[Z06] Against the grain
#343
Le Mans Master
Thread Starter
After about 3 months of no word from Pat G, I decided to hit him up again. My e-mail fell through the cracks, understandable since he is so busy and I wasn't in a hurry. After a few questions, he sent me my specs. The cam he spec'd is pretty similar to the B3 I am running now, but different valve events to build some cylinder pressure and different lobes. I asked for more torque, same peak rpm, and similar or better peak HP. He pretty much hit the nail on the head. Excited to put this cam in and see what it does. It won't be soon, as I still want to get 2" headers, vacuum pump, and an electric water pump first. I likely won't have apples to apples before and afters with these parts. I will be installing them all at the same time to minimize dyno time.
Last edited by jayyyw; 08-14-2018 at 11:51 AM.
#344
Do you mind sharing what lobes and the valve evens? Really just curious if he choose the same lobes that I am using LSL/LXL. My car is going back to my tuner today for cam, head gaskets, E85 conversion, etc.. and I should have it back in a few weeks. Tell me more about the Vacuum pump. I see some of you guys using them and I don't really know why.
Last edited by lamboworld; 08-14-2018 at 01:16 PM.
#345
Melting Slicks
Member Since: Jun 2005
Location: Rochester NY
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2018 C6 of Year Finalist
St. Jude Donor '10, '17
Nice. Glad he came through. I'm very happy with the cam he spec'd for me. It quite literally did exactly what he predicted.
What vacuum pump are you going to use?
What vacuum pump are you going to use?
#346
After about 3 months of no word from Pat G, I decided to hit him up again. My e-mail fell through the cracks, understandable since he is so busy and I wasn't in a hurry. After a few questions, he sent me my specs. The cam he spec'd is pretty similar to the B3 I am running now, but different valve events to build some cylinder pressure and different lobes. I asked for more torque, same peak rpm, and similar or better peak HP. He pretty much hit the nail on the head. Excited to put this cam in and see what it does. It won't be soon, as I still want to get 2" headers, vacuum pump, and an electric water pump first. I likely won't have apples to apples before and afters with these parts. I will be installing them all at the same time to minimize dyno time.
#347
Le Mans Master
Thread Starter
Do you mind sharing what lobes and the valve evens? Really just curious if he choose the same lobes that I am using LSL/LXL. My car is going back to my tuner today for cam, head gaskets, E85 conversion, etc.. and I should have it back in a few weeks. Tell me more about the Vacuum pump. I see some of you guys using them and I don't really know why.
IVO is 10.5 ° BTDC ( - indicates ATDC)
IVC is 52.5 ° ABDC
EVO is 66.0 ° BBDC
EVC is 12.0 ° ATDC ( - indicates BTDC)
Overlap is 22.5 °
Pat G cam:
IVO is 14.5 ° BTDC ( - indicates ATDC)
IVC is 48.5 ° ABDC
EVO is 64.5 ° BBDC
EVC is 14.5 ° ATDC ( - indicates BTDC)
Overlap is 29 °
As far as the lobes, all he said was that they are custom TSP370 lobes. .370 lobe lift which is .666 with the 1.8 rocker ratio.
The vacuum pump helps evacuate positive pressure in the crankcase. This helps the rotating assembly spin with less resistance, can help rings seal against the cylinders better (especially if you use low tension rings), and helps make more power in the upper rev range. The higher you spin the motor the more it helps.
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dmartens (10-27-2018)
#348
Le Mans Master
Thread Starter
I will be using the GZ Sportsman with the LS kit. Seems to be working well for the guys that run it.
#349
Le Mans Master
Thread Starter
I've heard nothing but great things about Pat G in regards to his tuning and cam spec'ing abilities. Fortunately, I have a solid tuner already so, no, I won't be using anyone else to continue tuning my car.
#350
#352
Melting Slicks
Tuners who spec cams is where it's at. They have seen so much that they know what works and what doesn't.
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jayyyw (08-14-2018)
#353
Melting Slicks
I think the new cam might be 58 degrees ABDC on the intake closing to get the 29 degrees of overlap unless I am doing something wrong. I am coming up with 243 degrees on the intake on both I though somewhere you were 251 on the new one.
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jayyyw (08-15-2018)
#360
Burning Brakes
RPM B3 valve events:
IVO is 10.5 ° BTDC ( - indicates ATDC)
IVC is 52.5 ° ABDC
EVO is 66.0 ° BBDC
EVC is 12.0 ° ATDC ( - indicates BTDC)
Overlap is 22.5 °
Pat G cam:
IVO is 14.5 ° BTDC ( - indicates ATDC)
IVC is 48.5 ° ABDC
EVO is 64.5 ° BBDC
EVC is 14.5 ° ATDC ( - indicates BTDC)
Overlap is 29 °
As far as the lobes, all he said was that they are custom TSP370 lobes. .370 lobe lift which is .666 with the 1.8 rocker ratio.
The vacuum pump helps evacuate positive pressure in the crankcase. This helps the rotating assembly spin with less resistance, can help rings seal against the cylinders better (especially if you use low tension rings), and helps make more power in the upper rev range. The higher you spin the motor the more it helps.
IVO is 10.5 ° BTDC ( - indicates ATDC)
IVC is 52.5 ° ABDC
EVO is 66.0 ° BBDC
EVC is 12.0 ° ATDC ( - indicates BTDC)
Overlap is 22.5 °
Pat G cam:
IVO is 14.5 ° BTDC ( - indicates ATDC)
IVC is 48.5 ° ABDC
EVO is 64.5 ° BBDC
EVC is 14.5 ° ATDC ( - indicates BTDC)
Overlap is 29 °
As far as the lobes, all he said was that they are custom TSP370 lobes. .370 lobe lift which is .666 with the 1.8 rocker ratio.
The vacuum pump helps evacuate positive pressure in the crankcase. This helps the rotating assembly spin with less resistance, can help rings seal against the cylinders better (especially if you use low tension rings), and helps make more power in the upper rev range. The higher you spin the motor the more it helps.
I'm trying 15.5/53.5 on my Hi-Ram combo and see how that works out. If does not performs as expected (very subjective) then I have another grind to toy with.
The vacuum pump and EWP will contribute to it for sure!