The Beast Runs! Max Boost?

The beast runs! After pulling all of my hair out and asking a million questions on this site, I finally figured out the problem. It was actually two problems, one had to do with air/fuel mixture (running rich) and the other was getting proper power to the ElectroMotive’s.

So on to my next question:

I have a highly modified 3.4-liter, fuel enrichment, boost controller, twin plugs, and a monstrous full bay intercooler. I want to know how far I can push the engine without causing internal damage.

I have read through Bruce Anderson’s book and he says the recommended boost for a 3.4 with extras should be 1.0bar. He also goes on to say the larger the intercooler the more boost you can run, but doesn’t mention how much extra.

Any thoughts and recommendations would be appreciated.

I think you are playing with fire!!!

Geez...some people ALWAYS want MORE hp don't they...

(I'm just griping coz I don't have anywhere near the amount of money needed to hot rod a motor like yours.)

I'd suggest contacting a company that modifies turbos (some are listed on Platz mall) and ask them. When it comes down to this sort of thing you really need to know exactly what mods and parts have been done or changed to calculate what you can do.
Every alteration to a motor affects some other portion of it's operation under certain circumstances. Talk to a professional about what you have done and what you are wanting.

I bet the car is a screemer now anyway.
good luck,

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Leland Pate

___79 SC Targa

Hammer,im no a expert but from my reaserch at 1.0 bar of boost you should be fine if the bottom end has the proper harware the key is the fuel mixture to avoid piston problems,i had ride on 911s running 1.2 of boost but must people prefer to run .9 to be safe. In other notes i will love to hear what is been modified because im thinking of bring my 3.2 turbocharged engine to 3.4 still run a turbo and run 1.0 bar of boost,what brand of intercooler are you running? any information that you can pass me along will be greatly aprecciated.
Regards Juan

On a motor such as yours I would take it to a Porsche tech! I don't think Turbo cars are very forgiving let alone modified ones. One bar PSI should be fine if you have a turbo fueler or some other device to make sure your car doesnt run lean under full boost. Good luck!

Sounds like a great project AMG, do you have any pics?

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Mark
www.mark.hargett.com
mark@hargett.com

GO FOR IT !!! But be smart about it. I had a Turbo BUICK(!) that ran 27 PSI using race fuel on a stock bottom end. I only upgraded the heads, fuel system, and the intercooler. The only problem with boost is detonation. Boost won't kill anything, but too much boost will make your car pre-ignite and that is what blows things all to hell.

Does your engine management system utilize a knock sensor to retard timing? If so, the software should hear the detonation long before you feel it. If your car does not have a knock sensor - get one. I tapped into the ECM loom and wired a little red LED to indicate when my motor was knocking. A noisy motor can give false alarms, so the sensitivity is reduced a little, so when shopping for one, ask how quickly it will register detonation.

The three obvious ways of preventing detonation are: 1increase the fuel's potential energy. You do this by 1) cooling the fuel 2) raising the volume of fuel delivered or 3)increase the fuels octane
2cool the incoming air charge via the intercooler. Sounds like you are in good shape here
3 retard ignition timing (chip?)

A little more boost will equate to a significant increase in power. Personally, I think most turbo motors are WAY under utilized. Not to say that being on the edge is good. But the view gets better the closer you are…

Hello

Well knocksensor ain´t there.


VIPRKLR shows the way. more cool air and more cool fuel.

How far to go is hard to determine and detonation is expensive.

Just add an lambdasensor and an A/F meter to find out when it goes lean. Try waterinjection on the intercooler or into the intake plenum. Try to get more fuel rushed in via coldstartenrichment ( I think i mentioned it on rennlist ).

I would recomend to ask at the protomotive bulletin board. Visit Andial HP tech section F&Q and well hadn´t seen it on rennlist jet.

Grüsse

I cannot imagine that 1.0 bar would be pushing it on a twin-plug huge intercooler motor. Install a good air/fuel mixture gage with a bung in the crossover pipe so all cylinders are equally represented. If you always see a rich mixture you're in good shape. The knock sensors used by the 965s detect ping for each individual cylinder and retard each as needed. Could you integrate a system like this? I don't know your engine management system's capabilities. Are you trying to extract every last once of HP? If not then keep it simple. Find the max, back off 10%, lock 'er down, and have fun!

The vehicle started out as an 85 RUF BTR. The owner felt this wasn’t good enough so he decided to take things one-step further. (I know it’s a sin, nobody should modify a RUF). Due to the extensive modifications, I was able to obtain the car for a song. Owning a 930 has always been my dream, last year it was finally realized.

The first time I drove the car it frightened the hell out of me. Please understand that I have driven some of the world’s fastest production vehicles and nothing felt like this. I have done over 200MPH in a car before and 200 on a street bike, so I’m familiar with speed. When I first got the car, if the digital boost gauge was accurate, the car was pushing 1.3 bar of boost. Needless to say I backed the boost down ASAP. The sheer brute force of this car is staggering. I currently have 335’s installed at the rear on a custom set of BBS wheels, if you are not careful they easily liquefy. I have only been tested by two other vehicles, once by a Twin Turbo 911 and the other by a new Z06 Vette. Both times I left the respective owners wondering what the hell just happened.

This is what I know so far about the engine from tracing the cars history:

3.4 liter punched out to a 3.6 liter
RUF Cam
Twin ElectroMotive HPV1’s
Twin Plug Heads
Miller Woods Fuel Enrichment with 6th injector
Mahle Rods
GHL Headers
RUF Turbo Boost Controller
Andial Intercooler Temp Gauge
Andial Long Neck Intercooler… I think, but not positive (Full width polished aluminum)
Andial Digital Boost Gauge (Not real accurate but looks great!)
Normal Analog Boost Gauge
Ridiculous Edelbrock Air Filter
C2 Pop Off Valve

I will post some pictures shortly. The engine compartment needs to be detailed and re-painted. Most of the paint has started to chip on the fan, fan housing, etc due to excessive heat. So beauty is not a word I would use to describe its appearance.

I’m currently in the process of restoring the interior.

Hello

Knocksensor on 3,6:

each cykinder has a boss and a threat on the enginsided end. Porsche bolts on an spread w with the sensor sitting on it. If the Cylinders have the threat then get the parts and bolt on.

Grüsse

Ohhhhhhhhhhhhh, I want that car......



Adam Roseneck

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1978 911SC 3.0
roseneck@cyberbeach.net