I want 500 HP but need help
 

I would like to get about 500 hp out of my Porsche. I am going to do a 3.6 conversion but have not selected an engine yet. Which engine should I go after? I am also looking to add twin turbos to the equation. What are my choices and costs on the road to getting 500 HP? Thanks

Most importantly, lots of money . . . ;)

400
 

I need some suggestions as far as engines and a range of prices to get to that hp?

http://www.rennsportsystems.com/
http://www.imagineauto.com/

A friend of mine pushes 700+ with dual turbo-converted N/A 3.6 , so i guess it's correct choice.

With other words:

Dual-plugged 3.6 engine, lower C/R pistons, twin turbos, aftermarket EFI and good intercooler will do the trick.

Other is using 930 engine with one big turbo, but it's going to be quite hard to drive.

Get someone with rock-solid credentials to help you on this one...even with an experienced builder you're going to be paying megabucks for 500hp. Get an inexperienced builder with lots of ideas and you'll be paying for his trial-and-error...

PS, would help to know where you are located so we might be able to recommend a reputable local builder.

why 500 hp? What's your goal?

Do you want bragging rights or is there a reason you want to spend a lot of money on a lot of horsepower?

Where do you want the power? Turbo lag will be an issue, big time if you don't run twin turbos. A twin turbo engine will run you about $20K or more...

-Wayne

Hi,
I'm working on the rebuild of a 956 engine with twin turbo and about 720 hp and very low lag for my 961.
The price for the installation and management is about 25 K$ added to the revised base engine block. We are using a M800 ECU with additional modules to manage the valves.
Here in France we do such conversions, but you also have very good engine tuners in US.

regards,
Luc.

Here's another path (Renegade Hybrids) and a sample of their work:

http://cgi.ebay.com/ebaymotors/ws/e...&category=10156

YMMV

Disclaimer: While anything is possible via the liberal application of time and/or money, I am not responsible for the foolishness of others.

You will probably need to consider a different transmission as well. You offer no specifics as to the car you are modifying. A 930 transmission would probably make the most sense.
-Chris

Wow, 961, very impressive. For those who don't know, the 961 is the Race-Prep version of the 959...

-Wayne

Well, we work hard to rebuild it like it was in 1986 at Le Mans... :)
Our goal is Le Mans 06 ;)

Luc:
Great story on your page about the 961!

Regards,
Andrew M

Thanks Andrew :)
I go and see the car this week-end to check how the work is done for the chassis.
I'll take more photos !

If you want over 300 HP and do not have water cooling you will be looking at a very short lived engine. Thats according to a Porsche engineer who should know. He said one big reason Porsche stopped at 300 HP with air cooled engines was that they could not get any real reliability out of them if they were over 300HP. I have personally seen 600 plus HP Porsche engines, but they all put a very pretty white coating on the exhaust pipes. The pretty white coating is the melted piston material coating the exhaust.

WTF?

Jack,

Please tell us your joking about that statement.

That statement is just plain misinformation. CIS turbo motors can make about 475hp with stock injection, and make it reliably as a daily driver.


We have built some seriously powerful engines. In the realm of 850~900 hp. This is of course using modern engine management,The few failures we have experiecenced are not cooling related at all.

The failures are component related..


The nut shears off a Turbo shaft?

A cam nut backs off?

Heck I get 200 hp out of my 2.2, and its dead nuts reliable..

I think the entire modified 930 community would also disagree with snowman's comments . . .

:rolleyes:

There's plenty of wiggle room in both arguments. Snowman's comments regarding reliability on a air-cooled production car are probably accurate - IF you think of it from Porsche's perspective. An engine that must last 100,000+ miles with little or no problems would be tough to achieve.

-Wayne

Show me any other engine with 400+hp that matches the reliability of the 930.
Rick '78 930