bad news boys.. motor is coming out again
#16
09-11-2009, 11:06 AM
Join Date: Jun 2007
Location: USA
Age: 54
Posts: 935
Rep Power: 90 
thanks for your input john and tony! this would have greatly influnced my decision to upgrade to the ARP studs... if there is no fix that does not require removing the motor a couple of times i will go back to the stock headstuds
**** anyone thinking of upgrading to ARP headstuds take this experience into account getting to the headstuds is not fun*****
**** anyone thinking of upgrading to ARP headstuds take this experience into account getting to the headstuds is not fun*****
I was going to ask the same question as John... In general, whether the direction say to or not. Aftermarket studs/bolts should be retourqued after 2 heat cycles and then again after some miles (1 track day or 1500 miles or so).
In many other engines we put together, we used to fight the same issue until we religiously started to do this....
In many other engines we put together, we used to fight the same issue until we religiously started to do this....
Last edited by colorinc; 09-11-2009 at 11:46 AM. Reason: mis type
#17
09-11-2009, 11:15 AM
Basic Sponsor
a handful of tuners that were building motors had similar problems over the last few years....
Tim... sorry to hear but I am sure you guys will knock it out...
mark
Tim... sorry to hear but I am sure you guys will knock it out...
mark
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
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50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
#18
09-11-2009, 11:20 AM
thanks for your input john and tony! this would have greatly influnced my decision to upgrade to the apr studs... if there is no fix that does not require removing the motor a couple of times i will go back to the stock headstuds
**** anyone thinking of upgrading to apr headstuds take this experience into account getting to the headstuds is not fun*****
**** anyone thinking of upgrading to apr headstuds take this experience into account getting to the headstuds is not fun*****
Yup, it can be a pain. In many of the other cars we work on (5 cylinder Audi, 2.7t Audi, 6 Cylinder BMW) its as easy as removing the valve cover and retourqing. Obviously not the case on a 996tt.
#19
09-11-2009, 11:31 AM
Sorry to hear Tim. We have used ARP Head Studs in tons of Japanese motors never with an incident. I would suggest calling ARP and reporting the problem and finding out the specs if they are different. Your tech up there is TOP NOTCH, so must be product related and bad luck 
While it is out, 3.8L stroker!!!!!!!
While it is out, 3.8L stroker!!!!!!!
#20
09-11-2009, 11:44 AM
Join Date: Jun 2007
Location: USA
Age: 54
Posts: 935
Rep Power: 90 Sorry to hear Tim. We have used ARP Head Studs in tons of Japanese motors never with an incident. I would suggest calling ARP and reporting the problem and finding out the specs if they are different. Your tech up there is TOP NOTCH, so must be product related and bad luck While it is out, 3.8L stroker!!!!!!!
While it is out, 3.8L stroker!!!!!!!tim
#23
09-11-2009, 05:20 PM
I would assume the 12mm studs also require re-torquing after a few heat cycles as well?
What a PITA to remove the motor just to torque the studs!!
What a PITA to remove the motor just to torque the studs!!
#27
09-11-2009, 09:22 PM
Sorry to hear about your problem Tim... Do you know what the tq setting was. I know there was a problem with a production lot of those studs but lifting a head a only 1.1 bar, or even 1.4 for that matter sounds a bit odd. Those boost levels would hardly be considered extreme. If I recall the box for my studs had a far lower tq setting printed on them than for my application. I pushed my car pretty hard on the dyno and we saw 1.8 bar a few times with no problems. We did about 30+ pulls at 1.6 as well. I have about a 1K miles on this setup with one roadcourse day as well and so far no issues at 1.6. I think if we tq'ed to the arp settings it would be a different story
... Do you know what the tq setting was. I know there was a problem with a production lot of those studs but lifting a head a only 1.1 bar, or even 1.4 for that matter sounds a bit odd. Those boost levels would hardly be considered extreme. If I recall the box for my studs had a far lower tq setting printed on them than for my application. I pushed my car pretty hard on the dyno and we saw 1.8 bar a few times with no problems. We did about 30+ pulls at 1.6 as well. I have about a 1K miles on this setup with one roadcourse day as well and so far no issues at 1.6. I think if we tq'ed to the arp settings it would be a different story
#28
09-11-2009, 09:30 PM
well, I am very sorry Tim...wish the best. If you are going to play in the "build leagues" (pun intended), you have to be ready to rip it apart more than once...it is a long and slippery slope...GL
