944 Turbo S Engine Rebuild Thread
- Thread starter Eldavo
- Start date
I’ll use a 4” to 3” reducer for the inlet as there’s no space for anything bigger since I reinstated the aircon. No regrets though - absolute godsend yesterday!
Crossover pipe will get a T3 flange on it and the downpipe will get a V-band on it. The guy doing the welding made the downpipe (and the rest of the exhaust) at his old job so he’s well aware of what needs doing.
Turbo "should” fit straight on with a 10mm spacer on the oil drain, obviously I don’t have water lines, sensors or a regular inlet manifold/throttle body to get in the way.
Crossover pipe will get a T3 flange on it and the downpipe will get a V-band on it. The guy doing the welding made the downpipe (and the rest of the exhaust) at his old job so he’s well aware of what needs doing.
Turbo "should” fit straight on with a 10mm spacer on the oil drain, obviously I don’t have water lines, sensors or a regular inlet manifold/throttle body to get in the way.
TTM
Well-known member
Scalopping the engine mount was what the factory did to make room for the K27/11 with a huge turbine housing used on the 968 turbo RS, and also done on my engine to get good clearance with the Tial 0.82 housing, but as you know the mount is hollow and be aware that the area where the grinding must be done is not as thick as it suggests - you will find yourself quickly with a large hole that will require welding in a new alloy plate to close it.
I’m aware it’s beyond grinding - I’ve messaged an example picture of what I want to my fabricator. By "scalloping” - I meant cut a section out and replace with a curved plate for clearance. The guy I got the turbo from has his own .82 housings cast and machines them out himself so luckily it’s not too physically huge that fitment becomes a major issue.
Dan944t
New member
sounds like it won’t be too much hastle really ,… i had a mare custom fitting my whole twin scroll HX35 turbo ,… i had to grind off most of the standard oil draining part of the mount and totally bypass the way porsche drained the oil and make my own arrangement up .. ( hell of a lot of hard intricate PITA work ) especially doing it on yr own in a single garage cave man style…
this sounds like it would be a nice little nip and tuck and using the original oil sump in the mount would be fantastic ! keeps things simple in that respect
i’m sure it will work out great ????
this sounds like it would be a nice little nip and tuck and using the original oil sump in the mount would be fantastic ! keeps things simple in that respect
i’m sure it will work out great ????
Dan944t
New member
Oh you are funny - I’ve done 1100miles on this turbo you know!
I bought a 996 ABS pump on Friday and a pipe flaring kit today so that’s the winter project. Wheels need a refurb - that’s a good time to fit wider rear tyres as well [
]
May need some bigger injectors too but that’s no bother.
I bought a 996 ABS pump on Friday and a pipe flaring kit today so that’s the winter project. Wheels need a refurb - that’s a good time to fit wider rear tyres as well [
]May need some bigger injectors too but that’s no bother.
blade7
Well-known member
Can VEMS run traction control via the ABS? I'm on the 3rd set of 265/35-18 rears, which is what the 968 S/RS ran. Michelin PS2's are 265 across the tread width, unlike Pirellis that were only 265 between the sidewalls, and are less across the tread. I've seen a couple of Turbos on 285's, and they looked a bit too Fandango to me.
I’d be going from 255 to 265 - 285 is a bit much, especially as I’m lowered too, might be a tight squeeze.
It seems that TC is doable via VEMS - I might have a look into it if I go down the route of fitting the 996 pump instead of repairing mine. I’d be wiring an OBD2 port in and making some patch cables so "while you’re in there” and all that.
https://www.vems.hu/vt/help/v3/v3_tc_control.html#:~:text=The%20Traction%20control%20function%20main,or%20cut%20fuel%2Fspark).
It seems that TC is doable via VEMS - I might have a look into it if I go down the route of fitting the 996 pump instead of repairing mine. I’d be wiring an OBD2 port in and making some patch cables so "while you’re in there” and all that.
https://www.vems.hu/vt/help/v3/v3_tc_control.html#:~:text=The%20Traction%20control%20function%20main,or%20cut%20fuel%2Fspark).
blade7
Well-known member
Eldavo said:
Interesting that Monterrey on Facebook stated a 4" exhaust on his high output 8 valve made a big difference. The standard exhaust on my 87 Cosworth was a big dia downpipe that split into a double system up to the single rear silencer. I'd estimate that was equal to at least a 4" system, though it did have 4 silencers in it. I reckon the 3" system with only 1 silencer that I fitted, didn't make much difference.
Picked the mount up from the fabricator’s this afternoon. He’s done a great job - could’ve polished the rest of it like!
Probably fit it late October, was going to take a day off and do it all at their unit but will probably swap it in at home and get the car recovered there. That way I’ve got everything I need to cap off all the coolant lines, etc. and work through any niggles that pop up.
Also don’t think I’ll need to change injectors to cope either - I’m only running them at 3 bar and they can run up to 5 bar (what Rich H runs them at on his race car). Somewhere around 4bar should see me right (<80% DC and <65% Pump max flow rate) - pretty easy with an adjustable remote FPR. Probably take me longer to find my fuel pressure gauge
Probably fit it late October, was going to take a day off and do it all at their unit but will probably swap it in at home and get the car recovered there. That way I’ve got everything I need to cap off all the coolant lines, etc. and work through any niggles that pop up.
Also don’t think I’ll need to change injectors to cope either - I’m only running them at 3 bar and they can run up to 5 bar (what Rich H runs them at on his race car). Somewhere around 4bar should see me right (<80% DC and <65% Pump max flow rate) - pretty easy with an adjustable remote FPR. Probably take me longer to find my fuel pressure gauge
Fitted the modified engine mount and bolted the turbo up. Needed to hack out a load more of the alternator shroud - I know I’d have sooooo much more room if I ditched the aircon but I use it all the time.
Car is going to the fabricators’ late next week so they can modify the crossover pipe with a T3 flange and they were going to modify my 2.75” downpipe with a v-band on one end but I think I’ll just get them to make me a new 3” DP with a v-band on both ends and they can tweak the existing flange on the exhaust. I’ve got a brand new full set of 3 Fabspeed gaskets so they can go with the downpipe and #manmaths comes into play!
I need to refit the heat shields and then have a play with the exhaust manifolds as I think they have moved a bit with all my prying.
Car is going to the fabricators’ late next week so they can modify the crossover pipe with a T3 flange and they were going to modify my 2.75” downpipe with a v-band on one end but I think I’ll just get them to make me a new 3” DP with a v-band on both ends and they can tweak the existing flange on the exhaust. I’ve got a brand new full set of 3 Fabspeed gaskets so they can go with the downpipe and #manmaths comes into play!
I need to refit the heat shields and then have a play with the exhaust manifolds as I think they have moved a bit with all my prying.
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