jumper5836

Nice, very good report considering the track time and power your putting out. I guess the removing the interlock earlier would have saved the wear? I heard about this from a 993turbo owner and now thinking I should do this now.

What about the chain, is it worn or stretched?

cbracerx

Excellent report. Do you have an idea how many track hours/days you had on the motor?
EDIT: "100+ track hours, 50K miles total..." (my bad for not re-reading the thread)

Curious about the thrust bearing wear. You usually see more wear on these in an air cooled motor also. I presume removing the interlock is to allow the motor to be started when in neutral with clutch engaged so there is no preload on the crank from the pressure plate? Might have to consider that change on my car also.

993GT

correct guys, removing the clutch interlock relieves thrust-related(from clutch) dry bearing cranking on fire-up ....very simple mod, did mine within 24hours of ownership...but remember there is liability involved, do at own risk.

powdrhound

Chain was fine but are getting replaced also.

powdrhound

Correct... ^

993GT

Agree, no-brainer to replace them. (Good to know the used ones are still in good condition though)
Going with OE or Motorsports?

kalyan

Any DIY link on how to do this? I "felt" last night that there are two switches when I push the clutch pedal.

thanks a lot!!

993GT

disconnect the 2 wires from the switch here, and reconnect the wires together(various ways)

kalyan

^^ Thanks, Rob!

powdrhound

Gearbox was reassembled with the new 997GT3 1-3 mainshaft and sealed up today. Since everything was apart, 4th gear synchros were changed also. From what I was told, everything looked to be in amazingly good shape considering the time and use. Very minimal wear on the synchros and only some pitting on one of the main bearing races. Third was starting to show some fatigue on a couple of the teeth even though my untrained eye could not spot anything. Evidently would have gone another track season.

Ken7258

Sorry about the slow reply but I don't frequent 6Speed much anymore so figured I would reply over here instead. For this video of his record lap of High Plains Raceway just by going with the description in the video he will be running 275 sized A6 or BFG-R1S. Weight says 2900 lbs with driver and 315 whp.
It seems at nationals at Sonoma he ran a smaller 245 sized Hoosier A7 to run less weight (2870 lbs) and more power (325 whp).
The best part about NASA is the potential contingency prizes in tires if there are enough competitors. Unfortunately TT1 being at the pointy end of the classing makes it hard for lots of competitors in class for the Rocky Mountain Region. Still fun to shoot for the TT1 and overall Nasa TT track record and get your name in the record book. Keep the updates coming!

oMenRC51

WTF are you talking about ^^^

"02996ttx50

^^^ lol

this is some great info and impressive numbers particularly PRE RE-Build! can't wait for the reportage on the upgrades! gl with them all, and thx for posting as always.

powdrhound

Heads are done.... Note how the stock intake manifold does not properly match up with the head. Todd went the extra step by match porting the intake manifold to the head for a seamless transition. You can also see how much thinner the intake manifold wall is after his port work as he opened it up to funnel more air directly to the head.

Anyone considering getting some Porsche headwork done, I would highly highly recommend Todd McKenzie. Turnaround time including shipping was a little over 2 weeks and I told Todd there is no need to rush it as I was out of town anyway. Todd said he can normally turn it in 1 week or so. I think the numbers speak for themselves. The % improvement over stock for both the intake and exhaust side is calculated in 0.050" increments and shown in the two columns on the far right. You can see a huge improvement in flow with an average intake improvement of 78.5% (27%min-120%max) and an average exhaust improvement of 68.7% (26%min-120%max). Keep in mind, valves are stock OEM size as we decided to stick with those as opposed to going bigger. Todd added his own springs, guides, etc..



Stock intake port
Stock Intake Port


Todd McKenzie intake port
Todd McKenzie Intake Port


Stock exhaust Port
Stock Exhaust Port


Todd McKenzie exhaust port
Todd McKenzie Exhaust Port








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blockhed

wow those look amazing...this thing will be a brand new car, I hope there will be a go pro set up to see your initial drive responses...giggling like a little girl