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3.0 vs 3.3 turbo motor

Any advantage/disadvage between 3.0 vs 3.3 turbo motor? I've run across a 3.0 turbo motor for sale. Ultimate max c.h.p. would be in the 300-350 range. The stock i/c location is not going to work. So some type of aftermarket or custom i/c with either motor. This will bolt up to a '84 915 box. Is the 3.0 a direct bolt up, or do I need to go to a different clutch package.
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Harold
'79 930/DP935
'68 VW Turbo Crewcab
Old 04-30-2014, 09:14 AM
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Both will bolt up to a 915.
The 3.3L is 7:1 compression, so better drivability at your altitude than the 3.0L's 6.5:1.
3.3L also has a higher flowing CIS system.
Small difference in intake manifolds' throttle body angles.
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Old 04-30-2014, 09:23 AM
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Don't the row 76-77's have the higher flow fuel head too?
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Old 04-30-2014, 10:13 AM
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Brando
 
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I have the 3.0 bolted to a 915. Ask any questions you like.

I started with a powerclutch and it spun that pretty quickly with an andial intercooler and gt30r turbo.
Now I use a centerforce clutch and that holds the torque fine.
I have gone through one 915 gearbox though. On my second and looking for a g50 for the future.
Basically I love the little 3.0T. It takes a lot of verbal abuse but it's a great little engine and makes a screamer of a car. Look here:
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Old 04-30-2014, 11:40 AM
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Quote:
Originally Posted by Les Paul View Post
Don't the row 76-77's have the higher flow fuel head too?
No not the 76 - 77 930 Turbo motors.

All '78 and '79 US (North American) and RoW 3.3 motors had the big cast iron fuel heads and non-Cat systems. I believe all RoW 930's from '80 thru ''85 were the same. If it is a street application, and dependent on where you reside, you may need to deal with emissions issues if the motor year does not match the chassis year???
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Last edited by porche; 04-30-2014 at 12:35 PM..
Old 04-30-2014, 11:43 AM
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I was told back in the day by two reputable shops who did rebuilds on my 76 Euro that it had the higher flow heads. I think the guys at Andial said the same thing.
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Old 04-30-2014, 12:46 PM
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The 3.0 L. engine is about 25 kgs. lighter, has a shorter stroke, lower compression and sits around 30 mm. further ahead in the car due to the short bell gear box.

As far as I understand, the fuel head discusion applies only to 3.3 cars.
The 3.0 cars featured the same fuel head for all markets.
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Last edited by cover; 04-30-2014 at 02:19 PM..
Old 04-30-2014, 01:52 PM
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Which is the G50 of choice, 02?
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Old 04-30-2014, 04:35 PM
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01
Old 04-30-2014, 04:52 PM
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All the Carrera G50 boxes are awesome with a Turbo engine for street use.
Normally, the 1987-89 Carrera box is easiest to install.

But if this is for that other vehicle... you could also easily install a 1990-94 C2 transmission, or C4 one if you get a different nose cone (cover) and delete all the AWD stuff.
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Old 04-30-2014, 05:19 PM
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Quote:
Originally Posted by gumba View Post
Any advantage/disadvage between 3.0 vs 3.3 turbo motor? I've run across a 3.0 turbo motor for sale. Ultimate max c.h.p. would be in the 300-350 range. The stock i/c location is not going to work. So some type of aftermarket or custom i/c with either motor. This will bolt up to a '84 915 box. Is the 3.0 a direct bolt up, or do I need to go to a different clutch package.
Ive got a 3.0 930 euro came from the factory without an intercooler

A PO swapped out the 4 speed for a later 915 Box

I added a 3.3 intake, BOV and IC to mine as it just missed the parts bin for the Intercooler they were introduced in late 77.

I rotated my throttle body to make the factory 930 IC fit and removed the big airbox in favour of a fabspeed air intake
Engine is Still all from Porsche except the air intake but i have more flow so im happy with it

A Major improvement is Boost safety and engin bay room as i also removed the aircon and compressor, The IC fitted without a hitch into the big tail, when i have my ignition sorted ill be increasing my spring to 1.1 bar, currently .8bar without the mods when i first got the car and without knowing i was running 1.2 bar springs she handled that, i guess it depends on the condition of your engine on the inside too.

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Old 05-02-2014, 09:04 AM
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I'm running a g5001 in mine and you'll not believe how well these match up to the rev friendly 3.0. I would recommend adding a reinforced side cover and your good to go.
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Old 05-03-2014, 05:14 AM
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More grunt(torque) from the 3.3L is always good.

Center-force clutch/plate mated to the 915 has worked flawlessly.
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Old 05-04-2014, 06:28 AM
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Does the g50/01 use a hydraulic clutch? If so, did you convert to a hydraulic system?
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Harold
'79 930/DP935
'68 VW Turbo Crewcab
Old 05-04-2014, 07:28 AM
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Yes, change over to the hydraulic clutch. It's a easy swap if you get the parts from a g50 donor car.
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75 930, 76 930, 83 SC EFI turbo
Old 05-04-2014, 03:34 PM
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