All Porsche powertrain in SLC?

A search never really answered this question so I figured I'd post it. Has anyone ever thrown both the engine and gearbox from say a 996/7 GT3 into the back of an SLC? The sound and performance of that 3.8L flat six is astonishing in my opinion and they seem to run about the time an infant takes to become an adult with few issues.

I know the common response is going to be, "With $$,$$$ anything is possible!", but I'd like to know if anyone has already attempted this feat. If so, was it a success/headache?

Thanks for your responses in advance.

Lucas
 
There's a guy in California building an all Porsche drivetrain SLC. I think it's GT2 stuff...

Not sure if I can post external links on here, but if you google timtt...you'll find his build.
 
There's a guy in California building an all Porsche drivetrain SLC. I think it's GT2 stuff...

Not sure if I can post external links on here, but if you google timtt...you'll find his build.
Thanks for that info! I must say his build is looking quite interesting I wonder how he plans on running the exhaust. Correct me if I'm wrong, but isn't the gearbox mounted backwards,upside down, or a combination of the two in the normal Porsche gearbox w/ LSx combo. If that is the case would the motor essentially be mounted backwards as well? Just trying to piece this together...
 
Why? A v8 is better, faster, cheaper, more reliable and sounds awesome. When I was researching my options for my 917 I couldn't help but shake my head that people would ever want a porsche engine. I couldn't find one reason that ever made me jump up and say 'must have!'
 

Cliff Beer

Supporter
You bet, that 3.8 sounds wonderful, but for the money you need to spend on an all-porsche drive train you would have tons of money left over for equivalent horsepower with a SBF/SBC. In other words, you need a GT3 or turbo engine to get close the same hp/tq, and that starts to get real expensive. If money/cost doesn't matter, well, heck yeah, that could be a helluva drive train.

What would be extra-coolio is the new Ruf V8 in there. Haven't heard the exhaust note it makes but it's probably pretty good. Speaking of exhaust notes, how about the engine out of an Alfa 8C? [ame]http://www.youtube.com/watch?v=aQ8xDia5RNY[/ame] Now that sounds good!

Don't forget to flip the transaxle!
 
Yea, I'm here. It's a 996 GT3 (naturally aspirated) drivetrain. Turbo or GT2 (also a turbo) probably would be very hard due to the exhaust routing.

Here is a more detailed response: Does a Porsche engine fit? « blog.timtt by Tim Trampedach

You can see more info by browsing the older threads too. Ben also nagged me last night to post more. Soon! (appreciate the nag as I'm clearly not that great about consistently posting updates)
 
Thanks for that info! I must say his build is looking quite interesting I wonder how he plans on running the exhaust. Correct me if I'm wrong, but isn't the gearbox mounted backwards,upside down, or a combination of the two in the normal Porsche gearbox w/ LSx combo. If that is the case would the motor essentially be mounted backwards as well? Just trying to piece this together...
yes, if you are using a 911 based engine and transmission, the transmission would be flipped upside down and turned around 180 degrees. The engine is backwards, comparing it to the installation in a 911.

If it's a turbo motor you are thinking about, this puts the turbos in front of the engine, so the entire exhaust system would have to be changed to locate the turbos either to the rear or outboard of the engine. This will require custom exhaust work on the older motors, possibly not on the newer motors as the motor header flanges are mirror images of each other and could be flipped....left header on the right side and right header on the left side...

By the time you are done with that you will have big bucks into the motor. Probably 2 or 3x that if using an LSx motor....but if it's the sound you are after, then there is only one way to go....
 
If it's a turbo motor you are thinking about, this puts the turbos in front of the engine, so the entire exhaust system would have to be changed to locate the turbos either to the rear or outboard of the engine. This will require custom exhaust work on the older motors, possibly not on the newer motors as the motor header flanges are mirror images of each other and could be flipped....left header on the right side and right header on the left side...
The turbos are actually on the sides, not the front of the engine. See pics here: Los Angeles Dismantler for Porsche 911, Boxster, Cayman & Cayenne - Used Porsche 911 996 Twin Turbo Complete Engine Turbo Chargers Exhaust. That's what makes it hard to get the engine in there.

