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Twins are more fun!
 
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Question 993TT headers?

Can anyone tell me whether 993TT headers would bolt straight onto 3.2 Carrera heads?

Or would I need to have the flanges rotated, like the 993 NA headers?
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James
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Old 03-05-2007, 01:40 AM
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you could do that or if your pulling the heads for machine work, have them drilled for later exhaust flanges. Now you have a 3.2, which has the same oil tank layout as my 930, I think, dont know, but I believe that there may be trouble with trying to mount the twins on the sides of the motor because of the location of the oil tank. If you look at most of the twin turbo cars of our body style; they have the twins mounted in the bumper, usually with a pair of dump pipes right off the hot housing. If you want any more info on a set of manifolds let me know, I have some nice ideas because I think about them for my car.
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2008 C6/Z51 Corvette
Old 03-05-2007, 05:00 AM
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You would need to have the flanges rotated.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
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Old 03-05-2007, 08:53 AM
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Quote:
Originally posted by RarlyL8
You would need to have the flanges rotated.
Yep.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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Old 03-05-2007, 12:13 PM
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Sorry, what do you mean have my heads drilled for the later flanges? Why can't I just have the flanges rotated to suit the Carrera heads, instead of messing around with a whole top end R&R to make some headers fit?
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Old 03-05-2007, 12:29 PM
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Quote:
Originally posted by JMA-RUF
Sorry, what do you mean have my heads drilled for the later flanges? Why can't I just have the flanges rotated to suit the Carrera heads, instead of messing around with a whole top end R&R to make some headers fit?

I said you could rotate the flanges OR if you were taking the heads off for port or valve work you could drill them while they are off to match the newer bolt pattern. If you are going to do the flanges and want to use new one instead of reusing the old ones, I believe that Burns makes a real nice half in. thick set.
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Old 03-05-2007, 02:40 PM
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Cool, thanks for clarifying
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Old 03-05-2007, 04:34 PM
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Now what do you think about turbo placement? Are the 95-97 twin manifolds good when taking into account the position of the oil tank? My friend Eddie B. makes a nasty set of twin turbo manifolds that locate the turbos in the rear bumper if you are interested and/or the turbos dont clear the tank.
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Old 03-05-2007, 04:41 PM
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Look at Brian's thread. Yes flip flanges. No they won't fit without converting oil tank to 964 location (72'). But they are very short and well made providing quick spool up.

M&K (Ben) does a good job at flipping.

A concern of mine is the proximity of the turbo to the valve cover.
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Luke S.
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Last edited by Lukesportsman; 03-05-2007 at 06:03 PM..
Old 03-05-2007, 05:58 PM
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Please everyone! Don't think I'm crazy (maybe a little bit) I am well aware of the fact that the flanges need to be flipped and that on an already together motor would be easier +less expensive than machining the heads for the flanges. I was just stating that if the heads were already off the car for other machine work that it may take less money than jigging the headers up to flip the flanges. I'm just thinking in terms of what I would do back when I sent my work out to Verden to get done.
ok?
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Old 03-05-2007, 06:09 PM
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I wasn't suggesting the least

I was just giving my experience and him some leads and pictures from Brian's thread on designing his TT system. Ben (MB911) already is setup for this and he doesn't charge that much anyway. Of course if you had the heads drilled for either stud you would keep future options well open I guess. Though it sounds that in this case, he didn't plan to tear the engine down.
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Luke S.
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Old 03-05-2007, 06:20 PM
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I know- Im just bein a chooch
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Old 03-05-2007, 06:32 PM
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hehe, you guys are funny

As for turbo placement, I prefer side mounted units so I can run them into a Magnaflow dual inlet/outlet "X" style muffler. I MUST run a muffler as this will be my daily streeter too

I'm told the inlet to the oil tank can be relocated with some fancy wleding and the bottom of the oil tank can be slightly kicked outwards to make room for the turbo using a bracket. That's the path I'm *thinking* of taking.

As for oil drain. I *think* the 993tt headers will position the turbo's a bit higher than the sump drain plug, so that's where I'll drain both turbo's to, using a T at the sump drain point.

Just throwing some ideas in the air here... feel free to throw in your 2cents worth
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Old 03-05-2007, 07:34 PM
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Here is a picture of Luke's 993tt exchangers with flipped flanges on the Evil Engine with K16 turbos. You can see the passenger's side is going to be a problem.




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Old 03-05-2007, 08:23 PM
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I dont know what I would do- screw it I would run twin open dump turbos and just tip-toe by the police.
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Old 03-05-2007, 08:50 PM
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Quote:
Originally posted by 930gt-40r
I dont know what I would do- screw it I would run twin open dump turbos and just tip-toe by the police.
You wouldn't have to tip toe... they'd hear you coming a mile away!
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Old 03-05-2007, 09:06 PM
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I'd probably go with a pair of GT28RS ball bearing turbo's to begin with (set to 0.7bar) because later down the track, I want to go with some 97mm or 98mm turbo P&C's. I'd like to have the HP growth capability there, so the GT28RS's would be ideal. I can get them for $2k for a pair. The K16's would be too small for what I want to achieve down the track.
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Old 03-05-2007, 09:10 PM
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Merv- thats why I want 600 horses, those cops dont stand a chance even if they do hear me, and I dont want to hear about the "motorola" cuz I have beaten that as well.

James- The 28rs would be nasty and two would be good for between 6 and 700 horsepower. Just be prepared to watch the exhaust wheels spin 2 minutes after you shut the motor down. Ball bearings kick a$$
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Old 03-06-2007, 05:56 AM
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I'd imagine a pair of GT28RS's on a high compression Carrera motor would spool extremely quick, even if boost is limited to only 0.7bar. It'd be an interesting setup. Go for it!

930gt-40r, have you decided on a turbo yet? Is it a GT40R, as noted in your alias? I've heard someone used one of those on a 3.3 EFI turbo and made a tonne of power It has a 72lb compressor, which is good for ~612+ HP on an air-cooled Porsche motor
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Old 03-06-2007, 01:14 PM
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James,

If I were to repurchase today, I would go GT2560R (GT28R). I think these might be the hot ticket for quick spool and still head room for 600hp. They are the same chassis as the GT28RS and could be easily swapped later since turbos are a WEAR item. I was timid at the time because I hadn't planned to drop compression so I went small. I also got the dry housing so I wouldn't have to be concerned with water issue. Since, I've bought 91-92 P&C for a good deal. PM if your interested in a lead on them.

Make that a big clearance in the oil tank as turbos would function as nice oil preheaters. I'd be careful in any decrease in oil volume too with the added stress without the turbos oiling system. I'm debating on a C2 pump in the 3.2 to make sure oil flow is sufficient. It might prove a thousand dollars in vane, but/though not cheap insurance......I'd hate to find out otherwise.

The 993TT HE's have small collectors that certainly are not "Burns" fashion with only 1.5" orifice. If you get into a T3 size hot side, it might reduce velocity. I'd personally stay with a small/mid chassis with T25 flanges.

It's been discussed here before, but I'd still contemplate a low pressure minimal flow water circulation system to secure the BB's on shut down. Something simple from a boat, 944 or SC Ford. Use Al plumbing and it ought to radiate enough heat to not require a resovoir of any real volume. 5lbs including water.

Ben is the pipeline to fabricate some nice TIG'd sump plates with feedlines integrated into the Al design...might take a look, very clean versus a tapped pipe fitting.

Merv, how you liking the Spec Clutch now that's she broke in?
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Old 03-06-2007, 02:04 PM
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