Question: Internal differences between a 996 Cup motor and stock 996 GT3
11-01-2018, 02:30 PM
#1
Drifting
Thread Starter
Question: Internal differences between a 996 Cup motor and stock 996 GT3
What are the specific differences in internal parts between a street 996 GT3 motor and a 996 Cup motor? Are there any interchangeable parts between them and if so, what percentage would that be? I do realize that some 996 Cup parts are NLA and might use 997 parts today but just asking as a general guide.
11-01-2018, 11:26 PM
#3
Originally Posted by claykos
Almost no difference. 996 cup is a street engine with different cams (no variable timing),
11-03-2018, 02:34 AM
#5
RL Community Team
Rennlist Member
Rennlist Member
Curious to know what the performance advantage of non variable cams in the cup car brings. Is it purely longevity? I’ve had both 6 cup and 6 GT3 and the power band between the two is significantly different in my experience.
11-03-2018, 03:57 AM
#6
Much of the power band differences are with the cup transmission’s gear ratios versus the street cars.
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11-03-2018, 03:13 PM
#8
A cup motor idles at about 2k rpm and is never intended to run below around 4500-5000 if driven properly. So no need for the variable timing like the street cars which have to idle with the A/C on in traffic.
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MC 968CS (05-03-2024)
05-04-2024, 09:17 AM
#11
Rennlist Member
05-05-2024, 08:42 PM
#12
RSR:
Yes, my 2001 ex SuperCup had a factory Motorsport flash that added 10 hp and required 100 octane race gas. Even so, my guess is that this did not effect the idle RPM. I say that because a buddy who had both a 2001 and a 1999 Cup (first year) had his cars idling at about 1000 rpm.
RSR, you raise an interesting question, any Rennlisters out there have Cups, probably earlier generations, that idle around 1000 RPM?
Ted
Yes, my 2001 ex SuperCup had a factory Motorsport flash that added 10 hp and required 100 octane race gas. Even so, my guess is that this did not effect the idle RPM. I say that because a buddy who had both a 2001 and a 1999 Cup (first year) had his cars idling at about 1000 rpm.
RSR, you raise an interesting question, any Rennlisters out there have Cups, probably earlier generations, that idle around 1000 RPM?
Ted