Check out some of the 996/997 stuff available at LAPD though. $16k for a moderate mileage 996 GT3 engine. Lots of turbo stuff including transmission for sale. Stay away from the new DFI motors though. I looked long and hard and really wanted to use the new Carrera engine, but it's about $10k of ECU hardware plus more complex tuning. And for some reason they didn't trust the engine enough to put it in the new 991 GT3. At least for now, it's the Metzger block still.

Tim
 
I thought that the Metzger was gone for 991. Did they back step from earlier comments? Of course that might have been journalist and never Porsche development making those forecasts. I'm from the aircooled camp, Tim, how much does that GT3 setup weigh? Engine or engine/tranny combo?
 
I thought that the Metzger was gone for 991. Did they back step from earlier comments? Of course that might have been journalist and never Porsche development making those forecasts. I'm from the aircooled camp, Tim, how much does that GT3 setup weigh? Engine or engine/tranny combo?
I think you're right for the regular road GT3 - no Metzger and instead 9A1 with DFI and PDK. The speculation is that for homogation, the GT3 RS may keep the engine, since the Cup (announced - definitely) and RSR (unannounced - likely) retain the Metzger. Folks are complaining that this makes the GT3 a softer car...
 
Anyone have thoughts on the 997 transaxle? I've seen them NOS for under $6k. Now at that price I'm sure they are open diff, but seems like a decent deal if the ratios aren't silly. I haven't researched the gear spacing as I first wanted to hear if applicable from anyone experienced.

Seems like each generation has shown some improvement from Porsche, at least once they conceded that Borg Warner might have a better mouse trap for syncros than the 915 could offer.
 
Anyone have thoughts on the 997 transaxle? I've seen them NOS for under $6k. Now at that price I'm sure they are open diff, but seems like a decent deal if the ratios aren't silly. I haven't researched the gear spacing as I first wanted to hear if applicable from anyone experienced.

Seems like each generation has shown some improvement from Porsche, at least once they conceded that Borg Warner might have a better mouse trap for syncros than the 915 could offer.
I can help you with some information on the 997 gearbox. It is not a bad unit if you are fairly careful with it. In some track applications, we have noticed some durability issues, but otherwise a pretty nice unit.

In terms of overall cost for a good gearbox you might want to consider the G96.00 gearbox instead. Check out this deal we are offering.

$4,600.00 Gearbox inverted ready for installation
$1,800.00 Adapter kit with custom flywheel (for LS applications)
$1,169.00 Stage II clutch kit
$102.00 Bolt kit
$168.37 Slave cylinder

$7839.37 Total plus shipping.

Just some food for thought.

Erik Johnson
 
Thanks Erik, for the answer and the details on "the package". I have two 930 long bell boxes and a G50 in shop amongst other less appropriate trans. Is the G96.0 box a better choice? What condition or preparation is done to the G96.0 box? Are sycro's freshened or does it at least get a once over?

Fran: What beyond Erik's package would one need to spec out or request in preparing this box for an SLC/LeMans? Obviously we are still short a shifter and rod, but I guess I'm interested in parts/options that "we" should ask of someone like Erik.
 

Fran Hall RCR

Moderator
Shifter system is part of our kit....so not an issue

if you want to bolt a Porsche engine and trans into the chassis you will need to use a 930 and flip the ring and pinion or modifiy the bellhousing of a G50/G96 with the addition of four new mounting lugs...as the ring and pinion cannot be flipped in those transaxles , like it can in a 930..

Gbox can modify the 930 or the G96 for a bolt up option to a Porsche engine....neither of these issues arise when using a non Porsche engine btw....the adapter plate negates the issue..
 
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