Which(size & brand) cams are you running with your ported head?
Apr 3, 2007, 11:10 AM
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Which(size & brand) cams are you running with your ported head?
I've been hearing that sometimes 280 cams do not work very well with ported head (ruff idling, not making more power/torque, etc.)
Please specify Evo 7/8/9, supporting mods, which size(stock, 272, 280 etc.) / brand (HKS, revolver, etc.) cams you are running with your ported head.
Last but not least, if you have dyno number, please those as well.
Thanks, folks. Looking forward to hearing from you.
Please specify Evo 7/8/9, supporting mods, which size(stock, 272, 280 etc.) / brand (HKS, revolver, etc.) cams you are running with your ported head.
Last but not least, if you have dyno number, please those as well.
Thanks, folks. Looking forward to hearing from you.
Apr 3, 2007, 03:56 PM
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I run HKS 280 cams at +2/0 with an AMS VSR intake, 50 trim, and ported head. Lost a bit of initial torque with the ported head, but gained more power up top.
l8r)
l8r)
Last edited by Ludikraut; Apr 18, 2007 at 10:59 PM. Reason: Posted incorrect information
Apr 4, 2007, 10:02 AM
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The effects of certain modifications on my car were as follows:
1.) Stock head, Stock Intake, 50 trim - earliest spoolup, good initial torque, not the greatest topend
2.) Stock head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than stock intake/head, makes about the same initial torque, added anywhere from 20-30 wtq across the power band, added ~35whp @ 7000 rpm
3.) Ported head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than the stock intake/head, makes 20 ft-lbs less torque intially than the VSR intake with stock head, starts making the same power at ~5000 RPM and then ends up making 10 whp more at 7000 RPM. It's interesting to note that with this combo on my car peak torque is at 7000 RPM.
I actually did not want to go with the ported head, but the car developed 2 bad valves on the original head, so I said f*ck it. One of the few mods that I'm really not sure how I feel about. On the one hand it sucks to lose that much torque down low, but on the other hand with that much power on tap, the smaller initial 'hit' isn't such a bad thing - and when I'm road racing it, I try to never let the RPM drop below 4000-4500 anyways...
I have my idle target set to 1100 RPM. The actual idle generally varies from 900 - 1300 RPM. With the larger injectors (780cc) it's not as stable as I'd like it to be ... I think I can get it to idle 100% with some more tweaking. Right now, though it'll catch an occasional rich spike, which has a tendency to start making the idle fluctuate, which on occasion will stall the car. Also, with the larger TB, Exedy twin metallic and the larger injectors, it is very difficult to drive the car in a stop-n-go situation. I've learned how to do it, but so far everyone that has tried to drive the car has stalled it on the first try and then some.
l8r)
1.) Stock head, Stock Intake, 50 trim - earliest spoolup, good initial torque, not the greatest topend
2.) Stock head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than stock intake/head, makes about the same initial torque, added anywhere from 20-30 wtq across the power band, added ~35whp @ 7000 rpm
3.) Ported head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than the stock intake/head, makes 20 ft-lbs less torque intially than the VSR intake with stock head, starts making the same power at ~5000 RPM and then ends up making 10 whp more at 7000 RPM. It's interesting to note that with this combo on my car peak torque is at 7000 RPM.
I actually did not want to go with the ported head, but the car developed 2 bad valves on the original head, so I said f*ck it. One of the few mods that I'm really not sure how I feel about. On the one hand it sucks to lose that much torque down low, but on the other hand with that much power on tap, the smaller initial 'hit' isn't such a bad thing - and when I'm road racing it, I try to never let the RPM drop below 4000-4500 anyways...
I have my idle target set to 1100 RPM. The actual idle generally varies from 900 - 1300 RPM. With the larger injectors (780cc) it's not as stable as I'd like it to be ... I think I can get it to idle 100% with some more tweaking. Right now, though it'll catch an occasional rich spike, which has a tendency to start making the idle fluctuate, which on occasion will stall the car. Also, with the larger TB, Exedy twin metallic and the larger injectors, it is very difficult to drive the car in a stop-n-go situation. I've learned how to do it, but so far everyone that has tried to drive the car has stalled it on the first try and then some.
l8r)
Apr 4, 2007, 10:03 AM
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On stock injectors, HKS 280s should have no problem idling stable. Set the idle target values in your ECU to about 1100 (don't monkey with the BISS), and it should be fine.
l8r)
l8r)
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Apr 9, 2007, 06:22 AM
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Cam specs thread. Has all cam dimensional info compiled in one location.
-Paul
Apr 9, 2007, 11:51 AM
#13
The effects of certain modifications on my car were as follows:
1.) Stock head, Stock Intake, 50 trim - earliest spoolup, good initial torque, not the greatest topend
2.) Stock head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than stock intake/head, makes about the same initial torque, added anywhere from 20-30 wtq across the power band, added ~35whp @ 7000 rpm
3.) Ported head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than the stock intake/head, makes 20 ft-lbs less torque intially than the VSR intake with stock head, starts making the same power at ~5000 RPM and then ends up making 10 whp more at 7000 RPM. It's interesting to note that with this combo on my car peak torque is at 7000 RPM.
I actually did not want to go with the ported head, but the car developed 2 bad valves on the original head, so I said f*ck it. One of the few mods that I'm really not sure how I feel about. On the one hand it sucks to lose that much torque down low, but on the other hand with that much power on tap, the smaller initial 'hit' isn't such a bad thing - and when I'm road racing it, I try to never let the RPM drop below 4000-4500 anyways...
I have my idle target set to 1100 RPM. The actual idle generally varies from 900 - 1300 RPM. With the larger injectors (780cc) it's not as stable as I'd like it to be ... I think I can get it to idle 100% with some more tweaking. Right now, though it'll catch an occasional rich spike, which has a tendency to start making the idle fluctuate, which on occasion will stall the car. Also, with the larger TB, Exedy twin metallic and the larger injectors, it is very difficult to drive the car in a stop-n-go situation. I've learned how to do it, but so far everyone that has tried to drive the car has stalled it on the first try and then some.
l8r)
1.) Stock head, Stock Intake, 50 trim - earliest spoolup, good initial torque, not the greatest topend
2.) Stock head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than stock intake/head, makes about the same initial torque, added anywhere from 20-30 wtq across the power band, added ~35whp @ 7000 rpm
3.) Ported head, AMS VSR intake, 65mm TB, 50 trim - spools ~200 RPM later than the stock intake/head, makes 20 ft-lbs less torque intially than the VSR intake with stock head, starts making the same power at ~5000 RPM and then ends up making 10 whp more at 7000 RPM. It's interesting to note that with this combo on my car peak torque is at 7000 RPM.
I actually did not want to go with the ported head, but the car developed 2 bad valves on the original head, so I said f*ck it. One of the few mods that I'm really not sure how I feel about. On the one hand it sucks to lose that much torque down low, but on the other hand with that much power on tap, the smaller initial 'hit' isn't such a bad thing - and when I'm road racing it, I try to never let the RPM drop below 4000-4500 anyways...
I have my idle target set to 1100 RPM. The actual idle generally varies from 900 - 1300 RPM. With the larger injectors (780cc) it's not as stable as I'd like it to be ... I think I can get it to idle 100% with some more tweaking. Right now, though it'll catch an occasional rich spike, which has a tendency to start making the idle fluctuate, which on occasion will stall the car. Also, with the larger TB, Exedy twin metallic and the larger injectors, it is very difficult to drive the car in a stop-n-go situation. I've learned how to do it, but so far everyone that has tried to drive the car has stalled it on the first try and then some.
l8r)
