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edbaus's Avatar
 
Join Date: Dec 2001
Location: Ohio
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pistons for my 930

I have a 79 930. I am going through the motor after a spun rod bearing.

It is efi, twin plug, and when it goes back together twin turbo.

I was thinking of changing the pistons. Does anyone have a recommendation for me or should I just stay with the stock units.

Thanks

Ed
Old 10-30-2007, 06:03 PM
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Craig 930 RS's Avatar
 
Join Date: Sep 2003
Location: Kirkland, WA
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EFI? A no brainer - get 8.0:1 Mahles which can make it a 3.4L while you are at it.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 10-30-2007, 06:27 PM
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Ed,

Sorry to hear about the spun bearing.

Mine is EFI, twin plug twin turbo already using stock pistons (flame ringed as well). I put in Pauter rods last time though.

Next time I might go larger to 3.4, for lower end torque, but there's pleanty of power as is.....

What's the objective you're considering by using different pistons? Stock Mahle's are good, and with the lower/stock compression can give you some leeway to run higher boost.

Oh, I happen to have my old super 60's and waste gates in case you need a twin setup..... They achieved 530 HP to the wheels, so they're not too shabby.

Glenn
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Glenn
87' 930TT
Old 10-31-2007, 06:28 PM
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I have turbos and wategates. What do you have left over for plumbing though.

I am not too concerned about a bunch of boost. I am looking for more drivability and low end power. Looking for a little bump in compression to help that out.

My old twin plug efi setup (single turbo k27) put out around 450rwhp.

Would like to see a pic of your setup if you have one.

3.4's are so freegin expensive for only .1 L larger.

Thanks

Ed
Old 10-31-2007, 06:36 PM
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Sounds like you're set up well then with the toys.

Afraid I won't have much other plumbing to assist. I kept my old custom ss headers. I used a local fab shop to do some custom ss exhaust work, and they were a huge help. Oh, and I used a Dynaflo x-max muffler from Summit for $135 and it sounds great. Cheapest thing on the car.

I know waht you mean re cost of the 3.4's

What cams are you running?

I used to run Webcam 20/21's and now run the Evo GT2 cam. It added MUCH more to the lower end and didn't sacrifice anything from the top. Around town it drives like a torquey 3.2, instead of always needing boost for mino acceleration. Cam timing bumped can also really encourage that peppiness as opposed to a .1L bump.

I planned to post the upgrade with photos, and I'm doing final tweaking of the new EBC. Fun stuff. I upgraded to GT-series, and now have 2 additional oil cooling lines to them, and draining back into the lower valve covers. Tapping those freaked me out. Here's a sample:

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87' 930TT
Old 10-31-2007, 06:49 PM
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I am running the Mahle 3.4 with a 3.6 RSA crank it is making north of 550RWHP Pauter rods with the best internals available, the only things I would change are headers, currently B&B I would switch to Holcombe if he ever gets another worthy fabricator of Marco could make me a set after I put the vice to him at Rennsport.
Old 10-31-2007, 08:00 PM
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Purplehaze, did you bring your car to Porsche of fairfield about 2 years ago for a new windshield? If so, I apaligize for the drool marks and other residue I may have left on the car...
That, and I may be interested in your old turbo stuff. Let me know.
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Old 11-01-2007, 06:58 AM
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Mmmmm, 3.6 crank. yummy.

930gt, YES, that was mine! Small world, and MUCH better visibility. Oh, was that YOUR residue?
Let's chat about the turbos to see if they're for you. Just got your email.

G
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Glenn
87' 930TT
Old 11-01-2007, 07:09 AM
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Glen,

What size are your primary exhaust pipes?

Dan
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75 930, 76 930, 83 SC EFI turbo
Old 11-01-2007, 07:45 AM
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Dan,

They are 1-5/8", equal length from Protomotive.

Yours sounds like a nice rig.

G
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Glenn
87' 930TT
Old 11-01-2007, 10:56 AM
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