cobalt964

hello, first I am a 30+yr Porsche veteran and this build pisses off the purists a lot. lol. I have owned many many Porsche 911's over the yrs, stock ones to wild race cars. I am now a 964/911 fan and love ls motors simplicity, reliability, and hp/tq. so the marriage of the Porsche with a hot lsx motor was a no brainer to me.

cobalt964

the build;

a pristine 1993 Porsche 911/964 Carrera coupe with 26k miles. the car has full monoball spherical bearing suspension, camber plates, bilstein nurburgring adjustable coilovers with h&r green springs, full cage, full interior, 17" twist wheels, Michelin pilot cup tires, rsa whaletail, and front brake ducting.

the motor is a 2010 low mile corvette ls3 6.2 aluminum v8 with hotcam, ls7 full roller rockers, arp head studs, arp main studs, arp rod bolts, new rings, new bearings, new oil pump, new 2013 ls3 aluminum road race pan with trap door baffles, stainless steel headers, stainless dual magnaflows, cai with k&n, massaged ls3 throttle body, ported heads, copper head gaskets, copper exhaust gaskets, and a tune. motor is ready for spray or boost depending on what I decide. conservatively lets say its 500hp at the crank.

the transaxle is a 964 derivative crossed with the legendary turbo g5052 internals. I am using a g5005 ring and pinion as it is the tallest in the Porsche family, and the g5052 2nd thru 5th gearsets. lets just say the car is very capable of 200+ mph.

cobalt964

this is the car I started with in 2008. drove it minimally with the Porsche motor and was not satisfied. Porsche motor was a well tuned 3.6 twin plug flat six, with cams, stainless headers, cat bypass, cai, and a tune. it was fast because these cars are light but it was not a rocket like I want.

cobalt964

as the build progressed I had the car professionally painted oem factory Porsche cobalt blue. it was completely disassembled and painted and reassembled.

cobalt964

here is the transaxle after its build, I am running a Kevlar clutch with a resprung turbo pressure plate.

cobalt964

I built my own lsx to Porsche engine cradle so it is a simple bolt in, no cutting on the Porsche. the cradle bolts to the ls3 in the gm location, then bolts to the car in the Porsche motor mount location. plain and simple. I designed my setup to use inexpensive ls truck accessories instead of the Camaro or corvette parts.

cobalt964

I am running top shelf quality parts from the likes of several nascar suppliers. I am running a meziere remote electric water pump, meziere inline billet thermostat, meziere water blocks, griffin 3 row aluminum radiator with spal fans, gates green stripe hoses, etc etc.

cobalt964

I have built my own billet alternator mount, my own stand alone 4 wire ls harness, my own cradle, and my own exhaust. I designed the cooling system as renegades does not have a 964 specific system that fits and bolts in and works. mine does. nothing against renegade, they are good guys but I wanted a 964 specific system. I machined my own vss billet mount and my own vss reluctor wheel to read the gm signal back to the pcm.

LORDDiESEL

Nice work! Any more details on the cradle you made?

2muchboostNY

iTrader: (8)

Amazing work there sir. This project should be awesome upon completion. Subed....keep up the good work.

cobalt964

thank you for your kind words guys. diesel what would you like to know? it is 1.5 inch .120 wall steel. it is supported at the back of the car in the factory Porsche motor mount holes, then also supported at the back of the transaxle as well. it cradles the ls motor and bolts to the gm motor mount locations on the block. it allows full use of truck accessories such as ac, alternator, and truck exhaust manifolds. I would be glad to answer more questions if you have them.

post script, my cradle allows usage of the truck alternator but I have my own designed alt mount so it mounts low on the motor.

hayabusa

iTrader: (7)

Very nice!!!

cobalt964

the Porsche 3.6 six cylinder weighed 535lbs with the exhaust and ac, alt, and components. the ls3 aluminum v8 with ss headers, ac, alt, and cradle weighs 470. so that makes the v8 65lbs lighter. the v8 is physically quite a bit smaller than the 3.6 in the engine compartment so it would make sense. there is tons of room in the engine bay with the v8 where with the Porsche six it was stuffed in there tight. the Porsche alternator and ac were up high on the Porsche motor, and the alt and ac are down low on the gm motor. so weight and cg are a non issue here.

J38

It boggles my mind that the LS is lighter and makes twice the power. What. The. S***.

And yes, it makes the purists mad. Because sacrilege!

What are you going to do about the gauges?

cobalt964

the gauges are fairly easy, you use the original vdo sensors for the Porsche motor and adapt them to the ls block. then they talk to each other no problem. the only difference is the tach and there are several solutions. either have the tach modded by Hollywood speedo, or have the pcm recalibrated, or put a Porsche 4 cyl tach in it, or or or, lol. I am doing the Porsche 1976 912e tach, matches my style of gauges, and it reads a 4cyl pulse. the ls pcm stock puts out a 4cyl pluse. it really is a pretty easy swap.

I am determined to make it look very clean under the decklid. what I mean by that is, if you weren't a Porsche gearhead, or a gm ls gearhead and were to see my ls engine in my Porsche, I want it so factory looking and clean looking you would think it was born there.

cobalt964

j38, I agree, its crazy that the ls3 is lighter and makes twice the power on pump gas. but hey im not gonna complain, lol.

the Porsche motor made 260hp 214tq, the ls3 in stock trim makes 436hp 430tq.. not exact on the ls3 tq number but been told its around that. with my mods mine should easily be 500chp and tq likely similar. it will make a monster out of a 2500lb car.

gnx7

iTrader: (28)

Love the 964 Porsches!

That car will scoot with nearly 300 ft/lbs off idle.

How did you source the G50/52 transaxle? Aren't they incredibly hard to find?

cobalt964

gnx7, yes they are very hard to find. and very pricey too. 10grand isn't absurd for a used g5052 transaxle. but they will take 750tq stock. you beef them up and you can hold 1000tq great transaxles.

Andy1

cobalt964,

Do you have more photos you could share with us? Would be nice to see your cradle solution. I built a 914 LS1 with a six speed Audi 01e transaxle. I too built a cradle arrangement; 6 bolts and the engine/trans drops out. Yeah, the purists hate the car.

Andy1

cobalt964

andy1, yes 8 bolts and my engine and transaxle is out. after I built it, I decided to go the ls3 hotcam route, so I pulled the motor/trans/cradle back out of the car and it only took 15 minutes to pull it. pulled the front of the motor off, replaced the cam, and pushrods, put it back together and put it all back in the car in under 6hrs. cant do that with a 911 engine lol.