It's finally time to get started on this project affectionately known as Frankenstein. All the exhaust is off the car and I've convinced myself there's no sense in making an N/A exhaust and then altering for turbo and doing it twice so let's BEGIN!
A little about the Frankenstein -
Base Specs:
1992 (964) Carrera 4 Cabriolet chassis
- 3.6 twin plug non-vram motor
- 5 speed G50 normally found in 964 C4
Bodywork:
-993 wide body fenders and quarters
-993 turbo front and rear bumpers + lights and mirrors
-964 speedster shell, windshield, doors + glass
Essentially a 993 Speedster clone since only two people on this globe were lucky enough to get the real thing (Shout out to Ferdinand and Jerry Seinfeld)
As you can very clearly see, the ship of "Porsche Purist" has long since sailed so it's time to amp up the crazy (and hopefully power) to a level matching the Frankenstein moniker.
In terms of my parts list; some things I have pretty well sorted out and a few other things I'll probably need some suggestions on as not too many people seem to be going this route on the 3.6's (I assume largely because of their value as a swap and their relatively high compression?)
Engine:
- mechanically, the plan here is to leave the engine completely stock internally... at least initially as it seems like a really healthy mill and I'll go on the conservative side power wise to keep things together
- looking to stay at 7lbs/0.5 BAR with high octane fuel and safe tune on the rich side
- what is your experience with the ceramic lining on the 964 heads? I hear bad things
Fueling and Engine Control:
- VEMS plug'n'play for 964
- E85 for fuel
- Siemens Deka 80lb injectors
- in-tank fuel pump upgrade *suggestions here please*
Exhaust/Turbo:
- 964 heat exchangers using collector where cat would be
- making a J-pipe from heat exchangers to single T3 or T4 flange with wastegate provision (leaning towards T4 due to the big displacement but worried about turbo physically fitting with that large of a frame)
- Thinking GT40/42 sized turbo to limit torque below peak and keep things efficient (I want non-stressed HP, low EGT + backpressure again because of ceramic lined exhaust ports
Anyone see any problem with the above exhaust plan? From what I understand, the 930 headers won't fit for me and my 964 engine and typically have same sized primary tubes as my stock 964 ones anyways...
Intake:
- deleting AFM flapper box with switch to MAP based tuning with VEMS
- likely going to be non-intercooled at least initially while I monitor IAT's and slowly add in boost;mind you I want to keep the smooth speedster tail look and this car will be fed E85 exclusively...
- basic intercooler piping kit to string it all together
- if I do find the need to do an intercooler, I see myself doing a small air:water cooler and putting an ice-bin in the speedster shelf area where the back seats used to be.
Misc.: (this is honestly the hardest part!)
- oil feel and drain *can I use 930 stuff? Does my 964 engine have the same oil feed provisions? Will a engine case drain plug style turbo drain work for me?*
- is there anything I'm missing or glazing over that I need to be reminded of?
Thanks in advance and pictures of FrankenPorsche to come soon.