Schrick camshaft
- Thread starter ST.Phase
- Start date
Re: Schrick camshaft
You need at least duration@lift, lift, phasing, and preferably cam factor, for both stock, and aftermarket cam, to make any kind of informed decision.
Auto cars are the worst type of cars to put cams in - cams that shift power up the RPM band. You can't shift stall speed to match without lots of money. On a manual car you just rev it higher and let the clutch out there.. and even that is not practical for a city driving / commuter car. IMO, only if you are prepared to make sacrifices for speed and you regularly use it (track), should you spend time on all this.
With all the variance in power that people are reporting in power even with installation of the same cams (some even lose power), installation by different workshops, there is much to lose, little to gain.
You need at least duration@lift, lift, phasing, and preferably cam factor, for both stock, and aftermarket cam, to make any kind of informed decision.
Auto cars are the worst type of cars to put cams in - cams that shift power up the RPM band. You can't shift stall speed to match without lots of money. On a manual car you just rev it higher and let the clutch out there.. and even that is not practical for a city driving / commuter car. IMO, only if you are prepared to make sacrifices for speed and you regularly use it (track), should you spend time on all this.
With all the variance in power that people are reporting in power even with installation of the same cams (some even lose power), installation by different workshops, there is much to lose, little to gain.
piggyboyz
Core Group Members
Re: Schrick camshaft
Schrik 264/248 is the mildest for 330i. The other one they have is 270, which is meant for race IMO.
330i is running on 246 for the intake. The ZHP model is slightly more aggresive at 256 or 252 if i remember correctly, with a longer duration.
Re-programming is a must to harness the benefit of the cams.
Schrik 264/248 is the mildest for 330i. The other one they have is 270, which is meant for race IMO.
330i is running on 246 for the intake. The ZHP model is slightly more aggresive at 256 or 252 if i remember correctly, with a longer duration.
Re-programming is a must to harness the benefit of the cams.
Racebred
Core Group Members
Re: Schrick camshaft
For people who have done piggyback tuning, you know that the amount of air and fuel are changed to maximise power. Those programs or programmers powerful enough to tweak VANOS can simulate changes in lift and durations via the VANOS cam position actuators. This gives the car an improvement in the effects of better low end torque and better high end power, as it's continuously variable.
however, there's a limit to how much the acutators can mimic a more aggressive valve timing. That's where cams upgrade comes in. With a more aggressive profile, coupled with proper tuning to harness it, you can get better performance as the parameters are stretched further with the help of hardware changes instead of purely software.
As a comparison, i had done an A-B-A experiment with my ZHP cams. (which is a bloody costly experiment coz the gaskets need to be changed too) It netted a dynoed 10bhp difference, BEFORE any tuning (i did reset my DME adaptations though). I bought the ZHP cams through PML parts dept, for i think close to 2k, from my memory. This is my personal experience. There are a few others here, however, with vastly different experiences too.
As long as you dont touch race cams, one wouldnt expect to be in the rough-idling, high-revving, no low-end pull territory.
For people who have done piggyback tuning, you know that the amount of air and fuel are changed to maximise power. Those programs or programmers powerful enough to tweak VANOS can simulate changes in lift and durations via the VANOS cam position actuators. This gives the car an improvement in the effects of better low end torque and better high end power, as it's continuously variable.
however, there's a limit to how much the acutators can mimic a more aggressive valve timing. That's where cams upgrade comes in. With a more aggressive profile, coupled with proper tuning to harness it, you can get better performance as the parameters are stretched further with the help of hardware changes instead of purely software.
As a comparison, i had done an A-B-A experiment with my ZHP cams. (which is a bloody costly experiment coz the gaskets need to be changed too) It netted a dynoed 10bhp difference, BEFORE any tuning (i did reset my DME adaptations though). I bought the ZHP cams through PML parts dept, for i think close to 2k, from my memory. This is my personal experience. There are a few others here, however, with vastly different experiences too.
As long as you dont touch race cams, one wouldnt expect to be in the rough-idling, high-revving, no low-end pull territory.
Re: Schrick camshaft
Valvetronic is variable lift hence variable duration due to that change but not variable outside of that (lobe limited in a sense). VANOS is variable cam phasing - duration and lift are fixed, only phasing is changed.
I think this is too general a statement, RB. There are many sub-race cams that while not totally destroying the low end, do compromise it significantly. The consumer has to be made aware of this potentially weakening of the zone that they drive in everyday.
Your cam may be fine, but others between your cam and race cam may not. This Schrick cam may be fine too, but because there are no users who report experience (like you and your ZHP cam), no real cam spec, and a large variance in installation accuracy (hence result) between workshops, it is still something I would advise against. Too much to lose, for too little a gain IMO.
Racebred said:
Valvetronic is variable lift hence variable duration due to that change but not variable outside of that (lobe limited in a sense). VANOS is variable cam phasing - duration and lift are fixed, only phasing is changed.
I think this is too general a statement, RB. There are many sub-race cams that while not totally destroying the low end, do compromise it significantly. The consumer has to be made aware of this potentially weakening of the zone that they drive in everyday.
Your cam may be fine, but others between your cam and race cam may not. This Schrick cam may be fine too, but because there are no users who report experience (like you and your ZHP cam), no real cam spec, and a large variance in installation accuracy (hence result) between workshops, it is still something I would advise against. Too much to lose, for too little a gain IMO.
Re: Schrick camshaft
Nope, they will remain exactly the same. What is changing is the phasing of the lobe.
Intake valve opens 30 BTDC, closes 30 ATDC - duration is 30+180+30=240 degrees.
VANOS retards intake cam at higher RPM to shift intake valve closing point to a point where inertia of air column at that nominal port speed is better, so now...
Intake valve opens 10 BTDC, closes 50 ATDC - duration is still 10+180+50=240 degrees.
The duration and lift is fixed by the lobe.
Racebred said:
Nope, they will remain exactly the same. What is changing is the phasing of the lobe.
Intake valve opens 30 BTDC, closes 30 ATDC - duration is 30+180+30=240 degrees.
VANOS retards intake cam at higher RPM to shift intake valve closing point to a point where inertia of air column at that nominal port speed is better, so now...
Intake valve opens 10 BTDC, closes 50 ATDC - duration is still 10+180+50=240 degrees.
The duration and lift is fixed by the lobe.
