Stock GSR cams or Skunk2 Stage 1s on a Turboed GSR???
09-07-2005, 10:50 PM
#1
Stock GSR cams or Skunk2 Stage 1s on a Turboed GSR???
from wat people told me i heard stock gsr cams will make more power on a turbo gsr than the skunks would...is that true or false because i have s2s1 cams, skunk2 cam gears, wicked manifold and a turbo kit and if the gsr cams work better than i guess i will switch em out...please let me know wat u guys think and if anyone has proven it to be a fact than i would really appreciate the info. Thanks
Modified by 98B18C1 at 1:24 AM 9/9/2005
Modified by 98B18C1 at 1:24 AM 9/9/2005
09-07-2005, 10:55 PM
#2
Senior Member
There are a lot of people making great power with GSR cams in turbo setups. I personally wouldn't use anything larger than CTR cams as it would be hard to cut out the overlap while still keeping good cam timing with larger profile cams.
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09-08-2005, 08:40 PM
#9
leave your gsr cams if anythign u can go with itr cams, but skunk2 stage 1 are too large u would blow the boost right out the tail pipe equaling less power, u will get more power with gsr or itr cams then skunk cams, i know cause i took my skunk2 stage 1 cams out when i went turbo on my gsr, and as stated above tehy are better for N/a applications
09-09-2005, 12:08 PM
#11
u know to be honest i haven't heard all that much about turbo cams, honestly your gsr cams will do just fine, not worth all the extra money but hey to each of there own, but if u do decide to get turbo cams invest in some springs and retainers to go with it
09-10-2005, 05:06 PM
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Re: (98B18C1)
your only supose to use stock cams or turbo cams for that kind of set up.....skunk2's would be good for n/a only...... 
09-10-2005, 07:52 PM
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Re: (gssr)
In theory GSR's would be better, and a lot of people use them with great success. There was a dyno where somebody tested GSR cams against I think some Jun 2 cams, and the JUN cams made significantly more power.
09-10-2005, 10:15 PM
#20
Senior Member
You have to look at the actual engineering viewpoint when delving into the technical aspect of this particular situation. In a boosted car lots of valve overlap will cause a reduction in dynamic compression do to compressed air leaking out of the exhuast valves. This means that long duration cams will be significantly less beneficial than will short duration cams. This does leave lots of room for high lift cams without tons of duration which will allow more air into the combustion chambers without creating any unnecessary valve overlap. Most boost specific profiles are ground to offer comparitively small amounts of overlap when compared to n/a specific profiles of similar lift. There are some n/a specific profiles that rely on lift as opposed to duration anyway and happen to work well, it's just a matter of researching profiles until you find a set (or combination) that works.
Valve overlap becomes more of a hindrance to a boosted car as the amount of boost increases. At low boost levels, something like CTR cams will give you enough lift to make good power, but will not give you so much overlap that it's hurting anything. At higher boost levels, GSR cams will help to further eliminate overlap while the added boost recovers any losses from the reduced amount of lift on the cams.
Also note that cam tuning will play a vital role as well, you can dial out overlap on almost any setup, but the opening and closing of the valves may not be optimal for the breathing characteristics of the motor. Again this is where GSR cams shine on high boost applications, they allow for a "close to ideal" opening and closing of the valves with relatively little stock overlap, thus allowing more room to further dial in the breathing characteristics of the motor.
Valve overlap becomes more of a hindrance to a boosted car as the amount of boost increases. At low boost levels, something like CTR cams will give you enough lift to make good power, but will not give you so much overlap that it's hurting anything. At higher boost levels, GSR cams will help to further eliminate overlap while the added boost recovers any losses from the reduced amount of lift on the cams.
Also note that cam tuning will play a vital role as well, you can dial out overlap on almost any setup, but the opening and closing of the valves may not be optimal for the breathing characteristics of the motor. Again this is where GSR cams shine on high boost applications, they allow for a "close to ideal" opening and closing of the valves with relatively little stock overlap, thus allowing more room to further dial in the breathing characteristics of the motor.
09-16-2005, 03:26 PM
#24
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some ppl use itr cams. pretty close to skunk2 stage 1....but i guess the answer lies within the tune. you can work the cams to bring more power....like maybe changing the vtec cross over point?