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Pfitzner dog box internals for R33???

Chris Wilson
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Chris Wilson Proficient

Chris Wilson

Posted
Posted

Anyone using Pfitzner dog box internals in an R33 GTR / GTS-t casing? Independent opinions as to fit, quality, torque handling capacity, car usage et cetera welcome :) My mails to Pfitzner have been replied to slightly ambiguously, I am FAIRLY sure they do dog as well as synchro straight cut internal gear sets...

Thanks.

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https://www.sau.com.au/forums/topic/71502-pfitzner-dog-box-internals-for-r33/
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Sydneykid Grand Master

Sydneykid

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Hi Chris, if I remember rightly Theo uses a PPG dog box in his GTR for drag racing, mid 9's on radials. We use PPG dog boxes in the ciruit race cars, no problems after 2 years. Usual dog maintenance only. We are at 420+rwkw (around 650 bhp) from a 3.1 litre RB30/26. So it has LOTS of torque, way over 700 ft lbs at the flywheel.;)

DoughBoy Veteran

DoughBoy

Posted
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I doubt Keir has done 60+ passes on the PPG, iirc that's the one of the first outings with the new gearbox. Last year he was running an OS6, and the year before the Hollinger.

Until there are more PPG units out in circulation I think it's a bit soon to be coming to any conclusions, especially in street/drag cars.

SydneyKid - Do you guys use the PPG's in 4WD as well as your 2WD? What ratio's in the box and diff, and what tires? What clutch setup?

Sydneykid Grand Master

Sydneykid

Posted
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I doubt Keir has done 60+ passes on the PPG, iirc that's the one of the first outings with the new gearbox. Last year he was running an OS6, and the year before the Hollinger.

Until there are more PPG units out in circulation I think it's a bit soon to be coming to any conclusions, especially in street/drag cars.

SydneyKid - Do you guys use the PPG's in 4WD as well as your 2WD? What ratio's in the box and diff, and what tires? What clutch setup?

There is 1 X PPG 5 Speed dog box in the 2wd with 4.3 diff ratio. The clutch is an OS Giken twin plate. It runs on 245/45/17 Yokohama A032R's. This box is farely new, it has only done 2.5 hours, that's a bit over 6,000 gear changes. The ratios are 2.621 / 1.637 / 1.240 / 1.000 / 0.839.

There is 1 X PPG 5 Speed dog box in the 4wd with 4.1 diff ratios. The clutch is an OS Giken triple plate. The ATTESSA has extra clutches as well as electronic torque split and launch. It also runs on 245/45/17 Yokohama A032R's. We have used A048R's on it for testing as well. This one has done nearly a full year of racing, that's 160 starts, 10 hours of racing and 25,000 or so gearchanges. It was serviced last year, just the usual bearings, dog engagement and seals replaced. Same as we do with the Hollingers in the V8Supercars. Sorry but I can't tell you the ratios in this box, but they are different to the 2wd above.

We also have a PPG 5 Speed dog box in the RX7, it has a Tilton 7" triple plate and a 5.3 diff ratio. We alternate between the PPG and the Modena as the gearing suites different circuits. For example we use the PPG at Wakefield Park, and Sandown and the Modena at Philip Island. The ratios are 2.527 / 1.805 / 1.381 / 1.155 / 1.000

Hope that helps:cheers:

Sydneykid Grand Master

Sydneykid

Posted
Posted
Thanks for the info. What sort of weights are you guys at, I'm assuming they are both R32s? Does the 2WD use an RB25 box?

Sorry I can't tell you the weight of the GTR, competitive advantage......you understand...

The R32GTST runs an R33 GTST RB25DET gearbox. It weighs 1195 kgs currently, but is getting a new chrome molly cage, so that will go up 30 or so kgs.:cheers:

SK what sort of service work is required for the dog boxes and are the dog rings a press/spline fit on the side of the mainshaft gears ?

Cheers A .

Honestly I have no idea, we don't service the PPG or Modena gearboxes in house. They go back to them for their scheduled servicing. We haven't broken one, so I haven't had to pull it down at a race meeting to find out/fix it. We did break a shifter on the RX7 Modena at Philip Island and Rowan turned up with a replacement in a couple of hours. That's what I call service!

:cheers:

Sydneykid Grand Master

Sydneykid

Posted
Posted
Sk is that your GTR in the photo?

If by "yours" you mean "drive", Phil Coles drives the Production R32GTR for the race team, and Dave Loftus drives the team Improved Production R32GTR.

is that a vn commodore behind ur car?

That is the Production R32GTR N1, there is also an Improved Production R32GTR painted very similarly (same sponsor and car owner). So yes, that is a VN Commondoor, behind where it belongs.

Pop out to a round of the NSW State Championships and say hello.

:rofl:

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