheel.

Turbo GT30

ECU is Motec

Stock parts, intake manifold, exhaust manifold

blade7

If I stick to my £10k overall budget I don't think a Motec ECU and setup is an option. I know the GT turbo's produce better results but I just want to bolt on the LR turbo I have initially. I don't want more top speed, just more grunt . Power that starts around 2-2.5k and tails off at 6.5k would be fine. Otherwise I might as well just throw parts/money at my 2.5 engine.

George D

When visiting Tucson, come in the spring, fall or winter. You won't just look at my 951, you'll drive her. The clutch is from a 911 TT sport, and engages like a Honda manual with zero shudder. This 951 has some of the best parts in her from Porsche. I'm amazed that a car from the early 90's is engineered to allow modern parts easily installed. Visit your mother, and let's go for a neat drive!

blade7

Nice one, but what's wrong with summer in Tucson, my Mother has a pool . We used to visit practically every year when she lived in San Diego but it's been 10 years...

George D

my car doesn't like the 100+ temps while idling at lights!

blade7

Understood .

dizzyj

I'm a sucker for a challenge

Thom

In my experience a fully standard 968TS does not have that much of an impressive power delivery. It makes a lot of torque but the engine runs out of breath pretty badly beyond 5k rpm.
Now use the exact same engine with the ~K27/11 from the 968TRS and a bit more boost will provide much better performance and a broader powerband. When my buddy lets me drive his I am able to spin the rears in 3rd gear, and that is with the wide original 18" Speedlines with decent tires.
The car makes near 400hp in a very usable manner and considering it uses the restrictive original air box that is not short of impressive IMO.

Thom

Is that a GT3076R, and with which A/R turbine housing?

blade7

Without trawling the internet I don't recall the spec of the 968 RS head, wasn't it standard 944 turbo modified to fit the 104mm block ? There's perhaps 20-30 bhp more in the 2.7 head. Was the downpipe standard 944T, there's benefits from using a bigger discharge/downpipe . Same with the intake, there's gains from a less restrictive MAF/MAP setup with a big cone filter located suitably. Maybe there were some build secrets Porsche kept to themselves, but that 350 bhp claim, even if it was conservative, looks beatable without fancy turbo setups or standalone costing many $1000's.