anybody here runing the 2.8 Intake cams

Johnny Bravo · 10-11-2005, 09:26 AM

Ochlockonee · 10-11-2005, 09:37 AM

I calculated volumetric efficiency one day when I was really bored. I came up with 88-92% VE with these cams at 13 psi and 6500 rpm. That was with stock intake and TB.

Arcteryx::Stock Rods · 10-11-2005, 09:42 AM

what why wouldn't your car haul ass with 2.8 cams?

thanks

Arcteryx::Stock Rods · 10-11-2005, 09:59 AM

http://forums.audiworld.com/s4/msgs/2133949.phtml

Ochlockonee · 10-11-2005, 10:03 AM

You get almost no extra overlap compared to the stock cams, which is good, but the boost gets pushed right back out the intake valve at lower rpms because the intake valve closes so much later. At high rpms the car runs great, but midrange torque suffers too much to make this a good street cam. There is more torque off boost with 2.8 cams, so boost comes in a bit earlier. That's pretty much all I miss about them.
I would recommend these cams for a car that spends a LOT of time on the track and frequently sees the redline. They would work even better on a track whore that has a short ratio gearbox.

Todeshandler · 10-11-2005, 10:04 AM

just get deleted. And on top of that. The cams aren't available to the public yet.... So no it doesn't sound familiar.

Arcteryx::Stock Rods · 10-11-2005, 10:08 AM

Johnny Bravo · 10-11-2005, 10:09 AM

Todeshandler · 10-11-2005, 10:09 AM

Arcteryx::Stock Rods · 10-11-2005, 10:10 AM

10-11-2005, 09:26 AM	#1
Johnny Bravo AudiWorld Super User Account #: 6784 Join Date: Jun 2000 Posts: 5,384	anybody here runing the 2.8 Intake cams __________________ Aim: Johnaudi mail: Johnaudi / Aol.Com

10-11-2005, 09:37 AM	#2
Ochlockonee Member Account #: 72863 Join Date: Mar 2004 Posts: 2,953	I was until recently. Anything you want to know? I calculated volumetric efficiency one day when I was really bored. I came up with 88-92% VE with these cams at 13 psi and 6500 rpm. That was with stock intake and TB. __________________ "No, a flux capacitor is not compatible with a ham sandwich."

10-11-2005, 09:42 AM	#3
Arcteryx::Stock Rods Senior Member Account #: 70072 Join Date: Feb 2004 Posts: 8,197	were you using stock s4 heads as well? what made you go back to stock? and what why wouldn't your car haul ass with 2.8 cams? thanks __________________ Bored 2.8/9.1CR JE Pistons/034 Rods/RS4 Heads KO4's Port Polished/VAST Meth Injection RS4 Intake Manifold/Throttle Body X-1 Intake/ER IC's ASP Exhaust Heads to Tips Clutchmaster Stage IV with LWFW STaSIS Ohlins 700/800 AWE DTS Alcons 355 6 Piston BBK

10-11-2005, 09:59 AM	#4
Arcteryx::Stock Rods Senior Member Account #: 70072 Join Date: Feb 2004 Posts: 8,197	sound familiar? http://forums.audiworld.com/s4/msgs/2133949.phtml __________________ Bored 2.8/9.1CR JE Pistons/034 Rods/RS4 Heads KO4's Port Polished/VAST Meth Injection RS4 Intake Manifold/Throttle Body X-1 Intake/ER IC's ASP Exhaust Heads to Tips Clutchmaster Stage IV with LWFW STaSIS Ohlins 700/800 AWE DTS Alcons 355 6 Piston BBK

10-11-2005, 10:03 AM	#5
Ochlockonee Member Account #: 72863 Join Date: Mar 2004 Posts: 2,953	2.8 cams suck for boost. The valve is open too long during the compression stroke. You get almost no extra overlap compared to the stock cams, which is good, but the boost gets pushed right back out the intake valve at lower rpms because the intake valve closes so much later. At high rpms the car runs great, but midrange torque suffers too much to make this a good street cam. There is more torque off boost with 2.8 cams, so boost comes in a bit earlier. That's pretty much all I miss about them. I would recommend these cams for a car that spends a LOT of time on the track and frequently sees the redline. They would work even better on a track whore that has a short ratio gearbox. __________________ "No, a flux capacitor is not compatible with a ham sandwich."

10-11-2005, 10:04 AM	#6
Todeshandler Member Account #: 71856 Join Date: Mar 2004 Posts: 5,699	No because there is a difference. We are not an advertiser here yet.... so if I post it, it will just get deleted. And on top of that. The cams aren't available to the public yet.... So no it doesn't sound familiar. __________________

10-11-2005, 10:08 AM	#7
Arcteryx::Stock Rods Senior Member Account #: 70072 Join Date: Feb 2004 Posts: 8,197	i was just mess'n with ya ;P __________________ Bored 2.8/9.1CR JE Pistons/034 Rods/RS4 Heads KO4's Port Polished/VAST Meth Injection RS4 Intake Manifold/Throttle Body X-1 Intake/ER IC's ASP Exhaust Heads to Tips Clutchmaster Stage IV with LWFW STaSIS Ohlins 700/800 AWE DTS Alcons 355 6 Piston BBK

10-11-2005, 10:09 AM	#8
Johnny Bravo AudiWorld Super User Account #: 6784 Join Date: Jun 2000 Posts: 5,384	how did you come up with the figures? __________________ Aim: Johnaudi mail: Johnaudi / Aol.Com

10-11-2005, 10:09 AM	#9
Todeshandler Member Account #: 71856 Join Date: Mar 2004 Posts: 5,699	I know :) I just explained it for those that didn't know you were kidding around ;) __________________

10-11-2005, 10:10 AM	#10
Arcteryx::Stock Rods Senior Member Account #: 70072 Join Date: Feb 2004 Posts: 8,197	thanks for getting back to me......so you wouldn't recommend these even if you had 2.8 heads? __________________ Bored 2.8/9.1CR JE Pistons/034 Rods/RS4 Heads KO4's Port Polished/VAST Meth Injection RS4 Intake Manifold/Throttle Body X-1 Intake/ER IC's ASP Exhaust Heads to Tips Clutchmaster Stage IV with LWFW STaSIS Ohlins 700/800 AWE DTS Alcons 355 6 Piston BBK

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