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944-SPEC
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Which 944 transaxles are class legal?
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TOPIC: Which 944 transaxles are class legal?

Re: Which 944 transaxles are class legal? 8 years ago #21404

I note that the rule says that the differentials are "free". Does that mean that if we choose to we could use an aftermarket limited slip differential? Probably more expensive than an OEM one I realize just thinking out loud as it were.
NASA SE Grid monkey extrordinaire
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Re: Which 944 transaxles are class legal? 8 years ago #21406

  • cbuzzetti
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Yes you can use any limited slip. If you don't already have the short 5th gear you will want that too.

Multiple national championships were won with a product called Phantom Grip. It is an add on you can install on an open diff. Not as good as a full LSD but it won a lot of races.

Lots of parts are still available to rebuild the stock LSD. These are actually a trans used in Audis.
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Re: Which 944 transaxles are class legal? 8 years ago #21407

  • cgktexas
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cbuzzetti wrote:

Multiple national championships were won with a product called Phantom Grip. It is an add on you can install on an open diff. Not as good as a full LSD but it won a lot of races.


For those who are running the Phantom Grip, anyone experiencing damage, either to the PG, spider gears, or transx? How much metal are you finding in your fluid?

I have been saving up for a guards or os giken LSD, but had considered a PG insert at one point.
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Last Edit: 8 years ago by cgktexas.
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Re: Which 944 transaxles are class legal? 8 years ago #21408

  • cbuzzetti
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I raced the #999 car with the PG for 3 years with no issues. It was in the car when I bought it and I believe Tyler Palmer raced that car an additional 3 years with the PG.

Not as good as the Guards but good enough for 3 National Championships.
2018 NASA 944Spec National Champ
2018 NASA ST5 P2 944 Nationals COTA
2017 NASA 944Spec WSC P3
2016 NASA PTD-944 WSC P2
2015 NASA GTS1 Western Champion
2014 NASA 944Spec Western Champion
2013 NASA 944Spec So-Cal Regional Champion
2013 NASA 944Spec National P3
2010 NASA GTS-1 National Champion
2010 NASA 944Spec National P3
2010 NASA So-Cal 944Spec Regional Champion
2009 NASA 944Spec National Champion
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Re: Which 944 transaxles are class legal? 8 years ago #21409

  • AgRacer
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Thanks for reminding me about the name of Phantom Grip! I remember seeing it on here a couple years ago but couldn't remember when I was searching for LSD options the other day for a new car I am building.

Tuning of the LSD arguably has the most impact on the performance of the car. There's a reason other classes limit the LSD in breakaway torque and type.
J. Stanley
NASA-SE Region 944 Spec Series Director
Yellow #60
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