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Alan L's Avatar
 
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Which I/C

Been reading all the IC threads.
Am considering changing my stock IC for an improved version. I have been trying to keep the car as original as possible and the race rules for my track car mean I have to keep the original turbo (). So getting improved performance by swapping out the turbo is not an option. But changing the IC is. Altho my turbo is the modified version, I am not sure with my turbo the IC would be limiting flow and HP? But I can get the temps lower I am sure, with a more effective IC. (I do spray water over the stock IC and pull about 15 Deg C out).
My query is, will I get an improvement in performance by upgrading, and what versions in the market will bolt to my stock 3LDZ - I have no idea what short/long neck version I need.
Thanks
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 05-25-2014, 11:24 PM
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is it an option to use the 964 intercooler?
Old 05-26-2014, 12:16 AM
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You can buy dedicated Intercoolers that will fit the configuration your looking at,

Turbokraft have bolt on applications that only take fifteen minuter to install or less,
because you have a post 78 it is an easier task to make the changes you speak of compared to a pre 78

Keep your old IC so you can change back to stock at anytime,
I was keeping my old bits but am selling them now so i can pay for later better parts, personally doesn't worry me anymore as ill never sell my car not for all the money in the world.
But I think its worthwhile to improve efficency, reliability and power anywhere you can.
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Old 05-26-2014, 12:16 AM
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Clutch monkey, I have no idea what will fit. Don't know if a 964 will fit the 3lDZ. Presumably it would find enough room in the engine bay, but whether it bolts up?
but there will be some aftermarket units that should?
Regards
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 05-26-2014, 12:52 AM
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i had a look and looks like it's some form of silican pipe that connects it, so should connect up to just about anything. could use oem shroud too



failing that as robby says, turbokraft and others all have effective units available.
Old 05-26-2014, 01:25 AM
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You have to determine if you can go long neck vice short neck, which would be the "bolt on" arrangement. The long neck removes the shuttle valve which is a source of some of the turbo lag in a stock set up. I would bet that the rules you race in will not allow that, but if they do, that is a benefit beyond the greater cooling surface area of newer IC's.

RarlyL8 has a Bell unit that he advertises as "bolt on" that might do what you want.

Good Luck!

Mark
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Old 05-26-2014, 04:16 AM
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What are the rules regarding your intercooler?
If it must occupy the same footprint as OEM them mine would work, if it can be larger then the 965 unit is a better choice in your racing application where you need as much surface area as possible.

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Old 05-26-2014, 09:21 AM
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If you are allowed to use any factory intercooler, TurboKraft has a used 1991-94 Turbo intercooler available, like in clutch-monkey's photos. It is a "longneck" in that it fits directly onto the throttle body, and uses the updated smaller updated diverter valve (which increases response and drivability). It is considerably larger than the stock 1978-89 intercooler for more cooling core capacity and surface area:

1978-89: 11x11.5x2.25" // 285in^3 volume // 127in^2 surface area
1991-94: 22.75x8x2.625" // 478in^3 volume // 182in^2 surface area

The turbo-to-intercooler connection is a multi-ply reinforced silicone hose, so not difficult to connect to your 3LDZ.
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Old 05-26-2014, 12:53 PM
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Thanks guys. The rules are silent on the intercooler, so I can assume it is 'free'.
Mark - what is the shuttle valve - do you mean the recirc valve in the intake housing?
Chris - does this IC do away with the intake manifold? Is there anything else I would need to bolt it in? I'm a bit confused regarding the long/short neck. I thought it probably related to the turbo out connection.
Thanks
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 05-26-2014, 02:26 PM
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OK Chris/Mark. I think I got it. It will do away with the plenum type chamber which houses the recirc valve and o/boost switch etc. Hence the long neck to get on to the throttle body. And from what Chris says, it replaces the recirc valve with a newer type diverter valve? Have I got that right? Which should all give me some increase in performance (maybe) and less lag - because of the newer diverter valve.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 05-26-2014, 02:33 PM
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[QUOTE=clutch-monkey;8083497]

QUOTE]

Clutch-M,
Is that your AC condenser mounted almost hte full length of the hood, thus perching on top of the IC when hood is shut?
If so, do you have other condensers and/or fans, and how cold does your AC run?
Thanks for the side-bar.
Old 05-26-2014, 04:56 PM
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Have pm'd Chris.
Thanks guys.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 05-26-2014, 11:01 PM
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[QUOTE=baloo;8084563]
Quote:
Originally Posted by clutch-monkey View Post

QUOTE]

Clutch-M,
Is that your AC condenser mounted almost hte full length of the hood, thus perching on top of the IC when hood is shut?
If so, do you have other condensers and/or fans, and how cold does your AC run?
Thanks for the side-bar.
that's just the mesh-AC condenser in 964's is in the front left fender mate
my SC has a 964 engine and had 964 AC compressor and condenser under the whale tail, full length of the grille, and it was never great (likely needed gas).
Old 05-27-2014, 12:58 AM
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