Cam advice...
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Joined: Dec 2010
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From: PA
Cam advice... I currently have an xr275hr cam waiting to go in my 99z28. Should I have went with the larger xr281hr? I plan on running this cam with comp cams 1.82 high ratio rockers. I primarily drive the car on the street, it is at the dragstrip 3-4 times a summer. Mods I plan on doing with the cam: Fast 102mm intake and TB, CNC ported LS6 head with 5 angle valvejob and Dual springs, ARP rod bolts(for spinning around 7k rpm), Fast Fuel rails and bosch green giant injectors, and walbro fuel pump. Rear end is a 9" with 4.11 gears. Thanks in advance for your advice.
Eric
Eric
Thread Starter
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Joined: Dec 2010
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From: PA
XER273HR
http://www.compcams.com/Company/CC/c...csid=1092&sb=2
XR275HR
http://www.compcams.com/Company/CC/c...csid=1090&sb=2
XR281HR
http://www.compcams.com/Company/CC/c...csid=1091&sb=2
I really like the first one due to the fast it is nitrous and blower friendly
but what do you think? will it be to large of a cam with the 1.8 ratio rockers?
http://www.compcams.com/Company/CC/c...csid=1092&sb=2
XR275HR
http://www.compcams.com/Company/CC/c...csid=1090&sb=2
XR281HR
http://www.compcams.com/Company/CC/c...csid=1091&sb=2
I really like the first one due to the fast it is nitrous and blower friendly
but what do you think? will it be to large of a cam with the 1.8 ratio rockers? 
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
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just use your stock rockers,maybe upgrade the the trunnion bearings.if you can find a used 92mm fast you can use your stock fuel rail.get a 92mm TB if you get the 102mm intake.what converter will you use?
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Thread Starter
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From: PA
I have a 6-speed. The car is not a daily driver, but it does spend most of its time on the street, track 3-4 times a year. not sure which cam will benefit me the most. obviously looking for the most streetable HP. Thanks
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From: Texas/Afghanistan
eh i'de look at somebody else's cams. ie: TSP, TR, SI, vengeance, cam motion, etc. not really a fan of the comp house grinds.
but if you went with one of those i'de say the XE-R 224/230, even then i'de still look at a bigger cam for what you are doing.
but if you went with one of those i'de say the XE-R 224/230, even then i'de still look at a bigger cam for what you are doing.
Last edited by brian_rs/ss; Dec 12, 2010 at 06:24 PM.
Good advice right here. As far as the cams...
XER273HR
224/230 .581/.588 114 (That is .622/.630 lift with 1.82 rockers btw). "RPM range 2000 - 7000."
XR275HR
222/224 .566/.568 112 "RPM range 1800 - 6800"
XR281HR
228/230 .571/.573 112 "RPM range 2200 - 7200"
Where do you actually want to make power, and are you going to stay NA or go with a supercharger? I don't know that I would get any of these for a primarily street driven car.
XER273HR
224/230 .581/.588 114 (That is .622/.630 lift with 1.82 rockers btw). "RPM range 2000 - 7000."
XR275HR
222/224 .566/.568 112 "RPM range 1800 - 6800"
XR281HR
228/230 .571/.573 112 "RPM range 2200 - 7200"
Where do you actually want to make power, and are you going to stay NA or go with a supercharger? I don't know that I would get any of these for a primarily street driven car.
Not exactly what I meant. There are other cams out there with different lobes and specs that may make more power in the RPM range you see on a daily basis with more DCR, etc...
