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993TT heat exchangers on 964 motor?

Hi all,

Does anyone know whether 993TT heat exchangers will bolt up to a 964 motor?

Do flanges need to be flipped or anything?

I know 993tt exhaust ports are 1 5/8" in diameter. What are 964 ports? Would a mismatch cause any exhaust flow issues?
Old 08-16-2011, 03:02 PM
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I think you have to flip the flanges on one side - my buddy Dave used them on his 3.8TT 964 build.
Old 08-16-2011, 03:14 PM
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Thx for confirming
Old 08-16-2011, 07:53 PM
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Yes, flip flanges on one side.
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Old 08-29-2011, 09:57 PM
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Thx, Chris. Just dreaming of a 3.6tt project
Old 08-30-2011, 02:51 AM
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I could do with a new right hand 993 header, mine was a little bent when i bought the engine, and although it's working fine i get a very slight leak from the middle flange.... No big deal but it's bugging me.....
If anyone has a spare right hand one, or knows of anyone with one, i'd be very grateful. My other choice is to buy a set of Fabspeed ones, as Brian hasn't got as far as producing 993 stuff yet which is a bummer
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 08-30-2011, 07:42 AM
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Quote:
Originally Posted by JBL930 View Post
I could do with a new right hand 993 header, mine was a little bent when i bought the engine, and although it's working fine i get a very slight leak from the middle flange.... No big deal but it's bugging me.....
If anyone has a spare right hand one, or knows of anyone with one, i'd be very grateful. My other choice is to buy a set of Fabspeed ones, as Brian hasn't got as far as producing 993 stuff yet which is a bummer
If you're looking for a NA 993 right header I may be able to help. I've got an extra 993 header but I'll need to check if it's a left or right side header. Without verifying I do believe it's a right side header!
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Old 08-30-2011, 07:48 AM
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Very kind of you mate, but it's a turbo one i need..... If you hear of one, or even a pair come up please give me a shout, thanks again
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 08-30-2011, 07:55 AM
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Keep an eye open on eBay as they come up every now and then.

Or you could go with aftermarket FabSpeeds?

Also try some of the automotive recyclers.
Old 08-30-2011, 02:44 PM
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It's like looking for a needle in a haystack. Was looking for a set for a turbo project, still cannot find any, although, at one time L.A Porsche Dismantlers had a set for about $1400. Actually took a pair of NA 993 headers and fab them into a "turbo set". Good luck with the search.
Old 08-31-2011, 08:33 PM
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Garage
I turbocharge 964 with 964 header, single turbo



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Old 08-31-2011, 09:59 PM
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They are rarely ever changed on a 993 turbo as the stock ones are good for big numbers, i may get lucky though...... I may just wait for the winter and have a machine shop do a better job straightening the one i've got, that's probably the way it'll go. Sorry for the thread hijack
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 08-31-2011, 10:45 PM
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Yeah, stock ones support big power, especially with light mods. You look at that collector and you wouldn't think so, but it'll flow enough to do 645rwhp.
Finding them is difficult, though.
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Old 09-02-2011, 02:53 PM
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Yeah, stock ones support big power, especially with light mods. You look at that collector and you wouldn't think so, but it'll flow enough to do 645rwhp.
Finding them is difficult, though.
When you say light mods, do you just mean honing and polishing them out a little to improve exhaust gas flow into the turbos?
Old 09-02-2011, 03:16 PM
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I'd have thought Brian would have got something on the cards for making these, so that they would fit all cars, with those headers it would be easier for people to do twin turbo conversions, and use other 'off the shelf' 993 parts.
They are so short too, which no doubt helps with velocity, heat and spool up
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Jonathan.
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 09-02-2011, 03:22 PM
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Hey Jonathan, what mods do you have on your 993TT motor to get 520PS/515lb-ft? Very impressive

You're not running the stock 3K-K16's obviously?!

Have your K16's been high-flow'd?
Old 09-02-2011, 04:33 PM
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My engine has the RS Tuning 520 package fitted which includes...
993 NA 3.8 RS cams
K24/26 RS Tuning spec turbos
Sport cat pipes with no mufflers
5.0bar FPR
Then their engine dyno map.
The above puts a stock 993 turbo motor at 520PS, i then added for safety
Arrow Rods
ARP rod bolts and head studs
Solid lifters to eliminate the stock 993 hydraulic ones
Back dated cam sprockets to eliminate the friction fit 993 ones
K&N panel filter
RS lightweight flywheel
Sachs 800nm clutch with racing disk
And obviously eliminated the power steering pump, aircon compressor and the other useless crap.
Secondary oil cooler
I think that's about it?

I'm off to VMax now, similar event to your texas mile but we have a little more length to the track. We've got a two mile runway and we accelerate for 1.5miles and brake for the last 0.5.
I'm hoping to get up to 190mph today, it's a shockingly bad surface so i can't see me getting much higher. But i have a mate with a 964 who should be getting above 210 I'll post plenty of pics and vid tomorrow
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87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 09-02-2011, 09:21 PM
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Quote:
Originally Posted by JBL930 View Post
I'd have thought Brian would have got something on the cards for making these, so that they would fit all cars, with those headers it would be easier for people to do twin turbo conversions, and use other 'off the shelf' 993 parts.
They are so short too, which no doubt helps with velocity, heat and spool up
Very simple to so, IF you don't need/want heat exchangers. That's where the complexity and expense comes into the equation. We have fixtures for making no-heat versions with either factory turbo flanges, or flanges for Garrett GT turbos.

Off the shelf 993TT parts... are getting increasingly difficult to find used, and are really expensive new. Throttle body assembly, intercooler, scavenge pump (A/C compressor stand), air intake plenum -- each makes a Twin Turbo conversion loads easier, but are priced like those factory headers: $$$$
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Last edited by TurboKraft; 09-03-2011 at 02:55 PM.. Reason: addition
Old 09-03-2011, 02:53 PM
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