Porsche 964 1990 C4 rebuild

Started by 80 Vert, May 20, 2018, 09:25:08 PM

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schattenblau

#20
production numbers from porsche

https://newsroom.porsche.com/default/en/products/porsche-one-millionth-911-milestone-seven-generations-13735.html

original 81,100
g-series 198,414
964 74,008
993 67,535
996 179,163
997 215,092
991 to end of the 2016 model year: 152,659
   

john;
any plans to upgrade the 964 headlights ?

Period_Correct_

1971 Porsche 911T | 1990 Audi Quattro Turbo | 2003 Audi RS6 Avant | 2009 Renault Megane R26

80 Vert

#22
I actually brought with me MK6 GTD and MK7 GTD fabric but decided now to use the MK7 material pictured on the right.
So, plans thus far are make HID headlights, custom 17" Fuchs wheels (rears completed), big brakes and custom interior / seats
Engine going back together stock displacement but with aftermarket cams, intake and will be run on much more modern ECU.
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

le mans

Motronic or something else in mind, John?

80 Vert

Im thinking MoTeC currently but there's literally soo many options these days.
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

80 Vert

All good things take time, lots of distractions have come and gone but here we are with another PORSCHE update post YES!!!
I measured the case tunnels with a bore gauge, was able to tighten clearances on a couple so everything looks extremely good, crank measured like new so that didn't need anything but a clean.
Replaced the rod bolts with ARP which meant re sizing the big ends so I thought I might was well do the small end bushes as well, all new bearings through out.
Bolting the rods back on I had 2 that were too tight, in the end it came down to 4 bearing shells being slightly tighter than the others in the packet.
I ended up ordering 4 shells from Porsche since they're sold individually. Problem solved.
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

80 Vert

Other than organising a few things that's where things got left till yesterday morning, I headed over to my friends place for an early start to assemble the cases.
We checked the oil sprayers in the case first before dropping in the oil pump and IMS with new timing chains.
Crank was assembled ready to go so that was dropped in next.


Double check we had all bearings, seals, chains etc etc and laid out all of the through bolts with their o rings as you only supposedly have 40 mins to bolt the sucker together before the case sealant goes off.
All went like clockwork, torqued the 11 through bolts first and the perimeter bolts after that.


From this point I've got the cylinders and heads soaking in degreaser, Ill strip the heads next and figure out what to do with those. Need to also make a decision on what to do about cams as im wanting to extract more power from this thing.
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

rambo_005

It's always nice to see some progress 8)

Looking forward to seeing the next steps...

Period_Correct_

1971 Porsche 911T | 1990 Audi Quattro Turbo | 2003 Audi RS6 Avant | 2009 Renault Megane R26

80 Vert

Not sure yet Nige,  spoke to a guy today with a dyno and formulated a plan.
He's going to be flowing my heads and doing other mods, going aftermarket ECU eliminating Motronic and going coil on plug getting rid of twin dizzys and leads.
Probably running RS cams and so aiming conservative 300-310hp
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

Period_Correct_

1971 Porsche 911T | 1990 Audi Quattro Turbo | 2003 Audi RS6 Avant | 2009 Renault Megane R26

80 Vert

No, that's just a rip off like many other Porsche parts with their 1000% Porsche tax.
If I do ITBs I'll put my own set together for a fraction of any kit out there.
It's all about building rather than just buying
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

le mans

Really looking forward to this coming together.

robh

I think Motec very over rated these days, so many other quality options out there.

Link gear is awesome and plenty of NZ tuners comfortable working with them.

ECUMaster Black ECU's look to be really establishing themselves in the market now.
Daily Driver - VW Touareg V8 TDI 2012 "towing beast"
Too Many Cars - Lotus Elise S 2013 "tangerine dream"
Project Car - Golf VR6 Turbo "built not bought"
Wifes - Audi S4 Avant 2012 "I want a white car that sounds nice"

Period_Correct_

Quote from: 80 Vert on June 11, 2020, 08:13:18 PM
No, that's just a rip off like many other Porsche parts with their 1000% Porsche tax.
If I do ITBs I'll put my own set together for a fraction of any kit out there.
It's all about building rather than just buying

Woah! I completely disagree with your "rip off" term John. R&D comes at a price, and these guys have been doing ITBs since forever! I suppose its overkill for your project hence you not seeing value.

Jenvey are born from motorsport and they have pedigree.
https://www.jenvey.co.uk/about/#a-little-bit-of-history

When I did my ITBs project on my mk2 back in the day, I used GSXR ITBs which were great fun, however since the size/stack length was'nt ideal it took some time to tune them. In the end I tuned it on Alpha N however I think speed density with a map sensor per cylinder would be ideal. You need to get the 6 map sensors to only send the lowest single value to the ECU and not average them. winning!
1971 Porsche 911T | 1990 Audi Quattro Turbo | 2003 Audi RS6 Avant | 2009 Renault Megane R26

80 Vert

#35
R&D certainly does cost but at 7k plus shipping and gst I don't see the justification, certainly not for me anyway.
I would sooner put a GT3 intake on over ITBs, consensus seems to say ITBs loose torque low down also.
Have you bought some Jenveys?
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

Gordo

I have some, but not on a Porsche - they're a nice bit of kit.
$7k seems rather exorbitant for bare bodies - is that a full kit with ECU, fuel pressure regulator, etc. included? The bodies themselves are no-where near that - https://store.jenvey.co.uk/throttle-body-kits/porsche-engine - but then you do have the management, filters, etc. to sort out.
These are my thoughts and opinions - sometimes I'm wrong, but not often ;-)

80 Vert

Not good news for the pistons and cylinders, 0.002" larger than what Porsche says is allowable.
Probably be fine in all reality for the limited use this is going to see but in the interests of doing things properly a new set is going to be ordered.
Comes at a cost though, almost 10K but the upside is I'll be going from 3.6L to now 3.8L and also eliminating the factory early 964 design flaw leak issue between head and cylinder.
Heads are under way, new valves, guides, springs, retainers, keepers etc. They will also be flycut to suit the new style cylinders.
New valves have smaller stems and are lighter weight.
2019 Jetta GLI (USA)
2003 Jetta Coupe soon to be R36TT
1991 Golf GTI 2.0 TSI swapped
1963 Type 34 Karmann Ghia, turbo 2.0
1990 Porsche 964 911 Carrera 4
1980 1303 Beetle vert, under restoration

schattenblau


Period_Correct_

Quote from: 80 Vert on July 29, 2020, 02:51:21 PM
Not good news for the pistons and cylinders, 0.002" larger than what Porsche says is allowable.
Probably be fine in all reality for the limited use this is going to see but in the interests of doing things properly a new set is going to be ordered.
Comes at a cost though, almost 10K but the upside is I'll be going from 3.6L to now 3.8L and also eliminating the factory early 964 design flaw leak issue between head and cylinder.
Heads are under way, new valves, guides, springs, retainers, keepers etc. They will also be flycut to suit the new style cylinders.
New valves have smaller stems and are lighter weight.

damn! the 3.6 is already quite torquey so this bump up should be really good. Which P&Cs are you going with and any interesting coating?

Sorry to hijack this thread but its quite fitting. My 2.2T with the high comp pistons, wilder cams and ported heads is almost at 100bhp/liter, it made 170bhp at the wheels and still climbing but hit limiter at 6k. I'd like to get a 8k rotor limit and see how she goes....

1971 Porsche 911T | 1990 Audi Quattro Turbo | 2003 Audi RS6 Avant | 2009 Renault Megane R26