280 vs 272
05-EVO-GSR, your car is performing quite well and those numbers are solid for a car with your configuration and good tuning.
If you had left the comparison list up there, you'd see that once you reach the point where you are (about 100whp or so more than stock as measured with a DJ dyno), it takes a good deal more effort and expense to get another 50whp or so from the 16G, and that represents the differences between our respective cars. The point where you are now pretty much represents a threshold of sharply diminishing returns, where beyond that, you'll see smaller gains per dollar spent.
If you had left the comparison list up there, you'd see that once you reach the point where you are (about 100whp or so more than stock as measured with a DJ dyno), it takes a good deal more effort and expense to get another 50whp or so from the 16G, and that represents the differences between our respective cars. The point where you are now pretty much represents a threshold of sharply diminishing returns, where beyond that, you'll see smaller gains per dollar spent.
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From: Jeffersonville, IN / Louisville KY
Originally Posted by evo3matt
272s vs 280s, GSC vs. HKS, New vs. Used.
Is anyone else having a hard time deciding
Is anyone else having a hard time deciding
Originally Posted by Ted B
My 280s set at +2/0 (don't try this without expert tuning) spool as quickly as my 272s did at -3/-3, both configurations reaching full boost by 3500rpm with a TME 16G Ti/Al turbo.
- However -
With the 280s I made 30 ft/lbs greater torque than with the 272s, reached peak torque ~200rpm quicker, with no change in boost pressure. This is probably more reflective of the cam timing than the cams, but the point is I definitely didn't lose any torque by going to the 280s, so the notion that one loses torque with the 280s is baseless and is dependent upon tuning accuracy and other factors.
Despite the advanced cam timing with the 280s, I reached peak power at 6400 rpm, just as I did with the 272s set at -3/-3. The difference is I made 16whp more with the 280s, again with no change in boost pressure.
Note: This was all done with a Dyno Dynamics dyno, so tack on another 12-15% to those differences for Dynojet numbers.
I did however install a new IC at the same time as the HKS 280s, so maybe there is some difference there, but from what I've seen, most of the observed difference is due to the cams, the timing thereof, the capability of the tuning hardware, and the skill of the tuner.
- However -
With the 280s I made 30 ft/lbs greater torque than with the 272s, reached peak torque ~200rpm quicker, with no change in boost pressure. This is probably more reflective of the cam timing than the cams, but the point is I definitely didn't lose any torque by going to the 280s, so the notion that one loses torque with the 280s is baseless and is dependent upon tuning accuracy and other factors.
Despite the advanced cam timing with the 280s, I reached peak power at 6400 rpm, just as I did with the 272s set at -3/-3. The difference is I made 16whp more with the 280s, again with no change in boost pressure.
Note: This was all done with a Dyno Dynamics dyno, so tack on another 12-15% to those differences for Dynojet numbers.
I did however install a new IC at the same time as the HKS 280s, so maybe there is some difference there, but from what I've seen, most of the observed difference is due to the cams, the timing thereof, the capability of the tuning hardware, and the skill of the tuner.
Always a very informative post from Ted B
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From: Türkey/İstanbul
Dude ı have 264/272 combo and also have crower cam gears, crower springs and retainers.I like my setup and ı highly recommend to buy cam gears bacause when ı installed the cams without cam gear tune, idle is not stabil but after cam gear tune they are like stock without reflash
..
Tedb gained about 20whp when he added his 280's, but he also added a bunch of other parts if you check his thread. whos to say the 272's with +2/0 wouldn't make the same power with the mods he added. I know the nisei i/c's add about 13-18whp.
this is what he added:
JDM MR BOV
ARP Head Studs
Agency AL Crank Pulley
Greddy JDM Upper IC Pipe
Nisei IC
HKS 280 (+2/0)
Test Pipe
SS Autochrome Manifold + SwainTech Coating
Xede V3
this is what he added:
JDM MR BOV
ARP Head Studs
Agency AL Crank Pulley
Greddy JDM Upper IC Pipe
Nisei IC
HKS 280 (+2/0)
Test Pipe
SS Autochrome Manifold + SwainTech Coating
Xede V3
Last edited by nickracer9; Dec 17, 2005 at 11:45 AM.
Just doing some research as I am looking for cams and can't decide whether or not to get the HKS 272's or the 280s. I decided to place the HP curves over each other and see what the results are. Obviously the 280s alongside with meth and a whole other goodies would equal more horsepower but I just want to see the curve and HP changes.
I definately like the 280s as they show consistant gains throughout.
I definately like the 280s as they show consistant gains throughout.
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