I am new to planet 9. I don’t see a ton of stuff on older
Porsche
’s. But maybe someone knows the answer to my question. I posted the same thing on pelicans forum and got no answer.
Does the 964 3.6 naturally aspirated and the 964 3.6 turbo use the same connecting rods? Or does the turbo have an upgraded connecting rod that can handle more hp & torque?
Is there anything done to the turbo motor to make it handle the extra power? Or is the same as the naturally aspirated motor.
What is the maximum hp and torque that the stock 964 3.6 turbo motor can handle safely. (Without massive engine internal failure)?
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I just looked at the Service Information Technik for the 1991
911
Turbo and the 1993
911
Turbo 3.6. Neither motions upgraded connecting rods. Both mention i.e. from the 1991:
The key engine data are: Type M30/69
Displacement: 3,299 c.c. (bore 97 mm/stroke 74,4 mm)
Nominal output: 235 kW (320 HP) at 5, 750 rpm
max. torque: 450 Nm/332 ftlb at 4,500 rpm
Compression ratio: 7,0 : 1
Fuel: 95 RON/85MON (Premium Grade, unleaded)
The most important new features with respect to Engine Type 930/68 are:
- Crankcase bolts similar to those used for the naturally aspirated engine M64
- New cylinder design with optimized thermal characteristics
- Stainless-steel cylinder head gasket 0/2A)
- Full-flow oil filter
- Separate belt drive for 115 A alternator/air conditioning compressor and cooling fan
- Continuous injection system (K-Jetronic) with oxygen-sensor control
- Three-way catalytic converter of metal construction
- Optimized turbocharging system (larger turbocharger, intercooler with improved efficiency)
- Pressure-controlled transistorized ignition system with digital spark control
The following engine description refers to the new and modified components only. The components
not covered by this description are identical to those of the 3.3-liter 930/68 Turbo engine.
I don't know what the maximum HP that the engine can handle. But I know that the flat 6 is an extremely robust design. So I'd bet it is way over the 320 HP listed. My guess +100 HP would be no sweat. The issue is heat management and knock suppression. Internal heat is typically handled by oil spays on the bottom of the pistons. Then of course you have to be able to cool that oil. Knock now days is handle by timing of the direct injection. In the old days by either retarding the spark, water injection, lowering the compression or a combination of all those.
The reason I ask is I have a 1989 964. Last winter I put a megasquirt engine managment system on it. The project for this winter is to turbocharge it. I have all the parts I am just waiting for abit of free time to fabricate a manifold and put everything together. I have meth injection to keep my intake air temp down. That should keep my cylinder head temp in check as well. I can set my timing to whatever I want to control knock. As well as with the meth injection it brings your octane up to 117 so knock is less of an issue.
I will be rebuilding my engine and want to know if it is necessary to change the rods. I have found that the
porsche
stuff is made very well. Lots of the time better than aftermarket stuff. Rods are expensive, my goal is to do 550hp at the crank. If the rods can handle that I wouldn’t bother changing them.
If they are the same rods as the turbo which it seems like they are. someone should know what they have boosted there turbo cars to on stock internals without breaking anything.
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Plus 230 HP is a big jump but as I said the
Porsche
flat six is very robust. Sounds like you know what you are doing. So good luck!
Megasquirt is for destruction derby cars. Eventually your going to blow your motor because of hardware failure. Your better off running a cheap 100$ used aem f.i.c piggyback. Even a aem Infiniti is getting outdated I’d invest into a cheap used basic haltech 750 that won’t ever fail and has way more fail safe perimeters and has meth controllers built in and way more user friendly maps to tune.